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Ambiq Micro AMBQ

US equityMarket cap rank #2934
$65.92 −$2.26 (-3.31%)
Pre-market · Oct 6, 7:30 am ET · After hours $65.27 -0.99%
Open$69.51
Prev close$68.18
Day range$65.87 – $69.51
Volume509.1K
Market cap$1.59B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership86.5%-0.84 pts vs. prior quarter
Institutions holding217+3 vs. prior quarter
Insider trades (recent)27 buys / 22 sellsNet buying
Short interest8.73% of floatDays to cover 4.7 · as of 15 Sep 2026
Short-sale volume share24.2%5-day average of daily volume

Short-sale volume as % of daily volume

16%21%26%31%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$4.12M (7 inflow days, 13 outflow days).

The five largest holders on file together own 26.8% of shares outstanding.

Largest holders

  • Kleiner Perkins Caufield & Byers LLC8.61%
  • BlackRock5.71%
  • T. Rowe Price Group, Inc.4.81%
  • D. E. Shaw & Co., L.P.4.07%
  • Atreides Management, LP3.63%
  • State Street Global Advisors3.56%
  • Vanguard Capital Management, LLC3.52%
  • EDB Investments Pte Ltd3.37%

By investor type

  • Mutual Fund40.97%
  • Hedge Fund22.43%
  • VC/PE Fund14.60%
  • Public Company4.31%
  • Private Company3.19%
  • Individual/Insider1.79%
  • Government Pension Fund0.95%
  • Sovereign Wealth Fund0.04%

Reported short interest has risen from 7.40% to 8.73% 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 2,110,814 8.7% 4.7
31 Aug 2026 1,809,791 7.5% 4.3
14 Aug 2026 1,723,765 7.1% 4.0
31 Jul 2026 1,763,291 7.4% 3.1
15 Jul 2026 1,766,758 7.4% 3.5
30 Jun 2026 1,764,435 7.4% 1.7

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