REPLIGEN CORP

Ticker: RGEN CUSIP: 759916109 Class: Common Stock

LOOMIS SAYLES & CO L P's Holding History (CIK: 0000312348)

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

Q4 2025

Shares 149,777 Value ($000) $24,542 Avg Close $156.63 Range $134.19 - $174.01

Q3 2025

Shares 168,051 Value ($000) $22,463 Avg Close $121.47 Range $110.77 - $135.57

Q2 2025

Shares 104,846 Value ($000) $13,041 Avg Close $127.25 Range $102.97 - $148.94

Q2 2022

Shares 11 Value ($000) $2 Avg Close $158.16 Range $137.21 - $190.59

Q1 2022

Shares 11 Value ($000) $2 Avg Close $189.96 Range $156.28 - $265.78

Q1 2021

Shares 58 Value ($000) $11 Avg Close $205.03 Range $173.09 - $228.84

Q4 2020

Shares 285,778 Value ($000) $54,764 Avg Close $181.94 Range $146.52 - $212.55

Q3 2020

Shares 341,912 Value ($000) $50,445 Avg Close $142.94 Range $120.12 - $159.97

Q2 2020

Shares 335,420 Value ($000) $41,461 Avg Close $117.64 Range $92.00 - $143.93

Q1 2020

Shares 306,289 Value ($000) $29,569 Avg Close $96.54 Range $78.41 - $109.94

Q4 2019

Shares 275,675 Value ($000) $25,499 Avg Close $84.01 Range $72.32 - $93.50

Q3 2019

Shares 380,578 Value ($000) $29,187 Avg Close $87.47 Range $75.80 - $99.25

Q2 2019

Shares 282,739 Value ($000) $24,301 Avg Close $68.16 Range $52.87 - $86.16

Q3 2018

Shares 171 Value ($000) $9 Avg Close $51.54 Range $45.00 - $58.99

Q2 2018

Shares 197 Value ($000) $9 Avg Close $41.16 Range $34.61 - $47.87

Q1 2018

Shares 182 Value ($000) $7 Avg Close $35.17 Range $29.56 - $37.82

Q4 2017

Shares 182 Value ($000) $7 Avg Close $36.20 Range $31.96 - $40.05

Q3 2017

Shares 182 Value ($000) $7 Avg Close $41.91 Range $35.73 - $46.12

Q2 2017

Shares 223 Value ($000) $9 Avg Close $38.00 Range $32.73 - $46.81

Q1 2017

Shares 223 Value ($000) $8 Avg Close $31.67 Range $28.48 - $35.61

Q4 2016

Shares 223 Value ($000) $7 Avg Close $30.93 Range $26.16 - $34.06

Q3 2016

Shares 131 Value ($000) $4 Avg Close $30.18 Range $25.93 - $33.79

Q2 2016

Shares 241 Value ($000) $7 Avg Close $25.57 Range $21.11 - $28.97

Q1 2016

Shares 326 Value ($000) $9 Avg Close $24.47 Range $20.07 - $28.85

Q4 2015

Shares 42 Value ($000) $1 Avg Close $28.84 Range $21.69 - $36.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	149,777	$24,542	$156.63	$134.19 - $174.01
Q3 2025	168,051	$22,463	$121.47	$110.77 - $135.57
Q2 2025	104,846	$13,041	$127.25	$102.97 - $148.94
Q2 2022	11	$2	$158.16	$137.21 - $190.59
Q1 2022	11	$2	$189.96	$156.28 - $265.78
Q1 2021	58	$11	$205.03	$173.09 - $228.84
Q4 2020	285,778	$54,764	$181.94	$146.52 - $212.55
Q3 2020	341,912	$50,445	$142.94	$120.12 - $159.97
Q2 2020	335,420	$41,461	$117.64	$92.00 - $143.93
Q1 2020	306,289	$29,569	$96.54	$78.41 - $109.94
Q4 2019	275,675	$25,499	$84.01	$72.32 - $93.50
Q3 2019	380,578	$29,187	$87.47	$75.80 - $99.25
Q2 2019	282,739	$24,301	$68.16	$52.87 - $86.16
Q3 2018	171	$9	$51.54	$45.00 - $58.99
Q2 2018	197	$9	$41.16	$34.61 - $47.87
Q1 2018	182	$7	$35.17	$29.56 - $37.82
Q4 2017	182	$7	$36.20	$31.96 - $40.05
Q3 2017	182	$7	$41.91	$35.73 - $46.12
Q2 2017	223	$9	$38.00	$32.73 - $46.81
Q1 2017	223	$8	$31.67	$28.48 - $35.61
Q4 2016	223	$7	$30.93	$26.16 - $34.06
Q3 2016	131	$4	$30.18	$25.93 - $33.79
Q2 2016	241	$7	$25.57	$21.11 - $28.97
Q1 2016	326	$9	$24.47	$20.07 - $28.85
Q4 2015	42	$1	$28.84	$21.69 - $36.00