Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in HTFL held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | WELLINGTON MANAGEMENT GROUP LLP | 12.0M | $291.5M | +103.3% | 3.251% | 0.05% |
| 2 | Bain Capital Life Sciences Investors, LLC | 10.4M | $254.2M | -16.1% | 2.835% | 22.93% |
| 3 | FMR LLC | 5.4M | $131.3M | +30.9% | 1.465% | 0.01% |
| 4 | BAMCO INC /NY/ | 3.8M | $93.1M | +66.1% | 1.039% | 0.28% |
| 5 | JANUS HENDERSON GROUP PLC | 2.2M | $53.1M | +152.0% | 0.592% | 0.03% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.0M | $49.8M | — | 0.555% | 0.00% |
| 7 | Invesco Ltd. | 1.9M | $46.5M | +231.3% | 0.519% | 0.01% |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 1.9M | $46.1M | — | 0.514% | 0.00% |
| 9 | ALLIANCEBERNSTEIN L.P. | 1.2M | $35.7M | +12.4% | 0.332% | 0.01% |
| 10 | BlackRock, Inc. | 1.5M | $35.6M | +9.0% | 0.397% | 0.00% |
| 11 | UBS ASSET MANAGEMENT AMERICAS INC | 1.4M | $34.4M | -1.1% | 0.384% | 0.01% |
| 12 | MILLENNIUM MANAGEMENT LLC | 1.1M | $26.6M | +1513.4% | 0.297% | 0.02% |
| 13 | BAILLIE GIFFORD & CO | 1.1M | $26.4M | -63.9% | 0.294% | 0.03% |
| 14 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 892K | $21.7M | -29.1% | 0.242% | 1.15% |
| 15 | MORGAN STANLEY | 852K | $20.7M | +14.2% | 0.231% | 0.00% |
| 16 | FRANKLIN RESOURCES INC | 794K | $19.3M | +15.8% | 0.215% | 0.00% |
| 17 | CITADEL ADVISORS LLC | 769K | $18.7M | -38.5% | 0.209% | 0.01% |
| 18 | EVENTIDE ASSET MANAGEMENT, LLC | 757K | $18.4M | +49.6% | 0.205% | 0.30% |
| 19 | VOYA INVESTMENT MANAGEMENT LLC | 728K | $17.7M | +218.3% | 0.197% | 0.02% |
| 20 | Ensign Peak Advisors, Inc | 690K | $16.8M | -1.5% | 0.187% | 0.03% |
| 21 | NEXT CENTURY GROWTH INVESTORS LLC | 653K | $15.9M | — | 0.177% | 1.15% |
| 22 | 12 West Capital Management LP | 640K | $15.6M | — | 0.174% | 2.63% |
| 23 | FRED ALGER MANAGEMENT, LLC | 638K | $15.5M | +44.9% | 0.173% | 0.07% |
| 24 | Rock Springs Capital Management LP | 573K | $13.9M | +106.2% | 0.155% | 0.82% |
| 25 | Champlain Investment Partners, LLC | 567K | $13.8M | — | 0.154% | 0.18% |
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 HTFL — a direct measure of their conviction.
Filings activity in HTFL during Q1 2026, grouped by how each filer changed its position.
3 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 | 165 | +51% | 12.77% | +0.73 pp | $1.56B | +6.1% |
| Q4 2025 | 109 | +25% | 12.04% | +0.51 pp | $1.47B | +4.4% |
| Q3 2025 | 87 | — | 11.53% | — | $1.41B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying HTFL stock.
Based on Q1 2026 13F filings, institutional ownership of Heartflow, Inc. Common Stock stands at 12.8%, held across 165 reporting institutions.
WELLINGTON MANAGEMENT GROUP LLP is the largest reported institutional holder of HTFL, with approximately 11,982,283 shares worth $0.29B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of HTFL, including MILLENNIUM MANAGEMENT LLC, CITADEL ADVISORS LLC.
Our composite Smart Money Score for HTFL is 74 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
75 institutions opened new positions in HTFL during Q1 2026, while 19 fully exited. 36 added to existing positions and 54 trimmed.
HTFL institutional ownership rose by 0.73 percentage points quarter-over-quarter, with a net change of +56 holders.
The top 10 institutions account for 66.3% of all reported 13F value in HTFL, and the top 25 account for 85.2%.
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.
Heartflow, Inc. Common Stock (HTFL) Institutional Ownership