HTFL in the 13F filings

Heartflow Inc · CUSIP 42238D107

Sector · Medical devices and instruments Theme · Healthcare: biopharma and medtech· L3VLUP-defined Theme · Surgical, medical and electromedical devices

Quarter

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Quarter end: 31 Mar 2026; the date the book describes
Filed: 18 May 2026; latest of these filings; the earliest 8 May 2026
Managers listing it: 23; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q4 2025 and Q1 2026; 3 listed it in both
Shares listed: 27,585,299; combined, among listed positions
Reported value: $677m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 20 buyers (opened or added shares) and 4 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +9,324,832.

Managers listing HTFL in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

23 of 23 holders

				Action		Filing
Wellington Management Group LLP	11,982,283	$292m	0.05%	Added	+6,088,213	15 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	5,397,802	$131m	under 0.1%	Added	+1,274,949	15 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	2,180,976	$53m	under 0.1%	Added	+1,315,416	18 May 2026 (the filing on sec.gov)
Invesco Ltd	1,913,090	$47m	under 0.1%	Added	+1,335,693	12 May 2026 (the filing on sec.gov)
AllianceBernstein LP	1,224,326	$36m	under 0.1%	Added	+135,296	15 May 2026 (the filing on sec.gov)
Millennium Management LLC	1,093,417	$27m	under 0.1%	Added	+1,025,648	15 May 2026 (the filing on sec.gov)
Baillie Gifford & Co	1,084,652	$26m	under 0.1%	Trimmed	-1,921,346	8 May 2026 (the filing on sec.gov)
Citadel Advisors LLC	756,605	$18m	under 0.1%	Trimmed	-492,293	15 May 2026 (the filing on sec.gov)
Point72 Asset Management LP	538,351	$13m	under 0.1%	Added	+233,864	15 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP	362,094	$8.8m	0.06%	Added	+212,094	15 May 2026 (the filing on sec.gov)
AQR Capital Management LLC	208,814	$5.1m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	176,045	$4.3m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	148,200	$3.6m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Quantbot Technologies LP	120,847	$2.9m	0.12%	New	new	13 May 2026 (the filing on sec.gov)
Jane Street Group LLC	102,284	$2.5m	under 0.1%	New	new	12 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP	80,416	$2.0m	under 0.1%	Added	+27,795	15 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC	50,611	$1.2m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Holocene Advisors LP	44,578	$1.1m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP	34,605	$842k	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	31,975	$779k	under 0.1%	Trimmed	-831,296	15 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP	22,370	$544k	under 0.1%	New	new	13 May 2026 (the filing on sec.gov)
Walleye Capital LLC	19,464	$474k	under 0.1%	New	new	13 May 2026 (the filing on sec.gov)
Verition Fund Management LLC	11,494	$280k	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Wellington Management Group LLPexisting position · 11,982,283 shares now+6,088,213
Invesco Ltdexisting position · 1,913,090 shares now+1,335,693
Janus Henderson Group Ltdexisting position · 2,180,976 shares now+1,315,416
Fidelity (FMR LLC)existing position · 5,397,802 shares now+1,274,949
Millennium Management LLCexisting position · 1,093,417 shares now+1,025,648

Reductions

Baillie Gifford & Coexisting position · 1,084,652 shares now-1,921,346
T. Rowe Price Associates Incexisting position · 31,975 shares now-831,296
Citadel Advisors LLCexisting position · 756,605 shares now-492,293

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (11)

AQR Capital Management LLC$5.1m
Voloridge Investment Management LLC$4.3m
Balyasny Asset Management LLC$3.6m
Quantbot Technologies LP$2.9m
Jane Street Group LLC$2.5m
Squarepoint Ops LLC$1.2m
Holocene Advisors LP$1.1m
Susquehanna International Group LLP$842k
Hudson Bay Capital Management LP$544k
Walleye Capital LLC$474k

Exited (1)

D. E. Shaw & Co.was $540k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

6 in Q3 2025 to 4 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

HTFL and LLY →HTFL and JNJ →HTFL and VRTX →Choose a stock to compare with HTFL →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own HTFL, latest filings →Back to the 13F Explorer →

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Quarter	Holders	Reported value	Buyers	Sellers
Q3 2025	6	$320m	6	0
Q4 2025	3	$264m	7	11
Q1 2026	5	$383m	20	4
Q2 2026	4	$356m	15	13