Halozyme Therapeutics Inc
Ownership
Ownership Structure
Who owns Halozyme Therapeutics Inc (HALO)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.8% of the shares are freely tradable; institutional investors hold 107.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 11.69 | 13,265,053 | +0.8 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.64 | 5,271,218 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.62 | 5,249,206 | +0.0 | 03/31/2026 |
| State Street Corp | 4.35 | 4,937,854 | -3.6 | 03/31/2026 |
| Amvescap Plc. | 3.54 | 4,012,494 | +10.0 | 03/31/2026 |
| Bank of America Corp | 2.57 | 2,913,109 | +6.6 | 03/31/2026 |
| Boston Partners Global Investors, Inc | 2.44 | 2,773,568 | +3.3 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.66 | 4,153,889 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.33 | 3,774,885 | +0.3 | 07/31/2026 |
| Vanguard Small Cap Index | 2.40 | 2,725,699 | +0.2 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Torley Helen | PRESIDENT AND CEO | 767,780 | 84,225,466 $ | Sep 11, 2026 | direct |
| Connaughton Bernadette | Director | 40,418 | 4,433,855 $ | Aug 10, 2026 | direct |
| Appelhans Dannielle | Director | 1,161 | 127,362 $ | Sep 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 11, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 4,508 | 107.55 | 484,826 |
| Sep 11, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 15,492 | 107.15 | 1,660,030 |
| Sep 11, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 20,000 | 18.41 | 368,200 |
| Sep 10, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 5,412 | 107.58 | 582,228 |
| Sep 10, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 14,588 | 107.01 | 1,561,091 |
| Sep 10, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 20,000 | 18.41 | 368,200 |
| Sep 9, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 100 | 108.67 | 10,867 |
| Sep 9, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 6,596 | 107.82 | 711,187 |
| Sep 9, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 13,304 | 107.22 | 1,426,481 |
| Sep 9, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 20,000 | 18.41 | 368,200 |
| Sep 1, 2026 | Appelhans Dannielle | Director | Other | 1,161 | 0.00 | – |
| Aug 19, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 3,200 | 107.77 | 344,848 |
| Aug 19, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 9,600 | 107.22 | 1,029,350 |
| Aug 19, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 7,200 | 106.36 | 765,778 |
| Aug 19, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 20,000 | 18.41 | 368,200 |
| Aug 18, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 9,400 | 104.87 | 985,816 |
| Aug 18, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 4,897 | 104.11 | 509,827 |
| Aug 18, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 5,703 | 103.08 | 587,882 |
| Aug 18, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 20,000 | 18.41 | 368,200 |
| Aug 17, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 7,500 | 103.48 | 776,115 |
| Aug 17, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 9,000 | 102.55 | 922,977 |
| Aug 17, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 2,100 | 101.77 | 213,709 |
| Aug 17, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 500 | 100.46 | 50,229 |
| Aug 17, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 900 | 98.96 | 89,062 |
| Aug 17, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 20,000 | 18.41 | 368,200 |
| Aug 10, 2026 | Connaughton Bernadette | Director | Sell | 1,626 | 102.80 | 167,153 |
| Jul 8, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 1,035 | 80.19 | 82,994 |
| Jul 8, 2026 | Torley Helen | PRESIDENT AND CEO | Sell | 888 | 79.28 | 70,397 |
| Jul 8, 2026 | Torley Helen | PRESIDENT AND CEO | Other | 1,923 | 12.07 | 23,211 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.