Quick Takeaways
- RGEN - REPLIGEN CORP has 18 insiders with reported activity on this page.
- Net insider value flow over the last year: -$15,165,011.
- Recent transaction rows are available for direct filing-level review.
- Info
- Insider Trading
- Financials
- Holders
Insider Transactions Reported by 18 Insiders of REPLIGEN CORP
- Symbol
- RGEN on Nasdaq
- Location
- Waltham, MA
What Changed
- Buy value: $201,830; sell value: $15,366,840.
- Net share flow: -108,265.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$15,165,011.
Buys
$201,830
Shares: 1,800
Insiders: 1
Sells
$15,366,841
Shares: 110,065
Insiders: 4
Net
-$15,165,011
Shares: -108,265
Insiders: -3
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 54,507 | $0 | $8,586,764 | -$8,586,764 |
| 6-9 | 1,800 | 29,111 | $201,830 | $3,508,389 | -$3,306,559 |
| 9-12 | 0 | 26,447 | $0 | $3,271,688 | -$3,271,688 |
REPLIGEN CORP executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Karen A. Dawes | Director | $14,783,181 | -$44,275 | -0.3% | Filing P/S | 17 Dec 2025 |
| Anthony Hunt | Director | $11,130,078 | -$13,794,295 | -55% | Mixed | 02 Mar 2026 |
| Olivier Loeillot | Chief Executive Officer | $7,969,463 | -$1,196,970 | -13% | Mixed | 05 Mar 2026 |
| Jon Snodgres | Chief Financial Officer | $5,499,867 | Mixed | 16 May 2023 | ||
| Christine Gebski | SVP, Filtration & Chromatography | $4,478,619 | Mixed | 14 May 2024 | ||
| James Bylund | Chief Operating Officer | $3,488,544 | -$331,301 | -8.7% | Mixed | 05 Mar 2026 |
| Jason K. Garland | Cfo | $2,757,024 | Mixed | 05 Mar 2026 | ||
| Ralf Kuriyel | Senior VP, R&D | $2,752,907 | Mixed | 05 Mar 2026 | ||
| Brian Robb Douglass | Chief Product Officer | $1,039,625 | Mixed | 02 Mar 2026 | ||
| Glenn P. Muir | Director | $956,566 | Mixed | 16 Dec 2025 | ||
| Martin D. Madaus | Director | $928,432 | +$201,830 | +28% | Mixed | 08 Aug 2025 |
| Manner Carrie Eglinton | Director | $622,694 | Mixed | 15 May 2025 | ||
| Nicolas Barthelemy | Director | $619,208 | Mixed | 15 May 2025 | ||
| Rohin Mhatre | Director | $560,369 | Mixed | 15 May 2025 | ||
| Violetta Hughes | Chief Accounting Officer | $526,655 | Mixed | 02 Sep 2025 | ||
| Konstantin Konstantinov | Director | $403,510 | Mixed | 15 May 2025 | ||
| Margaret Pax | Director | $281,090 | Mixed | 15 May 2025 | ||
| Thomas F. Ryan Jr. | Director | $214,368 | Mixed | 01 Mar 2022 |
Top shareholders of REPLIGEN CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
|
Company |
9.3%
from 13D/G
|
6,619,271
|
$1,084,633,737 | — | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
8.9%
|
4,993,945
|
$818,307,828 | — | 31 Dec 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
|
T. Rowe Price Associates, Inc. · Company |
8.2%
|
4,599,860
|
$753,733,060 | +$191,767,488 | 31 Dec 2025 | |
| FMR LLC |
13D/G
13F
|
Company |
5.1%
|
2,891,140
|
$473,742,228 | $0 | 31 Dec 2025 | |
| UNITED CAPITAL FINANCIAL ADVISORS, LLC |
13F
|
Company |
4.9%
|
2,770,862
|
$454,033,447 | — | 31 Dec 2025 | |
| Roy T. Eddleman Living Trust |
13D/G
|
— |
4.8%
|
2,705,689
|
$443,354,200 | $0 | 31 Dec 2025 | |
| Roy T. Eddleman |
13D/G
|
Roy T. Eddleman Living Trust |
4.8%
|
2,705,689
|
$377,254,217 | $0 | 31 Dec 2024 | |
| STATE STREET CORP |
13F
|
Company |
3.1%
|
1,719,093
|
$281,690,579 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
2.5%
|
1,394,252
|
$228,462,133 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
2.4%
|
1,344,706
|
$220,343,507 | — | 31 Dec 2025 | |
| Invesco Ltd. |
13F
|
Company |
2.2%
|
1,256,439
|
$205,880,096 | — | 31 Dec 2025 | |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ |
13F
|
Company |
2.2%
|
1,215,527
|
$199,176,255 | — | 31 Dec 2025 | |
| FRANKLIN RESOURCES INC |
13F
|
Company |
2%
|
1,101,447
|
$180,483,177 | — | 31 Dec 2025 | |
| RTW INVESTMENTS, LP |
13F
|
Company |
1.9%
|
1,064,000
|
$174,347,040 | — | 31 Dec 2025 | |
| Conestoga Capital Advisors, LLC |
13F
|
Company |
1.9%
|
1,057,975
|
$173,359,783 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.8%
|
1,029,817
|
$168,778,619 | — | 31 Dec 2025 | |
| Point72 Asset Management, L.P. |
13F
|
Company |
1.8%
|
1,006,310
|
$164,893,957 | — | 31 Dec 2025 | |
| Champlain Investment Partners, LLC |
13F
|
Company |
1.8%
|
1,003,951
|
$164,507,411 | — | 31 Dec 2025 | |
| ALLIANCEBERNSTEIN L.P. |
13F
|
Company |
1.8%
|
994,869
|
$163,019,234 | — | 31 Dec 2025 | |
| Holocene Advisors, LP |
13F
|
Company |
1.7%
|
961,040
|
$157,476,014 | — | 31 Dec 2025 | |
| FRED ALGER MANAGEMENT, LLC |
13F
|
Company |
1.6%
|
911,527
|
$149,362,814 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
1.4%
|
804,410
|
$131,820,884 | — | 31 Dec 2025 | |
| CONGRESS ASSET MANAGEMENT CO |
13F
|
Company |
1.3%
|
746,306
|
$122,289,701 | — | 31 Dec 2025 | |
| Stephens Investment Management Group LLC |
13F
|
Company |
1.2%
|
657,111
|
$107,674,208 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
1.2%
|
650,546
|
$106,598,468 | — | 31 Dec 2025 | |
| T. Rowe Price Investment Management, Inc. |
13F
|
Company |
1.2%
|
646,122
|
$105,874,000 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
1%
|
570,977
|
$93,560,643 | — | 31 Dec 2025 | |
| GENEVA CAPITAL MANAGEMENT LLC |
13F
|
Company |
1%
|
562,975
|
$92,249,110 | — | 31 Dec 2025 | |
| BAMCO INC /NY/ |
13F
|
Company |
0.97%
|
544,779
|
$89,267,487 | — | 31 Dec 2025 | |
| VOYA INVESTMENT MANAGEMENT LLC |
13F
|
Company |
0.93%
|
521,158
|
$85,396,950 | — | 31 Dec 2025 | |
| MARSHALL WACE, LLP |
13F
|
Company |
0.92%
|
516,336
|
$84,606,816 | — | 31 Dec 2025 | |
| DF DENT & CO INC |
13F
|
Company |
0.88%
|
495,550
|
$81,200,789 | — | 31 Dec 2025 | |
| AMERIPRISE FINANCIAL INC |
13F
|
Company |
0.88%
|
494,225
|
$80,983,934 | — | 31 Dec 2025 | |
| NORGES BANK |
13F
|
Company |
0.82%
|
462,094
|
$75,718,723 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.8%
|
446,148
|
$73,105,812 | — | 31 Dec 2025 | |
| SCHRODER INVESTMENT MANAGEMENT GROUP |
13F
|
Company |
0.79%
|
443,934
|
$72,743,026 | — | 31 Dec 2025 | |
| TimesSquare Capital Management, LLC |
13F
|
Company |
0.78%
|
435,687
|
$71,391,672 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.77%
|
430,704
|
$70,575,157 | — | 31 Dec 2025 | |
| Walleye Capital LLC |
13F
|
Company |
0.74%
|
417,110
|
$68,347,645 | — | 31 Dec 2025 | |
| Impax Asset Management Group plc |
13F
|
Company |
0.74%
|
413,384
|
$67,737,102 | — | 31 Dec 2025 | |
| THRIVENT FINANCIAL FOR LUTHERANS |
13F
|
Company |
0.73%
|
411,706
|
$67,463,000 | — | 31 Dec 2025 | |
| Artemis Investment Management LLP |
13F
|
Company |
0.73%
|
410,369
|
$67,243,064 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.71%
|
397,229
|
$65,089,945 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
0.62%
|
348,388
|
$57,086,857 | — | 31 Dec 2025 | |
| AMERICAN CAPITAL MANAGEMENT INC |
13F
|
Company |
0.6%
|
335,115
|
$54,911,944 | — | 31 Dec 2025 | |
| BNP Paribas Asset Management Holding S.A. |
13F
|
Company |
0.58%
|
323,821
|
$53,061,000 | — | 31 Dec 2025 | |
| Iron Triangle Partners LP |
13F
|
Company |
0.57%
|
320,474
|
$52,512,870 | — | 31 Dec 2025 | |
| PERCEPTIVE ADVISORS LLC |
13F
|
Company |
0.56%
|
315,541
|
$51,704,548 | — | 31 Dec 2025 | |
| RIVERBRIDGE PARTNERS LLC |
13F
|
Company |
0.56%
|
313,365
|
$51,347,920 | — | 31 Dec 2025 | |
| Allspring Global Investments Holdings, LLC |
13F
|
Company |
0.55%
|
311,175
|
$51,141,612 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for REPLIGEN CORP
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Ralf Kuriyel | RGEN | Common Stock | Award | 35.8% | 5,284 | 20,062 | 05 Mar 2026 | Direct | ||
| Ralf Kuriyel | RGEN | Stock Option (Right to Buy) | Award | 5,669 | 5,669 | 05 Mar 2026 | Direct | |||
| Olivier Loeillot | RGEN | Common Stock | Award | 71.1% | 24,134 | 58,078 | 05 Mar 2026 | Direct | ||
| Olivier Loeillot | RGEN | Stock Option (Right to Buy) | Award | 25,890 | 25,890 | 05 Mar 2026 | Direct | |||
| James Bylund | RGEN | Common Stock | Award | 43.9% | 7,751 | 25,423 | 05 Mar 2026 | Direct | ||
| James Bylund | RGEN | Stock Option (Right to Buy) | Award | 8,315 | 8,315 | 05 Mar 2026 | Direct | |||
| Jason K. Garland | RGEN | Common Stock | Award | 62.8% | 7,751 | 20,092 | 05 Mar 2026 | Direct | ||
| Jason K. Garland | RGEN | Stock Option (Right to Buy) | Award | 8,315 | 8,315 | 05 Mar 2026 | Direct | |||
| James Bylund | RGEN | Common Stock | Tax liability | -0.35% | -62 | 17,672 | 04 Mar 2026 | Direct | ||
| James Bylund | RGEN | Common Stock | Award | 0.71% | 125 | 17,734 | 04 Mar 2026 | Direct | ||
| Ralf Kuriyel | RGEN | Common Stock | Tax liability | -0.28% | -42 | 14,778 | 04 Mar 2026 | Direct | ||
| Ralf Kuriyel | RGEN | Common Stock | Award | 0.85% | 125 | 14,820 | 04 Mar 2026 | Direct | ||
| James Bylund | RGEN | Common Stock | Tax liability | -12.1% | -2,433 | 17,609 | 02 Mar 2026 | Direct | ||
| Olivier Loeillot | RGEN | Common Stock | Tax liability | -4.53% | -1,610 | 33,944 | 02 Mar 2026 | Direct | ||
| Anthony Hunt | RGEN | Common Stock | Tax liability | -10% | -9,897 | 89,062 | 02 Mar 2026 | Direct | ||
| Jason K. Garland | RGEN | Common Stock | Tax liability | -5.48% | -715 | 12,341 | 02 Mar 2026 | Direct | ||
| Ralf Kuriyel | RGEN | Common Stock | Tax liability | -5.91% | -923 | 14,695 | 02 Mar 2026 | Direct | ||
| Brian Robb Douglass | RGEN | Common Stock | Tax liability | -2.59% | -221 | 8,319 | 02 Mar 2026 | Direct | ||
| James Bylund | RGEN | Common Stock | Tax liability | -6.87% | -1,478 | 20,042 | 27 Feb 2026 | Direct | ||
| Olivier Loeillot | RGEN | Common Stock | Tax liability | -0.96% | -344 | 35,554 | 27 Feb 2026 | Direct | ||
| Jason K. Garland | RGEN | Common Stock | Tax liability | -2.44% | -327 | 13,056 | 27 Feb 2026 | Direct | ||
| Ralf Kuriyel | RGEN | Common Stock | Tax liability | -2.76% | -444 | 15,618 | 27 Feb 2026 | Direct | ||
| Brian Robb Douglass | RGEN | Common Stock | Award | 36.6% | 2,288 | 8,540 | 31 Dec 2025 | Direct | ||
| Brian Robb Douglass | RGEN | Stock Option (Right to Buy) | Award | 2,143 | 2,143 | 31 Dec 2025 | Direct | |||
| Karen A. Dawes | RGEN | Common Stock | Sale | -0.3% | $44,275 | $161.00 | -275 | 91,821 | 17 Dec 2025 | Direct |
| Glenn P. Muir | RGEN | Common Stock | Options Exercise | 10.1% | 3,366 | 36,622 | 16 Dec 2025 | Direct | ||
| Glenn P. Muir | RGEN | Stock Option (Right to Buy) | Options Exercise | 3,366 | 3,366 | 16 Dec 2025 | Direct | |||
| Anthony Hunt | RGEN | Common Stock | Other | -1.98% | -2,000 | 98,959 | 04 Dec 2025 | Direct | ||
| Olivier Loeillot | RGEN | Common Stock | Sale | -16.4% | $1,196,970 | $170.00 | -7,041 | 35,898 | 25 Nov 2025 | Direct |
| James Bylund | RGEN | Common Stock | Sale | -9.24% | $331,301 | $151.21 | -2,191 | 21,520 | 18 Nov 2025 | Direct |
| Anthony Hunt | RGEN | Common Stock | Options Exercise | 3.66% | 2,952 | 83,695 | 13 Nov 2025 | Direct | ||
| Anthony Hunt | RGEN | Common Stock | Sale | -19.8% | $3,092,278 | $154.61 | -20,000 | 80,743 | 13 Nov 2025 | Direct |
| Anthony Hunt | RGEN | Stock Option (Right to Buy) | Options Exercise | 25% | 2,952 | 14,760 | 13 Nov 2025 | Direct | ||
| Anthony Hunt | RGEN | Common Stock | Sale | -19.9% | $3,921,940 | $156.88 | -25,000 | 100,743 | 12 Nov 2025 | Direct |
| Anthony Hunt | RGEN | Common Stock | Options Exercise | 24.8% | 25,000 | 125,743 | 12 Nov 2025 | Direct | ||
| Anthony Hunt | RGEN | Stock Option (Right to Buy) | Options Exercise | -13.7% | -25,000 | 157,344 | 12 Nov 2025 | Direct | ||
| Olivier Loeillot | RGEN | Common Stock | Tax liability | -2.82% | -1,248 | 42,939 | 02 Oct 2025 | Direct | ||
| Jason K. Garland | RGEN | Common Stock | Tax liability | -2.99% | -412 | 13,383 | 25 Sep 2025 | Direct | ||
| Anthony Hunt | RGEN | Common Stock | Sale | -22.4% | $3,508,389 | $120.52 | -29,111 | 100,743 | 10 Sep 2025 | Direct |
| Anthony Hunt | RGEN | Common Stock | Options Exercise | 18.2% | 20,000 | 129,854 | 10 Sep 2025 | Direct | ||
| Anthony Hunt | RGEN | Stock Option (Right to Buy) | Options Exercise | -9.88% | -20,000 | 182,344 | 10 Sep 2025 | Direct | ||
| Olivier Loeillot | RGEN | Common Stock | Tax liability | -5.37% | -2,506 | 44,187 | 03 Sep 2025 | Direct | ||
| Violetta Hughes | RGEN | Common Stock | Award | 4,142 | 4,142 | 02 Sep 2025 | Direct | |||
| Violetta Hughes | RGEN | Stock Option (Right to Buy) | Award | 3,914 | 3,914 | 02 Sep 2025 | Direct | |||
| Martin D. Madaus | RGEN | Common Stock | Purchase | $201,830 | $112.13 | 1,800 | 1,800 | 08 Aug 2025 | By Martin D. Madaus 2011 Revocable Trust | |
| Nicolas Barthelemy | RGEN | Common Stock | Award | 28.1% | 973 | 4,441 | 15 May 2025 | Direct | ||
| Nicolas Barthelemy | RGEN | Stock Option (Right to Buy) | Award | 1,800 | 1,800 | 15 May 2025 | Direct | |||
| Konstantin Konstantinov | RGEN | Common Stock | Award | 50.6% | 973 | 2,894 | 15 May 2025 | Direct | ||
| Konstantin Konstantinov | RGEN | Stock Option (Right to Buy) | Award | 1,800 | 1,800 | 15 May 2025 | Direct | |||
| Glenn P. Muir | RGEN | Common Stock | Award | 3.01% | 973 | 33,256 | 15 May 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.