Repligen Corp (RGEN) · Insider trading

What Repligen's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months

0 insiders, 0 trades

Sold, 12 months

$15.26M

5 insiders, 77% under a plan

Net, 12 months

−$15.26M

bought less sold

Latest filing

2026-10-08

filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

Bought Sold Largest month: $8.54M

Who traded, two years

Insider	Bought	Sold	Trades	Last trade	Holds after
Hunt AnthonyDirector	–	$21.26M	30	2025-11-13	98,959
Loeillot OlivierDirector, Chief Executive Officer	–	$7.69M	9	2026-10-05	45,788
Bylund JamesChief Operating Officer	–	$331,301	1	2025-11-18	21,520
Madaus Martin DDirector	$201,834	–	1	2025-08-08	–
Garland Jason KCFO	–	$185,785	2	2026-07-16	18,829
Dawes Karen ADirector	–	$44,275	1	2025-12-17	91,821
Pax MargaretDirector	$37,672	–	1	2025-03-17	1,043

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

Date	Insider	Trade	Shares	Price	Value	Holds after	Filing
2026-10-05	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	1,333	178.75	$238,274	45,788	Form 4
2026-10-05	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	4,202	190.00	$798,380	45,788	Form 4
2026-09-24	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	8,404	190.00	$1.60M	48,369	Form 4
2026-09-24	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	4,542	190.00	$862,980	48,369	Form 4
2026-09-21	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	5,426	180.00	$976,680	48,369	Form 4
2026-09-04	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	3,035	165.90	$503,506	48,369	Form 4
2026-08-20	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	5,426	180.00	$976,680	54,246	Form 4
2026-07-16	Garland Jason KCFO	Saleplan	530	150.00	$79,500	18,829	Form 4
2026-06-25	Garland Jason KCFO	Saleplan	733	145.00	$106,285	19,359	Form 4
2026-04-21	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	3,832	140.00	$536,480	54,246	Form 4
2025-12-17	Dawes Karen ADirector	Sale	275	161.00	$44,275	91,821	Form 4
2025-11-25	Loeillot OlivierDirector, Chief Executive Officer	Saleplan	7,041	170.00	$1.20M	35,898	Form 4
2025-11-18	Bylund JamesChief Operating Officer	Sale	2,191	151.21	$331,301	21,520	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	1,784	151.01	$269,402	98,959	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	2,100	152.17	$319,557	96,859	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	2,923	153.14	$447,628	93,936	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	2,500	154.32	$385,800	91,436	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	3,000	155.45	$466,350	88,436	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	5,737	156.22	$896,234	82,699	Form 4
2025-11-13	Hunt AnthonyDirector	Sale	1,956	157.11	$307,307	80,743	Form 4
2025-11-12	Hunt AnthonyDirector	Saleplan	3,741	154.92	$579,556	122,002	Form 4
2025-11-12	Hunt AnthonyDirector	Saleplan	4,740	155.85	$738,729	117,262	Form 4
2025-11-12	Hunt AnthonyDirector	Saleplan	4,959	156.65	$776,827	112,303	Form 4
2025-11-12	Hunt AnthonyDirector	Saleplan	11,096	158.01	$1.75M	101,207	Form 4
2025-11-12	Hunt AnthonyDirector	Saleplan	464	158.51	$73,549	100,743	Form 4
2025-09-10	Hunt AnthonyDirector	Sale	96	116.34	$11,169	129,758	Form 4
2025-09-10	Hunt AnthonyDirector	Sale	1,108	118.32	$131,099	128,650	Form 4
2025-09-10	Hunt AnthonyDirector	Sale	3,262	119.64	$390,266	125,388	Form 4
2025-09-10	Hunt AnthonyDirector	Sale	14,882	120.19	$1.79M	110,506	Form 4
2025-09-10	Hunt AnthonyDirector	Sale	7,584	121.42	$920,849	102,922	Form 4
2025-09-10	Hunt AnthonyDirector	Sale	2,179	122.23	$266,339	100,743	Form 4
2025-08-08	Madaus Martin DDirector	Buyindirect	1,800	112.13	$201,834	1,800	Form 4
2025-05-15	Hunt AnthonyDirector	Saleplan	2,043	122.66	$250,594	134,258	Form 4
2025-05-15	Hunt AnthonyDirector	Saleplan	17,596	123.57	$2.17M	116,662	Form 4
2025-05-15	Hunt AnthonyDirector	Saleplan	6,533	124.34	$812,313	110,129	Form 4
2025-05-15	Hunt AnthonyDirector	Saleplan	268	125.20	$33,554	109,861	Form 4
2025-05-15	Hunt AnthonyDirector	Saleplan	7	127.00	$889	109,854	Form 4
2025-03-17	Hunt AnthonyDirector	Saleplan	60	148.05	$8,883	162,997	Form 4
2025-03-17	Hunt AnthonyDirector	Saleplan	100	150.38	$15,038	162,897	Form 4
2025-03-17	Hunt AnthonyDirector	Saleplan	2,518	151.09	$380,445	160,379	Form 4

5 more

2025-03-17	Hunt AnthonyDirector	Saleplan	6,176	151.96	$938,505	154,203	Form 4
2025-03-17	Hunt AnthonyDirector	Saleplan	15,619	152.82	$2.39M	138,584	Form 4
2025-03-17	Hunt AnthonyDirector	Saleplan	2,283	153.70	$350,897	136,301	Form 4
2025-03-17	Pax MargaretDirector	Buy	250	150.69	$37,672	1,043	Form 4
2024-11-21	Hunt AnthonyDirector	Sale	24,246	139.67	$3.39M	139,840	Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

35 × shares withheld for tax31 × grant or award15 × option exercise1 × other

Show them

Date	Insider	What	Shares	Price	Holds after	Filing
2026-10-06	Douglass Brian RobbCHIEF PRODUCT OFFICER	Grant or award A	+700	–	8,685	Form 4
2026-10-05	Loeillot OlivierDirector, Chief Executive Officer	Option exercise M	+4,202	154.96	49,990	Form 4
2026-10-02	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−1,248	181.70	47,121	Form 4
2026-09-25	Garland Jason KCFO	Shares withheld for tax F	−421	189.68	18,408	Form 4
2026-09-24	Loeillot OlivierDirector, Chief Executive Officer	Option exercise M	+8,404	154.96	56,773	Form 4
2026-09-24	Loeillot OlivierDirector, Chief Executive Officer	Option exercise M	+4,542	155.38	52,911	Form 4
2026-09-21	Loeillot OlivierDirector, Chief Executive Officer	Option exercise M	+5,426	141.79	53,795	Form 4
2026-09-03	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−2,842	169.61	51,404	Form 4
2026-09-01	Hughes ViolettaCHIEF ACCOUNTING OFFICER	Shares withheld for tax F	−277	170.02	6,331	Form 4
2026-08-20	Loeillot OlivierDirector, Chief Executive Officer	Option exercise M	+5,426	141.79	59,672	Form 4
2026-05-14	Barthelemy NicolasDirector	Grant or award A	+995	–	5,436	Form 4
2026-05-14	Dawes Karen ADirector	Grant or award A	+995	–	92,816	Form 4
2026-05-14	Pax MargaretDirector	Grant or award A	+995	–	3,011	Form 4
2026-05-14	Mhatre RohinDirector	Grant or award A	+995	–	5,014	Form 4
2026-05-14	Muir Glenn PDirector	Grant or award A	+995	–	40,051	Form 4
2026-05-14	Eglinton Manner CarrieDirector	Grant or award A	+995	–	5,461	Form 4
2026-05-14	Madaus Martin DDirector	Grant or award A	+995	–	6,581	Form 4
2026-05-14	Konstantinov KonstantinDirector	Grant or award A	+995	–	3,889	Form 4
2026-05-07	Douglass Brian RobbCHIEF PRODUCT OFFICER	Shares withheld for tax F	−334	126.43	7,985	Form 4
2026-05-07	Muir Glenn PDirector	Option exercise M	+2,434	38.76	39,056	Form 4
2026-03-05	Hughes ViolettaCHIEF ACCOUNTING OFFICER	Grant or award A	+2,466	–	6,608	Form 4
2026-03-05	Garland Jason KCFO	Grant or award A	+7,751	–	20,092	Form 4
2026-03-05	Bylund JamesChief Operating Officer	Grant or award A	+7,751	–	25,423	Form 4
2026-03-05	Loeillot OlivierChief Executive Officer	Grant or award A	+24,134	–	58,078	Form 4
2026-03-05	Kuriyel RalfSenior VP, R&D	Grant or award A	+5,284	–	20,062	Form 4
2026-03-04	Kuriyel RalfSenior VP, R&D	Grant or award A	+125	–	14,820	Form 4
2026-03-04	Kuriyel RalfSenior VP, R&D	Shares withheld for tax F	−42	125.84	14,778	Form 4
2026-03-04	Bylund JamesChief Operating Officer	Grant or award A	+125	–	17,734	Form 4
2026-03-04	Bylund JamesChief Operating Officer	Shares withheld for tax F	−62	125.84	17,672	Form 4
2026-03-02	Douglass Brian RobbCHIEF PRODUCT OFFICER	Shares withheld for tax F	−221	124.97	8,319	Form 4
2026-03-02	Kuriyel RalfSenior VP, R&D	Shares withheld for tax F	−923	124.97	14,695	Form 4
2026-03-02	Garland Jason KCFO	Shares withheld for tax F	−715	124.97	12,341	Form 4
2026-03-02	Hunt AnthonyDirector	Shares withheld for tax F	−9,897	124.97	89,062	Form 4
2026-03-02	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−1,610	124.97	33,944	Form 4
2026-03-02	Bylund JamesChief Operating Officer	Shares withheld for tax F	−2,433	124.97	17,609	Form 4
2026-02-27	Kuriyel RalfSenior VP, R&D	Shares withheld for tax F	−444	128.73	15,618	Form 4
2026-02-27	Garland Jason KCFO	Shares withheld for tax F	−327	128.73	13,056	Form 4
2026-02-27	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−344	128.73	35,554	Form 4
2026-02-27	Bylund JamesChief Operating Officer	Shares withheld for tax F	−1,478	128.73	20,042	Form 4
2025-12-31	Douglass Brian RobbCHIEF PRODUCT OFFICER	Grant or award A	+2,288	–	8,540	Form 4
2025-12-16	Muir Glenn PDirector	Option exercise M	+3,366	26.12	36,622	Form 4
2025-12-04	Hunt AnthonyDirector	Other J	−2,000	–	98,959	Form 4
2025-11-13	Hunt AnthonyDirector	Option exercise M	+2,952	33.87	83,695	Form 4
2025-11-12	Hunt AnthonyDirector	Option exercise M	+25,000	33.87	125,743	Form 4
2025-10-02	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−1,248	145.23	42,939	Form 4
2025-09-25	Garland Jason KCFO	Shares withheld for tax F	−412	121.68	13,383	Form 4
2025-09-10	Hunt AnthonyDirector	Option exercise M	+20,000	33.87	129,854	Form 4
2025-09-03	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−2,506	116.18	44,187	Form 4
2025-09-02	Hughes ViolettaCHIEF ACCOUNTING OFFICER	Grant or award A	+4,142	–	4,142	Form 4
2025-05-15	Barthelemy NicolasDirector	Grant or award A	+973	–	4,441	Form 4
2025-05-15	Mhatre RohinDirector	Grant or award A	+973	–	4,019	Form 4
2025-05-15	Pax MargaretDirector	Grant or award A	+973	–	2,016	Form 4
2025-05-15	Madaus Martin DDirector	Grant or award A	+973	–	5,586	Form 4
2025-05-15	Dawes Karen ADirector	Grant or award A	+973	–	92,096	Form 4
2025-05-15	Eglinton Manner CarrieDirector	Grant or award A	+973	–	4,466	Form 4
2025-05-15	Muir Glenn PDirector	Grant or award A	+973	–	33,256	Form 4
2025-05-15	Konstantinov KonstantinDirector	Grant or award A	+973	–	2,894	Form 4
2025-04-01	Bylund JamesChief Operating Officer	Shares withheld for tax F	−454	128.50	23,711	Form 4
2025-03-17	Hunt AnthonyDirector	Option exercise M	+5,000	33.87	141,301	Form 4
2025-03-17	Hunt AnthonyDirector	Option exercise M	+21,756	59.52	163,057	Form 4
2025-03-13	Bylund JamesChief Operating Officer	Grant or award A	+381	–	24,340	Form 4
2025-03-13	Bylund JamesChief Operating Officer	Shares withheld for tax F	−175	142.44	24,165	Form 4
2025-03-03	Loeillot OlivierDirector, Chief Executive Officer	Grant or award A	+14,480	–	46,693	Form 4
2025-03-03	Bylund JamesChief Operating Officer	Grant or award A	+6,435	–	25,198	Form 4
2025-03-03	Bylund JamesChief Operating Officer	Shares withheld for tax F	−1,239	155.38	23,959	Form 4
2025-03-03	Hunt AnthonyDirector	Shares withheld for tax F	−10,142	155.38	136,301	Form 4
2025-03-03	Kuriyel RalfSenior VP, R&D	Grant or award A	+4,826	–	16,448	Form 4
2025-03-03	Kuriyel RalfSenior VP, R&D	Shares withheld for tax F	−386	155.38	16,062	Form 4
2025-03-03	Garland Jason KCFO	Grant or award A	+6,435	–	13,795	Form 4
2025-02-27	Hunt AnthonyDirector	Shares withheld for tax F	−2,825	156.54	146,443	Form 4
2025-02-27	Kuriyel RalfSenior VP, R&D	Shares withheld for tax F	−391	156.54	11,622	Form 4
2025-02-27	Bylund JamesChief Operating Officer	Shares withheld for tax F	−1,285	156.54	18,763	Form 4
2025-02-27	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−343	156.54	32,213	Form 4
2025-02-27	Garland Jason KCFO	Shares withheld for tax F	−316	156.54	7,360	Form 4
2025-02-24	Hunt AnthonyDirector	Shares withheld for tax F	−2,380	164.74	149,268	Form 4
2025-02-24	Bylund JamesChief Operating Officer	Shares withheld for tax F	−543	164.74	20,048	Form 4
2025-02-24	Kuriyel RalfSenior VP, R&D	Shares withheld for tax F	−275	164.74	12,013	Form 4
2024-12-05	Hunt AnthonyDirector	Option exercise M	+11,808	33.87	151,648	Form 4
2024-11-21	Hunt AnthonyDirector	Option exercise M	+24,246	33.87	164,086	Form 4
2024-11-20	Loeillot OlivierDirector, Chief Executive Officer	Shares withheld for tax F	−861	123.41	32,556	Form 4
2024-11-20	Garland Jason KCFO	Shares withheld for tax F	−367	123.41	7,676	Form 4
2024-11-19	Muir Glenn PDirector	Option exercise M	+19,000	36.29	32,283	Form 4

How to read it

Buy, sale: Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan: A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after: The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value: Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

Repligen's scores and multiples ›