LOOMIS SAYLES & CO L P

Position in REGN — Regeneron Pharmaceuticals, Inc.

CIK 312348 BOSTON, MA

Back to REGN Full portfolio

Position in REGN

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

Position Value

$1,477,527,197

-$15,521,011 QoQ

Shares Held

1,912,310

-1.1% QoQ

Ownership

1.82%

of shares outstanding

% of Portfolio

2.06%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 82.76294115493826.ToString("F0")% Shared 0.ToString("F0")% None 17.237058845061732.ToString("F0")%

Common Shares in REGN Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Mar 31, 2026

LOOMIS SAYLES & CO L P holds $4,075,180,510 across 25 Biotechnology names. REGN ranks #2 (36.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	VRTX	Vertex Pharmaceuticals Inc / Ma	4,003,821	$1,787,866,229
2	REGN	Regeneron Pharmaceuticals, Inc. This page	1,912,310	$1,477,527,197
3	ALNY	Alnylam Pharmaceuticals, Inc.	512,097	$169,437,533
4	LGND	Ligand Pharmaceuticals Inc	353,209	$70,518,176
5	CRSP	CRISPR Therapeutics AG	968,135	$46,054,181
6	MIRM	Mirum Pharmaceuticals, Inc.	475,324	$43,910,430
7	AXSM	Axsome Therapeutics, Inc.	256,625	$43,374,756
8	RYTM	Rhythm Pharmaceuticals, Inc.	465,102	$40,449,920

All Filings in REGN

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$1,477,527,197	1,912,310	-1.1%	Shares	Defined	2026-05-14
2025-12-31	$1,493,048,208	1,934,326	-2.3%	Shares	Defined	2026-02-12
2025-09-30	$1,112,987,037	1,979,453	+2.0%	Shares	Defined	2025-11-13
2025-06-30	$1,019,061,750	1,941,070	+18.6%	Shares	Defined	2025-08-13
2025-03-31	$1,037,588,229	1,635,981	+3.8%	Shares	Defined	2025-05-14
2024-12-31	$1,122,168,352	1,575,349	+33.4%	Shares	Defined	2025-02-12
2024-09-30	$1,241,884,476	1,181,352	-2.9%	Shares	Defined	2024-11-13
2024-06-30	$1,278,952,161	1,216,856	+0.8%	Shares	Defined	2024-08-13
2024-03-31	$1,161,913,115	1,207,195	-1.0%	Shares	Defined	2024-05-14
2023-12-31	$1,070,694,355	1,219,067	-1.1%	Shares	Defined	2024-02-13
2023-09-30	$1,014,610,101	1,232,879	-3.5%	Shares	Defined	2023-11-09
2023-06-30	$917,923,353	1,277,484	-2.7%	Shares	Defined	2023-08-11
2023-03-31	$1,078,365,459	1,312,407	-1.9%	Shares	Defined	2023-05-15
2022-12-31	$965,123,464	1,337,681	-22.1%	Shares	Defined	2023-02-10
2022-09-30	$1,182,525,952	1,716,617	-2.7%	Shares	Defined	2022-11-14
2022-06-30	$1,043,219,129	1,764,788	-30.7%	Shares	Defined	2022-08-05
2022-03-31	$1,779,606,985	2,548,047	-3.1%	Shares	Defined	2022-05-13
2021-12-31	$1,660,361,439	2,629,151	-4.6%	Shares	Defined	2022-02-14
2021-09-30	$1,668,320,886	2,756,735	+0.1%	Shares	Defined	2021-11-12
2021-06-30	$1,538,344,272	2,754,224	-4.2%	Shares	Defined	2021-08-13
2021-03-31	$1,360,924,755	2,876,368	-3.0%	Shares	Defined	2021-05-17
2020-12-31	$1,432,219,692	2,964,583	-6.7%	Shares	Defined	2021-02-12
2020-09-30	$1,777,860,159	3,175,998	-2.6%	Shares	Defined	2020-11-12
2020-06-30	$2,032,910,657	3,259,698	-6.7%	Shares	Defined	2020-08-14
2020-03-31	$1,705,505,659	3,492,813	—	Shares	Defined	2020-05-15
No filing history on record for this holder in this stock.