A research filter, not a predictor — not financial advice. Grades rank growth stocks on evidence-based quality signals from end-of-day data; they are not buy/sell calls or price forecasts. Always do your own research.

Heartflow, Inc. Common Stock HTFL

Promising (early) broader-coverage candidate · HeartFlow, Inc. operates as a global medical technology firm, specializing in providing non-surgical solutions for the diagnosis and ongoing management of coronary artery disease.

On FrontierLab's discovery record since 2026-06-23 (15 weeks ago) — when this name first surfaced. (distinct from the snapshot date below)

Auto-graded broader coverage — sourced by an automated screen and graded on default bands, not the sector-calibrated bands the curated screener uses. A "Promising (early)" here is NOT the same bar as a curated grade; these are auto-screened candidates for your own research, shown as of their surface date (2026-09-10), not the curated Frontier signal.

⚠ Pump risk: parabolic/spike characteristics detected in the screen flags. Treat any positive grade with extra skepticism.

Key quality signals

Revenue growth (YoY)	42.8%
Gross margin	80.1%
Gross profits / assets	0.49
Rule of 40	8.5
Net margin	-34.3%
Cash runway (months)	37.3
PEG	—
Price / sales	19

Quality checklist

~ Revenue growth — 42.8% (pass ≥ 20%)
✓ Capital efficiency
✓ Gross margin — 80.1% (pass ≥ 60%)
✓ Gross-margin trend — 4.8 (pass ≥ 2)
✓ Share dilution — 7.2%

Fundamentals — snapshot as of 2026-09-10

Stage	Early
Share issuance (YoY)	7.2% · heavy issuance
Moat	—
TAM	—
P/E (trailing)	—
EPS (trailing)	$-1.42
Burn multiple	0.2
Gross-margin trend (pts)	4.8
Cash / assets	0.47
Net debt / EBITDA	—
Statements as of	Q2 FY2026 · filed 2026-08-13

Momentum context — a snapshot from 2026-09-10, not current

Price at surface	$46.67 (as of 2026-09-10)
52-week range	$20.13 – $51.778
% off 52-wk high	-9.9%
RSI (14)	63
Relative volume	0.6×

Risk flags

Burning cash — operating margin is negative.Heavy share dilution (>5%/yr) — your slice shrinks.Hyper-expansion — assets up ~116% in a year; aggressive expanders have historically lagged.IPO'd under 18 months ago and not yet self-funding at scale — young issuers like this have the worst base rates.Parabolic one-day spike (+36%) in the last month — extreme single-day moves tend to mean-revert.

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Data as of 2026-09-10 (end-of-day). How grades are computed →