<SEC-DOCUMENT>0001567619-22-004848.txt : 20220217
<SEC-HEADER>0001567619-22-004848.hdr.sgml : 20220217
<ACCEPTANCE-DATETIME>20220217154344
ACCESSION NUMBER:		0001567619-22-004848
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20220216
FILED AS OF DATE:		20220217
DATE AS OF CHANGE:		20220217

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Guinee Patrick J.
		CENTRAL INDEX KEY:			0001600919

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10436
		FILM NUMBER:		22647868

	MAIL ADDRESS:	
		STREET 1:		415 HOLIDAY DRIVE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15220

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FOSTER L B CO
		CENTRAL INDEX KEY:			0000352825
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-METALS SERVICE CENTERS & OFFICES [5051]
		IRS NUMBER:				251324733
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		415 HOLIDAY DR
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15220
		BUSINESS PHONE:		4129283431

	MAIL ADDRESS:	
		STREET 1:		415 HOLIDAY DR
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15220
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-02-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000352825</issuerCik>
        <issuerName>FOSTER L B CO</issuerName>
        <issuerTradingSymbol>FSTR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001600919</rptOwnerCik>
            <rptOwnerName>Guinee Patrick J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 HOLIDAY DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PITTSBURGH</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>15220</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP General Counsel &amp; Sec.</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-02-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1310</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>41384</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-02-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>631</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.05</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>40753</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents performance share units which were contingent rights to receive shares of common stock based on the Issuer's performance against certain pre-established financial metrics for the 2019-2021 performance period.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Patrick J. Guinee by Judith Balog, attorney-in-fact</signatureName>
        <signatureDate>2022-02-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa_guinee.htm
<DESCRIPTION>LIMITED POWER OF ATTORNEY
<TEXT>
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  <div>
    <div><br>
    </div>
    <div>&#160;</div>
    <div style="text-align: center; color: #000000; font-size: 12pt; font-weight: bold;"><u>LIMITED POWER OF ATTORNEY</u></div>
    <div>&#160;</div>
    <div style="text-align: justify; text-indent: 36pt; color: #000000; font-size: 12pt;">The undersigned, Patrick J. Guinee, does hereby nominate, constitute and appoint as his true and lawful attorneys-in-fact and agents with authority limited to and as
      specifically set forth herein, Patrick Guinee, Alex DelVecchio, and Judith Balog (each hereinafter referred to as an "Attorney-in-Fact").</div>
    <div>&#160;</div>
    <div style="text-align: justify; text-indent: 36pt; color: #000000; font-size: 12pt;">Each Attorney-in-Fact hereunder shall have the authority to: act, sign, execute and deliver for and on behalf of and in the place and stead of the undersigned, in the
      undersigned's capacity as a director and/or officer of L.B<font style="font-size: 10pt; font-weight: bold;">. </font>Foster Company, a Pennsylvania corporation (the "Company"), the Forms 3, 4 and 5 documents pursuant to and in accordance with
      Section 16 of the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the "Exchange Act"); to do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and
      execute any such Form 3, 4, or 5 and file such form with the U.S. Securities and Exchange Commission and any stock exchange or similar authority; and to take any other action of any type whatsoever in connection with the foregoing which, in the
      opinion of such Attorney-in-Fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents, executed by such Attorney-in-Fact on behalf of the undersigned pursuant to this Limited
      Power of Attorney shall be in such form and shall contain such terms and conditions as such Attorney-in-Fact may approve in such Attorney-in-Fact's discretion.</div>
    <div>&#160;</div>
    <div style="text-align: justify; text-indent: 36pt; color: #000000; font-size: 12pt;">The undersigned hereby grants to each such Attorney-in-Fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or
      proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and
      confirming all that such Attorney-in-Fact shall lawfully do or cause to be done by virtue of the rights and powers herein granted. The undersigned acknowledges that the foregoing Attorneys-in-Fact, in serving in such capacity at the request of the
      undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Exchange Act.</div>
    <div>&#160;</div>
    <div style="text-align: justify; text-indent: 36pt; color: #000000; font-size: 12pt;">This Limited Power of Attorney shall commence on the date of execution and shall remain in full force and effect until the undersigned is no longer required to file
      Form 3, 4, or 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the Attorneys-in-Fact.</div>
    <div>&#160;</div>
    <div style="text-align: justify; text-indent: 36pt; color: #000000;"><font style="font-size: 12pt;">IN</font><font style="font-weight: bold;">&#160;</font><font style="font-size: 12pt;">WITNESS WHEREOF, I have caused this Limited Power of Attorney to be
        executed on May 26, 2021.</font></div>
    <div>&#160;</div>
    <div style="margin-left: 252pt; color: #000000; font-size: 12pt;"><u>/s/ Patrick J. Guinee</u></div>
    <div style="margin-left: 252pt; color: #000000; font-size: 12pt;">Patrick J. Guinee<u> </u></div>
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