LOOMIS SAYLES & CO L P

Position in TMO — Thermo Fisher Scientific Inc.

CIK 312348 BOSTON, MA

Back to TMO Full portfolio

Position in TMO

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$670,327,969

-$128,425,892 QoQ

Shares Held

1,363,758

-1.1% QoQ

Ownership

0.367%

of shares outstanding

% of Portfolio

0.93%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 83.07419644834347.ToString("F0")% Shared 0.ToString("F0")% None 16.925803551656525.ToString("F0")%

Common Shares in TMO Over Time

Shares Held

Position Value (USD)

Position in Diagnostics & Research

Healthcare · as of Mar 31, 2026

LOOMIS SAYLES & CO L P holds $1,412,201,549 across 13 Diagnostics & Research names. TMO ranks #1 (47.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	TMO	Thermo Fisher Scientific Inc. This page	1,363,758	$670,327,969
2	ILMN	Illumina, Inc.	2,942,977	$362,751,344
3	MTD	Mettler Toledo International Inc/	107,446	$135,510,895
4	DHR	Danaher Corp /De/	556,853	$105,579,328
5	RDNT	RadNet, Inc.	686,215	$38,352,556
6	CRL	Charles River Laboratories International, Inc.	170,982	$29,494,394
7	NTRA	Natera, Inc.	142,019	$28,402,379
8	TWST	Twist Bioscience Corp	492,290	$23,393,620

All Filings in TMO

Export CSV

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$670,327,969	1,363,758	-1.1%	Shares	Defined	2026-05-14
2025-12-31	$798,753,861	1,378,469	-2.4%	Shares	Defined	2026-02-12
2025-09-30	$685,179,508	1,412,683	-0.1%	Shares	Defined	2025-11-13
2025-06-30	$573,479,379	1,414,392	+5.0%	Shares	Defined	2025-08-13
2025-03-31	$670,257,247	1,346,980	+7.5%	Shares	Defined	2025-05-14
2024-12-31	$652,031,830	1,253,353	-3.4%	Shares	Defined	2025-02-12
2024-09-30	$802,911,281	1,298,012	-1.8%	Shares	Defined	2024-11-13
2024-06-30	$731,156,139	1,322,163	+14.3%	Shares	Defined	2024-08-13
2024-03-31	$672,471,012	1,157,019	+0.1%	Shares	Defined	2024-05-14
2023-12-31	$613,229,117	1,155,314	+18.7%	Shares	Defined	2024-02-13
2023-09-30	$492,802,556	973,591	+17046.7%	Shares	Defined	2023-11-09
2023-06-30	$2,962,496	5,678	-6.5%	Shares	Defined	2023-08-11
2023-03-31	$3,500,294	6,073	+2.5%	Shares	Defined	2023-05-15
2022-12-31	$3,262,286	5,924	+48.8%	Shares	Defined	2023-02-10
2022-09-30	$2,018,615	3,980	-77.1%	Shares	Defined	2022-11-14
2022-06-30	$9,446,008	17,387	-12.4%	Shares	Defined	2022-08-05
2022-03-31	$11,720,857	19,844	+563.5%	Shares	Defined	2022-05-13
2021-12-31	$1,995,714	2,991	-16.2%	Shares	Defined	2022-02-14
2021-09-30	$2,040,219	3,571	-9.8%	Shares	Defined	2021-11-12
2021-06-30	$1,997,700	3,960	+10.9%	Shares	Defined	2021-08-13
2021-03-31	$1,629,732	3,571	+7.5%	Shares	Defined	2021-05-17
2020-12-31	$1,546,855	3,321	+463.8%	Shares	Defined	2021-02-12
2020-09-30	$260,055	589	+314.8%	Shares	Defined	2020-11-12
2020-06-30	$51,452	142	-4.7%	Shares	Defined	2020-08-14
2020-03-31	$42,256	149	—	Shares	Defined	2020-05-15
No filing history on record for this holder in this stock.