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
2021
Q3 		– Sell
-28,100
Closed -$5.61M – 2139
2021
Q2 		$5.61M Buy
+28,100
New +$5.45M 0.01% 627
2017
Q1 		– Sell
-82,500
Closed -$2.54M – 4446
2016
Q4 		$2.54M Buy
+82,500
New +$2.55M 0.01% 865
2016
Q3 		– Sell
-100,000
Closed -$2.74M – 3724
2016
Q2 		$2.74M Hold
100,000
– – 0.01% 823
2016
Q1 		$2.68M Buy
+100,000
New +$2.45M 0.01% 799
2015
Q4 		– Sell
-117,100
Closed -$3.26M – 3688
2015
Q3 		$3.26M Buy
+117,100
New +$4.23M 0.01% 811

Other funds holding RGEN

BlackRock
BlackRock New York $5.72T AUM 30.48% 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 $865B AUM 30.76% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
UCFA
United Capital Financial Advisors Irving, Texas $16.3B AUM 16.34% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $544B AUM 28.31% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 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.