ADAGE CAPITAL PARTNERS GP, L.L.C.

Position in MRSH — Marsh & Mclennan Companies, Inc.

CIK 1165408 Boston, MA

Position in MRSH

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

Position Value

$61,342,500

+$28,077,757 QoQ

Shares Held

353,661

+114.3% QoQ

Ownership

0.073%

of shares outstanding

% of Portfolio

0.10%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

24 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. MRSH ranks #3 (24.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	AJG	Arthur J. Gallagher & Co.	340,763	$73,802,450
2	AON	Aon plc	222,169	$71,711,709
3	MRSH	Marsh & Mclennan Companies, Inc. This page	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

24 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$61,342,500	353,661	+114.3%	Shares	Sole	2026-05-15
2025-09-30	$33,264,743	165,061	+58.3%	Shares	Sole	2025-11-14
2025-06-30	$22,795,625	104,261	-70.9%	Shares	Sole	2025-08-14
2025-03-31	$87,328,819	357,861	-3.1%	Shares	Sole	2025-05-15
2024-12-31	$78,413,488	369,161	-59.4%	Shares	Sole	2025-02-14
2024-09-30	$202,690,873	908,561	+186.0%	Shares	Sole	2024-11-14
2024-06-30	$66,937,525	317,661	-17.0%	Shares	Sole	2024-08-14
2024-03-31	$78,799,914	382,561	-41.5%	Shares	Sole	2024-05-15
2023-12-31	$123,905,990	653,961	-17.3%	Shares	Sole	2024-02-14
2023-09-30	$150,557,938	791,161	+60.5%	Shares	Sole	2023-11-14
2023-06-30	$92,697,296	492,861	-0.6%	Shares	Other	2023-08-14
2023-03-31	$82,552,339	495,661	-21.9%	Shares	Sole	2023-05-15
2022-12-31	$104,990,606	634,461	-29.8%	Shares	Sole	2023-02-14
2022-09-30	$134,877,692	903,461	+121.6%	Shares	Sole	2022-11-14
2022-06-30	$63,304,895	407,761	-52.2%	Shares	Sole	2022-08-15
2022-03-31	$145,242,319	852,261	+71.1%	Shares	Sole	2022-05-16
2021-12-31	$86,572,963	498,061	+0.3%	Shares	Sole	2022-02-14
2021-09-30	$75,209,375	496,661	-6.2%	Shares	Sole	2021-11-15
2021-06-30	$74,484,573	529,461	+28.3%	Shares	Sole	2021-08-16
2021-03-31	$50,274,289	412,761	+43.1%	Shares	Sole	2021-05-17
2020-12-31	$33,738,237	288,361	-43.1%	Shares	Sole	2021-02-16
2020-09-30	$58,150,491	506,979	+2.3%	Shares	Sole	2020-11-16
2020-06-30	$53,188,843	495,379	+2.0%	Shares	Sole	2020-08-14
2020-03-31	$41,991,806	485,679	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.