Halozyme Therapeutics
HALO · NASDAQ
Who owns HALO
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 35.8% of HALO’s shares.
- BlackRock Institutional Trust Company, N.A.10.0%
- Vanguard Capital Management, LLC4.5%
- Vanguard Portfolio Management, LLC4.5%
- State Street Investment Management (US)4.4%
- Next 6 largest institutions12.5%
- All other shareholders64.2%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 11.86M | 10.00% |
| Vanguard Capital Management, LLC | 5.35M | 4.51% |
| Vanguard Portfolio Management, LLC | 5.30M | 4.47% |
| State Street Investment Management (US) | 5.18M | 4.37% |
| Boston Partners | 2.77M | 2.34% |
| Invesco Advisers, Inc. | 2.53M | 2.13% |
| Geode Capital Management, L.L.C. | 2.52M | 2.12% |
| William Blair Investment Management, LLC | 2.51M | 2.12% |
| Snyder Capital Management, L.P. | 2.40M | 2.02% |
| Dimensional Fund Advisors, L.P. | 2.09M | 1.76% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Mid-Cap ETF | 4.15M | 3.50% |
| Vanguard Total Stock Market Index Fund | 3.77M | 3.18% |
| Vanguard Small-Cap Index Fund | 2.73M | 2.30% |
| Vanguard Small-Cap Growth Index Fund | 1.58M | 1.33% |
| State Street SPDR S&P Biotech ETF | 1.49M | 1.25% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $29.40M (66 trades) of HALO on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Torley Helen | Option exercise | 20.00K | $368.20K |
| Torley Helen | Sale | 200 | $22.10K |
| Torley Helen | Sale | 11.90K | $1.31M |
| Torley Helen | Sale | 3.09K | $336.53K |
| Torley Helen | Sale | 4.81K | $520.34K |
| Torley Helen | Option exercise | 20.00K | $368.20K |
| Torley Helen | Option exercise | 20.00K | $368.20K |
| Torley Helen | Sale | 200 | $22.74K |
| Torley Helen | Sale | 900 | $101.50K |
| Torley Helen | Sale | 10.30K | $1.15M |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Gilbert CisnerosHouse | Sale | $1K–$15K | Sep 29, 2026 |
Short interest
Settled Sep 30, 2026
- Shares short
- 15.30M
- Days to cover
- 4.54
- % of shares outstanding
- 12.90%
- Average daily volume
- 3.37M
- Change since last report
- +0.9%
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