<SEC-DOCUMENT>0001654954-17-006065.txt : 20170630
<SEC-HEADER>0001654954-17-006065.hdr.sgml : 20170630
<ACCEPTANCE-DATETIME>20170630173106
ACCESSION NUMBER:		0001654954-17-006065
CONFORMED SUBMISSION TYPE:	S-3/A
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20170630
DATE AS OF CHANGE:		20170630

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Bridgeline Digital, Inc.
		CENTRAL INDEX KEY:			0001378590
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				522263942
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		S-3/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-218116
		FILM NUMBER:		17943249

	BUSINESS ADDRESS:	
		STREET 1:		80 BLANCHARD ROAD
		CITY:			BURLINGTON
		STATE:			MA
		ZIP:			01803
		BUSINESS PHONE:		781 376 5555

	MAIL ADDRESS:	
		STREET 1:		80 BLANCHARD ROAD
		CITY:			BURLINGTON
		STATE:			MA
		ZIP:			01803

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Bridgeline Software, Inc.
		DATE OF NAME CHANGE:	20061018
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3/A
<SEQUENCE>1
<FILENAME>blins3a_june2017.htm
<DESCRIPTION>AMENDMENT NO. 1 TO FORM S-3
<TEXT>
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As filed with the Securities and Exchange Commission on June 30,
2017</font></div>
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Registration No. 333-218116</font></div>
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UNITED STATES</font></div>
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SECURITIES AND EXCHANGE COMMISSION</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Washington, D.C. 20549</font></div>
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FORM S-3/A</font></div>
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(Amendment No. 1)</font></div>
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REGISTRATION STATEMENT</font></div>
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UNDER</font></div>
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THE SECURITIES ACT OF 1933</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 32px">
BRIDGELINE DIGITAL, INC.</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;(Exact Name of Registrant as Specified in Its
Charter)</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<font style="text-decoration: underline;"><font style="font-weight: bold; font-family: Times New Roman; font-size: 13px;">
Delaware</font></font></div>
</td>
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<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
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<font style="text-decoration: underline;"><font style="font-weight: bold; font-family: Times New Roman; font-size: 13px;">
52-2263942</font></font></div>
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</tr><tr>
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<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px;">
(State or Other Jurisdiction of</font></div>
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<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px;">
Incorporation or Organization)</font></div>
</td>
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<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
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<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px;">
(I.R.S. Employer</font></div>
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<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px;">
Identification Number)</font></div>
</td>
</tr></table>
</div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
80 Blanchard Road</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Burlington, MA 01803</font></div>
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<font style="text-decoration: underline; color: #000000; font-weight: bold; font-family: Times New Roman; font-size: 13px">
(781) 376-5555</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;(Address, Including Zip Code, and Telephone Number, Including
Area Code, of Registrant&#x2019;s Principal Executive
Offices)</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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&#xA0;</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Michael D. Prinn</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Chief Financial Officer</font></div>
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<font style="color: #000000; font-weight: bold; font-family: Times New Roman; font-size: 13px">
Bridgeline Digital, Inc.</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
80 Blanchard Road</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Burlington, MA 01803</font></div>
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<font style="text-decoration: underline; color: #000000; font-weight: bold; font-family: Times New Roman; font-size: 13px">
(781) 376-5555</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;(Name, Address, Including Zip Code, and Telephone Number,
Including Area Code, of Agent for Service)</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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Copies to</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Daniel W. Rumsey, Esq.</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Jessica R. Sudweeks, Esq.</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Disclosure Law Group, a Professional Corporation</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
600 West Broadway, Suite 700</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
San Diego, CA 92101</font></div>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
(619) 272-7050</font></div>
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<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
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<font style="font-family: Times New Roman; font-size: 13px"><font style="font-weight: bold; color: #000000">Approximate date of
commencement of proposed sale to the public</font><font style="color: #000000">:&#xA0;From time to time after this registration
statement becomes effective, as determined by market conditions and
other factors.</font></font></div>
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<font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">If the only securities being registered on this
form are being offered pursuant to dividend or interest
reinvestment plans, please check the following
box.&#xA0;&#xA0;</font><font style="color: #000000">&#x2610;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">If any of the securities being registered on this
form are to be offered on a delayed or continuous basis pursuant to
Rule 415 under the Securities Act of 1933, other than securities
offered only in connection with dividend or interest reinvestment
plans, check the following box.&#xA0;</font> <font style="color: #000000">&#x2612;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">If this form is filed to register additional
securities for an offering pursuant to Rule 462(b) under the
Securities Act, please check the following box and list the
Securities Act registration statement number of the earlier
effective registration statement for the same
offering.&#xA0;&#xA0;</font><font style="color: #000000">&#x2610;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">If this form is a post-effective amendment filed
pursuant to Rule 462(c) under the Securities Act, check the
following box and list the Securities Act registration statement
number of the earlier effective registration statement for the same
offering.&#xA0;&#xA0;</font><font style="color: #000000">&#x2610;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">If this form is a registration statement pursuant
to General Instruction I.D. or a post-effective amendment thereto
that shall become effective upon filing with the Commission
pursuant to Rule 462(e) under the Securities Act, check the
following box.&#xA0;&#xA0;</font><font style="color: #000000">&#x2610;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">If this form is a post-effective amendment to a
registration statement filed pursuant to General Instruction I.D.
filed to register additional securities or additional classes of
securities pursuant to Rule 413(b) under the Securities Act, check
the following box.&#xA0;&#xA0;</font><font style="color: #000000">&#x2610;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 36px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">Indicate
by check mark whether the registrant is a large accelerated filer,
an accelerated filer, a non-accelerated filer, or a smaller
reporting company. See the definitions of &#x201C;large accelerated
filer,&#x201D; &#x201C;accelerated filer&#x201D; &#x201C;smaller
reporting company,&#x201D; and &#x201C;emerging growth company&#x201D;
in Rule 12b-2 of the Exchange Act. (Check one):</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="margin-left: 36px;">
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr>
<td style="vertical-align: bottom; width: 43%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Large&#xA0;accelerated&#xA0;filer</font></div>
</td>
<td style="vertical-align: bottom; width: 1%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 5%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-size: 13px">&#x2610;</font></div>
</td>
<td style="vertical-align: bottom; width: 2%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 44%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Accelerated
filer</font></div>
</td>
<td style="vertical-align: bottom; width: 1%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 3%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-size: 13px">&#x2610;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 43%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Non-accelerated
filer</font></div>
</td>
<td style="vertical-align: bottom; width: 1%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 5%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="">
&#x2610;</font>&#xA0;&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 2%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 44%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Smaller&#xA0;reporting&#xA0;company</font></div>
</td>
<td style="vertical-align: bottom; width: 1%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 3%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-size: 13px">&#x2611;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 43%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 1%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 2%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 44%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Emerging
growth company</font></div>
</td>
<td style="vertical-align: bottom; width: 1%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 3%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-size: 13px">&#x2610;</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">If
an emerging growth company, indicate by check mark if the
registrant has elected not to use the extended transition period
for complying with any new or revised financial accounting
standards provided pursuant to Section 13(a) of the Exchange Act.
[&#xA0; ]</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
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<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px">
Explanatory Note</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="font-family: Times New Roman; font-size: 10"><font style="font-family: Times New Roman; font-size: 13px"><font style="font-size: 13px">Bridgeline Digital, Inc. is hereby filing this
Pre-Effective Amendment No. 1 to the Registration Statement on Form
S-3 (Registration No. 333-218116), originally filed on May 19, 2017
(the &#x201C;</font><font style="font-style: italic; font-size: 13px">Registration
Statement</font><font style="font-size: 13px">&#x201D;), as an
exhibit-only filing to file an opinion of Disclosure Law Group, a
Professional Corporation, filed herewith as Exhibit 5.1 (the
&#x201C;</font><font style="font-style: italic; font-size: 13px">Opinion</font><font style="font-size: 13px">&#x201D;), as well as an updated consent from
Marcum LLP, the Company's independent registered public accounting
firm (together with the Opinion, the "</font><font style="font-style: italic; font-size: 13px">Exhibits</font><font style="font-size: 13px">").</font> <font style="font-size: 13px">Accordingly, this Pre-Effective Amendment No. 1
consists only of the facing page, this explanatory note, Item 16 of
Part II of the Registration Statement, the signature page to the
Registration Statement, and the Exhibits filed herewith as Exhibits
5.1 and 23.1, respectively. The prospectus and the balance of Part
II of the Registration Statement are unchanged and have been
omitted.</font></font></font></div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
<div id="pgbrk" style="width: 100%; margin-left: 0px; text-indent: 0px; margin-right: 0px">
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<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<div id="hdr">
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div><font style="font-family: Times New Roman; font-size: 10">&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px">
PART II</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px">
INFORMATION NOT REQUIRED IN PROSPECTUS</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
ITEM 16. &#xA0;EXHIBITS</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr style="background-color: rgb(204, 238, 255);">
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
1.1*</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Form of Underwriting Agreement</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
1.2*</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Form of
Placement Agent Agreement</font></div>
</td>
</tr><tr style="background-color: rgb(204, 238, 255);">
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
4.1*</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Form of any certificate of designation with respect to any
preferred stock issued hereunder and the related form of preferred
stock certificate</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
4.2*</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Form of any warrant agreement with respect to each particular
series of warrants issued hereunder</font></div>
</td>
</tr><tr style="background-color: rgb(204, 238, 255);">
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
4.3*</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Form of any unit agreement with respect to any unit issued
hereunder</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
5.1+</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Opinion of Disclosure Law Group, a Professional
Corporation</font></div>
</td>
</tr><tr style="background-color: rgb(204, 238, 255);">
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
12.1*</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Computation of Ratio of Earnings to Fixed Charges</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
23.1+</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Consent of Independent Registered Public Accounting Firm
&#x2013;&#xA0;Marcum LLP</font></div>
</td>
</tr><tr style="background-color: rgb(204, 238, 255);">
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
23.2+</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Consent of Disclosure Law Group, a Professional Corporation
(included as part of Exhibit 5.1)</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 12%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
24</font></div>
</td>
<td style="vertical-align: bottom; width: 88%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Power of Attorney (included on signature page of the Registration
Statement on Form S-3, filed May 19, 2017)</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="display: table;">
<div style="display: table-row;">
<div style="display: table-cell; width: 24px;"><font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
*</font></div>
<div style="text-align: justify; display: table-cell; margin-left: 0px; text-indent: 0px; margin-right: 0px;"><font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
</font> <font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
To be filed, if necessary, subsequent to the effectiveness of this
registration by an amendment to this registration statement or
incorporation by reference pursuant to a Current Report on Form 8-K
in connection with an offering of securities.</font></div>
</div>
</div>
<div style="display: table;">
<div style="display: table-row;">
<div style="display: table-cell; width: 24px;"><font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
+</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; display: table-cell; margin-left: 0px; text-indent: 0px; margin-right: 0px;"><font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
</font> <font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
Filed herewith</font></div>
</div>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div id="pgbrk" style="width: 100%; margin-left: 0px; text-indent: 0px; margin-right: 0px">
<div id="ftr">
<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
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<div id="hdr">
<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div><font style="font-family: Times New Roman; font-size: 10">&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
SIGNATURES</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">Pursuant
to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused
this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Burlington,
Massachusetts on June 30, 2017.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr>
<td style="vertical-align: top; width: 49%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td colspan="2" style="vertical-align: top; width: 51%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-family: Times New Roman; font-size: 13px">
BRIDGELINE DIGITAL, INC.</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 49%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 47%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 49%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">By:</font></div>
</td>
<td style="vertical-align: top; width: 47%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="text-decoration: underline"><font style="font-family: Times New Roman; font-size: 13px">/s/ Roger
Kahn</font></font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 49%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 47%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Roger
Kahn</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 49%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 47%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
President and Chief Executive Officer</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
(Principal Executive Officer)&#xA0;</font></div>
</td>
</tr></table>
</div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
POWER OF ATTORNEY</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">Pursuant
to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in
the capacities and on the dates indicated.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr>
<td style="vertical-align: top; width: 29%; border-bottom: 1px solid rgb(0, 0, 0);">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Signature</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%; border-bottom: 1px solid rgb(0, 0, 0);">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Title</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%; border-bottom: 1px solid rgb(0, 0, 0);">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Date</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 29%;"><font style="text-decoration: underline">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px; text-decoration: underline;">
/s/ *</font></div>
</font></td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="color: rgb(0, 0, 0); font-family: Times New Roman; font-size: 13px;">
President and Chief Executive Officer</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">June
30, 2017</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">&#xA0;Roger
Kahn</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">(Principal
Executive Officer)&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 29%;"><font style="text-decoration: underline">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px; text-decoration: underline;">
/s/ *</font></div>
</font></td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Executive
Vice-President and</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">June
30, 2017</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Michael
Prinn</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Chief
Financial Officer</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">(Principal
Financial Officer)</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 29%;"><font style="text-decoration: underline">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px; text-decoration: underline;">
/s/&#xA0;*</font></div>
</font></td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Director</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">June
30, 2017</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Kenneth
Galaznik</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr>
<td style="vertical-align: top; width: 29%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 29%;"><font style="text-decoration: underline">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px; text-decoration: underline;">
/s/&#xA0;*</font></div>
</font></td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Director</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">June
30, 2017</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Joni
Kahn</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 29%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="text-decoration: underline"><font style="font-family: Times New Roman; font-size: 13px;"><font style="color: rgb(0, 0, 0); text-decoration: underline;">&#xA0;</font>/s/&#xA0;*</font></font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Director</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">June
30, 2017</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Scott
Landers</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: bottom; width: 29%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="text-decoration: underline"><font style="font-family: Times New Roman; font-size: 13px;"><font style="color: rgb(0, 0, 0); text-decoration: underline;">&#xA0;</font>/s/&#xA0;*</font></font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: bottom; width: 30%">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">Director</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">June
30, 2017</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Michael
Taglich</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 29%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 5%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: middle; width: 30%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr>
<td style="vertical-align: top; width: 7%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">*
By</font></div>
</td>
<td style="vertical-align: bottom; width: 93%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="text-decoration: underline;"><font style="font-family: Times New Roman; font-size: 13px;">/s/ Roger
Kahn</font></font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 7%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 93%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">Roger
Kahn, Attorney-in-Fact</font></div>
</td>
</tr><tr>
<td style="vertical-align: top; width: 7%;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 93%;">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px;">
<font style="font-family: Times New Roman; font-size: 13px;">June
30, 2017</font></div>
</td>
</tr></table>
</div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 1px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<div id="ftr">
<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>ex5-1.htm
<DESCRIPTION>OPINION ON LEGALITY
<TEXT>
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<title>Blueprint</title>
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<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Exhibit 5.1</font></div>
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&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
<img src="ex5-1000.jpg">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
June 30, 2017</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Bridgeline Digital, Inc.</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
80 Blanchard Road</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Burlington, MA 01803</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; color: #000000; font-family: Times New Roman; font-size: 13px">
Re:&#xA0;&#xA0;&#xA0;&#xA0;Registration Statement on Form
S-3</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
Ladies and Gentlemen:</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">We are acting as counsel for Bridgeline Digital,
Inc., a Delaware corporation (the &#x201C;</font><font style="font-style: italic; color: #000000">Company</font><font style="color: #000000">&#x201D;), in connection with the filing on the
date hereof of Amendment No. 1 to a Registration Statement
on&#xA0;Form&#xA0;S-3&#xA0;relating to the registration under the
Securities Act of 1933 (the &#x201C;</font><font style="font-style: italic; color: #000000">Act</font><font style="color: #000000">&#x201D;) of&#xA0;the following securities of the
Company having an aggregate public offering price of up to
$10,000,000: (i)&#xA0;shares (the &#x201C;</font><font style="font-style: italic; color: #000000">Shares</font><font style="color: #000000">&#x201D;) of common stock, par value
$0.001&#xA0;per share (&#x201C;</font><font style="font-style: italic; color: #000000">Common
Stock</font><font style="color: #000000">&#x201D;), (ii)&#xA0;shares
of preferred stock, par value $0.001 per share
(&#x201C;</font><font style="font-style: italic; color: #000000">Preferred
Stock</font><font style="color: #000000">&#x201D;), in one or more
series, (iii)&#xA0;warrants to purchase Common Stock or Preferred
Stock or any combination thereof (&#x201C;</font><font style="font-style: italic; color: #000000">Warrants</font><font style="color: #000000">&#x201D;), and (iv) units consisting of one or more
shares of common stock, shares of preferred stock, warrants or any
combination of such securities (as defined below)
(&#x201C;</font><font style="font-style: italic; color: #000000">Units</font><font style="color: #000000">&#x201D;). The Shares, Preferred Stock, Warrants
and Units are collectively referred to herein as the
&#x201C;</font><font style="font-style: italic; color: #000000">Securities</font><font style="color: #000000">.&#x201D; The Securities shall include any
additional amounts of such securities the offer and sale of which
are registered pursuant to a registration statement filed pursuant
to Rule 462(b) under the Act in connection with one or more
offerings contemplated by such Registration Statement. Such
Registration Statement, as amended, and including any registration
statement related thereto and filed pursuant to Rule&#xA0;462(b)
under the Act, is herein referred to as the
&#x201C;</font><font style="font-style: italic; color: #000000">Registration
Statement</font><font style="color: #000000">.&#x201D;</font></font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">The Securities may be offered and sold from time
to time by the Company as set forth in the Registration Statement,
the prospectus contained within the Registration Statement (the
&#x201C;</font><font style="font-style: italic; color: #000000">Prospectus</font><font style="color: #000000">&#x201D;), and supplements to the Prospectus (each,
a &#x201C;</font><font style="font-style: italic; color: #000000">Prospectus
Supplement</font><font style="color: #000000">&#x201D;). The
Warrants may be issued under one or more warrant agreements (each,
a &#x201C;</font><font style="font-style: italic; color: #000000">Warrant
Agreement</font><font style="color: #000000">&#x201D;) by and
between the Company and a bank or trust company to be identified
therein as warrant agent. The Units may be issued under one or more
unit agreements (each, a &#x201C;</font><font style="font-style: italic; color: #000000">Unit
Agreement</font><font style="color: #000000">&#x201D;) between the
Company and a third party to be identified therein as unit agent.
Each Warrant Agreement and each Unit Agreement are herein
collectively called the &#x201C;</font><font style="font-style: italic; color: #000000">Agreements</font><font style="color: #000000">.&#x201D;</font></font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">We
have reviewed the Registration Statement and such other agreements,
documents, records, certificates and other materials, and have
reviewed and are familiar with such corporate proceedings and
satisfied ourselves as to such other matters, as we have considered
relevant or necessary as a basis for this opinion. In such review,
we have assumed the accuracy and completeness of all agreements,
documents, records, certificates and other materials submitted to
us, the conformity with the originals of all such materials
submitted to us as copies (whether or not certified and including
facsimiles), the authenticity of the originals of such materials
and all materials submitted to us as originals, the genuineness of
all signatures and the legal capacity of all natural
persons.</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">On
the basis of the assumptions and subject to the qualifications and
limitations set forth herein, we are of the opinion
that:</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr style="background-color: #ffffff">
<td style="vertical-align: top; width: 2%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
1.</font></div>
</td>
<td style="vertical-align: top; width: 94%">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; background-color: #FFFFFF; font-family: Times New Roman; font-size: 13px">
When an issuance of the Shares has been duly authorized by all
necessary corporate action of the Company, upon issuance, delivery
and payment therefor in an amount not less than the par value
thereof in the manner contemplated by the Registration Statement
and/or the Prospectus and related Prospectus Supplement(s) and by
such corporate action, such Shares will be validly issued, fully
paid and nonassessable.</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr style="background-color: #ffffff">
<td style="vertical-align: middle; width: 2%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
2.</font></div>
</td>
<td style="vertical-align: top; width: 94%">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000; background-color: #FFFFFF">
When a series of Preferred Stock has been duly established in
accordance with the terms of the Company&#x2019;s Amended and
Restated Certificate of Incorporation, as amended (the
&#x201C;</font><font style="font-style: italic; color: #000000; background-color: #FFFFFF">Certificate
of Incorporation</font><font style="color: #000000; background-color: #FFFFFF">&#x201D;) and authorized
by all necessary corporate action of the Company, and upon
issuance, delivery and payment therefor in the manner contemplated
by the Registration Statement and/or the Prospectus and related
Prospectus Supplement(s) and by such corporate action, such shares
of such series of Preferred Stock will be validly issued, fully
paid and nonassessable.</font></font></div>
</td>
</tr></table>
</div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<div id="ftr">
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr style="background-color: #ffffff">
<td style="vertical-align: middle; width: 2%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
3.</font></div>
</td>
<td style="vertical-align: top; width: 94%">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; background-color: #FFFFFF; font-family: Times New Roman; font-size: 13px">
When a Warrant Agreement has been duly authorized by all necessary
corporate action of the Company and duly executed and delivered,
and when the specific terms of a particular issuance of Warrants
have been duly established in accordance with such Warrant
Agreement and authorized by all necessary corporate action of the
Company, and the Warrants have been duly executed, authenticated,
issued and delivered against payment therefor in accordance with
such Warrant Agreement and in the manner contemplated by the
Registration Statement and/or the Prospectus and related Prospectus
Supplement(s) and by such corporate action (assuming the securities
issuable upon exercise of the Warrants have been duly authorized
and reserved for issuance by all necessary corporate action), the
Warrants will be legally valid and binding obligations of the
Company, enforceable against the Company in accordance with their
terms.</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div>
<table cellpadding="0" cellspacing="0" style="width: 100%; font-family: Times New Roman; font-size: 13px">
<tr style="background-color: #ffffff">
<td style="vertical-align: middle; width: 2%">
<div><font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</td>
<td style="vertical-align: top; width: 4%">
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
4.</font></div>
</td>
<td style="vertical-align: top; width: 94%">
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; background-color: #FFFFFF; font-family: Times New Roman; font-size: 13px">
When a Unit Agreement has been duly authorized by all necessary
corporate action of the Company and duly executed and delivered,
and when the specific terms of a particular issuance of Units have
been duly established in accordance with such Unit Agreement and
authorized by all necessary corporate action of the Company, and
the Units have been duly executed, authenticated, issued and
delivered against payment therefor in accordance with such Unit
Agreement and in the manner contemplated by the Registration
Statement and/or the Prospectus and related Prospectus
Supplement(s) and by such corporate action (assuming the
constituent securities of the Units have been duly authorized and
reserved for issuance by all necessary corporate action), the Units
will be legally valid and binding obligations of the Company,
enforceable against the Company in accordance with their
terms.</font></div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">
&#xA0;</font><font style="color: #000000; font-size: 13px">&#xA0;</font><font style="color: #000000">&#xA0;</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">Our
opinions set forth above are subject to and limited by the effect
of (a)&#xA0;applicable bankruptcy, insolvency, fraudulent
conveyance, fraudulent transfer, receivership, conservatorship,
arrangement, moratorium and other laws affecting and relating to
the rights of creditors generally, (b)&#xA0;general equitable
principles and (c)&#xA0;general principles of equity, including
without limitation concepts of materiality, reasonableness, good
faith and fair dealing, and the possible unavailability of specific
performance or injunctive relief and limitation of rights of
acceleration, regardless of whether such enforceability is
considered in a proceeding in equity or at law.</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="font-family: Times New Roman; font-size: 13px"><font style="color: #000000">In connection with the opinions expressed above,
we have assumed that at or prior to the time of the delivery of any
of the Securities (a)&#xA0;the Registration Statement, and any
amendments thereto (including post-effective amendments), will have
been declared effective under the Act and a Prospectus Supplement
relating to the offer and sale of such Securities to the Prospectus
will have been prepared and filed with the Securities and Exchange
Commission pursuant to Rule 424(b) under the Act, (b)&#xA0;in the
case of the issuance of the Shares or the Preferred Stock, the
Company will have a sufficient number of authorized but unissued
shares thereof under the Certificate of Incorporation at the time
of such issuance, (c)&#xA0;the Board shall not have rescinded or
otherwise modified the authorization of such Securities, (d) that a
definitive purchase, underwriting or similar agreement, including
any Agreements, with respect to any Securities offered will have
been duly authorized and validly executed and delivered by the
Company and the other parties thereto and (e) that any Securities
issuable upon conversion, exchange, redemption or exercise of any
Securities being offered will be duly authorized, created and, if
appropriate, reserved for issuance upon such conversion, exchange,
redemption or exercise (f)&#xA0;neither the establishment of any
terms of such Securities after the date hereof nor the issuance and
delivery of, or the performance of the Company&#x2019;s obligations
under, such Securities will require any authorization, consent,
approval or license of or exemption from, or registration or filing
with, or report or notice to, any governmental unit, agency,
commission, department or other authority (a
&#x201C;</font><font style="font-style: italic; color: #000000">Governmental
Approval</font><font style="color: #000000">&#x201D;) or violate or
conflict with, result in a breach of, or constitute a default
under, (i)&#xA0;any agreement or instrument to which the Company or
any of its affiliates is a party or by which the Company or any of
its affiliates or any of their respective properties may be bound,
(ii)&#xA0;any Governmental Approval that may be applicable to the
Company or any of its affiliates or any of their respective
properties, (iii)&#xA0;any order, decision, judgment or decree that
may be applicable to the Company or any of its affiliates or any of
their respective properties or (iv)&#xA0;any applicable law (other
than the federal laws of the United States of America and the
General Corporation Law of the State of Delaware, in each case as
in effect on the date hereof).</font></font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div id="pgbrk" style="width: 100%; margin-left: 0px; text-indent: 0px; margin-right: 0px">
<div id="ftr">
<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
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<div id="hdr">
<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
</div>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">The
opinions set forth in this letter are limited to the federal laws
of the United States of America and the General Corporation Law of
the State of Delaware, in each case as in effect on the date
hereof.</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">We
hereby consent to the filing of this opinion letter as
Exhibit&#xA0;5.1 to the Registration Statement and to the use of
our name under the caption &#x201C;Legal Matters&#x201D; in the
Registration Statement and in the Prospectus forming a part thereof
and any supplement thereto. In giving this consent, we do not
thereby admit that we are within the category of persons whose
consent is required under Section&#xA0;7 of the Act or the rules
and regulations of the Commission promulgated
thereunder.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">Very
truly yours,</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="text-decoration: underline; color: #000000; font-family: Times New Roman; font-size: 13px">
/s/ Disclosure Law Group</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 48px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">Disclosure
Law Group, a Professional Corporation</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Times New Roman; font-size: 13px">
&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<div id="ftr">
<div style="text-align: left; width: 100%; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>ex23-1.htm
<DESCRIPTION>CONSENTS OF EXPERTS AND COUNSEL
<TEXT>
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Exhibit 23.1</font></div>
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INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM&#x2019;S
CONSENT</font></div>
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We consent to the incorporation by reference in this Registration
Statement of Bridgeline Digital, Inc. on Form S-3/A Amendment #1 of
our report dated December 16, 2016, with respect to our audits of
the consolidated financial statements of Bridgeline Digital, Inc.
as of September 30, 2016 and 2015 and for the years then ended
appearing in the Annual Report on Form 10-K of Bridgeline Digital,
Inc. for the year ended September 30, 2016. We also consent to the
reference to our firm under the heading &#x201C;Experts&#x201D; in
the Prospectus, which is part of this Registration
Statement.</font></div>
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/s/ Marcum&#xA0;</font><font style="font-variant: small-caps; color: #000000">llp</font></font></div>
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Marcum&#xA0;</font><font style="font-variant: small-caps; color: #000000">llp</font></font></div>
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Boston, Massachusetts</font></div>
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June 30, 2017</font></div>
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