Ticker · CUSIP 759916109

RGEN

REPLIGEN CORP

Healthcare·Medical Instruments & Supplies

···Share

Holders (tracked)

Combined shares

8,759,564

Combined value

$1.44B

Last close

$131.21

Quarter

2025Q4

Price is -19.9% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$131.21+1.21 (+0.93%)H $172.26 · L $110.12 · Avg Vol 829K

Congress buyCongress sell

Tracked holders · last 8 quarters

-1 vs previous quarter over the last 8.

SEC event timeline

26 events

Ken Griffin (Citadel Advisors) trimmed2026-02-17
−290,468 shares · 2025Q4
Position
Ron Baron (Baron Capital / BAMCO) added2026-02-17
+163,101 shares · 2025Q4
Position
AQR Capital Management trimmed2026-02-17
−568 shares · 2025Q4
Position
Two Sigma Investments trimmed2026-02-17
−86,461 shares · 2025Q4
Position
D.E. Shaw & Co. exited2026-02-17
−249,930 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−166,510 shares · 2025Q4
Position
Steve Cohen (Point72) trimmed2026-02-17
−434,411 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+1,091,683 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+1,300 shares · 2025Q4
Position
Ray Dalio (Bridgewater Associates) trimmed2026-02-13
−25,742 shares · 2025Q4
Position
Renaissance Technologies exited2026-02-12
−109,404 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+462,094 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) exited2025-12-09
−52,755 shares · 2025Q3
Position
AQR Capital Management opened position2025-11-14
+9,216 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+115,817 shares · 2025Q3
Position
Steve Cohen (Point72) trimmed2025-11-14
−472,469 shares · 2025Q3
Position
Two Sigma Investments trimmed2025-11-14
−218,282 shares · 2025Q3
Position
D.E. Shaw & Co. added2025-11-14
+244,298 shares · 2025Q3
Position
T. Rowe Price trimmed2025-11-14
−3,096,576 shares · 2025Q3
Position
Wellington Management exited2025-11-14
−143,505 shares · 2025Q3
Position
Ron Baron (Baron Capital / BAMCO) added2025-11-14
+107,235 shares · 2025Q3
Position
Sands Capital Management exited2025-11-13
−1,251,088 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−249,167 shares · 2025Q3
Position
Ray Dalio (Bridgewater Associates) opened position2025-11-13
+33,616 shares · 2025Q3
Position
Renaissance Technologies added2025-11-13
+43,100 shares · 2025Q3
Position
Norges Bank (Norway SWF) trimmed2025-11-12
−64,250 shares · 2024Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for RGEN →

Follow-the-investor returns

If you'd copied each holder of RGEN…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Paul Tudor Jones (Tudor Investment)	2016Q1	$124.88	+5.1%	$171K
AQR Capital Management	2016Q1	$125.10	+4.9%	$1.1M
Steve Cohen (Point72)	2018Q3	$132.27	-0.8%	$132.0M
Two Sigma Investments	2016Q1	$134.08	-2.1%	$1.1M
Ray Dalio (Bridgewater Associates)	2021Q3	$143.30	-8.4%	$1.0M
D.E. Shaw & Co.	2016Q1	$147.94	-11.3%	$3.5M
Ron Baron (Baron Capital / BAMCO)	2022Q3	$148.30	-11.5%	$71.5M
Ken Griffin (Citadel Advisors)	2016Q1	$151.73	-13.5%	$3.7M
Ken Griffin (Citadel Advisors)	2016Q1	$151.73	-13.5%	$3.7M
Ken Griffin (Citadel Advisors)	2016Q1	$151.73	-13.5%	$3.7M
T. Rowe Price	2016Q1	$159.29	-17.6%	$603.4M
Izzy Englander (Millennium Mgmt)	2016Q1	$159.48	-17.7%	$1.3M
Izzy Englander (Millennium Mgmt)	2016Q1	$159.48	-17.7%	$1.3M
Norges Bank (Norway SWF)	2016Q1	$2158.61	-93.9%	$60.6M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions2

Norges Bank (Norway SWF)
+462,094
$75.7M
Paul Tudor Jones (Tudor Investment)
+1,300
$213K

Added to2

Ron Baron (Baron Capital / BAMCO)
+163,101
$26.7M
T. Rowe Price
+1,091,683
$179K

Trimmed6

Steve Cohen (Point72)
−434,411
$71.2M
Ken Griffin (Citadel Advisors)
−290,468
$47.6M
Izzy Englander (Millennium Mgmt)
−166,510
$27.3M
Two Sigma Investments
−86,461
$14.2M
Ray Dalio (Bridgewater Associates)
−25,742
$4.2M
AQR Capital Management
−568
$93K

Exited2

D.E. Shaw & Co.
−249,930
$33.4M
Renaissance Technologies
−109,404
$14.6M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	14	10,237,089	$104.48B	—
2022Q2	16	12,797,690	$85.81B	+2
2022Q3	17	13,100,461	$2.45B	+1
2022Q4	15	14,573,486	$2.47B	-2
2023Q1	13	14,846,664	$2.50B	-2
2023Q2	17	15,337,371	$2.17B	+4
2023Q3	15	14,677,202	$2.33B	-2
2023Q4	12	15,193,856	$2.73B	-3
2024Q1	13	15,467,714	$2.84B	+1
2024Q2	17	16,294,083	$2.05B	+4
2024Q3	13	9,681,664	$1.44B	-4
2024Q4	14	11,455,068	$1.65B	+1
2025Q1	12	11,835,715	$1.51B	-2
2025Q2	15	12,730,576	$1.58B	+3
2025Q3	15	8,513,280	$1.14B	—
2025Q4	14	8,759,564	$1.44B	-1

Congress members trading this stock

Date	Member	Type	Amount range	Filing
2025-10-31	Lisa McClain	Sell	$1K – $15K	PDF ↗
2025-10-30	Lisa McClain	Buy	$1K – $15K	PDF ↗
2025-10-30	Lisa McClain	Sell	$1K – $15K	PDF ↗
2025-07-22	Lisa McClain	Buy	$1K – $15K	PDF ↗
2025-06-17	Lisa McClain	Sell (P)	$1K – $15K	PDF ↗
2025-06-11	Lisa McClain	Buy	$1K – $15K	PDF ↗

Who owns RGEN

14 super-investors · 2025Q4

Tracked stake

8.76M

Combined value

$1.44B

% of shares outstanding

—

shares-out unknown

Quarter action mix

New2Added2Trim9Sold1

#	Manager	Shares	Value	% of book	Last action
1	T. Rowe Price	4.60M	$754M	0.1%	Added+1.09M
2	Ken Griffin Citadel Advisors	1.39M	$228M	0.0%	Trim−290.5K
3	Steve Cohen Point72	1.01M	$165M	0.2%	Trim−434.4K
4	Izzy Englander Millennium Mgmt	650.5K	$107M	0.0%	Trim−166.5K
5	Ron Baron Baron Capital / BAMCO	544.8K	$89M	0.2%	Added+163.1K
6	Norges Bank Norway SWF	462.1K	$76M	0.0%	New+462.1K
7	Ken Griffin Citadel Advisors	28.5K	$5M	0.0%	Trim−290.5K
8	D.E. Shaw & Co.	26.3K	$4M	0.0%	Sold−249.9K
9	Ken Griffin Citadel Advisors	11.4K	$2M	0.0%	Trim−290.5K
10	Izzy Englander Millennium Mgmt	10.1K	$2M	0.0%	Trim−166.5K
11	AQR Capital Management	8.6K	$1M	0.0%	Trim−568
12	Two Sigma Investments	8.4K	$1M	0.0%	Trim−86.5K
13	Ray Dalio Bridgewater Associates	7.9K	$1M	0.0%	Trim−25.7K
14	Paul Tudor Jones Tudor Investment	1.3K	$213K	0.0%	New+1.3K

Recent moves

20 transactions

ADDRon Baron (Baron Capital / BAMCO)
+163,101 · 2025Q4
TRIMAQR Capital Management
−568 · 2025Q4
TRIMTwo Sigma Investments
−86,461 · 2025Q4
TRIMKen Griffin (Citadel Advisors)
−290,468 · 2025Q4
TRIMSteve Cohen (Point72)
−434,411 · 2025Q4
SOLDD.E. Shaw & Co.
−249,930 · 2025Q4
ADDT. Rowe Price
+1,091,683 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+1,300 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−166,510 · 2025Q4
TRIMRay Dalio (Bridgewater Associates)
−25,742 · 2025Q4
SOLDRenaissance Technologies
−109,404 · 2025Q4
NEWNorges Bank (Norway SWF)
+462,094 · 2025Q4
SOLDPaul Tudor Jones (Tudor Investment)
−52,755 · 2025Q3
TRIMSteve Cohen (Point72)
−472,469 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+115,817 · 2025Q3
TRIMTwo Sigma Investments
−218,282 · 2025Q3
ADDD.E. Shaw & Co.
+244,298 · 2025Q3
TRIMT. Rowe Price
−3,096,576 · 2025Q3
SOLDWellington Management
−143,505 · 2025Q3
ADDRon Baron (Baron Capital / BAMCO)
+107,235 · 2025Q3

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