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Fastly FSLY

US equityMarket cap rank #2255
$26.01 +$0.20 (+0.77%)
Market closed · Oct 5, 11:50 pm ET · Last extended-hours $26.10 +0.35%
Open$25.45
Prev close$25.81
Day range$25.01 – $26.04
Volume2.55M
Market cap$4.14B
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership96.3%-0.15 pts vs. prior quarter
Institutions holding340+0 vs. prior quarter
Insider trades (recent)7 buys / 41 sellsNet selling
Short interest13.54% of floatDays to cover 4.0 · as of 15 Sep 2026
Short-sale volume share23.2%5-day average of daily volume

Short-sale volume as % of daily volume

10%16%21%27%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$5.19M (7 inflow days, 13 outflow days).

The five largest holders on file together own 33.2% of shares outstanding.

Largest holders

  • BlackRock9.56%
  • FMR7.46%
  • Vanguard Portfolio Management, LLC6.16%
  • Capital Research5.17%
  • First Trust Advisors L.P.4.82%
  • Vanguard Capital Management, LLC4.62%
  • D. E. Shaw & Co., L.P.4.15%
  • Two Sigma Investments, LP3.81%

By investor type

  • Mutual Fund73.16%
  • Hedge Fund14.99%
  • Individual/Insider4.31%
  • Public Company3.69%
  • Private Company3.17%
  • Insurance Company0.56%
  • Government Pension Fund0.35%
  • Family Office/Trust0.35%

Reported short interest has fallen from 16.20% to 13.54% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 21,565,154 13.5% 4.0
31 Aug 2026 20,213,781 12.7% 4.4
14 Aug 2026 21,437,861 13.5% 2.6
31 Jul 2026 22,594,904 14.4% 4.5
15 Jul 2026 25,531,692 16.3% 6.4
30 Jun 2026 25,354,952 16.2% 4.4

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