# EDGAR Filing Document

**Accession Number:** 0001640809
**File Stem:** 0000921895-25-003030
**Filing Date:** 2025-11
**Character Count:** 14830
**Document Hash:** 640b6f72ea702c073e00e79142cce9e6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000921895-25-003030.hdr.sgml**: 20251113

**ACCESSION NUMBER**: 0000921895-25-003030

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251111

**FILED AS OF DATE**: 20251113

**DATE AS OF CHANGE**: 20251113

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** 22NW, LP
- **CENTRAL INDEX KEY:** 0001694297

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-10436
- **FILM NUMBER:** 251480331

**BUSINESS ADDRESS:**
- **STREET 1:** 590 1ST AVE S, UNIT C1
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98104
- **BUSINESS PHONE:** 206-437-9174

**MAIL ADDRESS:**
- **STREET 1:** 590 1ST AVE S, UNIT C1
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98104
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** 22NW Fund, LP
- **CENTRAL INDEX KEY:** 0001640809

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-10436
- **FILM NUMBER:** 251480330

**BUSINESS ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY
- **STREET 2:** SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
- **BUSINESS PHONE:** 206-227-3078

**MAIL ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY
- **STREET 2:** SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** 22NW GP, Inc.
- **CENTRAL INDEX KEY:** 0001783663

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-10436
- **FILM NUMBER:** 251480328

**BUSINESS ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY, SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
- **BUSINESS PHONE:** 206-227-3078

**MAIL ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY, SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** English Aron R.
- **CENTRAL INDEX KEY:** 0001770436

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-10436
- **FILM NUMBER:** 251480332

**MAIL ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY, SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** 22NW Fund GP, LLC
- **CENTRAL INDEX KEY:** 0001770575

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-10436
- **FILM NUMBER:** 251480329

**BUSINESS ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY, SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
- **BUSINESS PHONE:** 206-227-3078

**MAIL ADDRESS:**
- **STREET 1:** 1455 NW LEARY WAY, SUITE 400
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98107
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FOSTER L B CO
- **CENTRAL INDEX KEY:** 0000352825
- **STANDARD INDUSTRIAL CLASSIFICATION:** WHOLESALE-METALS SERVICE CENTERS & OFFICES [5051]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 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

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>English Aron R.<br><sub>(Last) (First) (Middle)</sub><br>590 1ST AVE. S<br>UNIT C1<br><sub>(Street)</sub><br>SEATTLE, WA 98104<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>FOSTER L B CO [ FSTR ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>22NW, LP<br><sub>(Last) (First) (Middle)</sub><br>590 1ST AVE. S<br>UNIT C1<br><sub>(Street)</sub><br>SEATTLE, WA 98104<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>FOSTER L B CO [ FSTR ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>22NW Fund, LP<br><sub>(Last) (First) (Middle)</sub><br>590 1ST AVE. S<br>UNIT C1<br><sub>(Street)</sub><br>SEATTLE, WA 98104<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>FOSTER L B CO [ FSTR ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>22NW Fund GP, LLC<br><sub>(Last) (First) (Middle)</sub><br>590 1ST AVE. S<br>UNIT C1<br><sub>(Street)</sub><br>SEATTLE, WA 98104<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>FOSTER L B CO [ FSTR ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>22NW GP, Inc.<br><sub>(Last) (First) (Middle)</sub><br>590 1ST AVE. S<br>UNIT C1<br><sub>(Street)</sub><br>SEATTLE, WA 98104<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>FOSTER L B CO [ FSTR ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock<sup>(1)</sup> | 2025-11-11 |  | S |  | 4813 | D | 28.1749<sup>(2)</sup> | 1308308 | I | By: 22NW Fund, LP<sup>(3)</sup> |
| Common Stock<sup>(1)</sup> | 2025-11-11 |  | S |  | 2749 | D | 27.5187<sup>(4)</sup> | 1305559 | I | By: 22NW Fund, LP<sup>(3)</sup> |
| Common Stock<sup>(1)</sup> | 2025-11-12 |  | S |  | 3368 | D | 27.0643<sup>(5)</sup> | 1302191 | I | By: 22NW Fund, LP<sup>(3)</sup> |
| Common Stock<sup>(1)</sup> | 2025-11-13 |  | S |  | 1600 | D | 27.0019<sup>(6)</sup> | 1300591 | I | By: 22NW Fund, LP<sup>(3)</sup> |
| Common Stock<sup>(1)</sup> |  |  |  |  |  |  |  | 905 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(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 $28.1600 to $28.1750, 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 at each separate price within the range set forth in this footnote.

(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 $27.1000 to $28.0200, 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 at each separate price within the range set forth in this footnote.

(5) Represents a weighted average price. These shares were sold in multiple transactions at prices ranging from $27 to $27.2400, 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 at each separate price within the range set forth in this footnote.

(6) Represents a weighted average price. These shares were sold in multiple transactions at prices ranging from $27 to $27.0300, 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 at each separate price within the range set forth in this footnote.

**Signature:** /s/ Aron R. English  
**Date:** 2025-11-13

**Signature:** 22NW Fund, LP; By: 22NW Fund GP, LLC; By: /s/ Aron R. English, Manager  
**Date:** 2025-11-13

**Signature:** 22NW, LP; By: 22NW GP, Inc.; By: /s/ Aron R. English, President and Sole Shareholder  
**Date:** 2025-11-13

**Signature:** 22NW Fund GP, LLC; By: /s/ Aron R. English, Manager  
**Date:** 2025-11-13

**Signature:** 22NW GP, Inc., By: /s/ Aron R. English, President and Sole Shareholder  
**Date:** 2025-11-13

### Remarks:

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.**