56% buyers of institutions opening or closing positions this quarter
22 more new buyers than exits, ownership fell 7.39 percentage points vs the prior quarter, and 1 well-known fund manager in the top 25.
56% buyers of institutions opening or closing positions this quarter
90.2% institutional ownership
SNYDER CAPITAL MANAGEMENT portfolio allocation
Institutional ownership vs Biotechnology peers
No Form 4 insider transactions on file
Latest positioning in HALO across 13F flow, ownership shift, marquee holders, and holder-count growth.
Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in HALO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 13.3M | $857.3M | +0.9% | 11.184% | 0.01% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 5.3M | $340.7M | — | 4.444% | 0.01% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 5.2M | $339.3M | — | 4.426% | 0.02% |
| 4 | STATE STREET CORP | 4.9M | $319.1M | -3.6% | 4.163% | 0.01% |
| 5 | Invesco Ltd. | 4.0M | $259.3M | +10.0% | 3.383% | 0.04% |
| 6 | BANK OF AMERICA CORP /DE/ | 2.9M | $188.3M | +6.6% | 2.456% | 0.01% |
| 7 | Boston Partners | 2.7M | $173.4M | +451.0% | 2.263% | 0.18% |
| 8 | MORGAN STANLEY | 2.6M | $165.6M | -3.6% | 2.160% | 0.01% |
| 9 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 2.5M | $163.3M | +37.1% | 2.130% | 0.54% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 2.5M | $162.0M | +3.0% | 2.113% | 0.01% |
| 11 | SNYDER CAPITAL MANAGEMENT L P | 2.3M | $150.1M | -3.2% | 1.959% | 2.91% |
| 12 | DIMENSIONAL FUND ADVISORS LP | 2.1M | $134.4M | -1.2% | 1.753% | 0.03% |
| 13 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.9M | $124.0M | -40.5% | 1.617% | 0.07% |
| 14 | D. E. Shaw & Co., Inc. | 1.9M | $122.8M | +15.2% | 1.601% | 0.07% |
| 15 | ALLIANCEBERNSTEIN L.P. | 1.7M | $116.9M | -5.4% | 1.464% | 0.04% |
| 16 | ROYAL LONDON ASSET MANAGEMENT LTD | 1.6M | $104.1M | +17.4% | 1.358% | 0.22% |
| 17 | JUPITER ASSET MANAGEMENT LTD | 1.6M | $103.9M | +2.5% | 1.356% | 0.55% |
| 18 | TWO SIGMA INVESTMENTS, LP | 1.6M | $102.4M | +120.9% | 1.336% | 0.08% |
| 19 | WELLS FARGO & COMPANY/MN | 1.5M | $99.3M | +9.3% | 1.295% | 0.02% |
| 20 | FIRST TRUST ADVISORS LP | 1.5M | $95.8M | +46.5% | 1.250% | 0.07% |
| 21 | FULLER & THALER ASSET MANAGEMENT, INC. | 1.5M | $94.7M | +6.2% | 1.235% | 0.32% |
| 22 | MIZUHO MARKETS AMERICAS LLC | 1.3M | $85.5M | +4.3% | 1.116% | 2.34% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.3M | $83.3M | +3.8% | 1.087% | 0.01% |
| 24 | CONGRESS ASSET MANAGEMENT CO /MA | 1.3M | $82.8M | -1.7% | 1.080% | 0.59% |
| 25 | JANUS HENDERSON GROUP PLC | 1.2M | $79.7M | +42.8% | 1.040% | 0.04% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in HALO — a direct measure of their conviction.
Filings activity in HALO during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new HALO position in Q1 2026
Institutions that fully closed their HALO position in Q1 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 618 | +3.7% | 90.17% | 7.39 pp | $7.35B | 7.6% |
| Q4 2025 | 596 | +1.9% | 97.56% | 5.80 pp | $7.95B | 5.6% |
| Q3 2025 | 585 | +8.5% | 103.36% | +33.03 pp | $8.42B | +47% |
| Q2 2025 | 539 | +1.5% | 70.33% | 19.16 pp | $5.73B | 21% |
| Q1 2025 | 531 | +6.8% | 89.49% | +22.06 pp | $7.29B | +33% |
| Q4 2024 | 497 | +0.0% | 67.43% | 132.56 pp | $5.50B | 85% |
| Q3 2024 | 497 | +11% | 199.99% | +127.07 pp | $35.57B | +498% |
| Q2 2024 | 447 | — | 72.92% | — | $5.94B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
No recent Form 4 insider transactions on file for HALO.
Quick answers to the most common questions about buying HALO stock.
Based on Q1 2026 13F filings, institutional ownership of Halozyme Therapeutics, Inc. stands at 90.2%, held across 618 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of HALO, with approximately 13,265,053 shares worth $0.86B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of HALO, including TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for HALO is 39 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
103 institutions opened new positions in HALO during Q1 2026, while 81 fully exited. 159 added to existing positions and 354 trimmed.
HALO institutional ownership fell by 7.39 percentage points quarter-over-quarter, with a net change of — holders.
The top 10 institutions account for 40.4% of all reported 13F value in HALO, and the top 25 account for 61.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.