Repligen Corporation
US ˙ NasdaqGS ˙ US7599161095

SecurityRGEN / Repligen Corporation
InstitutionFirst Manhattan Co
Latest Disclosed Ownership6,550 shares
Latest Disclosed Value $ 771,721
First Manhattan Co ownership in RGEN / Repligen Corporation

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 6,550 shares of Repligen Corporation (US:RGEN) valued at $771,721 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 6,550 shares of Repligen Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $797,332 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 6,550 0 0.00 772 -28.15 0.0021
2026-02-17 2025-12-31 13F REPLIGEN COM 759916109 6,550 0 0.00 1,073 22.63 0.0028
2025-11-14 2025-09-30 13F REPLIGEN COM 759916109 6,550 0 0.00 876 7.49 0.0023
2025-08-14 2025-06-30 13F REPLIGEN COM 759916109 6,550 0 0.00 815 -2.28 0.0023
2025-05-15 2025-03-31 13F REPLIGEN COM 759916109 6,550 0 0.00 833 -11.57 0.0024
2025-02-14 2024-12-31 13F REPLIGEN COM 759916109 6,550 0 0.00 943 -3.29 0.0028
2024-11-14 2024-09-30 13F REPLIGEN COM 759916109 6,550 -1 -0.02 975 18.06 0.0029
2024-08-15 2024-06-30 13F/A-1 REPLIGEN COM 759916109 6,551 -79 -1.19 826 -32.32 0.0026
2024-08-14 2024-06-30 13F REPLIGEN COM 759916109 6,551 -79 826 0.0026
2024-05-15 2024-03-31 13F REPLIGEN COM 759916109 6,630 0 0.00 1,219 2.27 0.0040
2024-02-13 2023-12-31 13F REPLIGEN COM 759916109 6,630 -1,029 -13.44 1,192 -2.05 0.0041
2023-11-14 2023-09-30 13F REPLIGEN COM 759916109 7,659 501 7.00 1,218 20.26 0.0045
2023-08-14 2023-06-30 13F REPLIGEN COM 759916109 7,158 0 0.00 1,013 -16.02 0.0037
2023-05-15 2023-03-31 13F REPLIGEN COM 759916109 7,158 0 0.00 1,205 -0.50 0.0046
2023-02-14 2022-12-31 13F REPLIGEN COM 759916109 7,158 1,063 17.44 1,212 6.23 0.0044
2022-11-14 2022-09-30 13F REPLIGEN COM 759916109 6,095 -4,000 -39.62 1,140 -30.45 0.0048
2022-08-15 2022-06-30 13F REPLIGEN COM 759916109 10,095 0 0.00 1,639 -13.65 0.0066
2022-05-16 2022-03-31 13F REPLIGEN COM 759916109 10,095 580 6.10 1,898 -24.65 0.0062
2022-02-14 2021-12-31 13F REPLIGEN COM 759916109 9,515 0 0.00 2,519 -8.37 0.0083
2021-11-15 2021-09-30 13F REPLIGEN COM 759916109 9,515 0 0.00 2,749 44.76 0.0101
2021-08-16 2021-06-30 13F REPLIGEN COM 759916109 9,515 0 0.00 1,899 2.70 0.0069
2021-05-14 2021-03-31 13F REPLIGEN COM 759916109 9,515 580 6.49 1,849 8.00 0.0080
2021-02-16 2020-12-31 13F REPLIGEN COM 759916109 8,935 0 0.00 1,712 29.89 0.0082
2020-11-12 2020-09-30 13F REPLIGEN COMMON 759916109 8,935 0 0.00 1,318 19.38 0.0068
2020-08-14 2020-06-30 13F REPLIGEN COMMON 759916109 8,935 0 0.00 1,104 28.07 0.0064
2020-05-06 2020-03-31 13F REPLIGEN COMMON 759916109 8,935 -1,000 -10.07 862 -6.10 0.0056
2020-02-13 2019-12-31 13F REPLIGEN COMMON 759916109 9,935 0 0.00 918 20.63 0.0046
2019-11-13 2019-09-30 13F REPLIGEN COMMON 759916109 9,935 -565 -5.38 761 -15.63 0.0042
2019-08-16 2019-06-30 13F REPLIGEN COMMON 759916109 10,500 0 0.00 902 45.48 0.0050
2019-04-12 2019-03-31 13F REPLIGEN COMMON 759916109 10,500 0 0.00 620 12.12 0.0036
2019-01-30 2018-12-31 13F REPLIGEN COMMON 759916109 10,500 0 0.00 553 -4.98 0.0034
2018-10-15 2018-09-30 13F REPLIGEN COMMON 759916109 10,500 0 0.00 582 18.05 0.0031
2018-08-01 2018-06-30 13F REPLIGEN COMMON 759916109 10,500 0 0.00 493 30.08 0.0028
2018-04-20 2018-03-31 13F REPLIGEN COMMON 759916109 10,500 0 0.00 379 -0.26 0.0022
2018-01-22 2017-12-31 13F REPLIGEN COMMON 759916109 10,500 1,500 16.67 380 10.47 0.0021
2017-10-25 2017-09-30 13F REPLIGEN COMMON 759916109 9,000 500 5.88 344 -2.27 0.0020
2017-08-10 2017-06-30 13F/A-2 REPLIGEN COMMON 759916109 8,500 0 0.00 352 17.73 0.0021
2017-08-01 2017-06-30 13F/A-1 REPLIGEN COMMON 759916109 8,500 0 352 0.0021
2017-07-28 2017-06-30 13F REPLIGEN COMMON 759916109 8,500 0 352
2017-04-25 2017-03-31 13F/A-1 REPLIGEN COMMON 759916109 8,500 0 0.00 299 14.56 0.0018
2017-04-24 2017-03-31 13F REPLIGEN COMMON 759916109 10,000 301
2017-01-25 2016-12-31 13F REPLIGEN COMMON 759916109 8,500 -1,500 -15.00 261 -13.29 0.0016
2016-10-20 2016-09-30 13F REPLIGEN COMMON 759916109 10,000 -4,275 -29.95 301 -22.82 0.0018
2016-07-14 2016-06-30 13F REPLIGEN COMMON 759916109 14,275 0 0.00 390 2.09 0.0024
2016-04-22 2016-03-31 13F REPLIGEN COMMON 759916109 14,275 4,275 42.75 382 35.46 0.0024
2016-01-20 2015-12-31 13F REPLIGEN COMMON 759916109 10,000 -2,000 -16.67 282 -15.57 0.0017
2015-10-26 2015-09-30 13F REPLIGEN COMMON 759916109 12,000 0 0.00 334 -32.53 0.0021
2015-07-17 2015-06-30 13F REPLIGEN COMMON 759916109 12,000 2,000 20.00 495 63.37 0.0029
2015-04-30 2015-03-31 13F REPLIGEN COMMON 759916109 10,000 -2,000 -16.67 303 27.85 0.0017
2015-01-20 2014-12-31 13F REPLIGEN COMMON 759916109 12,000 0 0.00 237 -0.42 0.0013
2014-10-23 2014-09-30 13F REPLIGEN COMMON 759916109 12,000 0 0.00 238 -12.82 0.0014
2014-08-14 2014-06-30 13F/A-1 REPLIGEN COMMON 759916109 12,000 12,000 273 0.0017
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.