Who owns Heartflow, Inc. Common Stock (HTFL)

How tracked funds are positioned

136 tracked funds added shares of HTFL or opened a position while 57 sold shares or exited between 2026-Q1 and 2026-Q2 — the funds were divided. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.

Adds and trims are measured by share count, adjusted for stock splits; the dollar figure beside a change is the value of the shares added or sold at the newer filing's price, shown for context only. 11 funds had no complete filing on file for 2026-Q1 or 2026-Q2: no 13F stored, a filing under a fifth the size of the quarter beside it (usually an amendment stored on its own, sometimes a fund that sold most of its holdings), or a first 13F, as when a book moves to a new CIK. They are left out of the new buyers, exits and changes.

A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.

Conviction spread

HTFL’s largest tracked holder by dollar value, Bain Capital Life Sciences Investors, LLC, sizes it at 14.7% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 14.7pp conviction gap — its largest holder concentrates the name more heavily than the typical one.

Book-share is each fund’s reported value in HTFL divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.

Institutional & insider positioning

Between 2026-Q1 and 2026-Q2, across 186 tracked filers holding HTFL, 136 increased or opened the position and 57 reduced or closed it, by share count adjusted for splits; over the same quarter, open-market insider Form 4s were net sales.

This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.

Ownership over time

Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.