Walleye Trading
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Walleye Trading’s Repligen RGEN Stock Holding History

Walleye Trading’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
2026
Q2 		$5.9M Buy
+43,268
New +$5.32M 0.01% 1201
2026
Q1 		– Sell
-18
Closed -$2.95K – 4603
2025
Q4 		$2.95K Sell
18
-943
-98% -$148K ﹤0.01% 4217
2025
Q3 		$128K Buy
961
+274
+40% +$33.3K ﹤0.01% 3605
2025
Q2 		$85.4K Sell
687
-381
-36% -$48.5K ﹤0.01% 3657
2025
Q1 		$136K Sell
1,068
-7,613
-88% -$1.17M ﹤0.01% 3262
2024
Q4 		$1.25M Buy
8,681
+4,812
+124% +$690K ﹤0.01% 2012
2024
Q3 		$576K Sell
3,869
-4,077
-51% -$585K ﹤0.01% 2436
2024
Q2 		$1M Buy
+7,946
New +$1.25M ﹤0.01% 2073
2024
Q1 		– Sell
-10,334
Closed -$1.97M – 5240
2023
Q4 		$1.86M Buy
10,334
+5,145
+99% +$801K ﹤0.01% 1982
2023
Q3 		$825K Sell
5,189
-3,634
-41% -$594K ﹤0.01% 2533
2023
Q2 		$1.25M Buy
+8,823
New +$1.41M ﹤0.01% 1988
2021
Q3 		– Sell
-3,172
Closed -$814K – 5621
2021
Q2 		$633K Buy
+3,172
New +$615K ﹤0.01% 2635
2021
Q1 		– Sell
-1,098
Closed -$225K – 5213
2020
Q4 		$210K Buy
1,098
+751
+216% +$137K ﹤0.01% 3469
2020
Q3 		$51K Buy
+347
New +$49.6K ﹤0.01% 3627
2020
Q1 		– Sell
-1,194
Closed -$110K – 4454
2019
Q4 		$110K Buy
+1,194
New +$100K ﹤0.01% 3516
2019
Q2 		– Sell
-2,078
Closed -$142K – 4414
2019
Q1 		$123K Sell
2,078
-3,372
-62% -$194K ﹤0.01% 3345
2018
Q4 		$287K Buy
5,450
+2,586
+90% +$152K ﹤0.01% 3023
2018
Q3 		$159K Buy
+2,864
New +$148K ﹤0.01% 3916
2016
Q1 		– Sell
-29
Closed -$1K – 5752
2015
Q4 		$1K Sell
29
-1,571
-98% -$45.3K ﹤0.01% 5161
2015
Q3 		$45K Buy
1,600
+1,500
+1,500% +$54.2K ﹤0.01% 3582
2015
Q2 		$4K Buy
+100
New +$3.66K ﹤0.01% 4557

Other funds holding RGEN

BlackRock
BlackRock New York $6.73T AUM 46.02% 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
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
MC
Maverick Capital Dallas, Texas $11.3B AUM 76.6% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
WA
Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return

Walleye Trading's RGEN Position: Q2 2026 in Review

Walleye Trading opened a new position in Repligen (RGEN) in Q2 2026: 43,268 shares worth $5.9M. The stake represents 0.01% of the portfolio and ranks #1201 among its holdings. This is a return to the name: Walleye Trading previously reported a position in RGEN as recently as Q4 2025.

Walleye Trading first reported a position in RGEN in Q2 2015 and has held it in 21 quarters since. 482 funds tracked by Wall St. Rank hold RGEN as of Q2 2026.

  • Walleye Trading held 43,268 shares of Repligen worth $5.9M as of Q2 2026.
  • Repligen was a new Walleye Trading position in Q2 2026.
  • Repligen made up 0.01% of Walleye Trading's portfolio in Q2 2026, its #1201 holding.
  • Walleye Trading first reported a position in Repligen in Q2 2015 and has held it in 21 quarters since.
  • 482 funds tracked by Wall St. Rank held Repligen as of Q2 2026.

Based on Walleye Trading's 13F filing for Q2 2026, filed 3 Aug 2026.