# EDGAR Filing Document

**Accession Number:** 0000860546
**File Stem:** 0000860546-26-000019
**Filing Date:** 2026-3
**Character Count:** 2702
**Document Hash:** 5d18e2064ae6c4108e45d2491d74164c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000860546-26-000019.hdr.sgml**: 20260330

**ACCESSION NUMBER**: 0000860546-26-000019

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260330

**DATE AS OF CHANGE**: 20260330

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COPT DEFENSE PROPERTIES
- **CENTRAL INDEX KEY:** 0000860546
- **STANDARD INDUSTRIAL CLASSIFICATION:** REAL ESTATE INVESTMENT TRUSTS [6798]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 232947217
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14023
- **FILM NUMBER:** 26813755

**BUSINESS ADDRESS:**
- **STREET 1:** 6711 COLUMBIA GATEWAY DRIVE
- **STREET 2:** SUITE 300
- **CITY:** COLUMBIA
- **STATE:** MD
- **ZIP:** 21046
- **BUSINESS PHONE:** 4432855400

**MAIL ADDRESS:**
- **STREET 1:** 6711 COLUMBIA GATEWAY DRIVE
- **STREET 2:** SUITE 300
- **CITY:** COLUMBIA
- **STATE:** MD
- **ZIP:** 21046

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CORPORATE OFFICE PROPERTIES TRUST
- **DATE OF NAME CHANGE:** 19980514

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CORPORATE OFFICE PROPERTIES TRUST INC
- **DATE OF NAME CHANGE:** 19980105

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ROYALE INVESTMENTS INC
- **DATE OF NAME CHANGE:** 19930328

**UNITED STATES<br>SECURITIES AND EXCHANGE COMMISSION** 

**Washington, DC 20549** 

**SCHEDULE 14A** 

**Proxy Statement Pursuant to Section 14(a) of<br>the Securities Exchange Act of 1934 (Amendment No.)** 

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐&nbsp;&nbsp;&nbsp;&nbsp;Preliminary Proxy Statement

☐&nbsp;&nbsp;&nbsp;&nbsp;**Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))** 

☐&nbsp;&nbsp;&nbsp;&nbsp;Definitive Proxy Statement

☒&nbsp;&nbsp;&nbsp;&nbsp;Definitive Additional Materials

☐&nbsp;&nbsp;&nbsp;&nbsp;Soliciting Material under §240.14a-12

![coptmaina.jpg](coptmaina.jpg)

**COPT DEFENSE PROPERTIES**

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒&nbsp;&nbsp;&nbsp;&nbsp;No fee required

☐&nbsp;&nbsp;&nbsp;&nbsp;Fee paid previously with preliminary materials

☐&nbsp;&nbsp;&nbsp;&nbsp;Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

------

![coptdefenseproperties_vxna.jpg](coptdefenseproperties_vxna.jpg)

------

![coptdefenseproperties_vxnaa.jpg](coptdefenseproperties_vxnaa.jpg)

<br>