AMT

SEC source: 0001053507-26-000149 · wk-form4_1791230827.xml · nonDerivative · entry 1

Blanchett Paul · CIK 0001875774 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,299

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2026 Equity Incentive Plan and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000139 · wk-form4_1787689396.xml · nonDerivative · entry 1

Kalathur Rajesh · CIK 0001555586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,765

SEC source: 0001053507-26-000135 · wk-form4_1785442264.xml · nonDerivative · entry 2

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,711

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025.

SEC source: 0001053507-26-000137 · wk-form4_1785528506.xml · nonDerivative · entry 1

Meyer Robert Joseph · CIK 0001363889 · SVP & Advisor to the CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,428

F1 · balance_after: Includes 142 shares acquired under the issuer's employee stock purchase plan in May 2026.

SEC source: 0001053507-26-000135 · wk-form4_1785442264.xml · nonDerivative · entry 1

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,817

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025.

F2 · balance_after: Includes 41 shares acquired under the issuer's employee stock purchase plan in May 2026.

SEC source: 0001053507-26-000125 · wk-form4_1780517871.xml · nonDerivative · entry 1

Meyer Robert Joseph · CIK 0001363889 · SVP & Advisor to the CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,286

F1 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of restricted stock units previously granted under the 2007 Equity Incentive Plan, as amended.

SEC source: 0001053507-26-000121 · wk-form4_1780345711.xml · nonDerivative · entry 1

REEVE PAMELA D A · CIK 0001032946 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,089

F1 · kind: Shares gifted to a charitable organization.

SEC source: 0001053507-26-000105 · wk-form4_1777580207.xml · nonDerivative · entry 2

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,461

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025.

SEC source: 0001053507-26-000105 · wk-form4_1777580207.xml · nonDerivative · entry 1

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,877

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025.

SEC source: 0001053507-26-000082 · wk-form4_1773348258.xml · nonDerivative · entry 3

Rossi Richard C · CIK 0002053262 · EVP & President, U.S. Tower

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,518

F3 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000080 · wk-form4_1773348211.xml · nonDerivative · entry 3

Font Juan · CIK 0001733553 · SVP, Pres. & CEO, CoreSite

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,352

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000078 · wk-form4_1773348168.xml · nonDerivative · entry 3

Smith Rodney M · CIK 0001807541 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,542

F3 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000076 · wk-form4_1773348112.xml · nonDerivative · entry 3

Meyer Robert Joseph · CIK 0001363889 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,439

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000074 · wk-form4_1773348048.xml · nonDerivative · entry 3

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,433

F3 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000072 · wk-form4_1773347933.xml · nonDerivative · entry 3

Noel Eugene M · CIK 0002000070 · EVP & Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,542

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000070 · wk-form4_1773347882.xml · nonDerivative · entry 3

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,902

F3 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000066 · wk-form4_1773347740.xml · nonDerivative · entry 1

MACNAB CRAIG · CIK 0001020280 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,315

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000082 · wk-form4_1773348258.xml · nonDerivative · entry 2

Rossi Richard C · CIK 0002053262 · EVP & President, U.S. Tower

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,202

F3 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000082 · wk-form4_1773348258.xml · nonDerivative · entry 1

Rossi Richard C · CIK 0002053262 · EVP & President, U.S. Tower

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,746

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

F2 · balance_after: Includes 80 and 40 shares acquired under the issuer's employee stock purchase plan in May 2025 and November 2025, respectively.

SEC source: 0001053507-26-000080 · wk-form4_1773348211.xml · nonDerivative · entry 2

Font Juan · CIK 0001733553 · SVP, Pres. & CEO, CoreSite

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,280

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000080 · wk-form4_1773348211.xml · nonDerivative · entry 1

Font Juan · CIK 0001733553 · SVP, Pres. & CEO, CoreSite

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,114

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000078 · wk-form4_1773348168.xml · nonDerivative · entry 2

Smith Rodney M · CIK 0001807541 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,837

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan.

SEC source: 0001053507-26-000078 · wk-form4_1773348168.xml · nonDerivative · entry 1

Smith Rodney M · CIK 0001807541 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,270

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000076 · wk-form4_1773348112.xml · nonDerivative · entry 2

Meyer Robert Joseph · CIK 0001363889 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,123

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000076 · wk-form4_1773348112.xml · nonDerivative · entry 1

Meyer Robert Joseph · CIK 0001363889 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,491

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000074 · wk-form4_1773348048.xml · nonDerivative · entry 2

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,296

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan.

SEC source: 0001053507-26-000074 · wk-form4_1773348048.xml · nonDerivative · entry 1

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,925

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000072 · wk-form4_1773347933.xml · nonDerivative · entry 2

Noel Eugene M · CIK 0002000070 · EVP & Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,261

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

SEC source: 0001053507-26-000072 · wk-form4_1773347933.xml · nonDerivative · entry 1

Noel Eugene M · CIK 0002000070 · EVP & Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,759

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000070 · wk-form4_1773347882.xml · nonDerivative · entry 2

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,060

F2 · kind: Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan.

SEC source: 0001053507-26-000070 · wk-form4_1773347882.xml · nonDerivative · entry 1

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 126,329

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000064 · wk-form4_1773347695.xml · nonDerivative · entry 2

Kalathur Rajesh · CIK 0001555586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,936

SEC source: 0001053507-26-000064 · wk-form4_1773347695.xml · nonDerivative · entry 1

Kalathur Rajesh · CIK 0001555586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,265

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000068 · wk-form4_1773347832.xml · nonDerivative · entry 1

Chambliss Kelly C · CIK 0001684464 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,426

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000062 · wk-form4_1773347642.xml · nonDerivative · entry 1

HORMATS ROBERT D · CIK 0001029613 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,597

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000061 · wk-form4_1773347562.xml · nonDerivative · entry 1

Clarke Teresa Hillary · CIK 0001875332 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,307

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000059 · wk-form4_1773347512.xml · nonDerivative · entry 1

REEVE PAMELA D A · CIK 0001032946 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,899

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000058 · wk-form4_1773347427.xml · nonDerivative · entry 1

Ray Neville R · CIK 0001576185 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,265

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000057 · wk-form4_1773347315.xml · nonDerivative · entry 1

REILLY EUGENE F · CIK 0001266076 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,898

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000052 · wk-form4_1773346648.xml · nonDerivative · entry 1

Lieblein Grace · CIK 0001564342 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,141

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000055 · wk-form4_1773346784.xml · nonDerivative · entry 1

Tanner Bruce L · CIK 0001411075 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,940

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000050 · wk-form4_1773346583.xml · nonDerivative · entry 1

Frank Kenneth R · CIK 0001841379 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,188

F1 · shares: These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

SEC source: 0001053507-26-000045 · wk-form4_1772832182.xml · derivative · entry 5

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 33,482 shares

Expires 2026-03-10

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.

F5 · derivative.exercise_date: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2017.

SEC source: 0001053507-26-000045 · wk-form4_1772832182.xml · nonDerivative · entry 4

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 105,374

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2025.

F4 · price: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $189.58 to $190.09 per share.

SEC source: 0001053507-26-000045 · wk-form4_1772832182.xml · nonDerivative · entry 3

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 107,147

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2025.

F3 · price: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $188.31 to $189.30 per share.

SEC source: 0001053507-26-000045 · wk-form4_1772832182.xml · nonDerivative · entry 2

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 123,772

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2025.

F2 · price: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $187.31 to $188.30 per share.

SEC source: 0001053507-26-000045 · wk-form4_1772832182.xml · nonDerivative · entry 1

Vondran Steven O · CIK 0001749304 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 138,856

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.

SEC source: 0001053507-26-000043 · wk-form4_1772831875.xml · nonDerivative · entry 1

Dowling Ruth T · CIK 0001960785 · EVP, Chief Admin Ofr, GC & Sec

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 31,047

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025.

SEC source: 0002000070-26-000002 · wk-form4_1772659236.xml · derivative · entry 6

Noel Eugene M · CIK 0002000070 · EVP & Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 41,209 shares

Expires 2026-03-10

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.

F7 · derivative.exercise_date: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2017.

SEC source: 0002000070-26-000002 · wk-form4_1772659236.xml · nonDerivative · entry 5

Noel Eugene M · CIK 0002000070 · EVP & Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,592

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2025.

F6 · price: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $191.92 to $192.19 per share.