HALO · Stock research · Settlement-based research
Halozyme Therapeutics Inc
Latest saved settlement: Sep 30, 2026. Data updated Oct 13, 2026. Source: FINRA via Polygon.
Changes are versus the prior saved settlement shown with each comparison. Short interest measures open short positions at a settlement date, not daily short-sale volume. Missing values are not reported; zero is a valid reported value.
| Settlement date | SI shares | SI % of shares outstanding | Days to cover | Change · shares | Change · percent | Prior settlement date |
|---|---|---|---|---|---|---|
| Sep 30, 2026 | 15,295,841 | 13.4767% | 4.54 days | +141,427 | +0.9332% | Sep 15, 2026 |
| Sep 15, 2026 | 15,154,414 | 13.3521% | 11.59 days | +273,707 | +1.8393% | Aug 31, 2026 |
| Aug 31, 2026 | 14,880,707 | 13.111% | 8.69 days | +243,780 | +1.6655% | Aug 14, 2026 |
| Aug 14, 2026 | 14,636,927 | 12.8962% | 5.01 days | +614,793 | +4.3844% | Jul 31, 2026 |
| Jul 31, 2026 | 14,022,134 | 12.3545% | 8.35 days | +726,173 | +5.4616% | Jul 15, 2026 |
| Jul 15, 2026 | 13,295,961 | 11.7147% | 7.27 days | +69,738 | +0.5273% | Jun 30, 2026 |
| Jun 30, 2026 | 13,226,223 | 11.6533% | 6.27 days | +277,934 | +2.1465% | Jun 15, 2026 |
| Jun 15, 2026 | 12,948,289 | 11.4084% | 7.84 days | -695,956 | -5.1007% | May 29, 2026 |
| May 29, 2026 | 13,644,245 | 12.0216% | 8.12 days | +254,358 | +1.8996% | May 15, 2026 |
| May 15, 2026 | 13,389,887 | 11.7975% | 6.72 days | -991,854 | -6.8966% | Apr 30, 2026 |
| Apr 30, 2026 | 14,381,741 | 12.6714% | 10.22 days | +123,896 | +0.869% | Apr 15, 2026 |
| Apr 15, 2026 | 14,257,845 | 12.5622% | 10.57 days | +211,495 | +1.5057% | Mar 31, 2026 |
| Mar 31, 2026 | 14,046,350 | 12.3759% | 9.41 days | +345,335 | +2.5205% | Mar 13, 2026 |
| Mar 13, 2026 | 13,701,015 | 12.0716% | 8.4 days | +202,671 | +1.5015% | Feb 27, 2026 |
| Feb 27, 2026 | 13,498,344 | 11.893% | 6.14 days | -297,226 | -2.1545% | Feb 13, 2026 |
| Feb 13, 2026 | 13,795,570 | 12.1549% | 6.46 days | +279,743 | +2.0697% | Jan 30, 2026 |
| Jan 30, 2026 | 13,515,827 | 11.9084% | 9.07 days | -77,676 | -0.5714% | Jan 15, 2026 |
| Jan 15, 2026 | 13,593,503 | 11.9769% | 6.1 days | -206,969 | -1.4997% | Dec 31, 2025 |
| Dec 31, 2025 | 13,800,472 | 12.1592% | 9.89 days | +1,299,614 | +10.3962% | Dec 15, 2025 |
| Dec 15, 2025 | 12,500,858 | 11.0142% | 4.44 days | +127,962 | +1.0342% | Nov 28, 2025 |
| Nov 28, 2025 | 12,372,896 | 10.9014% | 6.06 days | -106,515 | -0.8535% | Nov 14, 2025 |
| Nov 14, 2025 | 12,479,411 | 10.9953% | 3.91 days | +1,174,270 | +10.387% | Oct 31, 2025 |
| Oct 31, 2025 | 11,305,141 | 9.9607% | 7.65 days | -204,969 | -1.7808% | Oct 15, 2025 |
| Oct 15, 2025 | 11,510,110 | 10.1412% | 4.8 days | — | — | — |
SI % uses shares outstanding available at enrichment time, not historical shares-outstanding counts. It is not a percentage of float. Missing percentages remain not reported; no shares-outstanding lookup is performed on page render.
Settlement dates are not publication dates. Saved coverage is not exhaustive history. Short interest and days to cover do not establish intent or predict returns.
At settlement Sep 30, 2026, HALO had 15,295,841 shares of reported short interest. SI % of shares outstanding is 13.4767%, using shares outstanding available at enrichment time, not historical outstanding counts or float. Compared with settlement Sep 15, 2026, the change was +141,427 shares and +0.9332%. Source: FINRA via Polygon; data updated Oct 13, 2026.
At settlement Sep 30, 2026, HALO's days to cover was 4.54 days. Days to cover compares short-interest shares with average daily trading volume. It is a reported ratio, not a prediction of how long positions will remain open. Source: FINRA via Polygon; data updated Oct 13, 2026.
FINRA short interest follows a bi-monthly settlement cycle, meaning twice per month rather than daily. Reports are published after the settlement date, and this page updates after the reported data is collected and processed. Weekends, holidays, and publication or provider delays can affect availability. A specific next update date is not promised.