Parallax Volatility Advisers
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Parallax Volatility Advisers’s Repligen RGEN Stock Holding History

Parallax Volatility Advisers’s Portfolio RGEN Stock Details RGEN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-11,314
Closed -$1.51M – 1800
2025
Q3 		$1.51M Buy
11,314
+1,112
+11% +$135K ﹤0.01% 1003
2025
Q2 		$1.27M Buy
10,202
+2,287
+29% +$291K ﹤0.01% 1005
2025
Q1 		$1.01M Buy
7,915
+1,709
+28% +$263K ﹤0.01% 1047
2024
Q4 		$893K Buy
+6,206
New +$890K ﹤0.01% 1355
2022
Q3 		– Sell
-10,752
Closed -$1.75M – 3313
2022
Q2 		$1.75M Buy
10,752
+4,387
+69% +$694K ﹤0.01% 1413
2022
Q1 		$1.2M Buy
+6,365
New +$1.21M ﹤0.01% 1577
2019
Q1 		– Sell
-53
Closed -$3K – 3791
2018
Q4 		$3K Buy
+53
New +$3.11K ﹤0.01% 2645
2018
Q1 		– Sell
-5,712
Closed -$207K – 3848
2017
Q4 		$207K Buy
+5,712
New +$207K ﹤0.01% 2260

Other funds holding RGEN

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
UCFA
United Capital Financial Advisors Irving, Texas $18.2B AUM 22.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $609B AUM 40.19% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return

Parallax Volatility Advisers's RGEN Position: Q4 2025 in Review

Parallax Volatility Advisers sold out of Repligen (RGEN) in Q4 2025, closing a stake of 11,314 shares — an estimated $1.51M sold.

Parallax Volatility Advisers first reported a position in RGEN in Q4 2017 and held it in 8 quarters. The position peaked at $1.75M in Q2 2022. 474 funds tracked by Wall St. Rank hold RGEN as of Q4 2025.

  • Parallax Volatility Advisers reported no remaining Repligen position as of Q4 2025 after selling out during the quarter.
  • Parallax Volatility Advisers sold 11,314 Repligen shares in Q4 2025, an estimated $1.51M.
  • Parallax Volatility Advisers first reported a position in Repligen in Q4 2017 and held it in 8 quarters.
  • Parallax Volatility Advisers's Repligen position peaked at $1.75M in Q2 2022.
  • 474 funds tracked by Wall St. Rank held Repligen as of Q4 2025.

Based on Parallax Volatility Advisers's 13F filing for Q4 2025, filed 17 Feb 2026.