Stocks
REGN
CITADEL ADVISORS LLC

CITADEL ADVISORS LLC

CIK

0001423053

City

Chicago

State / Country

Stock

REGN — REGENERON PHARMACEUTICALS, INC.

Holdings in REGN

Position Over Time

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2025-12-31	$204,777,111	265,300	+278.1%	Shares	Defined	2026-02-17
2025-12-31	$54,165,977	70,175	-74.4%	Shares	Defined	2026-02-17
2025-12-31	$211,492,380	274,000	+66.4%	Shares	Defined	2026-02-17
2025-09-30	$92,605,869	164,700	-21.2%	Shares	Defined	2025-11-14
2025-09-30	$117,458,203	208,900	-9.3%	Shares	Defined	2025-11-14
2025-09-30	$129,449,734	230,227	+16.4%	Shares	Defined	2025-11-14
2025-06-30	$103,845,000	197,800	-31.9%	Shares	Defined	2025-08-14
2025-06-30	$152,512,500	290,500	-57.3%	Shares	Defined	2025-08-14
2025-06-30	$357,265,125	680,505	+198.5%	Shares	Defined	2025-08-14
2025-03-31	$144,604,440	228,000	+20.4%	Shares	Defined	2025-05-15
2025-03-31	$120,123,162	189,400	+152.9%	Shares	Defined	2025-05-15
2025-03-31	$47,505,095	74,902	-63.9%	Shares	Defined	2025-05-15
2024-12-31	$147,666,009	207,300	+7.8%	Shares	Defined	2025-02-14
2024-12-31	$137,013,826	192,346	+14.1%	Shares	Defined	2025-02-14
2024-12-31	$120,098,838	168,600	+140.0%	Shares	Defined	2025-02-14
2024-09-30	$73,860,122	70,260	-65.0%	Shares	Defined	2024-11-14
2024-09-30	$211,194,116	200,900	+38.2%	Shares	Defined	2024-11-14
2024-09-30	$152,850,296	145,400	+1.9%	Shares	Defined	2024-11-14
2024-06-30	$149,981,981	142,700	+70.9%	Shares	Defined	2024-08-14
2024-06-30	$87,761,005	83,500	-23.8%	Shares	Defined	2024-08-14
2024-06-30	$115,146,642	109,556	+39.4%	Shares	Defined	2024-08-14
2024-03-31	$75,630,538	78,578	-36.1%	Shares	Defined	2024-05-15
2024-03-31	$118,290,021	122,900	-41.9%	Shares	Defined	2024-05-15
2024-03-31	$203,470,386	211,400	-27.8%	Shares	Defined	2024-05-15
2023-12-31	$257,251,141	292,900	+21.3%	Shares	Defined	2024-02-14
2023-12-31	$212,019,206	241,400	-15.2%	Shares	Defined	2024-02-14
2023-12-31	$249,953,428	284,591	+341.5%	Shares	Defined	2024-02-14
2023-09-30	$53,044,708	64,456	-76.6%	Shares	Defined	2023-11-14
2023-09-30	$226,231,704	274,900	+6.3%	Shares	Defined	2023-11-14
2023-09-30	$212,735,160	258,500	-14.2%	Shares	Defined	2023-11-14
2023-06-30	$216,567,956	301,400	+658.7%	Shares	Defined	2023-08-14
2023-06-30	$28,544,719	39,726	-84.8%	Shares	Defined	2023-08-14
2023-06-30	$187,826,356	261,400	-10.2%	Shares	Defined	2023-08-14
2023-03-31	$239,308,100	291,246	-36.1%	Shares	Defined	2023-05-15
2023-03-31	$374,681,520	456,000	-3.3%	Shares	Defined	2023-05-15
2023-03-31	$387,335,238	471,400	+23.5%	Shares	Defined	2023-05-15
2022-12-31	$275,464,882	381,800	+395.4%	Shares	Defined	2023-02-14
2022-12-31	$55,609,562	77,076	-86.5%	Shares	Defined	2023-02-14
2022-12-31	$413,341,621	572,900	+21.0%	Shares	Defined	2023-02-14
2022-09-30	$326,248,832	473,600	-21.5%	Shares	Defined	2022-11-14
2022-09-30	$415,801,932	603,600	+3225.6%	Shares	Defined	2022-11-14
2022-09-30	$12,502,990	18,150	-93.3%	Shares	Defined	2022-11-14
2022-06-30	$160,314,456	271,200	-8.7%	Shares	Defined	2022-08-15
2022-06-30	$175,565,610	297,000	+3130.4%	Shares	Defined	2022-08-15
2022-06-30	$5,434,848	9,194	-48.9%	Shares	Defined	2022-08-15
2022-03-31	$12,569,464	17,997	-92.7%	Shares	Defined	2022-05-16
2022-03-31	$171,671,636	245,800	+34.0%	Shares	Defined	2022-05-16
2022-03-31	$128,160,070	183,500	+83.6%	Shares	Defined	2022-05-16
2021-12-31	$63,101,478	99,920	-67.8%	Shares	Defined	2022-02-14
2021-12-31	$195,771,200	310,000	—	Shares	Defined	2022-02-14