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RGEN

REPLIGEN (RGEN) stock: insider trades, news & valuation

Heavy selling
Close · Oct 9, 2026 $173.88 +6.1% on the day +16.8% over 12 months 52-week range $102.87 – $194.57

Share price and insider trades

RGEN closeInsider buyInsider sale
100150200NovDecJan 2026FebMarAprMayJunJulAugSepOctSold $44,275 on 2025-12-17 · Karen A DawesSold $79,500 on 2026-07-16 · Jason K GarlandSold $106,285 on 2026-06-25 · Jason K GarlandSold $331,301 on 2025-11-18 · James BylundSold $503,506 on 2026-09-04 · Olivier LoeillotSold $536,480 on 2026-04-21 · Olivier LoeillotSold $976,680 on 2026-09-21 · Olivier LoeillotSold $976,680 on 2026-08-20 · Olivier LoeillotSold $1,036,654 on 2026-10-05 · Olivier LoeillotSold $1,196,970 on 2025-11-25 · Olivier LoeillotSold $2,459,740 on 2026-09-24 · Olivier LoeillotSold $3,092,278 on 2025-11-13 · Anthony HuntSold $3,921,940 on 2025-11-12 · Anthony Hunt
Bought, 12 months$0
Sold, 12 months$15.3M
Insiders buying0
Insiders selling5

REPLIGEN insider trading at a glance (Oct 9, 2026): in the past 12 months, 0 insiders bought $0 and 5 sold $15.3M of RGEN stock on the open market.

RGEN insider buying and selling by quarter

Open-market purchases (green, above the line) and sales (red, below), by trade date.

Q4 2025: $8.6M sold (15 trades)Q4 2025Q1 2026Q2 2026: $643K sold (2 trades)Q2 2026Q3 2026: $5.0M sold (6 trades)Q3 2026Q4 2026: $1.0M sold (2 trades)Q4 2026
QuarterBoughtPurchasesSoldSales
Q4 2026—0$1.0M2
Q3 2026—0$5.0M6
Q2 2026—0$643K2
Q1 2026—0—0
Q4 2025—0$8.6M15

Valuation, profit and volume

P/E (trailing)n/aSector median —
Market value— 
Profit margin—Revenue growth —
Volume vs. 50-day1.5×Last 5 sessions
Insiders' paper profit—On all tracked purchases —

Summary

Over the past 12 months, 0 REPLIGEN CORP insiders reported open-market purchases totaling $0, while 5 insiders reported sales totaling $15.3M. 16 of 25 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.

Insider transactions

Open-market purchases and sales.

Filed Insider Type Shares Price Value Since Score
Oct 6SEC Olivier LoeillotCEO Sell Plan 4,20245,788 held (−8%) $190.00 $798K -8.5% —
Oct 6SEC Olivier LoeillotCEO Sell Plan 1,33345,788 held (−3%) $178.75 $238K -2.7% —
Sep 25SEC Olivier LoeillotCEO Sell Plan 8,40448,369 held (−15%) $190.00 $1.6M -8.5% —
Sep 25SEC Olivier LoeillotCEO Sell Plan 4,54248,369 held (−9%) $190.00 $863K -8.5% —
Sep 22SEC Olivier LoeillotCEO Sell Plan 5,42648,369 held (−10%) $180.00 $977K -3.4% —
Sep 8SEC Olivier LoeillotCEO Sell Plan 3,03548,369 held (−6%) $165.90 $504K +4.8% —
Aug 21SEC Olivier LoeillotCEO Sell Plan 5,42654,246 held (−9%) $180.00 $977K -3.4% —
Jul 17SEC Jason K GarlandCFO Sell Plan 53018,829 held (−3%) $150.00 $80K +15.9% —
Jun 26SEC Jason K GarlandCFO Sell Plan 73319,359 held (−4%) $145.00 $106K +19.9% —
Apr 22SEC Olivier LoeillotCEO Sell Plan 3,83254,246 held (−7%) $140.00 $536K +24.2% —
Dec 18SEC Karen A DawesDirector Sell 27591,821 held (−0%) $161.00 $44K +8.0% —
Nov 26SEC Olivier LoeillotCEO Sell Plan 7,04135,898 held (−16%) $170.00 $1.2M +2.3% —
Nov 19SEC James BylundCOO Sell 2,19121,520 held (−9%) $151.21 $331K +15.0% —
Nov 14SEC Anthony HuntDirector Sell 5,73782,699 held (−6%) $156.22 $896K +11.3% —
Nov 14SEC Anthony HuntDirector Sell 3,00088,436 held (−3%) $155.45 $466K +11.9% —
Nov 14SEC Anthony HuntDirector Sell 2,92393,936 held (−3%) $153.14 $448K +13.5% —
Nov 14SEC Anthony HuntDirector Sell 2,50091,436 held (−3%) $154.32 $386K +12.7% —
Nov 14SEC Anthony HuntDirector Sell 2,10096,859 held (−2%) $152.17 $320K +14.3% —
Nov 14SEC Anthony HuntDirector Sell 1,95680,743 held (−2%) $157.11 $307K +10.7% —
Nov 14SEC Anthony HuntDirector Sell 1,78498,959 held (−2%) $151.01 $269K +15.1% —
Nov 13SEC Anthony HuntDirector Sell Plan 11,096101,207 held (−10%) $158.01 $1.8M +10.0% —
Nov 13SEC Anthony HuntDirector Sell Plan 4,959112,303 held (−4%) $156.65 $777K +11.0% —
Nov 13SEC Anthony HuntDirector Sell Plan 4,740117,262 held (−4%) $155.85 $739K +11.6% —
Nov 13SEC Anthony HuntDirector Sell Plan 3,741122,002 held (−3%) $154.92 $580K +12.2% —
Nov 13SEC Anthony HuntDirector Sell Plan 464100,743 held (−0%) $158.51 $74K +9.7% —

Insiders at REPLIGEN CORP

InsiderBoughtSoldLast filingScore
Olivier LoeillotCEO — $7.7M Oct 6, 2026 —
Anthony HuntDirector — $7.0M Nov 14, 2025 —
James BylundCOO — $331K Nov 19, 2025 —
Jason K GarlandCFO — $186K Jul 17, 2026 —
Karen A DawesDirector — $44K Dec 18, 2025 —

RGEN stock: common questions

Are REPLIGEN CORP insiders buying RGEN stock?

In the past 12 months, 0 insiders reported open-market purchases of RGEN worth $0.

Are REPLIGEN CORP insiders selling RGEN stock?

5 insiders reported sales worth $15.3M over the same period.

Where does this data come from?

Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.

What is RGEN's 52-week range?

Over the past year RGEN has traded between $102.87 and $194.57. It last closed at $173.88 on Oct 9, 2026.