# EDGAR Filing Document

**Accession Number:** 0000030305
**File Stem:** 0001801226-26-000002
**Filing Date:** 2026-3
**Character Count:** 8073
**Document Hash:** 2e06f7603af1821774e1338a6efec361
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001801226-26-000002.hdr.sgml**: 20260306

**ACCESSION NUMBER**: 0001801226-26-000002

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260304

**FILED AS OF DATE**: 20260306

**DATE AS OF CHANGE**: 20260306

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Tata Rajiv A.
- **CENTRAL INDEX KEY:** 0001801226

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-08174
- **FILM NUMBER:** 26732064

**MAIL ADDRESS:**
- **STREET 1:** 200 SANDPOINTE AVENUE
- **STREET 2:** SUITE 700
- **CITY:** SANTA ANA
- **STATE:** CA
- **ZIP:** 92707
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DUCOMMUN INC /DE/
- **CENTRAL INDEX KEY:** 0000030305
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIRCRAFT PART & AUXILIARY EQUIPMENT, NEC [3728]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 950693330
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 600 ANTON BOULEVARD
- **STREET 2:** SUITE 1100
- **CITY:** COSTA MESA
- **STATE:** CA
- **ZIP:** 92626
- **BUSINESS PHONE:** 657-335-3665

**MAIL ADDRESS:**
- **STREET 1:** 600 ANTON BOULEVARD
- **STREET 2:** SUITE 1100
- **CITY:** COSTA MESA
- **STATE:** CA
- **ZIP:** 92626

### 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>Tata Rajiv A.<br><sub>(Last) (First) (Middle)</sub><br>600 ANTON BLVD.<br>SUITE 1100<br><sub>(Street)</sub><br>COSTA MESA, CA 92626<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-04 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_V.P., G.C. & Corp. Secretary_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>DUCOMMUN INC /DE/ [ DCO ] | **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 | 2026-03-04 |  | A |  | 7622<sup>(1)</sup> | A | 0<sup>(2)</sup> | 37005<sup>(3)</sup> | D |  |
| Common Stock | 2026-03-04 |  | F |  | 4097<sup>(4)</sup> | D | $139.45 | 32908 | D |  |
| Common Stock | 2026-03-04 |  | A |  | 1489 | A | $0 | 34397 | D |  |
| Common Stock | 2026-03-05 |  | F |  | 615<sup>(5)</sup> | D | $130.19 | 33782 | D |  |
| Common Stock | 2026-03-05 |  | M |  | 5840 | A | $42.25 | 39622 | D |  |
| Common Stock | 2026-03-05 |  | F |  | 3958 | D | $139.45 | 35664 | D |  |
| Common Stock | 2026-03-05 |  | M |  | 2500 | A | $40.44 | 38164 | D |  |
| Common Stock | 2026-03-05 |  | F |  | 1680 | D | $139.45 | 36484 | D |  |
| Common Stock | 2026-03-05 |  | M |  | 1833 | A | $32.90 | 38317 | D |  |
| Common Stock | 2026-03-05 |  | F |  | 1186 | D | $139.45 | 37131 | 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 |
| Option - Right to Purchase<sup>(6)</sup> | $42.25 | 2026-03-05 |  | M |  | 5840 |  | 2022-06-17<sup>(7)</sup> | 2029-06-17 | Common Stock | 1882 | $0 | 35664 | D |  |
| Option - Right to Purchase<sup>(8)</sup> | $40.44 | 2026-03-05 |  | M |  | 2500 |  | 2022-10-10 | 2029-10-10 | Common Stock | 820 | $139.45 | 36484 | D |  |
| Option - Right to Purchase | $32.90 | 2026-03-05 |  | M |  | 1833 |  | 2022-10-10<sup>(9)</sup> | 2029-10-10 | Common Stock | 647 | $139.45 | 37131 | D |  |

---

### Footnotes:

(1) Acquired upon the settlement of performance stock units granted on May 8, 2023 under the Ducommun Incorporated Stock Incentive Plan as a result of the satisfaction of performance metrics underlying the award.

(2) Granted as compensation for services.

(3) The total number of securities listed includes 72 shares of common stock acquired on July 31, 2025 and 52 shares of common stock acquired on January 30, 2026, both through the Ducommun Incorporated Employee Stock Purchase Plan.

(4) Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the settlement, on March 4, 2026, of 7,622 performance stock units as described in footnote (1) above.

(5) Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the settlement, on March 5, 2026, of 1,143 restricted stock units.

(6) This option represents the right to purchase commun stock under Ducommun Incorporated's Stock Incentive Plan, which is a Rule 16b-3 plan.

(7) This option vested in one-third increments on each of June 17, 2020, 2021 and 2022.

(8) This option represents the right to purchase common stock under Ducommun Incorporated's Stock Incentive Plan, which is a Rule 16b-3 plan.

(9) This option vested in one-third increments on each of October 10, 2020, 2021 and 2022.

**Signature:** Rajiv A. Tata  
**Date:** 2026-03-06

### 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.**