Heartflow, Inc. HTFL
CIK 0001464521 · CUSIP 42238D107
Quarter-end disclosures, not live holdings.
Top 20 institutions
Weight means this stock's share of the manager's own portfolio.
| # | Manager | Value | Manager weight | Change vs prior | Source | |
|---|---|---|---|---|---|---|
| 01 | WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history | $291.53M 11,982,283 shares | 0.05% | +6.09M(+103.30%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 02 | Bain Capital Life Sciences Investors, LLC CIK 1703031 · View history | $254.20M 10,448,158 shares | 22.93% | -2.00M(-16.10%)Reduced | SEC filing ↗ May 15, 2026 | ▾ |
| 03 | FMR LLC CIK 315066 · View history | $131.33M 5,397,802 shares | 0.01% | +1.27M(+30.90%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 04 | BAMCO INC /NY/ CIK 1017918 · View history | $93.12M 3,827,531 shares | 0.28% | +1.52M(+66.10%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 05 | JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history | $53.06M 2,180,976 shares | 0.03% | +1.32M(+152.00%)Added | SEC filing ↗ May 18, 2026 | ▾ |
| 06 | VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history | $49.78M 2,045,938 shares | 0.00% | — | SEC filing ↗ May 8, 2026 | ▾ |
| 07 | Invesco Ltd. CIK 914208 · Amended · View history | $46.55M 1,913,090 shares | 0.00% | +1.34M(+231.30%)Added | SEC filing ↗ May 12, 2026 | ▾ |
| 08 | VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history | $46.07M 1,893,495 shares | 0.00% | — | SEC filing ↗ May 15, 2026 | ▾ |
| 09 | ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history | $35.69M 1,224,326 shares | 0.01% | +135.30K(+12.40%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 10 | BlackRock, Inc. CIK 2012383 · View history | $35.58M 1,462,584 shares | 0.00% | +120.44K(+9.00%)Added | SEC filing ↗ May 13, 2026 | ▾ |
| 11 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC CIK 861177 · View history | $34.42M 1,414,828 shares | 0.01% | -16.18K(-1.10%)Reduced | SEC filing ↗ May 13, 2026 | ▾ |
| 12 | MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history | $26.60M 1,093,417 shares | 0.02% | +1.03M(+1,513.40%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 13 | BAILLIE GIFFORD & CO CIK 1088875 · View history | $26.39M 1,084,652 shares | 0.03% | -1.92M(-63.90%)Reduced | SEC filing ↗ May 8, 2026 | ▾ |
| 14 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC CIK 1638555 · View history | $21.70M 892,093 shares | 1.00% | -367.03K(-29.10%)Reduced | SEC filing ↗ May 15, 2026 | ▾ |
| 15 | MORGAN STANLEY CIK 895421 · View history | $20.73M 851,932 shares | 0.00% | +106.01K(+14.20%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 16 | FRANKLIN RESOURCES INC CIK 38777 · View history | $19.31M 793,721 shares | 0.00% | +108.56K(+15.80%)Added | SEC filing ↗ May 13, 2026 | ▾ |
| 17 | EVENTIDE ASSET MANAGEMENT, LLC CIK 1442891 · View history | $18.42M 756,956 shares | 0.30% | +250.97K(+49.60%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 18 | CITADEL ADVISORS LLC CIK 1423053 · View history | $18.41M 756,605 shares | 0.01% | -492.29K(-39.40%)Reduced | SEC filing ↗ May 15, 2026 | ▾ |
| 19 | VOYA INVESTMENT MANAGEMENT LLC CIK 1068837 · View history | $17.70M 727,667 shares | 0.02% | +499.05K(+218.30%)Added | SEC filing ↗ May 12, 2026 | ▾ |
| 20 | Ensign Peak Advisors, Inc CIK 1454984 · Amended · View history | $16.80M 690,466 shares | 0.03% | -10.34K(-1.50%)Reduced | SEC filing ↗ May 13, 2026 | ▾ |
Showing 20 / 169 institutions. The complete set is available through the API.
Coverage & totals by quarter
Reporting institutions by quarter
Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.
Explore all 169 reporting institutions.
This page includes 20 of 169 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.
- Download CSV
- Earlier quarters
- Advanced screening & filtering
- API & AI access
+ New accounts get free API credits to explore data beyond ownership filings.
For AI agents & developers
The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 169 reporting institutions; totals use the complete disclosed data.
Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.
MCP https://api.akkrudata.ai/mcp
akkru_institutional_holdings
{"action":"holders","cusip":"42238D107","quarter":"2026Q1","type":"positions","page_size":100}Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.
- MCP endpoint
- https://api.akkrudata.ai/mcp
- API / MCP / CLI documentation
- /documents
- llms.txt
- /llms.txt
Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.