Repligen Corporation
US ˙ NasdaqGS ˙ US7599161095

SecurityRGEN / Repligen Corporation
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership831,792 shares
Latest Disclosed Value $ 136,297,437
Alliancebernstein L.p. reports 16.39% decrease in ownership of RGEN / Repligen Corporation

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 831,792 shares of Repligen Corporation (US:RGEN) valued at $98,001,733 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 994,869 shares of Repligen Corporation. This represents a change in shares of -16.39% during the quarter. The current value of the position is $105,263,278 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F REPLIGEN COM 759916109 831,792 -163,077 -16.39 136,297 -16.39 0.0369
2026-02-17 2025-12-31 13F REPLIGEN COM 759916109 994,869 -109,302 -9.90 163,019 10.45 0.0515
2025-11-14 2025-09-30 13F REPLIGEN COM 759916109 1,104,171 197,778 21.82 147,595 30.92 0.0465
2025-08-14 2025-06-30 13F REPLIGEN COM 759916109 906,393 -117,787 -11.50 112,737 -13.49 0.0368
2025-05-15 2025-03-31 13F REPLIGEN COM 759916109 1,024,180 13,284 1.31 130,317 -10.44 0.0471
2025-02-12 2024-12-31 13F REPLIGEN COM 759916109 1,010,896 191,439 23.36 145,508 19.32 0.0494
2024-11-14 2024-09-30 13F REPLIGEN COM 759916109 819,457 -4,287 -0.52 121,952 17.44 0.0410
2024-08-14 2024-06-30 13F REPLIGEN COM 759916109 823,744 -20,002 -2.37 103,841 -33.08 0.0362
2024-05-14 2024-03-31 13F REPLIGEN COM 759916109 843,746 66,721 8.59 155,182 11.07 0.0549
2024-02-14 2023-12-31 13F REPLIGEN COM 759916109 777,025 -8,082 -1.03 139,709 11.91 0.0538
2023-11-14 2023-09-30 13F REPLIGEN COM 759916109 785,107 17,540 2.29 124,840 14.97 0.0531
2023-08-15 2023-06-30 13F REPLIGEN COM 759916109 767,567 -104,967 -12.03 108,580 -26.09 0.0443
2023-05-15 2023-03-31 13F REPLIGEN COM 759916109 872,534 -206,571 -19.14 146,900 -19.60 0.0629
2023-02-15 2022-12-31 13F REPLIGEN COM 759916109 1,079,105 267,436 32.95 182,703 20.30 0.0822
2022-11-15 2022-09-30 13F REPLIGEN COM 759916109 811,669 -348,815 -30.06 151,871 -19.42 0.0735
2022-08-15 2022-06-30 13F REPLIGEN COM 759916109 1,160,484 -123,101 -9.59 188,463 -21.94 0.0861
2022-05-13 2022-03-31 13F REPLIGEN COM 759916109 1,283,585 241,386 23.16 241,430 -12.53 0.0932
2022-02-14 2021-12-31 13F REPLIGEN COM 759916109 1,042,199 -97,319 -8.54 276,016 -16.18 0.0976
2021-11-10 2021-09-30 13F REPLIGEN COM 759916109 1,139,518 -127,112 -10.04 329,309 30.24 0.1299
2021-07-30 2021-06-30 13F REPLIGEN COM 759916109 1,266,630 144,624 12.89 252,845 15.92 0.1015
2021-05-06 2021-03-31 13F REPLIGEN COM 759916109 1,122,006 36,479 3.36 218,129 4.86 0.0957
2021-02-08 2020-12-31 13F REPLIGEN COM 759916109 1,085,527 -45,346 -4.01 208,020 24.68 0.0982
2020-11-12 2020-09-30 13F REPLIGEN COM 759916109 1,130,873 -233,168 -17.09 166,849 -1.04 0.0898
2020-08-13 2020-06-30 13F REPLIGEN COM 759916109 1,364,041 382,998 39.04 168,609 78.03 0.0991
2020-05-14 2020-03-31 13F REPLIGEN COM 759916109 981,043 816,822 497.39 94,710 523.50 0.0679
2020-02-18 2019-12-31 13F REPLIGEN COM 759916109 164,221 9,150 5.90 15,190 27.73 0.0086
2019-11-14 2019-09-30 13F REPLIGEN COM 759916109 155,071 38,140 32.62 11,892 18.33 0.0074
2019-08-14 2019-06-30 13F REPLIGEN COM 759916109 116,931 23,690 25.41 10,050 82.43 0.0062
2019-05-14 2019-03-31 13F REPLIGEN COM 759916109 93,241 -5,300 -5.38 5,509 6.00 0.0036
2019-02-13 2018-12-31 13F REPLIGEN COM 759916109 98,541 36,211 58.10 5,197 50.33 0.0039
2018-11-08 2018-09-30 13F REPLIGEN COM 759916109 62,330 0 0.00 3,457 17.91 0.0023
2018-08-13 2018-06-30 13F REPLIGEN COM 759916109 62,330 8,300 15.36 2,932 49.97 0.0020
2018-05-14 2018-03-31 13F REPLIGEN COM 759916109 54,030 1,900 3.64 1,955 3.38 0.0014
2018-02-13 2017-12-31 13F REPLIGEN COM 759916109 52,130 0 0.00 1,891 -5.36 0.0014
2017-11-13 2017-09-30 13F REPLIGEN COM 759916109 52,130 -25,330 -32.70 1,998 -37.76 0.0015
2017-08-10 2017-06-30 13F REPLIGEN COM 759916109 77,460 26,230 51.20 3,210 78.04 0.0025
2017-05-11 2017-03-31 13F REPLIGEN COM 759916109 51,230 -56,770 -52.56 1,803 -45.84 0.0014
2017-02-13 2016-12-31 13F REPLIGEN COM 759916109 108,000 -26,160 -19.50 3,329 -17.80 0.0028
2016-11-10 2016-09-30 13F REPLIGEN COM 759916109 134,160 38,180 39.78 4,050 54.23 0.0034
2016-08-11 2016-06-30 13F REPLIGEN COM 759916109 95,980 29,790 45.01 2,626 47.94 0.0023
2016-05-13 2016-03-31 13F REPLIGEN COM 759916109 66,190 10,730 19.35 1,775 13.13 0.0015
2016-02-16 2015-12-31 13F/A-1 REPLIGEN COM 759916109 55,460 230 0.42 1,569 2.02 0.0013
2016-02-12 2015-12-31 13F REPLIGEN COM 759916109 55,460 1,545
2015-11-13 2015-09-30 13F REPLIGEN COM 759916109 55,230 -70 -0.13 1,538 -32.60 0.0013
2015-08-14 2015-06-30 13F REPLIGEN COM 759916109 55,300 4,400 8.64 2,282 47.70 0.0019
2015-05-13 2015-03-31 13F REPLIGEN COM 759916109 50,900 0 0.00 1,545 53.27 0.0013
2015-02-13 2014-12-31 13F REPLIGEN COM 759916109 50,900 0 0.00 1,008 -0.49 0.0008
2014-11-13 2014-09-30 13F REPLIGEN COM 759916109 50,900 0 0.00 1,013 -12.67 0.0009
2014-08-13 2014-06-30 13F REPLIGEN COM 759916109 50,900 31,400 161.03 1,160 362.15 0.0010
2014-05-13 2014-03-31 13F REPLIGEN COM 759916109 19,500 16,900 650.00 251 617.14 0.0002
2014-02-13 2013-12-31 13F REPLIGEN COM 759916109 2,600 -4,400 -62.86 35 -55.13 0.0000
2013-11-14 2013-09-30 13F REPLIGEN COM 759916109 7,000 -2,773 -28.37 78 -3.70 0.0001
2013-08-13 2013-06-30 13F REPLIGEN COM 759916109 9,773 9,773 81 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.