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				</style></head><body lang="en-US" text="#000000" bgcolor="#ffffff"><hr class="header"><br><hr class="headerThin"><div class="contentwrapper"><table role="presentation" id="scheader"><tr><td class="tableClassNoBorderAlignCenter" style="font-size:2em;">
						SECURITIES AND EXCHANGE COMMISSION
						<br>
						Washington, D.C. 20549
					</td></tr><tr><td class="tableClassNoBorderAlignCenter"><br><br><div style="font-size:1.5em;">
									SCHEDULE 13D
								</div><br><div style="font-size:1.2em;">
							Under the Securities Exchange Act of 1934
						</div><br><div class="information" style="text-align:center; font-weight:bold;">
									(Amendment No. <span style="color:blue;">6</span>)
								</div><br><br></td></tr><tr><td class="center"><div class="information" style="text-align:center; font-weight:bold; color:blue;">FOSTER L B CO</div><div class="information" style="text-align:center; font-weight:bold;"><hr class="separatorThin">(Name of Issuer)</div><br><br></td></tr><tr><td class="center"><div class="information" style="text-align:center; font-weight:bold; color:blue;">Common Stock, par value $0.01 per share</div><div class="information" style="text-align:center; font-weight:bold;"><hr class="separatorThin">(Title of Class of Securities)</div><br><br></td></tr><table border="1"><tr><td><div class="information" style="text-align:center; font-weight:bold; color:blue;">350060109</div><div class="information" style="text-align:center; font-weight:bold;"><hr class="separatorThin">(CUSIP Number)</div></td></tr><br><br></table><tr><td class="center"><div class="information" style="text-align:center; font-weight:bold; color:blue;">ARON R. ENGLISH<br>22NW, LP,
								590 1st Ave. S, Unit C1<br>Seattle,
								WA,
								98104<br>206-227-3078</div><br><br><div class="information" style="text-align:center; font-weight:bold; color:blue;">RYAN NEBEL<br>OLSHAN FROME WOLOSKY LLP,
								1325 Avenue of the Americas<br>New York,
								NY,
								10019<br>212-451-2300</div><div class="information" style="text-align:center; font-weight:bold;"><hr class="separatorThin">(Name, Address and Telephone Number of Person Authorized to
									Receive Notices and Communications)</div></td></tr><tr><td class="center"><div class="information" style="text-align:center; font-weight:bold; color:blue;">04/09/2026</div><div class="information" style="text-align:center; font-weight:bold;"><hr class="separatorThin">(Date of Event Which Requires Filing of This Statement)</div></td></tr></table><br><br><div class="information" style="text-align:justify">
				If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.
				<img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></div><br><div class="information" style="text-align:justify">
				The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the
				Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other
				provisions of the Act (however, see the Notes).
			</div></div><hr class="headerThin"><hr class="header"><br><br>
  <div style="display:none">
			schemaVersion:
			</div>
<div class="content"><div class="form1"></div></div>
  <div class="content"><div class="form1"><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" class="tableClass" id="cusipNumber"><tr class="tableClass"><td width="7%" style="font-weight:bold;">CUSIP Number(s):</td><td width="75%"><div style="font-size:.9em; color:#000000">350060109</div></td></tr></table><br><br><table role="presentation" class="tableClass" id="reportingPersonDetails"><tr class="tableClass"><td width="8%" class="tableClassValign">1</td><td width="92%" class="tableClass">
					Name of reporting person
					<br><br><div class="text">22NW Fund, LP</div></td></tr><tr><td width="8%" class="tableClassValign">2</td><td width="92%" class="tableClass">Check the appropriate box if a member of a Group (See Instructions)
				<br><br><div class="text"><img src="/Images/box-checked.jpg" alt="Checkbox checked">  (a)
					<br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked">  (b)	
				</div></td></tr><tr class="tableClassWithBgBlack"><td width="8%" class="tableClassValign">3</td><td width="92%" class="tableClass">SEC use only</td></tr><tr><td width="8%" class="tableClassValign">4</td><td width="92%" class="tableClass">
					Source of funds (See Instructions)
					<br><br><div class="text">WC</div></td></tr><tr><td width="8%" class="tableClassValign">5</td><td width="92%" class="tableClass">
					Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
					<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">6</td><td width="92%" class="tableClass">Citizenship or place of organization
				<br><br><div class="text">
				DELAWARE
			</div></td></tr><tr><td width="8%" class="tableClassValign">Number of Shares Beneficially Owned by Each Reporting Person With:</td><td width="92%" class="tableClass"><table class="innerTableClass"><tr><td width="8%" class="innerTableClassRightValign">7</td><td width="92%" class="tableClassInnerLeft">Sole Voting Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">8</td><td width="92%" class="tableClassInnerLeft">Shared Voting Power
							<br><br><div class="text">0.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">9</td><td width="92%" class="tableClassInnerLeft">Sole Dispositive Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValignBottomLess">10</td><td width="92%" class="tableClassInnerLeftBottomLess">Shared Dispositive Power
							<br><br><div class="text">0.00</div></td></tr></table></td></tr><tr><td width="8%" class="tableClassValign">11</td><td width="92%" class="tableClass">Aggregate amount beneficially owned by each reporting person
				<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="tableClassValign">12</td><td width="92%" class="tableClass">Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
				<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">13</td><td width="92%" class="tableClass">Percent of class represented by amount in Row (11)
				<br><br><div class="text">5.6 % </div></td></tr><tr><td width="8%" class="tableClassValign">14</td><td width="92%" class="tableClass">Type of Reporting Person (See Instructions)
				<br><br><div class="text">PN</div></td></tr></table><br><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" class="tableClass" id="cusipNumber"><tr class="tableClass"><td width="7%" style="font-weight:bold;">CUSIP Number(s):</td><td width="75%"><div style="font-size:.9em; color:#000000">350060109</div></td></tr></table><br><br><table role="presentation" class="tableClass" id="reportingPersonDetails"><tr class="tableClass"><td width="8%" class="tableClassValign">1</td><td width="92%" class="tableClass">
					Name of reporting person
					<br><br><div class="text">22NW, LP</div></td></tr><tr><td width="8%" class="tableClassValign">2</td><td width="92%" class="tableClass">Check the appropriate box if a member of a Group (See Instructions)
				<br><br><div class="text"><img src="/Images/box-checked.jpg" alt="Checkbox checked">  (a)
					<br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked">  (b)	
				</div></td></tr><tr class="tableClassWithBgBlack"><td width="8%" class="tableClassValign">3</td><td width="92%" class="tableClass">SEC use only</td></tr><tr><td width="8%" class="tableClassValign">4</td><td width="92%" class="tableClass">
					Source of funds (See Instructions)
					<br><br><div class="text">OO</div></td></tr><tr><td width="8%" class="tableClassValign">5</td><td width="92%" class="tableClass">
					Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
					<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">6</td><td width="92%" class="tableClass">Citizenship or place of organization
				<br><br><div class="text">
				DELAWARE
			</div></td></tr><tr><td width="8%" class="tableClassValign">Number of Shares Beneficially Owned by Each Reporting Person With:</td><td width="92%" class="tableClass"><table class="innerTableClass"><tr><td width="8%" class="innerTableClassRightValign">7</td><td width="92%" class="tableClassInnerLeft">Sole Voting Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">8</td><td width="92%" class="tableClassInnerLeft">Shared Voting Power
							<br><br><div class="text">0.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">9</td><td width="92%" class="tableClassInnerLeft">Sole Dispositive Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValignBottomLess">10</td><td width="92%" class="tableClassInnerLeftBottomLess">Shared Dispositive Power
							<br><br><div class="text">0.00</div></td></tr></table></td></tr><tr><td width="8%" class="tableClassValign">11</td><td width="92%" class="tableClass">Aggregate amount beneficially owned by each reporting person
				<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="tableClassValign">12</td><td width="92%" class="tableClass">Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
				<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">13</td><td width="92%" class="tableClass">Percent of class represented by amount in Row (11)
				<br><br><div class="text">5.6 % </div></td></tr><tr><td width="8%" class="tableClassValign">14</td><td width="92%" class="tableClass">Type of Reporting Person (See Instructions)
				<br><br><div class="text">PN</div></td></tr></table><br><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" class="tableClass" id="cusipNumber"><tr class="tableClass"><td width="7%" style="font-weight:bold;">CUSIP Number(s):</td><td width="75%"><div style="font-size:.9em; color:#000000">350060109</div></td></tr></table><br><br><table role="presentation" class="tableClass" id="reportingPersonDetails"><tr class="tableClass"><td width="8%" class="tableClassValign">1</td><td width="92%" class="tableClass">
					Name of reporting person
					<br><br><div class="text">22NW Fund GP, LLC</div></td></tr><tr><td width="8%" class="tableClassValign">2</td><td width="92%" class="tableClass">Check the appropriate box if a member of a Group (See Instructions)
				<br><br><div class="text"><img src="/Images/box-checked.jpg" alt="Checkbox checked">  (a)
					<br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked">  (b)	
				</div></td></tr><tr class="tableClassWithBgBlack"><td width="8%" class="tableClassValign">3</td><td width="92%" class="tableClass">SEC use only</td></tr><tr><td width="8%" class="tableClassValign">4</td><td width="92%" class="tableClass">
					Source of funds (See Instructions)
					<br><br><div class="text">OO</div></td></tr><tr><td width="8%" class="tableClassValign">5</td><td width="92%" class="tableClass">
					Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
					<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">6</td><td width="92%" class="tableClass">Citizenship or place of organization
				<br><br><div class="text">
				DELAWARE
			</div></td></tr><tr><td width="8%" class="tableClassValign">Number of Shares Beneficially Owned by Each Reporting Person With:</td><td width="92%" class="tableClass"><table class="innerTableClass"><tr><td width="8%" class="innerTableClassRightValign">7</td><td width="92%" class="tableClassInnerLeft">Sole Voting Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">8</td><td width="92%" class="tableClassInnerLeft">Shared Voting Power
							<br><br><div class="text">0.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">9</td><td width="92%" class="tableClassInnerLeft">Sole Dispositive Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValignBottomLess">10</td><td width="92%" class="tableClassInnerLeftBottomLess">Shared Dispositive Power
							<br><br><div class="text">0.00</div></td></tr></table></td></tr><tr><td width="8%" class="tableClassValign">11</td><td width="92%" class="tableClass">Aggregate amount beneficially owned by each reporting person
				<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="tableClassValign">12</td><td width="92%" class="tableClass">Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
				<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">13</td><td width="92%" class="tableClass">Percent of class represented by amount in Row (11)
				<br><br><div class="text">5.6 % </div></td></tr><tr><td width="8%" class="tableClassValign">14</td><td width="92%" class="tableClass">Type of Reporting Person (See Instructions)
				<br><br><div class="text">OO</div></td></tr></table><br><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" class="tableClass" id="cusipNumber"><tr class="tableClass"><td width="7%" style="font-weight:bold;">CUSIP Number(s):</td><td width="75%"><div style="font-size:.9em; color:#000000">350060109</div></td></tr></table><br><br><table role="presentation" class="tableClass" id="reportingPersonDetails"><tr class="tableClass"><td width="8%" class="tableClassValign">1</td><td width="92%" class="tableClass">
					Name of reporting person
					<br><br><div class="text">22NW GP, Inc.</div></td></tr><tr><td width="8%" class="tableClassValign">2</td><td width="92%" class="tableClass">Check the appropriate box if a member of a Group (See Instructions)
				<br><br><div class="text"><img src="/Images/box-checked.jpg" alt="Checkbox checked">  (a)
					<br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked">  (b)	
				</div></td></tr><tr class="tableClassWithBgBlack"><td width="8%" class="tableClassValign">3</td><td width="92%" class="tableClass">SEC use only</td></tr><tr><td width="8%" class="tableClassValign">4</td><td width="92%" class="tableClass">
					Source of funds (See Instructions)
					<br><br><div class="text">OO</div></td></tr><tr><td width="8%" class="tableClassValign">5</td><td width="92%" class="tableClass">
					Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
					<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">6</td><td width="92%" class="tableClass">Citizenship or place of organization
				<br><br><div class="text">
				DELAWARE
			</div></td></tr><tr><td width="8%" class="tableClassValign">Number of Shares Beneficially Owned by Each Reporting Person With:</td><td width="92%" class="tableClass"><table class="innerTableClass"><tr><td width="8%" class="innerTableClassRightValign">7</td><td width="92%" class="tableClassInnerLeft">Sole Voting Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">8</td><td width="92%" class="tableClassInnerLeft">Shared Voting Power
							<br><br><div class="text">0.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">9</td><td width="92%" class="tableClassInnerLeft">Sole Dispositive Power
							<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValignBottomLess">10</td><td width="92%" class="tableClassInnerLeftBottomLess">Shared Dispositive Power
							<br><br><div class="text">0.00</div></td></tr></table></td></tr><tr><td width="8%" class="tableClassValign">11</td><td width="92%" class="tableClass">Aggregate amount beneficially owned by each reporting person
				<br><br><div class="text">588,674.00</div></td></tr><tr><td width="8%" class="tableClassValign">12</td><td width="92%" class="tableClass">Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
				<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">13</td><td width="92%" class="tableClass">Percent of class represented by amount in Row (11)
				<br><br><div class="text">5.6 % </div></td></tr><tr><td width="8%" class="tableClassValign">14</td><td width="92%" class="tableClass">Type of Reporting Person (See Instructions)
				<br><br><div class="text">CO</div></td></tr></table><br><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" class="tableClass" id="cusipNumber"><tr class="tableClass"><td width="7%" style="font-weight:bold;">CUSIP Number(s):</td><td width="75%"><div style="font-size:.9em; color:#000000">350060109</div></td></tr></table><br><br><table role="presentation" class="tableClass" id="reportingPersonDetails"><tr class="tableClass"><td width="8%" class="tableClassValign">1</td><td width="92%" class="tableClass">
					Name of reporting person
					<br><br><div class="text">English Aron R.</div></td></tr><tr><td width="8%" class="tableClassValign">2</td><td width="92%" class="tableClass">Check the appropriate box if a member of a Group (See Instructions)
				<br><br><div class="text"><img src="/Images/box-checked.jpg" alt="Checkbox checked">  (a)
					<br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked">  (b)	
				</div></td></tr><tr class="tableClassWithBgBlack"><td width="8%" class="tableClassValign">3</td><td width="92%" class="tableClass">SEC use only</td></tr><tr><td width="8%" class="tableClassValign">4</td><td width="92%" class="tableClass">
					Source of funds (See Instructions)
					<br><br><div class="text">PF, OO</div></td></tr><tr><td width="8%" class="tableClassValign">5</td><td width="92%" class="tableClass">
					Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
					<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">6</td><td width="92%" class="tableClass">Citizenship or place of organization
				<br><br><div class="text">
				UNITED STATES
			</div></td></tr><tr><td width="8%" class="tableClassValign">Number of Shares Beneficially Owned by Each Reporting Person With:</td><td width="92%" class="tableClass"><table class="innerTableClass"><tr><td width="8%" class="innerTableClassRightValign">7</td><td width="92%" class="tableClassInnerLeft">Sole Voting Power
							<br><br><div class="text">589,579.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">8</td><td width="92%" class="tableClassInnerLeft">Shared Voting Power
							<br><br><div class="text">0.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">9</td><td width="92%" class="tableClassInnerLeft">Sole Dispositive Power
							<br><br><div class="text">589,579.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValignBottomLess">10</td><td width="92%" class="tableClassInnerLeftBottomLess">Shared Dispositive Power
							<br><br><div class="text">0.00</div></td></tr></table></td></tr><tr><td width="8%" class="tableClassValign">11</td><td width="92%" class="tableClass">Aggregate amount beneficially owned by each reporting person
				<br><br><div class="text">589,579.00</div></td></tr><tr><td width="8%" class="tableClassValign">12</td><td width="92%" class="tableClass">Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
				<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">13</td><td width="92%" class="tableClass">Percent of class represented by amount in Row (11)
				<br><br><div class="text">5.6 % </div></td></tr><tr><td width="8%" class="tableClassValign">14</td><td width="92%" class="tableClass">Type of Reporting Person (See Instructions)
				<br><br><div class="text">IN</div></td></tr></table><br><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" class="tableClass" id="cusipNumber"><tr class="tableClass"><td width="7%" style="font-weight:bold;">CUSIP Number(s):</td><td width="75%"><div style="font-size:.9em; color:#000000">350060109</div></td></tr></table><br><br><table role="presentation" class="tableClass" id="reportingPersonDetails"><tr class="tableClass"><td width="8%" class="tableClassValign">1</td><td width="92%" class="tableClass">
					Name of reporting person
					<br><br><div class="text">Hirai-Hadley Bryson</div></td></tr><tr><td width="8%" class="tableClassValign">2</td><td width="92%" class="tableClass">Check the appropriate box if a member of a Group (See Instructions)
				<br><br><div class="text"><img src="/Images/box-checked.jpg" alt="Checkbox checked">  (a)
					<br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked">  (b)	
				</div></td></tr><tr class="tableClassWithBgBlack"><td width="8%" class="tableClassValign">3</td><td width="92%" class="tableClass">SEC use only</td></tr><tr><td width="8%" class="tableClassValign">4</td><td width="92%" class="tableClass">
					Source of funds (See Instructions)
					<br><br><div class="text">PF</div></td></tr><tr><td width="8%" class="tableClassValign">5</td><td width="92%" class="tableClass">
					Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
					<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">6</td><td width="92%" class="tableClass">Citizenship or place of organization
				<br><br><div class="text">
				UNITED STATES
			</div></td></tr><tr><td width="8%" class="tableClassValign">Number of Shares Beneficially Owned by Each Reporting Person With:</td><td width="92%" class="tableClass"><table class="innerTableClass"><tr><td width="8%" class="innerTableClassRightValign">7</td><td width="92%" class="tableClassInnerLeft">Sole Voting Power
							<br><br><div class="text">991.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">8</td><td width="92%" class="tableClassInnerLeft">Shared Voting Power
							<br><br><div class="text">0.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValign">9</td><td width="92%" class="tableClassInnerLeft">Sole Dispositive Power
							<br><br><div class="text">991.00</div></td></tr><tr><td width="8%" class="innerTableClassRightValignBottomLess">10</td><td width="92%" class="tableClassInnerLeftBottomLess">Shared Dispositive Power
							<br><br><div class="text">0.00</div></td></tr></table></td></tr><tr><td width="8%" class="tableClassValign">11</td><td width="92%" class="tableClass">Aggregate amount beneficially owned by each reporting person
				<br><br><div class="text">991.00</div></td></tr><tr><td width="8%" class="tableClassValign">12</td><td width="92%" class="tableClass">Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
				<br><br><img src="/Images/box-unchecked.jpg" alt="Checkbox not checked"></td></tr><tr><td width="8%" class="tableClassValign">13</td><td width="92%" class="tableClass">Percent of class represented by amount in Row (11)
				<br><br><div class="text">0.01 % </div></td></tr><tr><td width="8%" class="tableClassValign">14</td><td width="92%" class="tableClass">Type of Reporting Person (See Instructions)
				<br><br><div class="text">IN</div></td></tr></table><br></div><div class="form1"><table><tr><td class="center"><br><br><p><div align="center" style="font-size:1.2em;">
									SCHEDULE 13D
								</div></p></td></tr></table><table role="presentation" id="item1to7"><tr><td width="8%" class="tableClassValignNoBorder">Item 1.</td><td width="92%" class="tableClassNoBorder">Security and Issuer</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignCenter">(a)</td><td width="92%" class="tableClassNoBorder">Title of Class of Securities:
							<br><br><div class="text">Common Stock, par value $0.01 per share</div></td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignCenter">(b)</td><td width="92%" class="tableClassNoBorder">Name of Issuer:
							<br><br><div class="text">FOSTER L B CO</div></td></tr><tr><td width="8%" class="tableClassNoBorderAlignCenter">(c)</td><td width="92%" class="tableClassNoBorder">Address of Issuer's Principal Executive Offices:
							<br><br><div class="text">415 HOLIDAY DR, PITTSBURGH, 
				PENNSYLVANIA
			, 15220.</div></td></tr><tr><td width="8%" class="tableClassValignNoBorder">Item 3.</td><td width="92%" class="tableClassNoBorder">Source and Amount of Funds or Other Consideration</td></tr><tr><td width="8%" class="tableClassNoBorderAlignCenter"> </td><td width="92%" class="tableClassNoBorder"><div class="largetext">Item 3 is hereby amended and restated to read as follows:

The Shares purchased by 22NW Fund were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business). The aggregate purchase price of the 588,674 Shares beneficially owned by 22NW Fund is approximately $6,828,618, excluding brokerage commissions.

The Shares directly owned by Mr. English were purchased with personal funds (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business). The aggregate purchase price of the 905 Shares directly owned by Mr. English is approximately $10,000, excluding brokerage commissions.

The Shares directly owned by Mr. Hirai-Hadley were purchased with personal funds (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business). The aggregate purchase price of the 991 Shares directly owned by Mr. Hirai-Hadley is approximately $15,195, excluding brokerage commissions.</div></td></tr><tr><td width="8%" class="tableClassValignNoBorder">Item 5.</td><td width="92%" class="tableClassNoBorder">Interest in Securities of the Issuer</td></tr><tr><td width="8%" class="tableClassNoBorderAlignCenter">(a)</td><td width="92%" class="tableClassNoBorder"><div class="largetext">Item 5(a) is hereby amended and restated to read as follows:

The aggregate percentage of Shares reported owned by each person named herein is based upon 10,458,591 Shares outstanding as of March 19, 2026, which is the total number of Shares outstanding as reported in the Issuer's proxy statement on Schedule 14A filed with the Securities and Exchange Commission on April 10, 2026.

As of the date hereof, 22NW Fund directly beneficially owned 588,674 Shares, constituting approximately 5.6% of the Shares outstanding.

As of the date hereof, Mr. English directly beneficially owned 905 Shares, constituting approximately 0.01% of the Shares outstanding.

As of the date hereof, Mr. Hirai-Hadley directly beneficially owned 991 Shares, constituting approximately 0.01% of the Shares outstanding.

22NW, as the investment manager of 22NW Fund, may be deemed to beneficially own the 588,674 Shares owned by 22NW Fund, constituting approximately 5.6% of the Shares outstanding. 22NW GP, as the general partner of 22NW Fund, may be deemed to beneficially own the 588,674 Shares owned by 22NW Fund, constituting approximately 5.6% of the Shares outstanding. 22NW Inc., as the general partner of 22NW, may be deemed to beneficially own the 588,674 Shares owned by 22NW Fund, constituting approximately 5.6% of the Shares outstanding. Mr. English, as the Portfolio Manager of 22NW, Manager of 22NW GP and President and sole shareholder of 22NW Inc., may be deemed to beneficially own the 588,674 Shares owned by 22NW Fund, which, together with the Shares he directly beneficially owns, constitutes an aggregate of 589,579 Shares, constituting approximately 5.6% of the Shares outstanding.</div></td></tr><tr><td width="8%" class="tableClassNoBorderAlignCenter">(c)</td><td width="92%" class="tableClassNoBorder"><div class="largetext">Item 5(c) is hereby amended and restated to read as follows:

The transactions in the Shares by the Reporting Persons since the filing of Amendment No. 5 to the Schedule 13D are set forth in Exhibit 1 and are incorporated herein by reference. All of such transactions were effected in the open market unless otherwise noted therein.</div></td></tr><tr><td width="8%" class="tableClassValignNoBorder">Item 7.</td><td width="92%" class="tableClassNoBorder">Material to be Filed as Exhibits.</td></tr><tr><td width="8%" class="tableClassNoBorderAlignCenter"> </td><td width="92%" class="tableClassNoBorder"><div class="largetext">Item 7 is hereby amended to add the following exhibit:

1 - Transactions in Securities.</div></td></tr></table><br></div><div class="form1"><table role="presentation" id="signatureInfo"><tr><td width="8%" class="tableClassValignNoBorder">    SIGNATURE</td><td width="92%" class="tableClassNoBorder"> </td></tr><tr><td width="8%" class="tableClassNoBorderAlignCenter"> </td><td width="92%" class="tableClassNoBorder"><div class="information" style="text-align:justify">
						After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
						<br><br></div></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="100%" class="tableClassInnerNoBorderBlue"><div class="text">22NW Fund, LP</div></td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Signature:</td><td width="92%" class="tableClassNoBorderBlue signature">/s/ Aron R. English</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Name/Title:</td><td width="92%" class="tableClassNoBorderBlue signature">Aron R. English, Manager of 22NW Fund GP, LLC, General Partner</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Date:</td><td width="92%" class="tableClassNoBorderBlue signature">04/14/2026</td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="100%" class="tableClassInnerNoBorderBlue"><div class="text">22NW, LP</div></td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Signature:</td><td width="92%" class="tableClassNoBorderBlue signature">/s/ Aron R. English</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Name/Title:</td><td width="92%" class="tableClassNoBorderBlue signature">Aron R. English, President and Sole Shareholder of 22NW GP, Inc., General Partner</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Date:</td><td width="92%" class="tableClassNoBorderBlue signature">04/14/2026</td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="100%" class="tableClassInnerNoBorderBlue"><div class="text">22NW Fund GP, LLC</div></td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Signature:</td><td width="92%" class="tableClassNoBorderBlue signature">/s/ Aron R. English</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Name/Title:</td><td width="92%" class="tableClassNoBorderBlue signature">Aron R. English, Manager</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Date:</td><td width="92%" class="tableClassNoBorderBlue signature">04/14/2026</td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="100%" class="tableClassInnerNoBorderBlue"><div class="text">22NW GP, Inc.</div></td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Signature:</td><td width="92%" class="tableClassNoBorderBlue signature">/s/ Aron R. English</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Name/Title:</td><td width="92%" class="tableClassNoBorderBlue signature">Aron R. English, Manager</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Date:</td><td width="92%" class="tableClassNoBorderBlue signature">04/14/2026</td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="100%" class="tableClassInnerNoBorderBlue"><div class="text">English Aron R.</div></td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Signature:</td><td width="92%" class="tableClassNoBorderBlue signature">/s/ Aron R. English</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Name/Title:</td><td width="92%" class="tableClassNoBorderBlue signature">Aron R. English</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Date:</td><td width="92%" class="tableClassNoBorderBlue signature">04/14/2026</td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="100%" class="tableClassInnerNoBorderBlue"><div class="text">Hirai-Hadley Bryson</div></td></tr></table></td></tr></table><table><tr class="tableClass"><td width="50%" class="tableClassNoBorder"> </td><td width="50%" class="tableClassNoBorder"><table><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Signature:</td><td width="92%" class="tableClassNoBorderBlue signature">/s/ Bryson O. Hirai-Hadley</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Name/Title:</td><td width="92%" class="tableClassNoBorderBlue signature">Bryson O. Hirai-Hadley</td></tr><tr class="tableClass"><td width="8%" class="tableClassNoBorderAlignLeft signature">Date:</td><td width="92%" class="tableClassNoBorderBlue signature">04/14/2026</td></tr></table></td></tr></table></div></div>

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