CDP

SEC source: 0001179110-21-001343 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 223,432

F1 · price: Received as employment compensation upon satisfaction of the performance criteria for performance-based share units awarded on January 1, 2018.

SEC source: 0001179110-21-003771 · edgar.xml · nonDerivative · entry 7

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,152

F1 · shares: Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter. The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares.

F2 · balance_after: Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person.

SEC source: 0001179110-21-000048 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 151,772

SEC source: 0001179110-20-012272 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 151,189

SEC source: 0001179110-20-012228 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 150,724

SEC source: 0001179110-20-012205 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 150,138

SEC source: 0001179110-20-012157 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,594

SEC source: 0001179110-20-012123 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,046

SEC source: 0001179110-20-011845 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,463

SEC source: 0001179110-20-011827 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,149

SEC source: 0001179110-20-011804 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 147,834

SEC source: 0001179110-20-011568 · edgar.xml · derivative · entry 1

Hartman Todd W. · CIK 0001834053 · EVP & COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,265

Underlying: Common Shares · 23,265 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 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 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 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 over five (5) years.

SEC source: 0001179110-20-011395 · edgar.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,994

SEC source: 0001179110-20-011195 · edgar.xml · nonDerivative · entry 2

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,986

SEC source: 0001179110-20-011195 · edgar.xml · derivative · entry 3

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 260,568

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 · derivative.exercise_price: 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. The issuer elected to issue common shares upon the conversation of the reporting person's Common Units. Common Units have no expiration date.

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. The issuer elected to issue common shares upon the conversation of the reporting person's Common Units. 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. The issuer elected to issue common shares upon the conversation of the reporting person's Common Units. Common Units have no expiration date.

SEC source: 0001179110-20-011195 · edgar.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,986

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. The issuer elected to issue common shares upon the conversation of the reporting person's Common Units. Common Units have no expiration date.

F1 · price: 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. The issuer elected to issue common shares upon the conversation of the reporting person's Common Units. Common Units have no expiration date.

SEC source: 0001179110-21-003771 · edgar.xml · nonDerivative · entry 6

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,152

F1 · shares: Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter. The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares.

F2 · balance_after: Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person.

SEC source: 0001179110-20-010241 · edgar.xml · nonDerivative · entry 1

Long Letitia A · CIK 0001637178 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,707

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

SEC source: 0001179110-20-009943 · edgar.xml · nonDerivative · entry 1

PICKETT C TAYLOR · CIK 0001143567 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,986

SEC source: 0001179110-20-009711 · edgar.xml · nonDerivative · entry 1

PICKETT C TAYLOR · CIK 0001143567 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,986

SEC source: 0001179110-20-009121 · edgar.xml · nonDerivative · entry 1

JACOBSTEIN DAVID M · CIK 0001191856 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,151

SEC source: 0001179110-21-003771 · edgar.xml · nonDerivative · entry 5

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,152

F1 · shares: Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter. The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares.

F3 · shares: The purchases by the reporting person on October 14, 2019, January 14, 2020, April 14, 2020 and July 14, 2020 were within six months of the sale by the reporting person on February 14, 2020 of 1,000 common shares at a price per share of $30.00. As a result, such purchases were matchable with such sale under Section 16(b) of the Securities Exchange Act of 1934, as amended. The reporting person has disgorged $70.71 to the issuer, representing the full amount of the profit realized in connection with such short swing transactions.

F2 · balance_after: Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person.

SEC source: 0001179110-20-006843 · edgar.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 266,554

SEC source: 0001179110-20-006798 · edgar.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 268,270

SEC source: 0001179110-20-006591 · edgar.xml · nonDerivative · entry 1

Trimberger Lisa G · CIK 0001718603 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,340

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

SEC source: 0001179110-20-006589 · edgar.xml · derivative · entry 1

PICKETT C TAYLOR · CIK 0001143567 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,418

Underlying: Common Shares · 3,986 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.

F5 · 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.

F3 · 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.

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.

F4 · derivative.expiration_date: The Profit Interest Units do not expire once vested.

SEC source: 0001179110-20-006588 · edgar.xml · derivative · entry 1

HAWKINS PHILIP L · CIK 0001234375 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,418

Underlying: Common Shares · 3,986 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.

F5 · 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.

F3 · 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.

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.

F4 · derivative.expiration_date: The Profit Interest Units do not expire once vested.

SEC source: 0001179110-20-006587 · edgar.xml · nonDerivative · entry 1

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,152

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

SEC source: 0001179110-20-006586 · edgar.xml · nonDerivative · entry 1

JACOBSTEIN DAVID M · CIK 0001191856 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,551

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

SEC source: 0001179110-20-006585 · edgar.xml · nonDerivative · entry 1

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 269,986

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

SEC source: 0001179110-20-006584 · edgar.xml · nonDerivative · entry 1

BRADY THOMAS F · CIK 0001050747 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,996

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

SEC source: 0001179110-21-003771 · edgar.xml · nonDerivative · entry 4

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,152

F1 · shares: Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter. The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares.

F3 · shares: The purchases by the reporting person on October 14, 2019, January 14, 2020, April 14, 2020 and July 14, 2020 were within six months of the sale by the reporting person on February 14, 2020 of 1,000 common shares at a price per share of $30.00. As a result, such purchases were matchable with such sale under Section 16(b) of the Securities Exchange Act of 1934, as amended. The reporting person has disgorged $70.71 to the issuer, representing the full amount of the profit realized in connection with such short swing transactions.

F2 · balance_after: Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person.

SEC source: 0001179110-20-004016 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 147,520

SEC source: 0001179110-20-003838 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 146,045

SEC source: 0001179110-20-002797 · edgar.xml · derivative · entry 3

Mifsud Anthony · CIK 0001349211 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,176

Underlying: Common Shares · 13,513 shares

Expires not disclosed

F2 · 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.

F3 · shares: Represents Profit Interest Units issued pursuant to the Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan.

F2 · 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.

F4 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F2 · 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.

F4 · derivative.expiration_date: The Profit Interest Units will vest in three equal installments over a three-year period.

SEC source: 0001179110-20-002797 · edgar.xml · nonDerivative · entry 2

Mifsud Anthony · CIK 0001349211 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,819

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

SEC source: 0001179110-20-002797 · edgar.xml · nonDerivative · entry 1

Mifsud Anthony · CIK 0001349211 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,225

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

SEC source: 0001179110-20-002801 · edgar.xml · derivative · entry 3

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,685

Underlying: Common Shares · 40,055 shares

Expires not disclosed

F2 · 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.

F3 · shares: Represents Profit Interest Units issued pursuant to the Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan.

F2 · 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.

F4 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F2 · 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.

F4 · derivative.expiration_date: The Profit Interest Units will vest in three equal installments over a three-year period.

SEC source: 0001179110-20-002801 · edgar.xml · nonDerivative · entry 2

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 143,515

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

SEC source: 0001179110-20-002801 · edgar.xml · nonDerivative · entry 1

BUDORICK STEPHEN E · CIK 0001169452 · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,059

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

SEC source: 0001179110-20-002799 · edgar.xml · derivative · entry 3

Adkins Paul R · CIK 0001691425 · Executive Vice President &COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,176

Underlying: Common Shares · 13,513 shares

Expires not disclosed

F2 · 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.

F3 · shares: Represents Profit Interest Units issued pursuant to the Corporate Office Properties Trust 2017 Omnibus Equity and Incentive Plan.

F2 · 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.

F4 · derivative.exercise_date: The Profit Interest Units will vest in three equal installments over a three-year period.

F2 · 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.

F4 · derivative.expiration_date: The Profit Interest Units will vest in three equal installments over a three-year period.

SEC source: 0001179110-20-002799 · edgar.xml · nonDerivative · entry 2

Adkins Paul R · CIK 0001691425 · Executive Vice President &COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,513

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

SEC source: 0001179110-20-002799 · edgar.xml · nonDerivative · entry 1

Adkins Paul R · CIK 0001691425 · Executive Vice President &COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,644

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

SEC source: 0001179110-20-002795 · edgar.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,434

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

SEC source: 0001179110-20-002795 · edgar.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,619

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

SEC source: 0001179110-20-002795 · edgar.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,337

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

SEC source: 0001179110-20-002795 · edgar.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,048

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

SEC source: 0001179110-20-001728 · edgar.xml · nonDerivative · entry 1

KESLER STEVEN D · CIK 0001073344 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,166

SEC source: 0001179110-20-001487 · edgar.xml · nonDerivative · entry 3

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,432

SEC source: 0001179110-20-001487 · edgar.xml · nonDerivative · entry 2

DENTON ROBERT L · CIK 0001250536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,432

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.

F2 · price: Acquired through the conversion of COPLP Units.