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Castleark Management’s Repligen RGEN Stock Holding History

Castleark Management’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
Q1 		– Sell
-14,900
Closed -$2.14M – 331
2024
Q4 		$2.14M Sell
14,900
-600
-4% -$86K 0.07% 183
2024
Q3 		$2.31M Buy
+15,500
New +$2.22M 0.09% 168
2024
Q2 		– Sell
-3,120
Closed -$574K – 300
2024
Q1 		$574K Buy
+3,120
New +$594K 0.02% 227
2023
Q4 		– Sell
-25,360
Closed -$4.03M – 305
2023
Q3 		$4.03M Buy
+25,360
New +$4.15M 0.21% 119
2022
Q4 		– Sell
-2,530
Closed -$473K – 315
2022
Q3 		$473K Buy
2,530
+1,060
+72% +$224K 0.03% 227
2022
Q2 		$239K Hold
1,470
– – 0.01% 258
2022
Q1 		$276K Hold
1,470
– – 0.01% 278
2021
Q4 		$389K Hold
1,470
– – 0.01% 276
2021
Q3 		$425K Buy
1,470
+720
+96% +$185K 0.02% 260
2021
Q2 		$150K Hold
750
– – 0.01% 311
2021
Q1 		$146K Buy
+750
New +$154K 0.01% 309
2020
Q2 		– Sell
-113,076
Closed -$10.9M – 377
2020
Q1 		$10.9M Sell
113,076
-3,755
-3% -$363K 0.65% 42
2019
Q4 		$10.8M Buy
116,831
+41,051
+54% +$3.45M 0.43% 59
2019
Q3 		$5.81M Buy
75,780
+49,960
+193% +$4.37M 0.24% 138
2019
Q2 		$2.22M Buy
+25,820
New +$1.76M 0.09% 209
2017
Q4 		– Sell
-127,998
Closed -$4.91M – 433
2017
Q3 		$4.91M Sell
127,998
-55,205
-30% -$2.31M 0.15% 189
2017
Q2 		$7.59M Buy
+183,203
New +$6.96M 0.25% 141
2015
Q4 		– Sell
-123,690
Closed -$3.44M – 412
2015
Q3 		$3.44M Buy
123,690
+37,465
+43% +$1.35M 0.11% 217
2015
Q2 		$3.56M Buy
+86,225
New +$3.16M 0.1% 231

Other funds holding RGEN

T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
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
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
CIP
Champlain Investment Partners Burlington, Vermont $3.89B AUM 16.15% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $609B AUM 40.19% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.91% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $26.9B AUM 34.44% 1-Year Est. Return
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return

Castleark Management's RGEN Position: Q1 2025 in Review

Castleark Management sold out of Repligen (RGEN) in Q1 2025, closing a stake of 14,900 shares — an estimated $2.14M sold.

Castleark Management first reported a position in RGEN in Q2 2015 and held it in 19 quarters. The position peaked at $10.9M in Q1 2020. 442 funds tracked by Wall St. Rank hold RGEN as of Q1 2025.

  • Castleark Management reported no remaining Repligen position as of Q1 2025 after selling out during the quarter.
  • Castleark Management sold 14,900 Repligen shares in Q1 2025, an estimated $2.14M.
  • Castleark Management first reported a position in Repligen in Q2 2015 and held it in 19 quarters.
  • Castleark Management's Repligen position peaked at $10.9M in Q1 2020.
  • 442 funds tracked by Wall St. Rank held Repligen as of Q1 2025.

Based on Castleark Management's 13F filing for Q1 2025, filed 15 May 2025.