Citadel Advisors
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Citadel Advisors’s Repligen RGEN Stock Holding History

Citadel Advisors’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 		$2.67M Buy
22,700
+11,300
+99% +$1.58M ﹤0.01% 5493
2025
Q4 		$1.87M Sell
11,400
-28,200
-71% -$4.42M ﹤0.01% 6060
2025
Q3 		$5.29M Sell
39,600
-6,800
-15% -$826K ﹤0.01% 4262
2025
Q2 		$5.77M Buy
46,400
+17,000
+58% +$2.16M ﹤0.01% 3870
2025
Q1 		$3.74M Buy
29,400
+3,400
+13% +$523K ﹤0.01% 4368
2024
Q4 		$3.74M Buy
26,000
+7,400
+40% +$1.06M ﹤0.01% 4453
2024
Q3 		$2.77M Buy
18,600
+6,100
+49% +$875K ﹤0.01% 4939
2024
Q2 		$1.58M Sell
12,500
-34,600
-73% -$5.42M ﹤0.01% 5754
2024
Q1 		$8.66M Buy
47,100
+24,900
+112% +$4.74M ﹤0.01% 3121
2023
Q4 		$3.99M Buy
22,200
+8,100
+57% +$1.26M ﹤0.01% 4129
2023
Q3 		$2.24M Sell
14,100
-27,700
-66% -$4.53M ﹤0.01% 5024
2023
Q2 		$5.91M Buy
41,800
+20,200
+94% +$3.24M ﹤0.01% 3389
2023
Q1 		$3.64M Sell
21,600
-13,900
-39% -$2.48M ﹤0.01% 4339
2022
Q4 		$6.01M Buy
35,500
+3,700
+12% +$671K ﹤0.01% 3566
2022
Q3 		$5.95M Buy
31,800
+5,700
+22% +$1.2M ﹤0.01% 3580
2022
Q2 		$4.24M Sell
26,100
-8,900
-25% -$1.41M ﹤0.01% 4119
2022
Q1 		$6.58M Sell
35,000
-13,800
-28% -$2.62M ﹤0.01% 3649
2021
Q4 		$12.9M Sell
48,800
-19,800
-29% -$5.33M ﹤0.01% 2649
2021
Q3 		$19.8M Buy
68,600
+40,200
+142% +$10.3M ﹤0.01% 2004
2021
Q2 		$5.67M Sell
28,400
-4,500
-14% -$873K ﹤0.01% 4166
2021
Q1 		$6.4M Buy
32,900
+900
+3% +$185K ﹤0.01% 3762
2020
Q4 		$6.13M Buy
32,000
+22,800
+248% +$4.15M ﹤0.01% 3343
2020
Q3 		$1.36M Sell
9,200
-52,600
-85% -$7.52M ﹤0.01% 5462
2020
Q2 		$7.64M Buy
61,800
+41,900
+211% +$4.93M ﹤0.01% 2543
2020
Q1 		$1.92M Buy
19,900
+1,700
+9% +$164K ﹤0.01% 4203
2019
Q4 		$1.68M Sell
18,200
-11,100
-38% -$932K ﹤0.01% 4696
2019
Q3 		$2.25M Buy
29,300
+7,100
+32% +$621K ﹤0.01% 4299
2019
Q2 		$1.91M Buy
22,200
+7,400
+50% +$504K ﹤0.01% 4585
2019
Q1 		$874K Sell
14,800
-600
-4% -$34.5K ﹤0.01% 5828
2018
Q4 		$812K Sell
15,400
-5,800
-27% -$340K ﹤0.01% 5611
2018
Q3 		$1.18M Buy
21,200
+16,200
+324% +$835K ﹤0.01% 5266
2018
Q2 		$235K Buy
+5,000
New +$206K ﹤0.01% 7617
2018
Q1 		– Sell
-7,500
Closed -$272K – 8697
2017
Q4 		$272K Sell
7,500
-1,800
-19% -$65.2K ﹤0.01% 6618
2017
Q3 		$356K Buy
9,300
+3,700
+66% +$155K ﹤0.01% 5803
2017
Q2 		$232K Buy
+5,600
New +$213K ﹤0.01% 6337
2016
Q4 		– Sell
-10,200
Closed -$308K – 7742
2016
Q3 		$308K Sell
10,200
-900
-8% -$27.2K ﹤0.01% 5636
2016
Q2 		$304K Sell
11,100
-4,500
-29% -$115K ﹤0.01% 5197
2016
Q1 		$418K Buy
15,600
+13,100
+524% +$321K ﹤0.01% 4651
2015
Q4 		$71K Sell
2,500
-600
-19% -$17.3K ﹤0.01% 7020
2015
Q3 		$86K Buy
3,100
+600
+24% +$21.7K ﹤0.01% 7105
2015
Q2 		$103K Sell
2,500
-2,300
-48% -$84.3K ﹤0.01% 7042
2015
Q1 		$146K Sell
4,800
-800
-14% -$20.7K ﹤0.01% 6522
2014
Q4 		$111K Sell
5,600
-5,700
-50% -$127K ﹤0.01% 6565
2014
Q3 		$225K Buy
11,300
+7,100
+169% +$149K ﹤0.01% 5604
2014
Q2 		$96K Sell
4,200
-1,300
-24% -$23.1K ﹤0.01% 6259
2014
Q1 		$71K Buy
5,500
+2,900
+112% +$41.6K ﹤0.01% 6484
2013
Q4 		$35K Sell
2,600
-2,700
-51% -$32.2K ﹤0.01% 6221
2013
Q3 		$59K Buy
+5,300
New +$52.7K ﹤0.01% 5690

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

Citadel Advisors's RGEN Position: Q1 2026 in Review

Citadel Advisors reduced its Repligen (RGEN) stake by 21% in Q1 2026, selling an estimated $41.2M and leaving 1,099,181 shares worth $130M. The position accounts for 0.02% of the portfolio, ranked #659.

Citadel Advisors first reported a position in RGEN in Q2 2013 and has held it in 48 quarters since. The position peaked at $228M in Q4 2025. 442 funds tracked by Wall St. Rank hold RGEN as of Q1 2026.

  • Citadel Advisors held 1,099,181 shares of Repligen worth $130M as of Q1 2026.
  • Citadel Advisors sold 295,071 Repligen shares in Q1 2026, an estimated $41.2M.
  • Repligen made up 0.02% of Citadel Advisors's portfolio in Q1 2026, its #659 holding.
  • Citadel Advisors first reported a position in Repligen in Q2 2013 and has held it in 48 quarters since.
  • Citadel Advisors's Repligen position peaked at $228M in Q4 2025.
  • 442 funds tracked by Wall St. Rank held Repligen as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.