ADAGE CAPITAL PARTNERS GP, L.L.C.

Position in AJG — Arthur J. Gallagher & Co.

CIK 1165408 Boston, MA

Position in AJG

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$73,802,450

+$32,447,032 QoQ

Shares Held

340,763

+113.2% QoQ

Ownership

0.133%

of shares outstanding

% of Portfolio

0.12%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Financial Services · as of Mar 31, 2026

ADAGE CAPITAL PARTNERS GP, L.L.C. holds $249,052,310 across 5 Insurance Brokers names. AJG ranks #1 (29.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	AJG	Arthur J. Gallagher & Co. This page	340,763	$73,802,450
2	AON	Aon plc	222,169	$71,711,709
3	MRSH	Marsh & Mclennan Companies, Inc.	353,661	$61,342,500
4	WTW	Willis Towers Watson PLC	120,188	$34,938,651
5	NP	Neptune Insurance Holdings Inc.	300,000	$7,257,000

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$73,802,450	340,763	+113.2%	Shares	Sole	2026-05-15
2025-12-31	$41,355,418	159,803	-45.5%	Shares	Sole	2026-02-17
2025-09-30	$90,785,723	293,103	-40.7%	Shares	Sole	2025-11-14
2025-06-30	$158,332,312	494,603	+72.3%	Shares	Sole	2025-08-14
2025-03-31	$99,119,439	287,103	-29.7%	Shares	Sole	2025-05-15
2024-12-31	$115,925,191	408,403	+323.2%	Shares	Sole	2025-02-14
2024-09-30	$27,153,049	96,503	-58.0%	Shares	Sole	2024-11-14
2024-06-30	$59,538,353	229,603	+113.4%	Shares	Sole	2024-08-14
2024-03-31	$26,905,054	107,603	-46.1%	Shares	Sole	2024-05-15
2023-12-31	$44,909,210	199,703	-39.4%	Shares	Sole	2024-02-14
2023-09-30	$75,058,032	329,303	-59.5%	Shares	Sole	2023-11-14
2023-06-30	$178,598,896	813,403	+15.8%	Shares	Other	2023-08-14
2023-03-31	$134,376,717	702,403	-31.4%	Shares	Sole	2023-05-15
2022-12-31	$193,140,941	1,024,403	+27.4%	Shares	Sole	2023-02-14
2022-09-30	$137,712,759	804,303	+2.0%	Shares	Sole	2022-11-14
2022-06-30	$128,606,441	788,803	-31.3%	Shares	Sole	2022-08-15
2022-03-31	$200,388,943	1,147,703	+18.2%	Shares	Sole	2022-05-16
2021-12-31	$164,733,112	970,903	+10.4%	Shares	Sole	2022-02-14
2021-09-30	$130,693,525	879,203	+101.0%	Shares	Sole	2021-11-15
2021-06-30	$61,271,412	437,403	+20.6%	Shares	Sole	2021-08-16
2021-03-31	$45,266,930	362,803	-21.5%	Shares	Sole	2021-05-17
2020-12-31	$57,142,020	461,903	-27.2%	Shares	Sole	2021-02-16
2020-09-30	$66,948,594	634,103	-6.9%	Shares	Sole	2020-11-16
2020-06-30	$66,390,982	681,003	-22.7%	Shares	Sole	2020-08-14
2020-03-31	$71,785,857	880,700	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.