REPLIGEN CORP

Ticker: RGEN CUSIP: 759916109 Class: Common Stock

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

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

Q4 2025

Shares 50,654 Value ($000) $8,300 Avg Close $156.63 Range $134.19 - $174.01

Q3 2025

Shares 49,837 Value ($000) $6,662 Avg Close $121.47 Range $110.77 - $135.57

Q2 2025

Shares 50,754 Value ($000) $6,313 Avg Close $127.25 Range $102.97 - $148.94

Q1 2025

Shares 50,951 Value ($000) $6,483 Avg Close $153.93 Range $125.39 - $182.52

Q4 2024

Shares 49,972 Value ($000) $7,193 Avg Close $143.40 Range $121.52 - $161.24

Q3 2024

Shares 50,434 Value ($000) $7,506 Avg Close $143.39 Range $117.63 - $172.65

Q2 2024

Shares 85,431 Value ($000) $10,769 Avg Close $156.74 Range $113.50 - $184.98

Q1 2024

Shares 82,201 Value ($000) $15,118 Avg Close $190.44 Range $167.40 - $211.13

Q4 2023

Shares 82,357 Value ($000) $14,808 Avg Close $155.67 Range $110.45 - $188.31

Q3 2023

Shares 83,056 Value ($000) $13,207 Avg Close $163.47 Range $134.64 - $181.26

Q2 2023

Shares 85,741 Value ($000) $12,129 Avg Close $160.35 Range $135.37 - $182.42

Q1 2023

Shares 88,524 Value ($000) $14,904 Avg Close $178.42 Range $147.53 - $200.98

Q4 2022

Shares 89,417 Value ($000) $15,139 Avg Close $181.39 Range $158.58 - $225.62

Q3 2022

Shares 67,307 Value ($000) $12,594 Avg Close $210.87 Range $157.33 - $262.26

Q2 2022

Shares 68,640 Value ($000) $11,147 Avg Close $158.16 Range $137.21 - $190.59

Q1 2022

Shares 68,302 Value ($000) $12,847 Avg Close $189.96 Range $156.28 - $265.78

Q4 2021

Shares 74,206 Value ($000) $19,653 Avg Close $269.41 Range $243.29 - $306.98

Q3 2021

Shares 90,391 Value ($000) $26,122 Avg Close $256.54 Range $193.03 - $327.32

Q2 2021

Shares 95,129 Value ($000) $18,990 Avg Close $193.99 Range $162.29 - $223.03

Q1 2021

Shares 97,367 Value ($000) $18,929 Avg Close $205.03 Range $173.09 - $228.84

Q4 2020

Shares 94,116 Value ($000) $18,035 Avg Close $181.94 Range $146.52 - $212.55

Q3 2020

Shares 92,131 Value ($000) $13,593 Avg Close $142.94 Range $120.12 - $159.97

Q2 2020

Shares 89,908 Value ($000) $11,114 Avg Close $117.64 Range $92.00 - $143.93

Q1 2020

Shares 79,449 Value ($000) $7,670 Avg Close $96.54 Range $78.41 - $109.94

Q4 2019

Shares 79,842 Value ($000) $7,385 Avg Close $84.01 Range $72.32 - $93.50

Q3 2019

Shares 80,630 Value ($000) $6,184 Avg Close $87.47 Range $75.80 - $99.25

Q2 2019

Shares 73,010 Value ($000) $6,275 Avg Close $68.16 Range $52.87 - $86.16

Q1 2019

Shares 59,854 Value ($000) $3,536 Avg Close $57.51 Range $49.07 - $63.41

Q4 2018

Shares 61,228 Value ($000) $3,229 Avg Close $58.65 Range $48.26 - $70.50

Q3 2018

Shares 59,823 Value ($000) $3,318 Avg Close $51.54 Range $45.00 - $58.99

Q2 2018

Shares 59,827 Value ($000) $2,814 Avg Close $41.16 Range $34.61 - $47.87

Q1 2018

Shares 57,156 Value ($000) $2,068 Avg Close $35.17 Range $29.56 - $37.82

Q4 2017

Shares 59,212 Value ($000) $2,148 Avg Close $36.20 Range $31.96 - $40.05

Q3 2017

Shares 60,046 Value ($000) $2,301 Avg Close $41.91 Range $35.73 - $46.12

Q2 2017

Shares 60,748 Value ($000) $2,517 Avg Close $38.00 Range $32.73 - $46.81

Q1 2017

Shares 66,504 Value ($000) $2,341 Avg Close $31.67 Range $28.48 - $35.61

Q4 2016

Shares 69,604 Value ($000) $2,145 Avg Close $30.93 Range $26.16 - $34.06

Q3 2016

Shares 71,504 Value ($000) $2,159 Avg Close $30.18 Range $25.93 - $33.79

Q2 2016

Shares 70,804 Value ($000) $1,937 Avg Close $25.57 Range $21.11 - $28.97

Q1 2016

Shares 69,603 Value ($000) $1,867 Avg Close $24.47 Range $20.07 - $28.85

Q4 2015

Shares 60,884 Value ($000) $1,722 Avg Close $28.84 Range $21.69 - $36.00

Q3 2015

Shares 59,900 Value ($000) $1,668 Avg Close $36.14 Range $27.25 - $42.22

Q2 2015

Shares 60,000 Value ($000) $2,476 Avg Close $36.64 Range $28.88 - $42.48

Q1 2015

Shares 58,681 Value ($000) $1,782 Avg Close $25.94 Range $19.53 - $34.15

Q4 2014

Shares 59,381 Value ($000) $1,176 Avg Close $22.36 Range $19.02 - $26.75

Q3 2014

Shares 59,128 Value ($000) $1,177 Avg Close $21.05 Range $18.23 - $24.68

Q2 2014

Shares 58,492 Value ($000) $1,333 Avg Close $17.80 Range $12.60 - $23.14

Q1 2014

Shares 57,192 Value ($000) $735 Avg Close $14.34 Range $11.70 - $17.26

Q4 2013

Shares 56,892 Value ($000) $776 Avg Close $11.94 Range $9.89 - $14.05

Q3 2013

Shares 56,292 Value ($000) $624 Avg Close $9.95 Range $8.25 - $11.44

Q2 2013

Shares 54,792 Value ($000) $451 Avg Close $8.40 Range $6.65 - $9.65

Q1 2013

Shares 53,540 Value ($000) $370 Avg Close $6.65 Range $5.73 - $7.31

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	50,654	$8,300	$156.63	$134.19 - $174.01
Q3 2025	49,837	$6,662	$121.47	$110.77 - $135.57
Q2 2025	50,754	$6,313	$127.25	$102.97 - $148.94
Q1 2025	50,951	$6,483	$153.93	$125.39 - $182.52
Q4 2024	49,972	$7,193	$143.40	$121.52 - $161.24
Q3 2024	50,434	$7,506	$143.39	$117.63 - $172.65
Q2 2024	85,431	$10,769	$156.74	$113.50 - $184.98
Q1 2024	82,201	$15,118	$190.44	$167.40 - $211.13
Q4 2023	82,357	$14,808	$155.67	$110.45 - $188.31
Q3 2023	83,056	$13,207	$163.47	$134.64 - $181.26
Q2 2023	85,741	$12,129	$160.35	$135.37 - $182.42
Q1 2023	88,524	$14,904	$178.42	$147.53 - $200.98
Q4 2022	89,417	$15,139	$181.39	$158.58 - $225.62
Q3 2022	67,307	$12,594	$210.87	$157.33 - $262.26
Q2 2022	68,640	$11,147	$158.16	$137.21 - $190.59
Q1 2022	68,302	$12,847	$189.96	$156.28 - $265.78
Q4 2021	74,206	$19,653	$269.41	$243.29 - $306.98
Q3 2021	90,391	$26,122	$256.54	$193.03 - $327.32
Q2 2021	95,129	$18,990	$193.99	$162.29 - $223.03
Q1 2021	97,367	$18,929	$205.03	$173.09 - $228.84
Q4 2020	94,116	$18,035	$181.94	$146.52 - $212.55
Q3 2020	92,131	$13,593	$142.94	$120.12 - $159.97
Q2 2020	89,908	$11,114	$117.64	$92.00 - $143.93
Q1 2020	79,449	$7,670	$96.54	$78.41 - $109.94
Q4 2019	79,842	$7,385	$84.01	$72.32 - $93.50
Q3 2019	80,630	$6,184	$87.47	$75.80 - $99.25
Q2 2019	73,010	$6,275	$68.16	$52.87 - $86.16
Q1 2019	59,854	$3,536	$57.51	$49.07 - $63.41
Q4 2018	61,228	$3,229	$58.65	$48.26 - $70.50
Q3 2018	59,823	$3,318	$51.54	$45.00 - $58.99
Q2 2018	59,827	$2,814	$41.16	$34.61 - $47.87
Q1 2018	57,156	$2,068	$35.17	$29.56 - $37.82
Q4 2017	59,212	$2,148	$36.20	$31.96 - $40.05
Q3 2017	60,046	$2,301	$41.91	$35.73 - $46.12
Q2 2017	60,748	$2,517	$38.00	$32.73 - $46.81
Q1 2017	66,504	$2,341	$31.67	$28.48 - $35.61
Q4 2016	69,604	$2,145	$30.93	$26.16 - $34.06
Q3 2016	71,504	$2,159	$30.18	$25.93 - $33.79
Q2 2016	70,804	$1,937	$25.57	$21.11 - $28.97
Q1 2016	69,603	$1,867	$24.47	$20.07 - $28.85
Q4 2015	60,884	$1,722	$28.84	$21.69 - $36.00
Q3 2015	59,900	$1,668	$36.14	$27.25 - $42.22
Q2 2015	60,000	$2,476	$36.64	$28.88 - $42.48
Q1 2015	58,681	$1,782	$25.94	$19.53 - $34.15
Q4 2014	59,381	$1,176	$22.36	$19.02 - $26.75
Q3 2014	59,128	$1,177	$21.05	$18.23 - $24.68
Q2 2014	58,492	$1,333	$17.80	$12.60 - $23.14
Q1 2014	57,192	$735	$14.34	$11.70 - $17.26
Q4 2013	56,892	$776	$11.94	$9.89 - $14.05
Q3 2013	56,292	$624	$9.95	$8.25 - $11.44
Q2 2013	54,792	$451	$8.40	$6.65 - $9.65
Q1 2013	53,540	$370	$6.65	$5.73 - $7.31