Simplex Trading
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Simplex Trading’s Repligen RGEN Stock Holding History

Simplex 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
Q1 		$259K Buy
2,200
+900
+69% +$126K ﹤0.01% 3990
2025
Q4 		$213K Buy
1,300
+100
+8% +$15.7K ﹤0.01% 4169
2025
Q3 		$160K Buy
1,200
+800
+200% +$97.2K ﹤0.01% 5203
2025
Q2 		$49K Sell
400
-5,200
-93% -$662K ﹤0.01% 5941
2025
Q1 		$712K Sell
5,600
-21,100
-79% -$3.25M ﹤0.01% 3025
2024
Q4 		$3.84M Buy
26,700
+16,800
+170% +$2.41M ﹤0.01% 1669
2024
Q3 		$1.47M Sell
9,900
-1,500
-13% -$215K ﹤0.01% 2547
2024
Q2 		$1.44M Buy
11,400
+9,400
+470% +$1.47M ﹤0.01% 2535
2024
Q1 		$367K Sell
2,000
-10,100
-83% -$1.92M ﹤0.01% 4170
2023
Q4 		$2.17M Buy
12,100
+7,700
+175% +$1.2M ﹤0.01% 2288
2023
Q3 		$699K Sell
4,400
-3,300
-43% -$539K ﹤0.01% 3041
2023
Q2 		$1.09M Buy
7,700
+7,200
+1,440% +$1.15M ﹤0.01% 2528
2023
Q1 		$84K Sell
500
-1,000
-67% -$178K ﹤0.01% 5349
2022
Q4 		$253K Sell
1,500
-4,700
-76% -$853K ﹤0.01% 3933
2022
Q3 		$1.16M Buy
6,200
+5,100
+464% +$1.08M ﹤0.01% 2488
2022
Q2 		$178K Sell
1,100
-300
-21% -$47.4K ﹤0.01% 4755
2022
Q1 		$263K Hold
1,400
– – ﹤0.01% 4730
2021
Q4 		$370K Buy
1,400
+500
+56% +$135K ﹤0.01% 4247
2021
Q3 		$179K Hold
900
– – ﹤0.01% 5776
2021
Q2 		$179K Buy
+900
New +$175K ﹤0.01% 5864
2021
Q1 		– Sell
-138
Closed -$2.64M – 9837
2020
Q4 		$2.64M Sell
138
-29
-17% -$5.28K ﹤0.01% 1486
2020
Q3 		$2.46M Sell
167
-51
-23% -$7.29K ﹤0.01% 1358
2020
Q2 		$2.69M Buy
218
+51
+31% +$6K ﹤0.01% 1275
2020
Q1 		$1.61M Sell
167
-339
-67% -$32.7K ﹤0.01% 1460
2019
Q4 		$4.68M Buy
506
+106
+27% +$8.9K 0.01% 845
2019
Q3 		$3.07M Buy
400
+101
+34% +$8.83K 0.01% 1006
2019
Q2 		$2.57M Buy
299
+162
+118% +$11K 0.01% 1112
2019
Q1 		$809K Buy
137
+18
+15% +$1.03K ﹤0.01% 2176
2018
Q4 		$627K Buy
119
+79
+198% +$4.63K ﹤0.01% 2027
2018
Q3 		$221K Buy
+40
New +$2.06K ﹤0.01% 3543
2018
Q1 		– Sell
-57
Closed -$21K – 6742
2017
Q4 		$21K Sell
57
-18
-24% -$652 ﹤0.01% 3266
2017
Q3 		$24K Buy
75
+16
+27% +$671 ﹤0.01% 2992
2017
Q2 		$19K Sell
59
-74
-56% -$2.81K ﹤0.01% 3351
2017
Q1 		$35K Buy
133
+58
+77% +$1.84K ﹤0.01% 2694
2016
Q4 		$3K Hold
75
– – ﹤0.01% 4790
2016
Q3 		$3K Sell
75
-47
-39% -$1.42K ﹤0.01% 4728
2016
Q2 		$20K Buy
122
+68
+126% +$1.74K ﹤0.01% 2904
2016
Q1 		$9K Buy
54
+30
+125% +$734 ﹤0.01% 3589
2015
Q4 		$5K Buy
24
+17
+243% +$490 ﹤0.01% 3894
2015
Q3 		$2K Buy
+7
New +$253 ﹤0.01% 4710

Other funds holding RGEN

BlackRock
BlackRock New York $5.72T AUM 30.48% 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
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $544B AUM 28.31% 1-Year Est. Return
MC
Maverick Capital Dallas, Texas $8.67B AUM 48.76% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return

Simplex Trading's RGEN Position: Q1 2026 in Review

Simplex Trading opened a new position in Repligen (RGEN) in Q1 2026: 903 shares worth $106K. The stake represents ﹤0.01% of the portfolio and ranks #5009 among its holdings. This is a return to the name: Simplex Trading previously reported a position in RGEN as recently as Q3 2025.

Simplex Trading first reported a position in RGEN in Q3 2015 and has held it in 18 quarters since. The position peaked at $885K in Q2 2024. 441 funds tracked by Wall St. Rank hold RGEN as of Q1 2026.

  • Simplex Trading held 903 shares of Repligen worth $106K as of Q1 2026.
  • Repligen was a new Simplex Trading position in Q1 2026.
  • Repligen made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #5009 holding.
  • Simplex Trading first reported a position in Repligen in Q3 2015 and has held it in 18 quarters since.
  • Simplex Trading's Repligen position peaked at $885K in Q2 2024.
  • 441 funds tracked by Wall St. Rank held Repligen as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.