Octagon Capital Advisors LP: ABIVAX SA (ABVX): Quarterly 13F Position History
As of Q1 2026, Octagon Capital Advisors LP reported 677,000 shares of ABIVAX SA (ABVX), worth $75.4M and representing 8.3% of its 13F equity book. Quarter-over-quarter share count change: 79,000 (-10.4%) . The position first appeared in Q2 2025 and has been disclosed across 4 13F-HR filings in Pactolio's tracked window.
- 677,000Shares Held (Latest Filing)
- $75.4MReported Market Value (Latest Filing)
- 8.3%Portfolio Weight (% of 13F Equity Book)
- 79,000Quarter-over-Quarter Share Change
- -$26.6MQuarter-over-Quarter Value Change
- 1,325,000Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 4 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 677,000 | 79,000 | -10.4% | $75.4M | 8.3% | $111.3 |
| Q4 2025 | 756,000 | 569,000 | -42.9% | $102.0M | 12.8% | $134.9 |
| Q3 2025 | 1,325,000 | +58,000 | +4.6% | $112.5M | 17.6% | $84.9 |
| Q2 2025 | 1,267,000 | — | — | $9.7M | 2.1% | $7.7 |
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, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Octagon Capital Advisors LP first disclose a ABVX position in 13F-HR filings?
Octagon Capital Advisors LP first reported ABIVAX SA (ABVX) on its 13F-HR filing for the period ending 2025-06-30 (Q2 2025). The position has appeared on 4 reported quarters within Pactolio's tracked window.
What was Octagon Capital Advisors LP's most recent quarter-over-quarter share-count change in ABVX?
Between Q4 2025 and Q1 2026, Octagon Capital Advisors LP reduced its ABVX position by 79,000 shares (-10.4%), leaving 677,000 shares at a market value of $75.4M.
Does the implied price-per-share represent Octagon Capital Advisors LP's cost basis in ABVX?
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.