# EDGAR Filing Document

**Accession Number:** 0001508155
**File Stem:** 0001111928-26-000023
**Filing Date:** 2026-2
**Character Count:** 13807
**Document Hash:** df3c1fa2d652a5d14aea25c7560a86fb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001111928-26-000023.hdr.sgml**: 20260218

**ACCESSION NUMBER**: 0001111928-26-000023

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260217

**FILED AS OF DATE**: 20260218

**DATE AS OF CHANGE**: 20260218

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Valentin Gapontsev Trust I
- **CENTRAL INDEX KEY:** 0001508155

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

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-33155
- **FILM NUMBER:** 26648639

**BUSINESS ADDRESS:**
- **STREET 1:** 3 EXECUTIVE PARK DRIVE, SUITE 302
- **CITY:** BEDFORD
- **STATE:** NH
- **ZIP:** 03110
- **BUSINESS PHONE:** 508-373-1123

**MAIL ADDRESS:**
- **STREET 1:** 3 EXECUTIVE PARK DRIVE, SUITE 302
- **CITY:** BEDFORD
- **STATE:** NH
- **ZIP:** 03110
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IPG PHOTONICS CORP
- **CENTRAL INDEX KEY:** 0001111928
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 043444218
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 377 SIMARANO DRIVE
- **CITY:** MARLBOROUGH
- **STATE:** MA
- **ZIP:** 01752
- **BUSINESS PHONE:** 5083731100

**MAIL ADDRESS:**
- **STREET 1:** 377 SIMARANO DRIVE
- **CITY:** MARLBOROUGH
- **STATE:** MA
- **ZIP:** 01752

### 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).

[x] 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>Valentin Gapontsev Trust I<br><sub>(Last) (First) (Middle)</sub><br>3 EXECUTIVE PARK DRIVE, SUITE 302<br><sub>(Street)</sub><br>BEDFORD, NH 03110<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-02-17 | **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>IPG PHOTONICS CORP [ IPGP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] 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 | 2026-02-17 |  | S |  | 6590 | D<sup>(1)</sup> | 125.40<sup>(2)</sup> | 6786509 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 6820 | D<sup>(1)</sup> | 126.33<sup>(3)</sup> | 6779689 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 4354 | D<sup>(1)</sup> | 127.42<sup>(4)</sup> | 6775335 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 5012 | D<sup>(1)</sup> | 128.33<sup>(5)</sup> | 6770323 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 3931 | D<sup>(1)</sup> | 129.56<sup>(6)</sup> | 6766392 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 4931 | D<sup>(1)</sup> | 130.57<sup>(7)</sup> | 6761461 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 8383 | D<sup>(1)</sup> | 131.67<sup>(8)</sup> | 6753078 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 15882 | D<sup>(1)</sup> | 132.40<sup>(9)</sup> | 6737196 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 4035 | D<sup>(1)</sup> | 133.42<sup>(10)</sup> | 6733161 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 125 | D<sup>(1)</sup> | $134.12 | 6733036 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 1381 | D<sup>(1)</sup> | 135.93<sup>(11)</sup> | 6731655 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 1393 | D<sup>(1)</sup> | 136.89<sup>(12)</sup> | 6730262 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 790 | D<sup>(1)</sup> | 137.79<sup>(13)</sup> | 6729472 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 760 | D<sup>(1)</sup> | 138.82<sup>(14)</sup> | 6728712 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 100 | D<sup>(1)</sup> | $140.58 | 6728612 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 376 | D<sup>(1)</sup> | 141.97<sup>(15)</sup> | 6728236 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 137 | D<sup>(1)</sup> | 143.71<sup>(16)</sup> | 6728099 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 480 | D<sup>(1)</sup> | 144.29<sup>(17)</sup> | 6727619 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 410 | D<sup>(1)</sup> | $146.21 | 6727209 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 220 | D<sup>(1)</sup> | $148 | 6726989 | D |  |
| Common Stock | 2026-02-17 |  | S |  | 390 | D<sup>(1)</sup> | 149.88<sup>(18)</sup> | 6726599 | 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) The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025.

(2) The reported transaction involves sale transactions ranging from $124.92 to $125.86 per share. The weighted average price per share was $125.40. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(3) The reported transaction involves sale transactions ranging from $125.92 to $126.88 per share. The weighted average price per share was $126.33. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(4) The reported transaction involves sale transactions ranging from $126.92 to $127.90 per share. The weighted average price per share was $127.42. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(5) The reported transaction involves sale transactions ranging from $127.92 to $128.80 per share. The weighted average price per share was $128.33. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(6) The reported transaction involves sale transactions ranging from $129.02 to $130.01 per share. The weighted average price per share was $129.56. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(7) The reported transaction involves sale transactions ranging from $130.03 to $131.02 per share. The weighted average price per share was $130.57. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(8) The reported transaction involves sale transactions ranging from $131.03 to $132.02 per share. The weighted average price per share was $131.67. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(9) The reported transaction involves sale transactions ranging from $132.03 to $132.99 per share. The weighted average price per share was $132.40. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(10) The reported transaction involves sale transactions ranging from $133.05 to $133.87 per share. The weighted average price per share was $133.42. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(11) The reported transaction involves sale transactions ranging from $135.40 to $136.39 per share. The weighted average price per share was $135.93. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(12) The reported transaction involves sale transactions ranging from $136.45 to $137.41 per share. The weighted average price per share was $136.89. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(13) The reported transaction involves sale transactions ranging from $137.46 to $138.44 per share. The weighted average price per share was $137.79. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(14) The reported transaction involves sale transactions ranging from $138.50 to $139.10 per share. The weighted average price per share was $138.82. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(15) The reported transaction involves sale transactions ranging from $141.72 to $142.46 per share. The weighted average price per share was $141.97. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(16) The reported transaction involves sale transactions ranging from $143.00 to $143.72 per share. The weighted average price per share was $143.71. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(17) The reported transaction involves sale transactions ranging from $144.20 to $144.51 per share. The weighted average price per share was $144.29. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

(18) The reported transaction involves sale transactions ranging from $149.12 to $150.01 per share. The weighted average price per share was $149.88. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price.

**Signature:** /s/ Angelo P. Lopresti, Attorney-in-fact for Valentin Gapontsev Trust I  
**Date:** 2026-02-18

### 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.**