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Bay Walter D.

Disclosed activity across 1 company

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19684
SEC CIK
0001410235

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Arthur J. Gallagher & Co.AJG · Entity 990General CounselAugust 24, 2026August 26, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Arthur J. Gallagher & Co.

Report date August 24, 2026 · Filed August 26, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect71,292.092 Reported balance After 2026-08-24 transaction · row 1
1 source row

Row 1 · 2026-08-24 · Sale · Disposed 12,000 · Balance 71,292.092

F1: The price reported is an average weighted price. The shares were sold in multiple transactions on 8/24/2026 at prices ranging from $270.01 to $270.17. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Common StockSEC Table I · non-derivativeIndirectGallagher 401(k) plan account491.129 Reported balance Holding disclosure · report date 2026-08-24 · row 2 Holding and transaction disclosures are not merged.
1 source row

Row 2 · Balance 491.129

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $127.90 · Expires 2028-03-16Direct24,500 Reported balance Holding disclosure · report date 2026-08-24 · row 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · Balance 24,500

F2: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $86.17 · Expires 2027-03-12Direct17,630 Reported balance Holding disclosure · report date 2026-08-24 · row 4 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 4 · Balance 17,630

F2: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $228.20 · Expires 2033-03-01Direct16,952 Reported balance Holding disclosure · report date 2026-08-24 · row 5 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 5 · Balance 16,952

F3: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $158.56 · Expires 2029-03-15Direct11,405 Reported balance Holding disclosure · report date 2026-08-24 · row 6 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 6 · Balance 11,405

F2: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $337.74 · Expires 2032-03-01Direct11,350 Reported balance Holding disclosure · report date 2026-08-24 · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · Balance 11,350

F4: Closing price of Gallagher common stock on February 28, 2025.

F2: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $243.54 · Expires 2031-03-01Direct10,884 Reported balance Holding disclosure · report date 2026-08-24 · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · Balance 10,884

F5: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Non-qualified Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $177.09 · Expires 2030-03-15Direct9,452 Reported balance Holding disclosure · report date 2026-08-24 · row 9 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 9 · Balance 9,452

F6: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Notional Stock UnitsSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct5,828.5456 Reported balance Holding disclosure · report date 2026-08-24 · row 10 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 10 · Balance 5,828.5456

F7: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F8: The notional stock units become payable in July 2026 and following the reporting person's separation from service with Gallagher.

Phantom StockSEC Table II · derivative / convertible securityDirect4,007.175 Reported balance Holding disclosure · report date 2026-08-24 · row 11 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 11 · Balance 4,007.175

F9: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F10: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Filing footnotes · ownership attribution and instrument terms

F1: The price reported is an average weighted price. The shares were sold in multiple transactions on 8/24/2026 at prices ranging from $270.01 to $270.17. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F3: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F4: Closing price of Gallagher common stock on February 28, 2025.

F5: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F6: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

F7: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F8: The notional stock units become payable in July 2026 and following the reporting person's separation from service with Gallagher.

F9: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F10: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
August 24, 2026 Filed Aug 26, 2026 23:34 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 12,000 $270.08 $3,240,972.00
Disclosure

SEC source: 0000354190-26-000199 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,292.092

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 8/24/2026 at prices ranging from $270.01 to $270.17. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
March 31, 2026 Filed Apr 2, 2026 00:02 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionPhantom Stock · Derivative 1,415.092 $0.00 $0.00
Disclosure

SEC source: 0000354190-26-000114 · form4.xml · derivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,994.734

Underlying: Common Stock · 1,415.092 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_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F3 · derivative.exercise_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

F3 · derivative.expiration_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Read SEC document
March 31, 2026 Filed Apr 2, 2026 00:02 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 627 $215.95 $135,400.65
Disclosure

SEC source: 0000354190-26-000114 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,292.092

F1 · balance_after: The transactions in this report relate solely to the distribution of vested shares under the Age 62 Plan and the withholding of shares to cover applicable income and employment taxes.

Read SEC document
March 31, 2026 Filed Apr 2, 2026 00:02 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 1,415.092 $215.95 $305,589.12
Disclosure

SEC source: 0000354190-26-000114 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,919.092

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.

Read SEC document
March 15, 2026 Filed Mar 18, 2026 01:16 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 2,411 $207.93 $501,319.23
Disclosure

SEC source: 0000354190-26-000075 · form4.xml · nonDerivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,414

Read SEC document
March 15, 2026 Filed Mar 18, 2026 01:16 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 7,090 $0.00 $0.00
Disclosure

SEC source: 0000354190-26-000075 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,504

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.

Read SEC document
March 15, 2026 Filed Mar 18, 2026 01:16 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock (restricted) 7,090 $0.00 $0.00
Disclosure

SEC source: 0000354190-26-000075 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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.

Read SEC document
March 15, 2026 Filed Mar 18, 2026 01:16 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GrantCommon Stock (restricted) 7,090 $0.00 $0.00
Disclosure

SEC source: 0000354190-26-000075 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,090

F1 · shares: Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026.

Read SEC document
March 04, 2026 Filed Mar 7, 2026 01:30 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GrantPhantom Stock · Derivative 1,982.292 $227.01 $450,000.11
Disclosure

SEC source: 0000354190-26-000058 · form4.xml · derivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,399.1

Underlying: Common Stock · 1,982.292 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · derivative.exercise_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

F2 · derivative.expiration_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 23:41 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GrantNon-qualified Stock Option · Derivative 16,952 $0.00 Strike: $228.20 $0.00
Disclosure

SEC source: 0000354190-26-000016 · form4.xml · derivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,952

Underlying: Common Stock · 16,952 shares

Expires 2033-03-01

F1 · derivative.exercise_date: One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Read SEC document
December 19, 2025 Filed Dec 24, 2025 00:31 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionNon-qualified Stock Option · Derivative 15,850 $0.00 Strike: $79.59 $0.00
Disclosure

SEC source: 0000354190-25-000056 · form4.xml · derivative · entry 13

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 15,850 shares

Expires 2026-03-14

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.

F3 · derivative.exercise_date: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Read SEC document
December 19, 2025 Filed Dec 24, 2025 00:31 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GiftCommon Stock 1,724 $0.00 $0.00
Disclosure

SEC source: 0000354190-25-000056 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,825

Read SEC document
December 19, 2025 Filed Dec 24, 2025 00:31 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 15,850 $255.00 $4,041,750.00
Disclosure

SEC source: 0000354190-25-000056 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,549

Read SEC document
December 19, 2025 Filed Dec 24, 2025 00:31 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 15,850 $79.59 $1,261,501.50
Disclosure

SEC source: 0000354190-25-000056 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,399

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.

Read SEC document
March 31, 2025 Filed Apr 3, 2025 01:40 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionPhantom Stock · Derivative 78.755 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-011274 · form4.xml · derivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,395.152

Underlying: Common Stock · 78.755 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: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · derivative.exercise_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

F2 · derivative.expiration_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Read SEC document
March 31, 2025 Filed Apr 3, 2025 01:40 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 78.755 $345.24 $27,189.38
Disclosure

SEC source: 0001127602-25-011274 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,470.245

Read SEC document
March 31, 2025 Filed Apr 3, 2025 01:40 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 78.755 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-011274 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,549

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.

Read SEC document
March 15, 2025 Filed Mar 18, 2025 22:29 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 3,108 $325.24 $1,010,845.92
Disclosure

SEC source: 0001127602-25-009865 · form4.xml · nonDerivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,549

Read SEC document
March 15, 2025 Filed Mar 18, 2025 22:29 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 7,180 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-009865 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,657

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.

Read SEC document
March 15, 2025 Filed Mar 18, 2025 22:29 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock (restricted) 7,180 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-009865 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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.

Read SEC document
March 15, 2025 Filed Mar 18, 2025 22:29 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GrantCommon Stock (restricted) 7,180 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-009865 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,180

F1 · shares: Performance share units (awarded on March 15, 2022) earned and vested as of March 15, 2025.

Read SEC document
March 12, 2025 Filed Mar 14, 2025 23:41 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 945 $325.75 $307,833.75
Disclosure

SEC source: 0001127602-25-009549 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,477

Read SEC document
March 12, 2025 Filed Mar 14, 2025 23:41 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 2,250 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-009549 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,422

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.

Read SEC document
March 12, 2025 Filed Mar 14, 2025 23:41 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock (restricted) 2,250 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-009549 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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.

Read SEC document
March 10, 2025 Filed Mar 12, 2025 00:40 UTC Arthur J. Gallagher & Co. AJG · Entity 990 OtherPhantom Stock · Derivative 1,400.866 $321.23 $450,000.19
Disclosure

SEC source: 0001127602-25-009177 · form4.xml · derivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,470.264

Underlying: Common Stock · 1,400.866 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · derivative.exercise_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

F2 · derivative.expiration_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Read SEC document
March 01, 2025 Filed Mar 6, 2025 02:22 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GrantNon-qualified Stock Option · Derivative 11,350 $0.00 Strike: $337.74 $0.00
Disclosure

SEC source: 0001127602-25-008470 · form4.xml · derivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,350

Underlying: Common Stock · 11,350 shares

Expires 2032-03-01

F1 · derivative.exercise_price: Closing price of Gallagher common stock on February 28, 2025.

F2 · derivative.exercise_date: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Read SEC document
February 13, 2025 Filed Feb 14, 2025 21:11 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 10,000 $326.62 $3,266,200.00
Disclosure

SEC source: 0001127602-25-004896 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,172

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $326.58 to $326.70 The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
February 05, 2025 Filed Feb 8, 2025 02:04 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionPhantom Stock · Derivative 94,731.841 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-003688 · form4.xml · derivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,069.398

Underlying: Common Stock · 94,731.841 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: Each share of phantom stock represents a right to receive one share of Gallagher common stock.

F2 · derivative.exercise_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

F2 · derivative.expiration_date: These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards in the year they attain age 62, or after a one-year period for participants who have attained age 61.

Read SEC document
February 05, 2025 Filed Feb 8, 2025 02:04 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 40,612.841 $316.30 $12,845,841.61
Disclosure

SEC source: 0001127602-25-003688 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,172

Read SEC document
February 05, 2025 Filed Feb 8, 2025 02:04 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 94,731.841 $0.00 $0.00
Disclosure

SEC source: 0001127602-25-003688 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 124,784.841

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.

Read SEC document
December 10, 2024 Filed Dec 11, 2024 16:40 UTC Arthur J. Gallagher & Co. AJG · Entity 990 OtherNotional Stock Units · Derivative 4,942.4 $283.74 Strike: $0.00 $1,402,356.58
Disclosure

SEC source: 0001127602-24-029073 · form4.xml · derivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,942.4

Underlying: Common Stock · 4,942.4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F2 · shares: Acquisition arising from the reporting person's reallocation of funds held in the Supplemental Savings and Thrift Plan into the fund representing Gallagher common stock.

F3 · derivative.exercise_date: The notional stock units become payable following the reporting person's separation from service with Gallagher.

F3 · derivative.expiration_date: The notional stock units become payable following the reporting person's separation from service with Gallagher.

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July 30, 2024 Filed Jul 30, 2024 22:09 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 6,335 $284.06 $1,799,530.24
Disclosure

SEC source: 0001127602-24-021201 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,053

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June 18, 2024 Filed Jun 18, 2024 22:48 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 8,303 $262.74 $2,181,546.83
Disclosure

SEC source: 0001127602-24-018930 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,388

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 6/18/2024 at prices ranging from $262.39 to $263.32. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

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June 17, 2024 Filed Jun 18, 2024 22:48 UTC Arthur J. Gallagher & Co. AJG · Entity 990 OtherNotional Stock Units · Derivative 9,675.47 $261.16 Strike: $0.00 $2,526,845.75
Disclosure

SEC source: 0001127602-24-018930 · form4.xml · derivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 9,675.47 shares

Expires not disclosed

F2 · derivative.exercise_price: Each notional stock unit represents a right to receive one share of Gallagher common stock.

F3 · shares: This exempt disposition of notional stock units reflects a reallocation of amounts previously deferred pursuant to the Supplemental Savings and Thrift Plan out of the investment option representing Gallagher common stock.

F4 · derivative.exercise_date: The notional stock units become payable following the reporting person's separation from service with Gallagher.

F4 · derivative.expiration_date: The notional stock units become payable following the reporting person's separation from service with Gallagher.

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May 20, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionNon-qualified Stock Option · Derivative 800 $0.00 Strike: $70.74 $0.00
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · derivative · entry 13

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 800 shares

Expires 2025-03-15

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: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

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May 20, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 800 $257.24 $205,792.00
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 9

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,691

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May 20, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 800 $70.74 $56,592.00
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 8

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,491

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.

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May 17, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionNon-qualified Stock Option · Derivative 8,717 $0.00 Strike: $70.74 $0.00
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · derivative · entry 12

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 800

Underlying: Common Stock · 8,717 shares

Expires 2025-03-15

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: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

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May 17, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 386 $258.11 $99,630.46
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 7

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,691

F4 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/17/2024 at prices ranging from $258.05 to $258.16.

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May 17, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 4,468 $257.53 $1,150,644.04
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 6

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,077

F3 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/17/2024 at prices ranging from $257.01 to $257.97.

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May 17, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 3,863 $256.27 $989,971.01
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 5

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,545

F2 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/17/2024 at prices ranging from $256.00 to $256.92. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4.

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May 17, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 8,717 $70.74 $616,640.58
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,408

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.

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May 16, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionNon-qualified Stock Option · Derivative 7,283 $0.00 Strike: $70.74 $0.00
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · derivative · entry 11

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,517

Underlying: Common Stock · 7,283 shares

Expires 2025-03-15

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: One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

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May 16, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 7,283 $256.04 $1,864,739.32
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,691

F1 · price: The price reported is an average weighted price. The shares were sold in multiple transactions on 5/16/2024 at prices ranging from $256.00 to $256.28. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

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May 16, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 7,283 $70.74 $515,199.42
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,550

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.

Read SEC document
May 16, 2024 Filed May 21, 2024 00:42 UTC Arthur J. Gallagher & Co. AJG · Entity 990 SaleCommon Stock 7,576 $253.00 $1,916,728.00
Disclosure

SEC source: 0001127602-24-016050 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,974

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March 16, 2024 Filed Mar 20, 2024 00:37 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Tax withholdingCommon Stock 3,858 $253.17 $976,729.86
Disclosure

SEC source: 0001127602-24-010715 · form4.xml · nonDerivative · entry 4

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,267

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March 16, 2024 Filed Mar 20, 2024 00:37 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock 8,914 $0.00 $0.00
Disclosure

SEC source: 0001127602-24-010715 · form4.xml · nonDerivative · entry 3

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,125

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.

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March 16, 2024 Filed Mar 20, 2024 00:37 UTC Arthur J. Gallagher & Co. AJG · Entity 990 Exercise / conversionCommon Stock (restricted) 8,914 $0.00 $0.00
Disclosure

SEC source: 0001127602-24-010715 · form4.xml · nonDerivative · entry 2

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,250

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.

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March 16, 2024 Filed Mar 20, 2024 00:37 UTC Arthur J. Gallagher & Co. AJG · Entity 990 GrantCommon Stock (restricted) 8,914 $0.00 $0.00
Disclosure

SEC source: 0001127602-24-010715 · form4.xml · nonDerivative · entry 1

Bay Walter D. · CIK 0001410235 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,164

F1 · shares: Performance share units (awarded on March 16, 2021) earned and vested as of March 16, 2024.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.