Avidity Partners Management LP: REPLIGEN CORP (RGEN): Quarterly 13F Position History
As of Q2 2026, Avidity Partners Management LP reported 77,800 shares of REPLIGEN CORP (RGEN), worth $10.6M and representing 1.7% of its 13F equity book. The position first appeared in Q2 2025 and has been disclosed across 5 13F-HR filings in Pactolio's tracked window.
- 77,800Shares Held (Latest Filing)
- $10.6MReported Market Value (Latest Filing)
- 1.7%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- +$1.4MQuarter-over-Quarter Value Change
- 106,500Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 5 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q2 2026 | 77,800 | 0 | – | $10.6M | 1.7% | $136.4 |
| Q1 2026 | 77,800 | +27,500 | +54.7% | $9.2M | 2.1% | $118.3 |
| Q4 2025 | 50,300 | +27,000 | +115.9% | $8.2M | 2.4% | $163.9 |
| Q3 2025 | 23,300 | 83,200 | -78.1% | $3.1M | 0.7% | $133.7 |
| Q2 2025 | 106,500 | – | – | $13.2M | 2.7% | $124.4 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares, a quarter-end mark rather than the manager's cost basis. See the full methodology document for the normalization rules.
When did Avidity Partners Management LP first disclose a RGEN position in 13F-HR filings?
Avidity Partners Management LP first reported REPLIGEN CORP (RGEN) on its 13F-HR filing for the period ending 2025-06-30 (Q2 2025). The position has appeared on 5 reported quarters within Pactolio's tracked window.
What was Avidity Partners Management LP's most recent quarter-over-quarter share-count change in RGEN?
Avidity Partners Management LP held the same 77,800 shares of RGEN between Q1 2026 and Q2 2026, so the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent Avidity Partners Management LP's cost basis in RGEN?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.