Douglass Winthrop Advisors, LLC

CIK

1308527

City

NEW YORK

State / Country

Stock

AON — Aon plc

Top Portfolio Positions

257 positions · $4,755,269,194 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
BRK-B	Berkshire Hathaway Inc Financial Services	874,970	$419,285,624	8.82%
MSFT	Microsoft Corp Technology	715,013	$264,676,362	5.57%
AMZN	Amazon Com Inc Consumer Cyclical	1,235,231	$257,261,560	5.41%
MA	Mastercard Inc Financial Services	377,294	$188,518,720	3.96%
COST	Costco Wholesale Corp /New Consumer Defensive	188,814	$188,139,934	3.96%
AAPL	Apple Inc. Technology	722,635	$183,397,536	3.86%
DE	Deere & Co Industrials	321,034	$180,838,452	3.80%
UBER	Uber Technologies, Inc Technology	2,249,740	$161,823,798	3.40%
MKL	Markel Group Inc. Financial Services	80,498	$154,078,798	3.24%
FAST	Fastenal Co Industrials	3,116,146	$144,589,174	3.04%

25 quarters · across all stocks

25 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$127,348,330	394,536	+0.5%	Shares	Sole	2026-05-14
2025-12-31	$138,545,981	392,615	-2.3%	Shares	Sole	2026-02-12
2025-09-30	$143,309,502	401,900	+1.2%	Shares	Sole	2025-11-13
2025-06-30	$141,664,758	397,087	+8.0%	Shares	Sole	2025-08-14
2025-03-31	$146,745,393	367,700	-1.2%	Shares	Sole	2025-05-14
2024-12-31	$133,622,963	372,043	-0.1%	Shares	Sole	2025-02-11
2024-09-30	$128,853,249	372,419	+1.5%	Shares	Sole	2024-11-12
2024-06-30	$107,749,731	367,020	+2.9%	Shares	Sole	2024-08-07
2024-03-31	$119,043,930	356,718	+0.7%	Shares	Sole	2024-05-13
2023-12-31	$103,130,503	354,376	+0.3%	Shares	Sole	2024-02-12
2023-09-30	$114,535,902	353,266	+0.6%	Shares	Sole	2023-11-13
2023-06-30	$121,165,545	351,001	-0.1%	Shares	Sole	2023-08-14
2023-03-31	$110,804,256	351,436	+0.7%	Shares	Sole	2023-05-15
2022-12-31	$104,741,656	348,976	+0.5%	Shares	Sole	2023-02-13
2022-09-30	$93,028,036	347,288	+0.4%	Shares	Sole	2022-11-15
2022-06-30	$93,250,489	345,782	+0.1%	Shares	Sole	2022-08-11
2022-03-31	$112,479,440	345,421	+0.6%	Shares	Sole	2022-05-16
2021-12-31	$103,167,821	343,252	+0.3%	Shares	Sole	2022-02-14
2021-09-30	$97,779,063	342,160	+4.1%	Shares	Sole	2021-11-10
2021-06-30	$78,495,215	328,762	+4.7%	Shares	Sole	2021-08-02
2021-03-31	$72,223,245	313,864	+45.8%	Shares	Sole	2021-05-13
2020-12-31	$45,478,825	215,264	+3676.6%	Shares	Sole	2021-01-27
2020-09-30	$1,175,910	5,700	-8.1%	Shares	Sole	2020-11-12
2020-06-30	$1,194,120	6,200	+10.9%	Shares	Sole	2020-07-17
2020-03-31	$923,068	5,593	—	Shares	Sole	2020-04-23
No 13F history on record for this holder in this stock.