Insider trade

CEO sold ~$977K of RGEN shares in the open market

Traded Sep 21, 2026 · Filed Sep 23, 2026

RepligenRGEN

~$977K
Reported value · 5,426 sh @ $180.00: 48K
Holds after · shares reported: +4.9%
stock since the trade · S&P 500 +0.2%, $180.71 → $189.50 on Oct 5

Why it stands out

The boss of Repligen sold $977K of Repligen shares. It was planned long ago, so it says very little.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Sep 21, 2026
Reporting period: Not applicable
Filed with the SEC: Sep 23, 2026

CEO$500K–$1MPre-arranged plan referenced

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$976,680

Shares × reported transaction price

Timing vs results

55 days after results of Jul 28, 2026

Results dates are the company's own 8-K (Item 2.02). Many companies only let insiders trade in a window after results

Price at the time

Closed at $180.71 on Sep 21, 2026, within 1% of its 52-week high, after a 10% rise over the previous 30 trading days

52-week range $102.87 (May 15, 2026) to $182.03 (Aug 27, 2026), 98% of the way up, from 241 adjusted closes. 30 trading days earlier: $163.90 on Aug 7, 2026. Describes the past only, not a forecast

Planned / mechanical clue

Footnote references a pre-arranged trading plan (Rule 10b5-1)

Only flagged when a footnote says so; never inferred

After it was reported

After	Stock	S&P 500	Difference
7 days	+4.2%	−0.7%	+4.8%

Past results only. Not a forecast.

Source receipt

Record ID: 0001628280-26-063026
Filed / recorded: Sep 23, 2026, 12:07 AM UTC
Added to OQRO: Oct 6, 2026, 8:46 PM UTC
Parser: form4-xml-v2
Data quality: Verified: identifiers matched exactly
Issuer: REPLIGEN CORP
Issuer CIK: 730272
Ticker: RGEN
Reporting person: Olivier Loeillot
Relationship: Director, Officer
Officer title: Chief Executive Officer
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Sep 21, 2026
Transaction code: S
Shares / units: 5,426
Price per share: $180.00
Acquired / disposed: Disposed (D)
Shares owned after: 48,369
Ownership form: Direct
Amendment: No

Footnotes from the filing

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

Around the same time

CEO sold ~$238K of Repligen

Scheduled in advanceyesterday

4,202Shares · @ $154.96

yesterday

Derivative exercise or conversion — not an open-market buy.

More Official record

CEO sold ~$798K of Repligen

Scheduled in advanceyesterday