<SEC-DOCUMENT>0001104659-21-034986.txt : 20210311
<SEC-HEADER>0001104659-21-034986.hdr.sgml : 20210311
<ACCEPTANCE-DATETIME>20210311160142
ACCESSION NUMBER:		0001104659-21-034986
CONFORMED SUBMISSION TYPE:	POS AM
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210311
DATE AS OF CHANGE:		20210311

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SandRidge Mississippian Trust I
		CENTRAL INDEX KEY:			0001509228
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				276990649
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		POS AM
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-184561
		FILM NUMBER:		21733223

	BUSINESS ADDRESS:	
		STREET 1:		601 TRAVIS STREET, FLOOR 16
		STREET 2:		THE BANK OF NEW YORK MELLON TRUST CO. NA
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
		BUSINESS PHONE:		5122366555

	MAIL ADDRESS:	
		STREET 1:		601 TRAVIS STREET, FLOOR 16
		STREET 2:		THE BANK OF NEW YORK MELLON TRUST CO. NA
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SANDRIDGE ENERGY INC
		CENTRAL INDEX KEY:			0001349436
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				208084793
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		POS AM
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-184561-01
		FILM NUMBER:		21733224

	BUSINESS ADDRESS:	
		STREET 1:		123 ROBERT S. KERR AVENUE
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102-6406
		BUSINESS PHONE:		405-429-5500

	MAIL ADDRESS:	
		STREET 1:		123 ROBERT S. KERR AVENUE
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102-6406

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RIATA ENERGY INC
		DATE OF NAME CHANGE:	20060111
</SEC-HEADER>
<DOCUMENT>
<TYPE>POS AM
<SEQUENCE>1
<FILENAME>tm219395d1_posam.htm
<DESCRIPTION>POS AM
<TEXT>
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                           <P STYLE="text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="text-align: center; margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt"><B>As filed with the Securities and Exchange Commission on March 11, 2021</B></P>

<P STYLE="text-align: center; margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration Statement File No.&nbsp;333-184561&nbsp;</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Washington, D.C. 20549</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 5pt">&nbsp;</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>POST-EFFECTIVE AMENDMENT NO. 1</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TO</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM S-3 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>REGISTRATION STATEMENT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNDER THE SECURITIES ACT OF 1933 </B></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 14pt"><B>SANDRIDGE
    MISSISSIPPIAN TRUST I</B></FONT></TD>
    <TD STYLE="width: 50%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 14pt"><B>SANDRIDGE
    ENERGY, INC.</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Exact name of registrant as specified in its charter)</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Exact name of registrant as specified in its charter)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Delaware</B></FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Delaware</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(State or other jurisdiction of incorporation or organization)</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(State or other jurisdiction of incorporation or organization)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>27-6990649</B></FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white"><B>20-8084793</B></FONT></TD></TR>
<TR>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(I.R.S. Employer</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Identification Number)</P></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(I.R.S. Employer</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Identification Number)</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>601 Travis Street, 16th Floor,</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Houston, Texas 77002</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(512)&nbsp;236-6555</B></P></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>1 E. Sheridan
        Ave, Suite 500</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>Oklahoma City,&nbsp;Oklahoma
        73104</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="background-color: white"><B>(405)&nbsp;429-5500</B></FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Address, including zip code, and telephone number, including <BR>
area code, of registrant&#8217;s principal executive offices)</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Address, including zip code, and telephone number, including<BR>
 area code, of registrant&#8217;s principal executive offices)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Sarah Newell<BR>
        The Bank of New York Mellon Trust Company, N.A.,<BR>
 Trustee</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>601 Travis Street, 16th Floor,</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Houston, Texas 77002</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(512)&nbsp;236-6555</B></P></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>Salah Gamoudi<BR>
        Senior Vice President, Chief Financial Officer and Chief<BR>
 Accounting Officer<BR>
        1 E. Sheridan Ave, Suite 500</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>Oklahoma City,&nbsp;Oklahoma
        73104</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="background-color: white"><B>(405)&nbsp;429-5500</B></FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Name, address, including zip code, and telephone number,<BR>
 including area code, of agent for service)</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Name, address, including zip code, and telephone number,<BR>
 including area code, of agent for service)</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>Copies to:</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 33%; padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>Carl F. Giesler,
        Jr<BR>
        President and Chief Executive Officer </B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>SandRidge Energy,
        Inc.<BR>
        1 E. Sheridan Ave, Suite 500</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>Oklahoma City,&nbsp;Oklahoma
        73104</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="background-color: white"><B>(405)&nbsp;429-5500</B></FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white; width: 34%"><B>Michael J. Blankenship<BR>
    Winston &amp; Strawn LLP<BR>
    800 Capitol St., Suite 2400<BR>
    Houston, Texas 77002<BR>
    (713) 651-2600</B></TD>
    <TD STYLE="width: 33%; padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Troy L. Harder</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Bracewell LLP</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>711 Louisiana Street, Suite 2300</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Houston, Texas 77002</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(713) 221-1456</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Approximate date of commencement of proposed
sale to the public:</B> Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif">If&nbsp;the&nbsp;only&nbsp;securities&nbsp;being&nbsp;registered&nbsp;on&nbsp;this&nbsp;Form&nbsp;are&nbsp;being&nbsp;offered&nbsp;pursuant&nbsp;to&nbsp;dividend&nbsp;or&nbsp;interest&nbsp;reinvestment&nbsp;plans,&nbsp;please&nbsp;check&nbsp;the&nbsp;following&nbsp;box:&nbsp;</FONT><FONT STYLE="font-family: Wingdings">&#168;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">If any of the securities being registered
on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 of the Securities Act of 1933, other than
securities offered only in connection with dividend or interest reinvestment plans, check the&nbsp;following&nbsp;box:&nbsp;<FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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. <FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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. <FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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. <FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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. <FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth
company. See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated filer,&#8221; &#8220;smaller reporting
company&#8221; and &#8220;emerging growth company&#8221; in Rule&nbsp;12b-2 of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<TR>
    <TD STYLE="vertical-align: top; width: 37%"><FONT STYLE="font-size: 10pt">Large accelerated filer &nbsp;<FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 24%; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 33%; text-align: right"><FONT STYLE="font-size: 10pt">Accelerated filer <FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 3%">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: top; width: 1%; text-align: right">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">Non-accelerated filer <FONT STYLE="font-family: Times New Roman, Times, Serif"><FONT STYLE="font-family: Wingdings">&#120;</FONT></FONT></FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font-size: 10pt">Smaller&nbsp;reporting&nbsp;company&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</FONT></FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: top; text-align: right">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-indent: 4.5pt">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right; text-indent: 4.5pt"><FONT STYLE="font-size: 10pt">Emerging growth&nbsp;company&nbsp;<FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: top; text-align: right">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">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 7(a)(2)(B) of Securities Act. </FONT><FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in; color: red">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">EXPLANATORY
NOTE</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in"><B>DEREGISTRATION OF UNSOLD
SECURITIES</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">This Post-Effective Amendment
No. 1 (this &#8220;Post-Effective Amendment&#8221;) relates to the Registration Statement on Form S-3 (File No. 333-184561) (the
&#8220;Registration Statement&#8221;) of SandRidge Mississippian Trust I, a Delaware statutory trust (the &#8220;Trust&#8221;),
and SandRidge Energy, Inc., a Delaware corporation (&#8220;SandRidge&#8221;, and together with the Trust, the &#8220;Registrants&#8221;),
previously filed with the Securities and Exchange Commission on October 23, 2012, registering <FONT STYLE="font-family: Times New Roman, Times, Serif; background-color: white">528,063
Common Units representing Beneficial Interests in the Trust</FONT>.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">The Registrants have agreed
to terminate the offering of the securities pursuant to the Registration Statement. The Registrants, by filing this Post-Effective
Amendment, hereby terminate the effectiveness of the Registration Statement and remove from registration any and all securities
registered but unsold under the Registration Statement as of the date hereof. This filing is made in accordance with an undertaking
made by the Registrants in the Registration Statement to remove from registration by means of a post-effective amendment any securities
that had been registered but remain unsold at the termination of the offering.</P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">SIGNATURES</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">Pursuant to the requirements
of the Securities Act of 1933, as amended, 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 Post-Effective Amendment to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City of Austin, State of Texas, on March 11, 2021.</P>

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    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 50%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt"><B>SANDRIDGE MISSISSIPPIAN TRUST I</B></TD></TR>
</TABLE>


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    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 50%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 3%">By:</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt">The Bank of New York Mellon Trust Company, N.A., as Trustee</TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 171pt; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" BORDER="0" STYLE="width: 100%; margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">
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    <TD STYLE="padding-bottom: 1pt; padding-left: 10pt; text-indent: -10pt; width: 50%">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; width: 3%">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; padding-left: 10pt; text-indent: -10pt; width: 3%">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding-left: 10pt; text-indent: -10pt">/s/ Sarah Newell</TD></TR>
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    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 5%">Name:</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt">Sarah Newell</TD></TR>
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    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 5%">Title:</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt">Vice President</TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In reliance upon Rule 478 under the Securities
Act of 1933, as amended, no other person is required to sign this Post-Effective Amendment.</P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">SIGNATURES</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">Pursuant to the requirements
of the Securities Act of 1933, as amended, 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 Post-Effective Amendment to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City of Oklahoma City, State of Oklahoma, on March 11,
2021.</P>

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    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 50%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt"><B>SANDRIDGE ENERGY, INC.</B></TD></TR>
</TABLE>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 171pt; text-indent: 0.5in">&nbsp;</P>

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    <TD STYLE="padding-bottom: 1pt; padding-left: 10pt; text-indent: -10pt; width: 3%">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding-left: 10pt; text-indent: -10pt">/s/&nbsp;&nbsp;Salah Gamoudi</TD></TR>
</TABLE>


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    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 50%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 5%">Name:</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt"> Salah Gamoudi</TD></TR>
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    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 50%">&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; text-indent: -10pt; width: 5%">Title:</TD>
    <TD>Senior Vice President, Chief Financial Officer and Chief Accounting Officer</TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In reliance upon Rule 478 under the Securities
Act of 1933, as amended, no other person is required to sign this Post-Effective Amendment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P>

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