REGENERON PHARMACEUTICALS

Ticker: REGN CUSIP: 75886F107 Class: COM

CITADEL ADVISORS LLC's Holding History (CIK: 0001423053)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 144,970 Value ($000) $111,898 Avg Close $678.68 Range $540.32 - $792.77

Q3 2025

Shares 230,227 Value ($000) $129,450 Avg Close $564.28 Range $519.56 - $609.69

Q2 2025

Shares 680,505 Value ($000) $357,265 Avg Close $556.12 Range $475.17 - $638.52

Q1 2025

Shares 74,902 Value ($000) $47,505 Avg Close $684.44 Range $615.89 - $745.12

Q4 2024

Shares 192,346 Value ($000) $137,014 Avg Close $834.60 Range $689.18 - $1055.74

Q3 2024

Shares 70,260 Value ($000) $73,860 Avg Close $1106.73 Range $1002.85 - $1204.52

Q2 2024

Shares 109,556 Value ($000) $115,147 Avg Close $964.05 Range $870.40 - $1075.21

Q1 2024

Shares 78,578 Value ($000) $75,631 Avg Close $945.64 Range $866.58 - $992.82

Q4 2023

Shares 284,591 Value ($000) $249,953 Avg Close $818.96 Range $764.95 - $894.90

Q3 2023

Shares 64,456 Value ($000) $53,045 Avg Close $781.58 Range $684.72 - $842.83

Q2 2023

Shares 39,726 Value ($000) $28,545 Avg Close $766.75 Range $681.03 - $832.93

Q1 2023

Shares 291,246 Value ($000) $239,308 Avg Close $750.05 Range $664.32 - $830.39

Q4 2022

Shares 77,076 Value ($000) $55,610 Avg Close $733.79 Range $690.81 - $774.70

Q3 2022

Shares 18,150 Value ($000) $12,503 Avg Close $625.92 Range $560.71 - $750.51

Q2 2022

Shares 9,194 Value ($000) $5,435 Avg Close $646.43 Range $535.04 - $743.30

Q1 2022

Shares 17,997 Value ($000) $12,569 Avg Close $629.16 Range $589.59 - $706.29

Q4 2021

Shares 99,920 Value ($000) $63,102 Avg Close $611.44 Range $536.21 - $670.14

Q3 2021

Shares 109,523 Value ($000) $66,281 Avg Close $617.39 Range $551.89 - $682.83

Q2 2021

Shares 57,768 Value ($000) $32,265 Avg Close $503.83 Range $466.78 - $566.85

Q1 2021

Shares 19,683 Value ($000) $9,313 Avg Close $484.19 Range $438.57 - $555.83

Q4 2020

Shares 39,021 Value ($000) $18,851 Avg Close $536.82 Range $468.18 - $616.55

Q3 2020

Shares 16,005 Value ($000) $8,959 Avg Close $602.99 Range $537.02 - $660.97

Q1 2020

Shares 23,514 Value ($000) $11,482 Avg Close $410.21 Range $326.32 - $515.14

Q4 2019

Shares 395,879 Value ($000) $148,645 Avg Close $334.59 Range $270.76 - $380.14

Q3 2019

Shares 155,361 Value ($000) $43,097 Avg Close $294.28 Range $269.87 - $318.99

Q2 2019

Shares 572,879 Value ($000) $179,311 Avg Close $331.08 Range $293.64 - $413.60

Q1 2019

Shares 178,390 Value ($000) $73,251 Avg Close $409.51 Range $363.99 - $439.56

Q4 2018

Shares 68,542 Value ($000) $25,600 Avg Close $364.00 Range $325.77 - $407.74

Q3 2018

Shares 43,033 Value ($000) $17,387 Avg Close $378.49 Range $340.69 - $414.19

Q2 2018

Shares 55,976 Value ($000) $19,311 Avg Close $311.03 Range $280.34 - $347.31

Q1 2018

Shares 29,231 Value ($000) $10,066 Avg Close $345.90 Range $311.80 - $394.59

Q4 2017

Shares 185,086 Value ($000) $69,585 Avg Close $402.77 Range $351.19 - $474.37

Q3 2017

Shares 7,655 Value ($000) $3,422 Avg Close $473.21 Range $424.12 - $523.22

Q2 2017

Shares 159,740 Value ($000) $78,454 Avg Close $435.19 Range $358.01 - $540.55

Q1 2017

Shares 106,042 Value ($000) $41,093 Avg Close $368.62 Range $338.21 - $399.00

Q4 2016

Shares 385,660 Value ($000) $141,572 Avg Close $378.17 Range $323.56 - $450.46

Q3 2016

Shares 128,001 Value ($000) $51,458 Avg Close $398.92 Range $346.51 - $441.54

Q2 2016

Shares 143,731 Value ($000) $50,195 Avg Close $383.00 Range $327.27 - $431.54

Q1 2016

Shares 20,111 Value ($000) $7,249 Avg Close $409.79 Range $347.04 - $529.97

Q4 2015

Shares 1,370 Value ($000) $744 Avg Close $538.82 Range $445.63 - $589.32

Q3 2015

Shares 68,869 Value ($000) $32,034 Avg Close $534.07 Range $433.12 - $602.59

Q2 2015

Shares 360,952 Value ($000) $184,133 Avg Close $485.93 Range $431.08 - $541.00

Q1 2015

Shares 304,277 Value ($000) $137,375 Avg Close $421.46 Range $390.83 - $492.77

Q4 2014

Shares 18,756 Value ($000) $7,695 Avg Close $391.09 Range $318.29 - $435.23

Q3 2014

Shares 129,302 Value ($000) $46,616 Avg Close $333.32 Range $283.49 - $367.27

Q2 2014

Shares 35,195 Value ($000) $9,942 Avg Close $294.74 Range $268.01 - $318.24

Q1 2014

Shares 10,824 Value ($000) $3,251 Avg Close $306.39 Range $261.52 - $350.55

Q4 2013

Shares 178,666 Value ($000) $49,176 Avg Close $286.03 Range $256.27 - $317.74

Q3 2013

Shares 383,572 Value ($000) $120,008 Avg Close $261.58 Range $224.53 - $318.07

Q2 2013

Shares 24,152 Value ($000) $5,432 Avg Close $231.58 Range $176.14 - $282.42

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	144,970	$111,898	$678.68	$540.32 - $792.77
Q3 2025	230,227	$129,450	$564.28	$519.56 - $609.69
Q2 2025	680,505	$357,265	$556.12	$475.17 - $638.52
Q1 2025	74,902	$47,505	$684.44	$615.89 - $745.12
Q4 2024	192,346	$137,014	$834.60	$689.18 - $1055.74
Q3 2024	70,260	$73,860	$1106.73	$1002.85 - $1204.52
Q2 2024	109,556	$115,147	$964.05	$870.40 - $1075.21
Q1 2024	78,578	$75,631	$945.64	$866.58 - $992.82
Q4 2023	284,591	$249,953	$818.96	$764.95 - $894.90
Q3 2023	64,456	$53,045	$781.58	$684.72 - $842.83
Q2 2023	39,726	$28,545	$766.75	$681.03 - $832.93
Q1 2023	291,246	$239,308	$750.05	$664.32 - $830.39
Q4 2022	77,076	$55,610	$733.79	$690.81 - $774.70
Q3 2022	18,150	$12,503	$625.92	$560.71 - $750.51
Q2 2022	9,194	$5,435	$646.43	$535.04 - $743.30
Q1 2022	17,997	$12,569	$629.16	$589.59 - $706.29
Q4 2021	99,920	$63,102	$611.44	$536.21 - $670.14
Q3 2021	109,523	$66,281	$617.39	$551.89 - $682.83
Q2 2021	57,768	$32,265	$503.83	$466.78 - $566.85
Q1 2021	19,683	$9,313	$484.19	$438.57 - $555.83
Q4 2020	39,021	$18,851	$536.82	$468.18 - $616.55
Q3 2020	16,005	$8,959	$602.99	$537.02 - $660.97
Q1 2020	23,514	$11,482	$410.21	$326.32 - $515.14
Q4 2019	395,879	$148,645	$334.59	$270.76 - $380.14
Q3 2019	155,361	$43,097	$294.28	$269.87 - $318.99
Q2 2019	572,879	$179,311	$331.08	$293.64 - $413.60
Q1 2019	178,390	$73,251	$409.51	$363.99 - $439.56
Q4 2018	68,542	$25,600	$364.00	$325.77 - $407.74
Q3 2018	43,033	$17,387	$378.49	$340.69 - $414.19
Q2 2018	55,976	$19,311	$311.03	$280.34 - $347.31
Q1 2018	29,231	$10,066	$345.90	$311.80 - $394.59
Q4 2017	185,086	$69,585	$402.77	$351.19 - $474.37
Q3 2017	7,655	$3,422	$473.21	$424.12 - $523.22
Q2 2017	159,740	$78,454	$435.19	$358.01 - $540.55
Q1 2017	106,042	$41,093	$368.62	$338.21 - $399.00
Q4 2016	385,660	$141,572	$378.17	$323.56 - $450.46
Q3 2016	128,001	$51,458	$398.92	$346.51 - $441.54
Q2 2016	143,731	$50,195	$383.00	$327.27 - $431.54
Q1 2016	20,111	$7,249	$409.79	$347.04 - $529.97
Q4 2015	1,370	$744	$538.82	$445.63 - $589.32
Q3 2015	68,869	$32,034	$534.07	$433.12 - $602.59
Q2 2015	360,952	$184,133	$485.93	$431.08 - $541.00
Q1 2015	304,277	$137,375	$421.46	$390.83 - $492.77
Q4 2014	18,756	$7,695	$391.09	$318.29 - $435.23
Q3 2014	129,302	$46,616	$333.32	$283.49 - $367.27
Q2 2014	35,195	$9,942	$294.74	$268.01 - $318.24
Q1 2014	10,824	$3,251	$306.39	$261.52 - $350.55
Q4 2013	178,666	$49,176	$286.03	$256.27 - $317.74
Q3 2013	383,572	$120,008	$261.58	$224.53 - $318.07
Q2 2013	24,152	$5,432	$231.58	$176.14 - $282.42