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Alphatec ATEC

US equityMarket cap rank #2926Medical Devices
$10.54 −$0.18 (-1.68%)
Pre-market · Oct 7, 6:00 am ET · After hours $10.54 0.00%
Open$10.77
Prev close$10.72
Day range$10.49 – $10.89
Volume1.91M
Market cap$1.63B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership86.0%-1.34 pts vs. prior quarter
Institutions holding313-2 vs. prior quarter
Insider trades (recent)22 buys / 27 sellsNet selling
Short interest9.34% of floatDays to cover 5.5 · as of 15 Sep 2026
Short-sale volume share25.8%5-day average of daily volume

Short-sale volume as % of daily volume

22%24%26%29%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$2.01M (7 inflow days, 13 outflow days).

Net flow by order size, last 20 sessions

+$16.7KSuper−$2.0MBig−$1.2MMid−$764.4KSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 26.4% of shares outstanding.

Largest holders

  • BlackRock7.33%
  • Squadron Capital, LLC6.73%
  • Braidwell LP4.23%
  • American Century Investment Management4.22%
  • LS Power Development, LLC3.93%
  • Vanguard Capital Management, LLC3.87%
  • Patrick Miles3.26%
  • BNPP Asset Management Holding2.29%

By investor type

  • Mutual Fund54.31%
  • Hedge Fund13.61%
  • Individual/Insider10.31%
  • VC/PE Fund6.73%
  • Public Company4.98%
  • Private Company4.65%
  • Government Pension Fund0.96%
  • Insurance Company0.37%

Reported short interest has fallen from 9.50% to 9.34% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Insider transactions

DateInsiderTitleTransactionSharesPriceHeld after
13 Sep 2026 Thomas Carls Executive Vice President, Data Intelligence & Strategy Initial Statement of Beneficial +0 – 2,520
9 Sep 2026 Patrick Miles Chairperson & CEO Open Market Acquisition +115,000 $8.81 5,033,603
4 Aug 2026 Tyson Marshall General Counsel Automatic Disposition -8,168 $9.65 275,159
10 Jun 2026 Karen McGinnis Independent Director Automatic Disposition -6,050 $8.01 62,659
9 Jun 2026 David Demski Independent Director Other Acquisition +32,012 – 134,501
9 Jun 2026 Mortimer Berkowitz Lead Independent Director Other Acquisition +32,012 – 32,012
9 Jun 2026 Karen McGinnis Independent Director Other Acquisition +32,012 – 32,012
9 Jun 2026 Keith Valentine Special Advisor to the Board Other Acquisition +32,012 – 50,721
9 Jun 2026 David Pelizzon Independent Director Other Acquisition +32,012 – 32,012
9 Jun 2026 Quentin Blackford Independent Director Other Acquisition +32,012 – 32,012
10 May 2026 Keith Valentine Special Advisor to the Board Open Market Acquisition +135,000 $7.54 213,562
6 Apr 2026 Tyson Marshall General Counsel Derivative Exercise and Sale -23,393 $11.03 268,327
6 Apr 2026 Tyson Marshall General Counsel Derivative Exercise and Retained +79,107 $3.34 268,327
12 Mar 2026 J. Koning Chief Financial Officer Automatic Disposition -79,789 $12.36 206,104
12 Mar 2026 Scott Lish Officer Open Market Disposition -260,535 $12.30 815,704
10 Mar 2026 David Sponsel Executive Vice President of Sales Automatic Disposition -163,452 $12.52 91,666
8 Mar 2026 Craig Hunsaker Executive VP of People and Culture Other Disposition -600 – 1,188,179
8 Mar 2026 Craig Hunsaker Executive VP of People and Culture Open Market Disposition -82,765 $12.45 1,188,179
5 Mar 2026 Craig Hunsaker Executive VP of People and Culture Automatic Disposition -33,602 $12.22 1,188,179
4 Mar 2026 Patrick Miles Chairperson & CEO Sale to Issuer -219,749 $12.57 4,918,603

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 14,429,283 9.3% 5.5
31 Aug 2026 13,672,295 8.9% 9.4
14 Aug 2026 13,630,117 8.8% 4.8
31 Jul 2026 13,788,007 9.0% 7.3
15 Jul 2026 13,748,220 8.9% 5.7
30 Jun 2026 14,616,529 9.5% 3.6

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