VIKING GLOBAL INVESTORS LP

Position in TMO — Thermo Fisher Scientific Inc.

CIK 1103804 STAMFORD, CT

Position in TMO

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

Position Value

$819,884,328

+$360,272,121 QoQ

Shares Held

1,668,025

+110.3% QoQ

Ownership

0.449%

of shares outstanding

% of Portfolio

2.35%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

18 quarters on record

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

Healthcare · as of Mar 31, 2026

VIKING GLOBAL INVESTORS LP holds $1,610,371,378 across 3 Diagnostics & Research names. TMO ranks #1 (50.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	TMO	Thermo Fisher Scientific Inc. This page	1,668,025	$819,884,328
2	ADPT	Adaptive Biotechnologies Corp	29,993,708	$416,312,667
3	WAT	Waters Corp /De/	1,256,462	$374,174,383

18 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$819,884,328	1,668,025	+110.3%	Shares	Sole	2026-05-15
2025-12-31	$459,612,207	793,187	+517.3%	Shares	Sole	2026-02-17
2024-03-31	$74,679,091	128,489	-76.1%	Shares	Sole	2024-05-15
2023-12-31	$285,822,453	538,485	-40.1%	Shares	Sole	2024-02-14
2023-09-30	$455,408,741	899,715	+8.0%	Shares	Sole	2023-11-14
2023-06-30	$434,739,317	833,233	-2.8%	Shares	Sole	2023-08-14
2023-03-31	$493,854,565	856,836	+2.1%	Shares	Sole	2023-05-15
2022-12-31	$462,318,572	839,526	+41.4%	Shares	Sole	2023-02-14
2022-09-30	$301,036,031	593,537	-31.2%	Shares	Sole	2022-11-14
2022-06-30	$468,626,265	862,587	+78.0%	Shares	Sole	2022-08-15
2022-03-31	$286,285,692	484,696	+129.7%	Shares	Sole	2022-05-16
2021-12-31	$140,826,339	211,058	+15.8%	Shares	Sole	2022-05-16
2021-09-30	$104,117,465	182,237	-82.0%	Shares	Sole	2022-05-16
2021-06-30	$510,221,462	1,011,401	+17.3%	Shares	Sole	2021-08-16
2021-03-31	$393,347,989	861,887	+1007.6%	Shares	Sole	2021-05-17
2020-12-31	$36,245,602	77,817	-94.3%	Shares	Sole	2021-02-16
2020-09-30	$608,071,498	1,377,223	-20.6%	Shares	Sole	2020-11-16
2020-06-30	$628,349,736	1,734,144	—	Shares	Sole	2020-08-07
No filing history on record for this holder in this stock.