Comparable stake leader
Squadron Capital LLC
SEC ownership of Alphatec Holdings, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001350653.
Disclosed value leader
Squadron Capital LLC
Comparable rows
2/50
Latest evidence
10 Sep 2026
- Public ticker
- ATEC on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Squadron Capital LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
2 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Squadron Capital LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
10 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001350653
- Issuer location
- Carlsbad, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Alphatec Holdings, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Squadron Capital LLC
Disclosed value leader
Squadron Capital LLC
Comparable rows
2/50
Latest evidence
10 Sep 2026
13D/G
3/4/5
13F
Lead comparable stake: 8.9%
48 rows are not safely comparable across share classes.
13D/G row: Squadron Capital LLC
Showing 1-8 of 50 holder rows.
Quick read
Squadron Capital LLC leads the comparable SEC ownership view at 8.9%.
2 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Squadron Capital LLC's linked filing trail.
Comparable ownership
Top 2
Squadron Capital LLC
8.9%
L-5 Healthcare Partners, LLC
5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Squadron Capital LLC |
13D/G
3/4/5
Jennifer N. Pritzker · 10%+ Owner
|
8.9%
Reported 13D/G
· 15 Dec 2025
|
$259,293,623
13,215,781 shares
|
$0 | 15 Dec 2025 |
| L-5 Healthcare Partners, LLC |
3/4/5
13D/G
Director by deputization, 10%+ Owner
|
5%
Reported 13D/G
· 23 Apr 2025
|
$166,223,070
11,081,538 shares
|
— | 10 May 2023 |
| Jennifer N. Pritzker |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$225,036,896
10,703,045 shares
|
-$15,650,098 | 08 Dec 2025 |
| Squadron Capital Holdings LLC |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$223,865,296
10,645,045 shares
|
-$15,650,098 | 08 Dec 2025 |
| Paul Segal |
3/4/5
Director
|
—
denominator unverified
|
$147,384,455
11,081,538 shares
|
— | 15 Jun 2023 |
| David R. Pelizzon |
3/4/5
Director
|
—
denominator unverified
|
$117,219,857
10,773,884 shares
|
-$20,565,098 | 10 Jun 2026 |
| BlackRock, Inc. |
13F
Company
|
—
denominator unverified
|
$97,975,756
11,326,677 shares
|
— | 30 Jun 2026 |
| BRAIDWELL LP |
13F
Company
|
—
denominator unverified
|
$56,496,947
6,531,439 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$93,755,096.
Buys
$2,009,342
Insiders: 2
Sells
$95,764,438
Insiders: 13
Net
-$93,755,096
Shares: -4,724,321
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 250,000
Shares: 4,974,321
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 115,000 | 8,168 | $1,013,150 | $78,821 | +$934,329 |
| 3-6 | 135,000 | 6,050 | $996,192 | $48,460 | +$947,732 |
| 6-9 | 0 | 806,761 | $0 | $10,170,578 | -$10,170,578 |
| 9-12 | 0 | 4,153,342 | $0 | $85,466,578 | -$85,466,578 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 30 reporting-owner rows connected to Alphatec Holdings, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
30
Largest Forms 3/4/5 holder
Jennifer N. Pritzker
Net 12M change
-$93,755,095
Latest report
05 Oct 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jennifer N. Pritzker | 10%+ Owner | $225,036,896 | -$15,650,098 | -6.5% | Mixed | 08 Dec 2025 |
| Squadron Capital LLC | 10%+ Owner | $223,865,296 | -$15,650,098 | -6.5% | Filing P/S | 08 Dec 2025 |
| Squadron Capital Holdings LLC | 10%+ Owner | $223,865,296 | -$15,650,098 | -6.5% | Filing P/S | 08 Dec 2025 |
| L-5 Healthcare Partners, LLC | Director by deputization, 10%+ Owner | $166,223,070 | Mixed | 10 May 2023 | ||
| Paul Segal | Director | $147,384,455 | Mixed | 15 Jun 2023 | ||
| David R. Pelizzon | Director | $117,219,857 | -$20,565,098 | -15% | Mixed | 10 Jun 2026 |
| Patrick Miles | CEO, Director | $54,178,969 | -$5,194,850 | -8.7% | Mixed | 10 Sep 2026 |
| Ward W. Woods Jr. | Director | $28,008,326 | Mixed | 11 Jun 2025 | ||
| James L. L. Tullis | Director | $25,761,387 | Mixed | 31 Dec 2023 | ||
| Craig E. Hunsaker | Evp, People & Culture | $23,243,953 | -$4,664,627 | -17% | Mixed | 06 Mar 2026 |
| Mortimer Berkowitz III | Director | $16,728,085 | Mixed | 09 Sep 2025 | ||
| Scott Lish | Chief Operating Officer | $10,033,159 | -$4,323,903 | -30% | Filing P/S | 13 Mar 2026 |
| Brian Snider | Evp, Marketing | $9,830,730 | Mixed | 05 Aug 2022 | ||
| Kelli M. Howell | Evp, Clinical Strategies | $8,101,470 | Mixed | 05 Aug 2022 | ||
| Jeffrey P. Rydin | Director | $7,446,720 | -$3,864,000 | -34% | Filing P/S | 03 Nov 2025 |
| John Todd Koning | Chief Financial Officer | $7,424,911 | -$986,192 | -12% | Filing P/S | 13 Mar 2026 |
| Evan Bakst | Director | $6,657,322 | Mixed | 23 Aug 2024 | ||
| Quentin S. Blackford | Director | $6,532,145 | Mixed | 10 Jun 2026 | ||
| David Sponsel | Evp, Sales | $6,321,748 | -$4,472,266 | -41% | Filing P/S | 11 Mar 2026 |
| Tyson E. Marshall | General Counsel & Corp. Sec. | $6,083,340 | -$3,045,596 | -33% | Filing P/S | 05 Aug 2026 |
Recent insider transactions for Alphatec Holdings, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Thomas Andrew Carls | ATEC | Common Stock | Award | 7936.5% | 200,000 | 202,520 | 05 Oct 2026 | Direct | ||
| Patrick Miles | ATEC | Common Stock | Purchase | 1.99% | $1,013,150 | $8.81 | 115,000 | 5,893,551 | 10 Sep 2026 | Direct |
| Tyson E. Marshall | ATEC | Common Stock | Sale | -1.28% | $78,821 | $9.65 | -8,168 | 630,398 | 05 Aug 2026 | Direct |
| Karen K. Mcginnis | ATEC | Common Stock | Sale | -6.01% | $48,460 | $8.01 | -6,050 | 94,671 | 11 Jun 2026 | Direct |
| Karen K. Mcginnis | ATEC | Common Stock | Award | 46.6% | 32,012 | 100,721 | 10 Jun 2026 | Direct | ||
| Quentin S. Blackford | ATEC | Common Stock | Award | 5.63% | 32,012 | 600,381 | 10 Jun 2026 | Direct | ||
| Keith Valentine | ATEC | Common Stock | Award | 13.8% | 32,012 | 264,283 | 10 Jun 2026 | Direct | ||
| David R. Pelizzon | ATEC | Common Stock | Award | 9.23% | 32,012 | 378,839 | 10 Jun 2026 | Direct | ||
| David M. Demski | ATEC | Common Stock | Award | 8.01% | 32,012 | 431,635 | 10 Jun 2026 | Direct | ||
| Mortimer Berkowitz III | ATEC | Common Stock | Award | 5.18% | 32,012 | 650,062 | 10 Jun 2026 | Direct | ||
| Keith Valentine | ATEC | Common Stock | Purchase | 17.7% | $245,000 | $7.00 | 35,000 | 232,271 | 11 May 2026 | Direct |
| Keith Valentine | ATEC | Common Stock | Purchase | 28.6% | $330,606 | $7.54 | 43,847 | 197,271 | 08 May 2026 | Direct |
| Keith Valentine | ATEC | Common Stock | Purchase | 57.7% | $420,586 | $7.49 | 56,153 | 153,424 | 07 May 2026 | Direct |
| Tyson E. Marshall | ATEC | Common Stock | Tax liability | -3.53% | -23,393 | 638,566 | 07 Apr 2026 | Direct | ||
| Tyson E. Marshall | ATEC | Common Stock | Options Exercise | 18.3% | 102,500 | 661,959 | 07 Apr 2026 | Direct | ||
| Tyson E. Marshall | ATEC | Employee Stock Option (right to buy) | Options Exercise | -100% | -87,500 | 0 | 07 Apr 2026 | Direct | ||
| John Todd Koning | ATEC | Common Stock | Sale | -11.7% | $986,192 | $12.36 | -79,789 | 600,721 | 13 Mar 2026 | Direct |
| Scott Lish | ATEC | Common Stock | Sale | -24.2% | $3,204,580 | $12.30 | -260,535 | 815,704 | 13 Mar 2026 | Direct |
| David Sponsel | ATEC | Common Stock | Sale | -24.4% | $2,046,419 | $12.52 | -163,452 | 504,932 | 11 Mar 2026 | Direct |
| Craig E. Hunsaker | ATEC | Common Stock | Gift | -0.03% | -600 | 1,725,609 | 09 Mar 2026 | Direct | ||
| Craig E. Hunsaker | ATEC | Common Stock | Sale | -4.58% | $1,030,424 | $12.45 | -82,765 | 1,726,209 | 09 Mar 2026 | Direct |
| Craig E. Hunsaker | ATEC | Common Stock | Sale | -1.82% | $410,616 | $12.22 | -33,602 | 1,808,974 | 06 Mar 2026 | Direct |
| John Todd Koning | ATEC | Common Stock | Tax liability | -9.2% | -68,910 | 680,510 | 05 Mar 2026 | Direct | ||
| Patrick Miles | ATEC | Common Stock | Tax liability | -3.66% | -219,749 | 5,778,551 | 05 Mar 2026 | Direct | ||
| Tyson E. Marshall | ATEC | Common Stock | Sale | -13.7% | $1,109,549 | $12.49 | -88,835 | 559,459 | 05 Mar 2026 | Direct |
| Tyson E. Marshall | ATEC | Common Stock | Award | 87.7% | 302,852 | 648,294 | 25 Feb 2026 | Direct | ||
| Tyson E. Marshall | ATEC | Restricted Stock Units | Award | 84,918 | 42,459 | 25 Feb 2026 | Direct | |||
| David Sponsel | ATEC | Common Stock | Award | 91.2% | 318,884 | 668,384 | 25 Feb 2026 | Direct | ||
| David Sponsel | ATEC | Restricted Stock Units | Award | 93,410 | 46,705 | 25 Feb 2026 | Direct | |||
| John Todd Koning | ATEC | Common Stock | Award | 81.2% | 335,868 | 749,420 | 25 Feb 2026 | Direct | ||
| John Todd Koning | ATEC | Restricted Stock Units | Award | 110,394 | 55,197 | 25 Feb 2026 | Direct | |||
| Scott Lish | ATEC | Common Stock | Award | 74.5% | 459,480 | 1,076,239 | 25 Feb 2026 | Direct | ||
| Scott Lish | ATEC | Restricted Stock Units | Award | 127,378 | 63,689 | 25 Feb 2026 | Direct | |||
| Craig E. Hunsaker | ATEC | Common Stock | Award | 33.2% | 459,480 | 1,842,576 | 25 Feb 2026 | Direct | ||
| Craig E. Hunsaker | ATEC | Restricted Stock Units | Award | 127,378 | 63,689 | 25 Feb 2026 | Direct | |||
| Patrick Miles | ATEC | Common Stock | Award | 19.2% | 966,293 | 5,998,300 | 25 Feb 2026 | Direct | ||
| Patrick Miles | ATEC | Restricted Stock Units | Award | 305,706 | 152,853 | 25 Feb 2026 | Direct | |||
| Craig E. Hunsaker | ATEC | Common Stock | Tax liability | -2.89% | -41,105 | 1,383,096 | 12 Feb 2026 | Direct | ||
| Craig E. Hunsaker | ATEC | Common Stock | Options Exercise | 21.4% | 251,176 | 1,424,201 | 12 Feb 2026 | Direct | ||
| Craig E. Hunsaker | ATEC | Employee Stock Option (right to buy) | Options Exercise | -100% | -251,176 | 0 | 12 Feb 2026 | Direct | ||
| David Sponsel | ATEC | Common Stock | Sale | -14.7% | $833,261 | $13.79 | -60,425 | 349,500 | 05 Feb 2026 | Direct |
| Craig E. Hunsaker | ATEC | Common Stock | Sale | -3.09% | $549,536 | $14.71 | -37,358 | 1,173,025 | 03 Feb 2026 | Direct |
| Patrick Miles | ATEC | Common Stock | Sale | -1.91% | $2,101,000 | $21.01 | -100,000 | 5,135,398 | 05 Jan 2026 | Direct |
| Scott Lish | ATEC | Common Stock | Sale | -3.01% | $390,836 | $19.64 | -19,900 | 641,432 | 16 Dec 2025 | Direct |
| David R. Pelizzon | ATEC | Common Stock | Sale | -2.35% | $4,915,000 | $19.66 | -250,000 | 10,395,045 | 16 Dec 2025 | By Squadron Capital LLC |
| David M. Demski | ATEC | Common Stock | Sale | -6.98% | $636,000 | $21.20 | -30,000 | 399,623 | 11 Dec 2025 | Direct |
| Craig E. Hunsaker | ATEC | Common Stock | Sale | -2.53% | $679,051 | $20.84 | -32,584 | 1,256,558 | 10 Dec 2025 | Direct |
| David Sponsel | ATEC | Common Stock | Sale | -4.58% | $438,794 | $20.79 | -21,106 | 439,767 | 10 Dec 2025 | Direct |
| David R. Pelizzon | ATEC | Common Stock | Sale | -0.27% | $606,379 | $21.03 | -28,834 | 10,645,045 | 09 Dec 2025 | By Squadron Capital LLC |
| Squadron Capital LLC | ATEC | Common Stock | Sale | -0.27% | $606,379 | $21.03 | -28,834 | 10,645,045 | 09 Dec 2025 | Direct |
* marks a reported price that did not pass the local price check.