Ticker · CUSIP 759916109

RGEN

REPLIGEN CORP
Healthcare·Medical Instruments & Supplies
···Share
Holders (tracked)
14
Combined shares
8,759,564
Combined value
$682.49M
Last close
$127.09
Quarter
2025Q4
Tracked holders · last 8 quarters
-1 vs previous quarter over the last 8.
14132024Q12025Q4
Price is +63.1% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

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

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 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2016Q1$43.95+189.2%$584.5M
Paul Tudor Jones (Tudor Investment)2016Q1$124.88+1.8%$165K
AQR Capital Management2016Q1$125.10+1.6%$1.1M
Steve Cohen (Point72)2018Q3$132.27-3.9%$127.9M
Two Sigma Investments2016Q1$134.08-5.2%$1.1M
Ray Dalio (Bridgewater Associates)2021Q3$143.30-11.3%$1.0M
Ron Baron (Baron Capital / BAMCO)2022Q3$147.49-13.8%$69.2M
D.E. Shaw & Co.2016Q1$147.94-14.1%$3.3M
Ken Griffin (Citadel Advisors)2016Q1$151.73-16.2%$3.6M
Ken Griffin (Citadel Advisors)2016Q1$151.73-16.2%$3.6M
Ken Griffin (Citadel Advisors)2016Q1$151.73-16.2%$3.6M
Izzy Englander (Millennium Mgmt)2016Q1$159.48-20.3%$1.3M
Izzy Englander (Millennium Mgmt)2016Q1$159.48-20.3%$1.3M
Norges Bank (Norway SWF)2016Q1$2158.61-94.1%$58.7M

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions2
Added to2
Trimmed6
Exited2

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
14
$104.48B
2022Q2
16
$85.81B
2022Q3
17
$94.6M
2022Q4
15
$1.29B
2023Q1
13
$1.86B
2023Q2
17
$1.64B
2023Q3
15
$1.73B
2023Q4
12
$2.01B
2024Q1
13
$2.19B
2024Q2
17
$1.47B
2024Q3
13
$490.5M
2024Q4
14
$622.7M
2025Q1
12
$544.2M
2025Q2
15
$762.9M
2025Q3
15
$669.6M
2025Q4
14
$682.5M
Congress members trading this stock
DateMemberTypeAmount rangeFiling
2025-10-31Lisa McClainSell$1K – $15KPDF ↗
2025-10-30Lisa McClainBuy$1K – $15KPDF ↗
2025-10-30Lisa McClainSell$1K – $15KPDF ↗
2025-07-22Lisa McClainBuy$1K – $15KPDF ↗
2025-06-17Lisa McClainSell (P)$1K – $15KPDF ↗
2025-06-11Lisa McClainBuy$1K – $15KPDF ↗

Who owns RGEN

14 super-investors · 2025Q4
Tracked stake
8.76M
shares
Combined value
$682M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added2Trim9Sold1
#ManagerSharesValue
1Ken Griffin
Citadel Advisors
1.39M$228M
2Steve Cohen
Point72
1.01M$165M
3Izzy Englander
Millennium Mgmt
650.5K$107M
4Ron Baron
Baron Capital / BAMCO
544.8K$89M
5Norges Bank
Norway SWF
462.1K$76M
6Ken Griffin
Citadel Advisors
28.5K$5M
7D.E. Shaw & Co.26.3K$4M
8Ken Griffin
Citadel Advisors
11.4K$2M
9Izzy Englander
Millennium Mgmt
10.1K$2M
10AQR Capital Management8.6K$1M
11Two Sigma Investments8.4K$1M
12Ray Dalio
Bridgewater Associates
7.9K$1M
13T. Rowe Price4.60M$754K
14Paul Tudor Jones
Tudor Investment
1.3K$213K

Recent moves

20 transactions
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