Fairmount Funds Management LLC bought $6.0M of ZBIO
director at Zenas BioPharma, Inc.. 316,219 shares at an average of $19.00, traded Oct 7, 2025, filed Oct 9, 2025.
Score components
- +15RoleDirector
- +25Trade size$6.0M at market
- +3Relative to holdingsHoldings up 17%
- +4Price context19% below the 52-week high
- +15Cluster5 insiders buying within 14 days
- 0Repeat buyingFirst buy in 90 days
- 0Track recordToo few past buys to judge (0 with prices)
What happened after comparable buys
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
This signal so far: 1m +21.1%, 3m -40.9%, 6m -23.3%.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001104659-25-098362, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Oct 7, 2025 | POpen-market purchase Common Stockindirect: By Fairmount Healthcare Fund II L.P. | +316,219 | $19.00 | $6.0M | 2,209,025 | Oct 9, 2025 |
Related signals
Other insiders at Zenas BioPharma, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 78Notable | ZBIObuy Zenas BioPharma, Inc. | Leon O Moulder Jr Chief Executive Officer | $1.0M 60,000 shares | +162% | |
| 63Notable | ZBIObuy Zenas BioPharma, Inc. | Leon O Moulder Jr Chief Executive Officer | $1.1M 60,000 shares | +3% | |
| 46Moderate | Zenas BioPharma, Inc. | Hongbo Lu director | $70k 3,768 shares | +1% | |
| 66Notable | Zenas BioPharma, Inc. | Fairmount Funds Management LLC director | $3.0M 150,000 shares | +7% | |
| 74Notable | Zenas BioPharma, Inc. | Hongbo Lu director | $1.5M 75,000 shares | +22% | |
| 78Notable | Zenas BioPharma, Inc. | Leon O Moulder Jr Chief Executive Officer | $1.0M 54,000 shares | +3% | |
| 64Notable | Zenas BioPharma, Inc. | Patricia L Allen director | $500k 19,860 shares | - | |
| 60Notable | Zenas BioPharma, Inc. | Hongbo Lu director | $585k 25,985 shares | +8% | |
| 81Strong | Zenas BioPharma, Inc. | Leon O Moulder Jr Chief Executive Officer | $1.0M 57,000 shares | +16% | |
| 64Notable | ZBIObuy Zenas BioPharma, Inc. | Leon O Moulder Jr Chief Executive Officer | $1.6M 100,000 shares | +38% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.