CDP

SEC source: 0001415889-23-014997 · form4-11132023_041118.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 199,764

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: 0001415889-23-014932 · form4-11092023_051146.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 200,764

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: 0001415889-23-012255 · form4-08152023_070831.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 201,764

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 Corporate Office 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 Corporate Office 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: 0001415889-23-008487 · form4-05222023_070538.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 203,264

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 Corporate Office 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 Corporate Office 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: 0001415889-23-008260 · form4-05182023_050553.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,523

SEC source: 0001415889-23-008055 · form4-05152023_090559.xml · nonDerivative · entry 1

Trimberger Lisa G · CIK 0001718603 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,220

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

SEC source: 0001415889-23-008053 · form4-05152023_090546.xml · derivative · entry 1

PICKETT C TAYLOR · CIK 0001143567 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,298

Underlying: Common Shares · 4,523 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.

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 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 · 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: 0001415889-23-008051 · form4-05152023_090505.xml · derivative · entry 1

Owens Raymond Lee · CIK 0001397459 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,880

Underlying: Common Shares · 4,523 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.

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 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 · 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: 0001415889-23-008049 · form4-05152023_090534.xml · nonDerivative · entry 1

Miller Essye B. · CIK 0001947703 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,353

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: 0001415889-23-008046 · form4-05152023_090518.xml · derivative · entry 1

Long Letitia A · CIK 0001637178 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,880

Underlying: Common Shares · 4,523 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.

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 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 · 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: 0001415889-23-008042 · form4-05152023_090554.xml · nonDerivative · entry 1

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,032

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: 0001415889-23-008039 · form4-05152023_090515.xml · derivative · entry 1

HAWKINS PHILIP L · CIK 0001234375 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,298

Underlying: Common Shares · 4,523 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.

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 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 · 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: 0001415889-23-008037 · form4-05152023_090553.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,464

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: 0001415889-23-008035 · form4-05152023_080500.xml · nonDerivative · entry 1

BRADY THOMAS F · CIK 0001050747 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,876

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: 0001415889-23-007098 · form4-05022023_080501.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 204,764

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 Corporate Office 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 2,000Common 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 Corporate Office 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 2,000Common 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: 0001415889-23-005358 · form4-03232023_080302.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 206,764

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 Corporate Office 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 2,000Common 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 Corporate Office 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 2,000Common 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: 0001415889-23-004485 · form4-03082023_090331.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 208,764

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 Corporate Office 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 7,000Common 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 Corporate Office 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 7,000Common 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: 0001415889-23-015796 · form4a-12052023_021240.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,374

F1 · shares: On March 3, 2023, incorrectly reported grant as 2,624 Profit Interest Units, should have been reported as a restricted share grant.

F2 · price: Received as employment compensation.

SEC source: 0001415889-23-003978 · form4-03032023_060341.xml · derivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,624

Underlying: Common Shares · 2,624 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.

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 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.

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

SEC source: 0001415889-23-003976 · form4-03032023_060354.xml · derivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 143,538

Underlying: Common Shares · 16,666 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.

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 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.

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

SEC source: 0001415889-23-003974 · form4-03032023_060345.xml · derivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · PRESIDENT /CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 446,568

Underlying: Common Shares · 54,238 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.

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 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.

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

SEC source: 0001415889-23-003971 · form4-03032023_060335.xml · derivative · entry 1

Hartman Todd W. · CIK 0001834053 · EVP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,666

Underlying: Common Shares · 16,666 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.

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 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.

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

F4 · balance_after: As reported in the Current Report on Form 8-K filed by Corporate Office Properties Trust on March 2, 2023, the reporting person resigned from the company effective March 2, 2023. At that time, all of the reporting person's outstanding, unvested performance-based or time-based equity grants (including the 16,666 Profit Interest Units granted on March 1, 2023) were terminated.

SEC source: 0001415889-23-003518 · form4-02282023_100249.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 215,764

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 Corporate Office 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 Corporate Office 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: 0001415889-23-002352 · form4-02132023_090233.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,264

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 Corporate Office 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 Corporate Office 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.

SEC source: 0001415889-23-001715 · form4-02012023_080203.xml · derivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · PRESIDENT /CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 392,330

Underlying: Common Shares · 105,546 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: 0001415889-23-001714 · form4-02012023_080217.xml · derivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 126,872

Underlying: Common Shares · 35,606 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.

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

SEC source: 0001415889-22-011107 · form4-11072022_061122.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 221,264

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 Corporate Office 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 Corporate Office 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: 0001415889-22-010259 · form4-10042022_021047.xml · nonDerivative · entry 1

Miller Essye B. · CIK 0001947703 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,830

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

SEC source: 0001415889-22-009886 · form4-09232022_060935.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 223,264

Underlying: Common Shares · 1,250 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 1,250 common units of limited partnership interest ("Common Units") of Corporate Office 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 1,250 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 1,250 common units of limited partnership interest ("Common Units") of Corporate Office 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 1,250 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: 0001415889-22-008663 · form4-08162022_070803.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 224,514

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 Corporate Office 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 Corporate Office 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: 0001415889-22-006506 · form4-06132022_020644.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 226,514

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 Corporate Office 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 Corporate Office 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: 0001415889-22-006148 · form4-06062022_120624.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 227,514

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 Corporate Office 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 Corporate Office 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.

SEC source: 0001415889-22-005266 · form4-05192022_070540.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,941

SEC source: 0001415889-22-005062 · form4-05162022_020550.xml · derivative · entry 1

HAWKINS PHILIP L · CIK 0001234375 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,775

Underlying: Common Shares · 3,941 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.

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 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 · 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: 0001415889-22-005060 · form4-05162022_020550.xml · derivative · entry 1

Long Letitia A · CIK 0001637178 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,357

Underlying: Common Shares · 3,941 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.

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 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 · 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: 0001415889-22-005058 · form4-05162022_020538.xml · derivative · entry 1

PICKETT C TAYLOR · CIK 0001143567 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,775

Underlying: Common Shares · 3,941 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.

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 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 · 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: 0001415889-22-005056 · form4-05162022_020553.xml · nonDerivative · entry 1

BRADY THOMAS F · CIK 0001050747 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,353

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: 0001415889-22-005054 · form4-05162022_020526.xml · nonDerivative · entry 1

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,509

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: 0001415889-22-005052 · form4-05162022_020557.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,357

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: 0001415889-22-005050 · form4-05162022_020507.xml · nonDerivative · entry 1

Trimberger Lisa G · CIK 0001718603 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,697

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

SEC source: 0001415889-22-005047 · form4-05162022_020527.xml · derivative · entry 1

Owens Raymond Lee · CIK 0001397459 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,357

Underlying: Common Shares · 3,941 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.

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 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 · 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: 0001415889-22-004493 · form4-05032022_090550.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 231,514

Underlying: Common Shares · 1,000 shares

Expires not disclosed

F1 · kind: The reporting person redeemed 1,000 common units of limited partnership interest ("Common Units") of Corporate Office 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 Corporate Office 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: 0001415889-22-003470 · form4-03302022_120308.xml · nonDerivative · entry 2

Thor Greg J · CIK 0001370086 · SVP--CAO & CONTROLLER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,096

SEC source: 0001415889-22-003470 · form4-03302022_120308.xml · nonDerivative · entry 1

Thor Greg J · CIK 0001370086 · SVP--CAO & CONTROLLER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,096

SEC source: 0001179110-22-002261 · edgar.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 232,514

Underlying: Common Shares · 3,000 shares

Expires not disclosed

F1 · kind: The reporting person redeemed 3,000 common units of limited partnership interest ("Common Units") of Corporate Office 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 Corporate Office 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: 0001415889-22-002623 · form4-03072022_060318.xml · derivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 235,514

Underlying: Common Shares · 3,000 shares

Expires not disclosed

F1 · kind: The reporting person redeemed 3,000 common units of limited partnership interest ("Common Units") of Corporate Office 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 Corporate Office 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: 0001179110-22-001932 · edgar.xml · nonDerivative · entry 4

Thor Greg J · CIK 0001370086 · SVP--CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,429

F2 · price: These restricted common shares, shall lapse equally over a 3 year period.

SEC source: 0001179110-22-001932 · edgar.xml · nonDerivative · entry 3

Thor Greg J · CIK 0001370086 · SVP--CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,628

F1 · price: These shares were forfeited in a net share settlement in connection with restrictions lapsing on restricted shares.

SEC source: 0001179110-22-001932 · edgar.xml · nonDerivative · entry 2

Thor Greg J · CIK 0001370086 · SVP--CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,384

F1 · price: These shares were forfeited in a net share settlement in connection with restrictions lapsing on restricted shares.

SEC source: 0001179110-22-001932 · edgar.xml · nonDerivative · entry 1

Thor Greg J · CIK 0001370086 · SVP--CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,141

F1 · price: These shares were forfeited in a net share settlement in connection with restrictions lapsing on restricted shares.