L.B. Foster (FSTR) director-affiliated fund reports share sales

Rhea-AI Filing Summary

L.B. Foster Company insider share sales: An investment fund linked to director Aron R. English reported open-market sales of the company’s common stock. On 12/11/2025, 22NW Fund, LP sold 34,025 shares of L.B. Foster common stock, followed by a sale of 13,512 shares on 12/12/2025. The shares were sold at weighted-average prices in the high-$26 per-share range in multiple transactions. After these sales, the reporting persons continued to beneficially own 1,191,046 shares of L.B. Foster common stock indirectly through 22NW Fund, LP. They state they may be part of a group that collectively beneficially owns more than 10% of L.B. Foster’s outstanding shares and each disclaims beneficial ownership beyond their pecuniary interest.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

English Aron R.

(Last) (First) (Middle)

590 1ST AVE. S

UNIT C1

(Street)

SEATTLE WA 98104

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
FOSTER L B CO [ FSTR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
12/11/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock(1)	12/11/2025		S		34,025	D	$26.7941(2)	1,204,558	I	By: 22NW Fund, LP(3)
Common Stock(1)	12/12/2025		S		13,512	D	$26.7855(4)	1,191,046	I	By: 22NW Fund, LP(3)
Common Stock(1)								905	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

English Aron R.

(Last) (First) (Middle)

590 1ST AVE. S

UNIT C1

(Street)

SEATTLE WA 98104

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

22NW, LP

(Last) (First) (Middle)

590 1ST AVE. S

UNIT C1

(Street)

SEATTLE WA 98104

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

22NW Fund, LP

(Last) (First) (Middle)

590 1ST AVE. S

UNIT C1

(Street)

SEATTLE WA 98104

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

22NW Fund GP, LLC

(Last) (First) (Middle)

590 1ST AVE. S

UNIT C1

(Street)

SEATTLE WA 98104

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

22NW GP, Inc.

(Last) (First) (Middle)

590 1ST AVE. S

UNIT C1

(Street)

SEATTLE WA 98104

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. This Form 4 is filed jointly by 22NW Fund, LP ("22NW Fund"), 22NW, LP ("22NW"), 22NW Fund GP, LLC ("22NW GP"), 22NW GP, Inc. ("22NW Inc.") and Aron English (collectively, the "Reporting Persons"). Each of the Reporting Persons may be deemed to be a member of a Section 13(d) group that collectively beneficially owns more than 10% of the Issuer's outstanding shares of Common Stock. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein.

2. Represents a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.7500 to $27.1500, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

3. Securities owned directly by 22NW Fund. As the investment manager to 22NW Fund, 22NW may be deemed to beneficially own the securities owned directly by 22NW Fund. As the general partner of 22NW Fund, 22NW GP may be deemed to beneficially own the securities owned directly by 22NW Fund. As the general partner of 22NW, 22NW Inc. may be deemed to beneficially own the securities owned directly by 22NW Fund. 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 securities owned directly by 22NW Fund.

4. Represents a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.7500 to $26.9800, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

	/s/ Aron R. English	12/12/2025
	22NW Fund, LP; By: 22NW Fund GP, LLC; By: /s/ Aron R. English, Manager	12/12/2025
	22NW, LP; By: 22NW GP, Inc.; By: /s/ Aron R. English, President and Sole Shareholder	12/12/2025
	22NW Fund GP, LLC; By: /s/ Aron R. English, Manager	12/12/2025
	22NW GP, Inc., By: /s/ Aron R. English, President and Sole Shareholder	12/12/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider share sales did L.B. Foster (FSTR) report in this filing?

The filing reports that 22NW Fund, LP, an investment fund linked to director Aron R. English, sold 34,025 shares of L.B. Foster common stock on 12/11/2025 and 13,512 shares on 12/12/2025 in open-market transactions.

At what prices were the L.B. Foster (FSTR) shares sold?

The filing states that the 12/11/2025 sales had a weighted average price of $26.7941 per share, with individual trades between $26.7500 and $27.1500. The 12/12/2025 sales had a weighted average price of $26.7855 per share, with trades between $26.7500 and $26.9800.

How many L.B. Foster (FSTR) shares do the reporting persons own after these sales?

After the reported transactions, the filing shows that the reporting persons beneficially owned 1,191,046 shares of L.B. Foster common stock indirectly through 22NW Fund, LP.

What is the relationship of Aron R. English and 22NW entities to L.B. Foster (FSTR)?

The filing identifies Aron R. English as a director of L.B. Foster. It states that 22NW Fund, LP, 22NW, LP, 22NW Fund GP, LLC, 22NW GP, Inc. and Mr. English (together, the reporting persons) may be deemed part of a Section 13(d) group that collectively beneficially owns more than 10% of L.B. Foster’s outstanding common stock.

Do the reporting persons claim full beneficial ownership of all the L.B. Foster (FSTR) shares reported?

No. The filing explains that each of the reporting persons disclaims beneficial ownership of the securities reported except to the extent of his or its pecuniary interest in those shares.

How were the L.B. Foster (FSTR) sale prices calculated in this insider report?

The prices reported for the sales on both 12/11/2025 and 12/12/2025 are described as weighted average prices, and the filing notes that the shares were sold in multiple transactions within the stated price ranges.