DONNELLY WILLIAM P

SEC source: 0001207928-26-000011 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,365

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the third quarter of 2026.

SEC source: 0001207928-26-000010 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,347.7371

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001207928-26-000009 · primarydocument.xml · derivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,802 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.

F2 · derivative.exercise_date: On August 17, 2023, the reporting person was granted 8,238 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

F2 · derivative.expiration_date: On August 17, 2023, the reporting person was granted 8,238 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

SEC source: 0001207928-26-000009 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 162,401

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 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001207928-26-000008 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 99,400

F3 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.85 to $3.13, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F2 · ownership.nature: Owned jointly by trusts established by the reporting person and his spouse.

SEC source: 0001207928-26-000008 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 27,155

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.58 to $2.95, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F2 · ownership.nature: Owned jointly by trusts established by the reporting person and his spouse.

SEC source: 0001207928-26-000007 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,305

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the second quarter of 2026.

SEC source: 0001207928-26-000006 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,183.7445

F2 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, Stock Units were issued for Director Fee Awards at $113.69 per share, the closing price of TROW shares on June 30, 2026. The Stock Unit Shares and any future dividends attributed to such Director Fee Award, will vest in full and become nonforfeitable on the date of grant.

SEC source: 0001207928-26-000006 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,607.7445

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001207928-26-000005 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,466.06

F1 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, this Restricted Stock Unit shares was issued at $105.33 per share, the closing price of TROW shares on May 8, 2026. The forfeiture provisions of the Stock Unit Shares and all accrued dividends attributed to such Stock Unit Shares, will vest in full and become nonforfeitable upon the earliest of the following dates: (a) the day immediately prior to the Annual Meeting that occurs in the next calendar year following the year in which the Award Shares were granted as reflected on the Notice, (b) date of death, (c) the date on which it has been determined that the award holder suffered, a Total and Permanent Disability, or (d) the date on which a Change in Control occurs, in which case the vesting will take place immediately before and contingent upon the occurrence of the Change in Control.

SEC source: 0001207928-26-000004 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 154,127

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the first quarter of 2026.

SEC source: 0001207928-26-000003 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,567.06

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001140361-26-007392 · form4.xml · derivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,029 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: Represents restricted stock units originally granted on February 26, 2025, which vested on February 26, 2026 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.exercise_date: Represents restricted stock units originally granted on February 26, 2025, which vested on February 26, 2026 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.expiration_date: Represents restricted stock units originally granted on February 26, 2025, which vested on February 26, 2026 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001140361-26-007392 · form4.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,831

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 · price: Represents restricted stock units originally granted on February 26, 2025, which vested on February 26, 2026 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001140361-26-006845 · form4.xml · derivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,927

Underlying: Common Stock · 2,927 shares

Expires not disclosed

F1 · derivative.exercise_price: These restricted stock units vest on February 23, 2027 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.exercise_date: These restricted stock units vest on February 23, 2027 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.expiration_date: These restricted stock units vest on February 23, 2027 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001207928-26-000002 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,751

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.

F2 · balance_after: Includes 2,802 restricted stock units.

SEC source: 0001207928-26-000001 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,414.9823

SEC source: 0001207928-26-000001 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,793.9823

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001207928-25-000005 · primarydocument.xml · derivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,091

Underlying: Common Stock · 70,091 shares

Expires 2035-11-20

F1 · derivative.exercise_date: The stock options vest monthly over two years in 24 equal installments, subject to the Reporting Person's provision of service to the Issuer on each vesting date.

SEC source: 0001207928-25-000004 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,374

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the third quarter of 2025.

F2 · price: Closing price of the Company's common stock on the Nasdaq Global Market on October 1, 2025.

F3 · balance_after: Includes 12,955 restricted stock units.

SEC source: 0001207928-25-000003 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,675.4201

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001562180-25-005253 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 143,298

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the second quarter of 2025.

F2 · price: Closing price of the Company's common stock on the Nasdaq Global Market on July 1, 2025.

F3 · balance_after: Includes 12,955 restricted stock units.

SEC source: 0001562180-25-005157 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,558.1591

F2 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, Stock Units were issued for Director Fee Awards at $96.50 per share, the closing price of TROW shares on June 30, 2025. The Stock Unit Shares and any future dividends attributed to such Director Fee Award, will vest in full and become nonforfeitable on the date of grant.

SEC source: 0001562180-25-005157 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,888.1591

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001562180-25-004655 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,094

F1 · price: This transaction was executed in multiple trades at prices ranging from $5.345 to $5.5224. The price reported reflects the weighted average purchase price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes 12,955 restricted stock units.

SEC source: 0001562180-25-003749 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,772.2306

F1 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, this Restricted Stock Unit shares was issued at $92.74 per share, the closing price of TROW shares on May 9, 2025. The forfeiture provisions of the Stock Unit Shares and all accrued dividends attributed to such Stock Unit Shares, will vest in full and become nonforfeitable upon the earliest of the following dates: (a) the day immediately prior to the Annual Meeting that occurs in the next calendar year following the year in which the Award Shares were granted as reflected on the Notice, (b) date of death, (c) the date on which it has been determined that the award holder suffered, a Total and Permanent Disability, or (d) the date on which a Change in Control occurs, in which case the vesting will take place immediately before and contingent upon the occurrence of the Change in Control.

SEC source: 0001562180-25-002979 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,981

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the first quarter of 2025.

F2 · price: Closing price of the Company's common stock on the Nasdaq Global Market on April 1, 2025.

F3 · balance_after: Includes 12,955 restricted stock units.

SEC source: 0001562180-25-002790 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,615.2306

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001140361-25-006602 · form4.xml · derivative · entry 3

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,793 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: Represents restricted stock units originally granted on February 27, 2024, which vested on February 27, 2025 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.exercise_date: Represents restricted stock units originally granted on February 27, 2024, which vested on February 27, 2025 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.expiration_date: Represents restricted stock units originally granted on February 27, 2024, which vested on February 27, 2025 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001140361-25-006602 · form4.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,802

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 · price: Represents restricted stock units originally granted on February 27, 2024, which vested on February 27, 2025 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001140361-25-006602 · form4.xml · derivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,029

Underlying: Common Stock · 3,029 shares

Expires not disclosed

F2 · derivative.exercise_price: These restricted stock units vest on February 26, 2026 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F2 · derivative.exercise_date: These restricted stock units vest on February 26, 2026 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F2 · derivative.expiration_date: These restricted stock units vest on February 26, 2026 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001562180-25-000199 · primarydocument.xml · derivative · entry 3

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,821

Underlying: Common Stock · 15,821 shares

Expires 2035-01-02

F5 · shares: Represents non-qualified stock option to purchase 15,821 shares of common stock granted pursuant to the Quanterix Corporation Amended and Restated Non-Employee Director Compensation Policy.

SEC source: 0001562180-25-000199 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,300

F3 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2024.

F4 · price: Closing price of the Company's common stock on the Nasdaq Global Market on January 2, 2025.

F2 · balance_after: Includes 12,955 restricted stock units.

SEC source: 0001562180-25-000199 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,018

F1 · shares: Represents restricted stock units that vest as to 100% of the shares on December 31, 2025 granted pursuant to the Quanterix Corporation Amended and Restated Non-Employee Director Compensation Policy. Each restricted stock unit represents the right to receive one share of the Issuer's common stock.

F2 · balance_after: Includes 12,955 restricted stock units.

SEC source: 0001562180-24-008619 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,524.7379

F2 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, Stock Units were issued for Director Fee Awards at $113.86 per share, the closing price of TROW shares on December 30 2024. The Stock Unit Shares and any future dividends attributed to such Director Fee Award, will vest in full and become nonforfeitable on the date of grant.

SEC source: 0001562180-24-008619 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,983.7379

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001140361-24-048703 · form4.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,009

F1 · kind: Reflects charitable donations.

SEC source: 0001562180-24-007126 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,583

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the third quarter of 2024.

F2 · price: Closing price of the Company's common stock on the Nasdaq Global Market on October 1, 2024.

F3 · balance_after: Includes 11,185 restricted stock units.

SEC source: 0001562180-24-006977 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,920.2717

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001562180-24-005535 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,583

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the second quarter of 2024.

F2 · price: Closing price of the Company's common stock on the Nasdaq Global Market on July 1, 2024.

F3 · balance_after: Includes 11,185 restricted stock units.

SEC source: 0001562180-24-005379 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,853.986

F2 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, Stock Units were issued for Director Fee Awards at $115.31 per share, the closing price of TROW shares on June 28 2024. The Stock Unit Shares and any future dividends attributed to such Director Fee Award, will vest in full and become nonforfeitable on the date of grant.

SEC source: 0001562180-24-005379 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,293.986

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001562180-24-003928 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,237.7201

F1 · shares: Pursuant to the 2017 Non-Employee Director Equity Plan, this restricted Stock Unit shares was issued at $111.49 per share, the closing price of TROW shares on May 8, 2024. The forfeiture provisions of the Stock Unit Shares and all accrued dividends attributed to such Stock Unit Shares, will vest in full and become nonforfeitable upon the earliest of the following dates: (a) the day immediately prior to the Annual Meeting that occurs in the next calendar year following the year in which the Award Shares were granted as reflected on the Notice, (b) date of death, (c) the date on which it has been determined that the award holder suffered, a Total and Permanent Disability, or (d) the date on which a Change in Control occurs, in which case the vesting will take place immediately before and contingent upon the occurrence of the Change in Control.

SEC source: 0001562180-24-003240 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,598

F1 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the first quarter of 2024.

F2 · price: Closing price of the Company's common stock on the Nasdaq Global Market on April 1, 2024.

F3 · balance_after: Includes 11,185 restricted stock units.

SEC source: 0001562180-24-003060 · primarydocument.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,443.7201

F1 · shares: This is pursuant to the T. Rowe Price Group, Inc. 2017 Non-Employee Director Equity Plan with respect to dividends declared by the issuer on it's Common Stock. A portion of these shares were credited as fully-vested dividend reinvestment shares and a portion will be accrued and vest when the corresponding grant vests.

SEC source: 0001140361-24-010535 · form4.xml · derivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,793

Underlying: Common Stock · 2,793 shares

Expires not disclosed

F1 · derivative.exercise_price: These restricted stock units vest on February 27, 2025 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.exercise_date: These restricted stock units vest on February 27, 2025 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.expiration_date: These restricted stock units vest on February 27, 2025 and upon vesting, will each be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001140361-24-009586 · form4.xml · derivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,059 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: Represents restricted stock units originally granted on February 23, 2023, which vested on February 23, 2024 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.exercise_date: Represents restricted stock units originally granted on February 23, 2023, which vested on February 23, 2024 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

F1 · derivative.expiration_date: Represents restricted stock units originally granted on February 23, 2023, which vested on February 23, 2024 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001140361-24-009586 · form4.xml · nonDerivative · entry 1

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,884

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 · price: Represents restricted stock units originally granted on February 23, 2023, which vested on February 23, 2024 and upon vesting, were to be settled by delivery of one share of common stock, an equivalent amount of cash, or a combination thereof.

SEC source: 0001562180-24-000229 · primarydocument.xml · derivative · entry 3

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,412

Underlying: Common Stock · 6,412 shares

Expires 2034-01-02

F5 · shares: Represents non-qualified stock option to purchase 6,412 shares of common stock granted pursuant to the Quanterix Corporation Amended and Restated Non-Employee Director Compensation Policy.

SEC source: 0001562180-24-000229 · primarydocument.xml · nonDerivative · entry 2

DONNELLY WILLIAM P · CIK 0001207928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,073

F3 · shares: Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2023.

F4 · price: Closing price of the Company's common stock on the Nasdaq Global Market on January 2, 2024.

F2 · balance_after: Includes 11,185 restricted stock units.