Fairmount Funds Management LLC: JADE BIOSCIENCES INC (JBIO): Quarterly 13F Position History
As of Q1 2026, Fairmount Funds Management LLC reported 4,553,494 shares of JADE BIOSCIENCES INC (JBIO), worth $64.0M and representing 4.6% of its 13F equity book. The position first appeared in Q2 2025 and has been disclosed across 4 13F-HR filings in Pactolio's tracked window.
- 4,553,494Shares Held (Latest Filing)
- $64.0MReported Market Value (Latest Filing)
- 4.6%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- -$6.3MQuarter-over-Quarter Value Change
- 4,553,494Peak 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 | 4,553,494 | 0 | — | $64.0M | 4.6% | $14.1 |
| Q4 2025 | 4,553,494 | +1,333,126 | +41.4% | $70.3M | 5.3% | $15.4 |
| Q3 2025 | 3,220,368 | 0 | — | $27.8M | 2.5% | $8.6 |
| Q2 2025 | 3,220,368 | — | — | $32.2M | 4.2% | $10.0 |
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 Fairmount Funds Management LLC first disclose a JBIO position in 13F-HR filings?
Fairmount Funds Management LLC first reported JADE BIOSCIENCES INC (JBIO) 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 Fairmount Funds Management LLC's most recent quarter-over-quarter share-count change in JBIO?
Fairmount Funds Management LLC held the same 4,553,494 shares of JBIO between Q4 2025 and Q1 2026 — the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent Fairmount Funds Management LLC's cost basis in JBIO?
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.