CDP

SEC source: 0001415889-25-006594 · form4-03042025_100306.xml · derivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP AND CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 276,634

Underlying: Common Shares · 18,779 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

SEC source: 0001415889-25-006592 · form4-03042025_100314.xml · nonDerivative · entry 3

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,810

F1 · price: Received as employment compensation.

SEC source: 0001415889-25-006592 · form4-03042025_100314.xml · nonDerivative · entry 2

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,146

SEC source: 0001415889-25-006592 · form4-03042025_100314.xml · nonDerivative · entry 1

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,430

SEC source: 0001415889-25-005676 · form4-02262025_090257.xml · nonDerivative · entry 1

Snider Britt A. · CIK 0002002965 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,000

SEC source: 0001415889-25-004399 · form4-02182025_090231.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 162,264

Underlying: Common Shares · 1,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-25-003544 · form4-02112025_030204.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 163,264

Underlying: Common Shares · 6,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 6,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 6,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 6,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 6,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-25-002453 · form4-01312025_080119.xml · derivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 822,032

Underlying: Common Shares · 154,097 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

SEC source: 0001415889-25-002451 · form4-01312025_080104.xml · derivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP AND CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 257,855

Underlying: Common Shares · 46,974 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

SEC source: 0001415889-24-028445 · form4-12062024_021209.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,264

Underlying: Common Shares · 1,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-028099 · form4-12032024_091201.xml · nonDerivative · entry 2

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,784

SEC source: 0001415889-24-028099 · form4-12032024_091201.xml · nonDerivative · entry 1

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,284

SEC source: 0001415889-24-026804 · form4-11142024_041100.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 170,764

Underlying: Common Shares · 1,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-026411 · form4-11082024_061130.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 153,882

SEC source: 0001415889-24-026355 · form4-11072024_101126.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 162,736

SEC source: 0001415889-24-026207 · form4-11062024_021153.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,736

SEC source: 0001415889-24-026097 · form4-11052024_061127.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 180,736

SEC source: 0001415889-24-025812 · form4-10312024_031006.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,764

Underlying: Common Shares · 1,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-023185 · form4-09112024_010928.xml · nonDerivative · entry 1

Snider Britt A. · CIK 0002002965 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

SEC source: 0001415889-24-022751 · form4-09042024_070924.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 173,264

Underlying: Common Shares · 1,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-021342 · form4-08152024_060802.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 174,764

Underlying: Common Shares · 1,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-020412 · form4-07312024_060740.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 176,264

Underlying: Common Shares · 2,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 2,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 2,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-016329 · form4-06112024_060647.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 178,264

Underlying: Common Shares · 1,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 1,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-013206 · form4-05152024_080552.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,398

SEC source: 0001415889-24-013027 · form4-05132024_080521.xml · derivative · entry 1

PICKETT C TAYLOR · CIK 0001143567 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,696

Underlying: Common Shares · 4,398 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties , exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F4 · price: Issued as compensation for service on the Board of Trustees.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties , exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · derivative.exercise_date: The Profit Interest Units will vest on the first anniversary of the grant date, provided that the reporting person remains a trustee on such date.

F3 · derivative.expiration_date: The Profit Interest Units do not expire once vested.

SEC source: 0001415889-24-013023 · form4-05132024_080514.xml · derivative · entry 1

HAWKINS PHILIP L · CIK 0001234375 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,696

Underlying: Common Shares · 4,398 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F4 · price: Issued as compensation for service on the Board of Trustees.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · derivative.exercise_date: The Profit Interest Units will vest on the first anniversary of the grant date, provided that the reporting person remains a trustee on such date.

F3 · derivative.expiration_date: The Profit Interest Units do not expire once vested.

SEC source: 0001415889-24-013020 · form4-05132024_080528.xml · derivative · entry 1

Owens Raymond Lee · CIK 0001397459 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,278

Underlying: Common Shares · 4,398 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties Trust, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F4 · price: Issued as compensation for service on the Board of Trustees

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties Trust, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · derivative.exercise_date: The Profit Interest Units will vest on the first anniversary of the grant date, provided that the reporting person remains a trustee on such date.

F3 · derivative.expiration_date: The Profit Interest Units do not expire once vested.

SEC source: 0001415889-24-013016 · form4-05132024_080532.xml · derivative · entry 1

Long Letitia A · CIK 0001637178 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,278

Underlying: Common Shares · 4,398 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F4 · price: Issued as compensation for service on the Board of Trustees.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · derivative.exercise_date: The Profit Interest Units will vest on the first anniversary of the grant date, provided that the reporting person remains a trustee on such date.

F3 · derivative.expiration_date: The Profit Interest Units do not expire once vested.

SEC source: 0001415889-24-013011 · form4-05132024_080521.xml · nonDerivative · entry 1

Miller Essye B. · CIK 0001947703 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,751

F1 · price: These restricted shares were granted as part of annual trustee compensation and will vest upon Mrs. Miller's cessation of being a trustee.

SEC source: 0001415889-24-013008 · form4-05132024_080520.xml · nonDerivative · entry 1

BRADY THOMAS F · CIK 0001050747 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,274

F1 · price: The deferred shares were granted as part of annual trustee compensation and will vest upon Mr. Brady's cessation of being a trustee

SEC source: 0001415889-24-013003 · form4-05132024_080546.xml · nonDerivative · entry 1

Trimberger Lisa G · CIK 0001718603 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,261

F1 · price: These restricted shares were granted as part of annual trustee compensation and will vest in one year from the grant.

SEC source: 0001415889-24-013006 · form4-05132024_080531.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,921

F1 · price: These restricted shares were granted as part of annual trustee compensation and will vest in one year from the grant date.

SEC source: 0001415889-24-008269 · form4-03182024_080333.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 179,264

Underlying: Common Shares · 2,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 2,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 2,500 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,500 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-006785 · form4-03052024_100340.xml · derivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP AND CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 210,881

Underlying: Common Shares · 17,836 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.expiration_date: The Profit Interest Units will vest in three equal installments over a three-year period.

SEC source: 0001415889-24-006783 · form4-03052024_100315.xml · derivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 667,935

Underlying: Common Shares · 66,482 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.expiration_date: The Profit Interest Units will vest in three equal installments over a three-year period.

SEC source: 0001415889-24-006777 · form4-03052024_100336.xml · derivative · entry 1

Snider Britt A. · CIK 0002002965 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,972

Underlying: Common Shares · 13,498 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of COPT Defense Properties, exchangeable for common shares of COPT Defense Properties, currently on a one-for-one basis.

F3 · derivative.expiration_date: The Profit Interest Units will vest in three equal installments over a three-year period.

SEC source: 0001415889-24-006772 · form4-03052024_100319.xml · nonDerivative · entry 2

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,534

F1 · price: Received as employment compensation.

SEC source: 0001415889-24-006772 · form4-03052024_100319.xml · nonDerivative · entry 1

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,786

SEC source: 0001415889-24-005831 · form4-02292024_080231.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,764

Underlying: Common Shares · 2,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 2,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 2,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-004534 · form4-02212024_020252.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 183,764

Underlying: Common Shares · 3,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 3,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 3,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 3,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 3,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-003481 · form4-02132024_020257.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 186,764

Underlying: Common Shares · 7,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 7,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 7,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 7,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 7,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-24-002459 · form4-02052024_060229.xml · derivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP AND CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 193,045

Underlying: Common Shares · 49,507 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties L.P. when such Profit Interest Unit becomes vested and upon equalization of it's capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

SEC source: 0001415889-24-002457 · form4-02052024_060207.xml · derivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · Director · PRESIDENT/CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 601,453

Underlying: Common Shares · 154,885 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in Corporate Office Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

SEC source: 0001415889-23-016797 · form4-12202023_101238.xml · nonDerivative · entry 1

Trimberger Lisa G · CIK 0001718603 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,863

F1 · price: Represents the weighted average of a range of sale prices from $25.41 to $25.68.

SEC source: 0001415889-23-016725 · form4-12192023_091217.xml · nonDerivative · entry 1

Snider Britt A. · CIK 0002002965 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,000

SEC source: 0001415889-23-016441 · form4-12142023_051204.xml · nonDerivative · entry 1

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,313

SEC source: 0001415889-23-016007 · form4-12082023_071255.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 193,764

Underlying: Common Shares · 2,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 2,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 2,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 2,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

SEC source: 0001415889-23-015785 · form4-12042023_101258.xml · derivative · entry 1

Snider Britt A. · CIK 0002002965 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,474

Underlying: Common Shares · 23,474 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F2 · shares: Represents Profit Interest Units issued pursuant to the COPT Defense Properties 2017 Omnibus Equity and Incentive Plan.

F4 · price: Issued as employment compensation.

F1 · derivative.exercise_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F3 · derivative.exercise_date: The Profit Interest Units will vest over five (5) years.

F1 · derivative.expiration_date: Each Profit Interest Unit will convert automatically into one share of beneficial interest, designated as a unit (an "OP Unit"), in COPT Defense Properties, L.P. when such Profit Interest Unit becomes vested and upon equalization of its capital account balance. OP Units are redeemable for cash, or, at the option of Corporate Office Properties Trust, exchangeable for common shares of Corporate Office Properties Trust, currently on a one-for-one basis.

F3 · derivative.expiration_date: The Profit Interest Units will vest over five (5) years.

SEC source: 0001415889-23-015798 · form4-12052023_021221.xml · nonDerivative · entry 1

Myers Matthew T · CIK 0001965764 · SVP-CAO & CONTROLLER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,124

SEC source: 0001415889-23-015319 · form4-11212023_031151.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 195,764

Underlying: Common Shares · 4,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The reporting person redeemed 4,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 4,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.

F2 · derivative.exercise_date: Common Units are convertible upon issuance.

F1 · derivative.expiration_date: The reporting person redeemed 4,000 common units of limited partnership interest ("Common Units") of COPT Defense Properties, L.P., of which the issuer is the general partner. Common Units are convertible into an equal number of the issuer's common shares of beneficial interest or, at the election of the issuer, cash equal to the fair market value of such shares. In the case of these 4,000 Common Units, the issuer elected to pay cash upon the conversion of the reporting person's Common Units, based on the 10-day average closing price of the issuer's common shares on the New York Stock Exchange. Common Units have no expiration date.