The move
As of Sep 24, Fastly (FSLY) last traded around $26.68, up 13.7% on the session and down 10.0% after hours, on $897.8M of dollar volume, running about 5.2× its normal volume.
Why it is on our radar
Our radar flagged FSLY for up 14%, heavy scanner alerts, high volume. It fired 27 of our alerts.
What the numbers show
Market cap is about $4.2B; short interest sits near 13% of float, about 4.4 days to cover.
The latest SEC filing
The most recent SEC filing on record is Insider trade (Form 4) (Sep 23, 2026).
How we built this
FSLY was surfaced by our trending engine, which ranks stocks by real-time move, dollar volume, alert activity, and community chatter. The fundamentals, float, short interest, and filings come straight from our due-diligence data, sourced from SEC EDGAR. Nothing here is a fabricated stat, and nothing here is a recommendation.
Why is FSLY moving?
Fastly is up on $897.8M of volume and ranks near the top of our trending board for up 14% and heavy scanner alerts. This reflects what our data shows as of Sep 24, not a forecast.
Is FSLY heavily shorted?
Short interest in FSLY is around 13% of its float, roughly 4.4 days to cover, as of the most recent data we have.
Is this investment advice?
No. This is information and education built from public data, not investment advice, and we are not licensed financial advisors.