David Sponsel
CIK: 0001772837
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Alphatec Holdings, Inc.
Discretionary Trading P&L
Holdings
Transaction History (22 total)
- Mar 11, 2026ATEC
Alphatec Holdings, Inc.
Sale(S)Direct163.5K shares at avg. $12.52$2.0M - Feb 25, 2026ATEC
Alphatec Holdings, Inc.
Award(A)Direct93.4K shares- - Feb 25, 2026ATEC
Alphatec Holdings, Inc.
Award(A)Direct20.4K shares- - Feb 25, 2026ATEC
Alphatec Holdings, Inc.
Award(A)Direct205.1K shares- - Feb 5, 2026ATEC
Alphatec Holdings, Inc.
Sale(S)Direct60.4K shares at avg. $13.79$833K - Dec 10, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct21.1K shares at avg. $20.79$439K - Dec 8, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct988 shares at avg. $21.45$21K - Oct 24, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct70K shares at avg. $16.18$1.1M - Sep 19, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct2.6K shares at avg. $15.34$39K - Sep 18, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct137.4K shares at avg. $15.09$2.1M - Aug 6, 2025ATEC
Alphatec Holdings, Inc.
Tax Payment(F)Direct982 shares at avg. $15.34$15K - Apr 1, 2025ATEC
Alphatec Holdings, Inc.
Award(A)Direct3.9K shares- - Mar 6, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct33.7K shares at avg. $10.83$365K - Feb 25, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct19.4K shares at avg. $10.41$202K - Feb 24, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct12.9K shares at avg. $10.73$139K - Feb 3, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct36.3K shares at avg. $11.42$414K - Jan 29, 2025ATEC
Alphatec Holdings, Inc.
Award(A)Direct21.1K shares- - Jan 29, 2025ATEC
Alphatec Holdings, Inc.
Award(A)Direct114.3K shares- - Jan 29, 2025ATEC
Alphatec Holdings, Inc.
Award(A)Direct133.6K shares- - Jan 13, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct58.3K shares at avg. $10.71$624K - Jan 10, 2025ATEC
Alphatec Holdings, Inc.
Sale(S)Direct238 shares at avg. $10.00$2K - Dec 11, 2024ATEC
Alphatec Holdings, Inc.
Sale(S)Direct62K shares at avg. $9.69$601K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Mar 11, 2026 | ATEC Alphatec Holdings, Inc. | Sale(S) | 163,452 | $12.52 | $2,046,419 | Direct |
| Feb 25, 2026 | ATEC Alphatec Holdings, Inc. | Award(A) | 93,410 | - | $0 | Direct |
| Feb 25, 2026 | ATEC Alphatec Holdings, Inc. | Award(A) | 20,380 | - | $0 | Direct |
| Feb 25, 2026 | ATEC Alphatec Holdings, Inc. | Award(A) | 205,094 | - | $0 | Direct |
| Feb 5, 2026 | ATEC Alphatec Holdings, Inc. | Sale(S) | 60,425 | $13.79 | $833,261 | Direct |
| Dec 10, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 21,106 | $20.79 | $438,794 | Direct |
| Dec 8, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 988 | $21.45 | $21,193 | Direct |
| Oct 24, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 70,000 | $16.18 | $1,132,600 | Direct |
| Sep 19, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 2,555 | $15.34 | $39,194 | Direct |
| Sep 18, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 137,445 | $15.09 | $2,074,045 | Direct |
| Aug 6, 2025 | ATEC Alphatec Holdings, Inc. | Tax Payment(F) | 982 | $15.34 | $15,064 | Direct |
| Apr 1, 2025 | ATEC Alphatec Holdings, Inc. | Award(A) | 3,866 | - | - | Direct |
| Mar 6, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 33,732 | $10.83 | $365,318 | Direct |
| Feb 25, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 19,419 | $10.41 | $202,152 | Direct |
| Feb 24, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 12,946 | $10.73 | $138,911 | Direct |
| Feb 3, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 36,256 | $11.42 | $414,044 | Direct |
| Jan 29, 2025 | ATEC Alphatec Holdings, Inc. | Award(A) | 21,106 | - | $0 | Direct |
| Jan 29, 2025 | ATEC Alphatec Holdings, Inc. | Award(A) | 114,322 | - | $0 | Direct |
| Jan 29, 2025 | ATEC Alphatec Holdings, Inc. | Award(A) | 133,591 | - | $0 | Direct |
| Jan 13, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 58,283 | $10.71 | $624,211 | Direct |
| Jan 10, 2025 | ATEC Alphatec Holdings, Inc. | Sale(S) | 238 | $10.00 | $2,380 | Direct |
| Dec 11, 2024 | ATEC Alphatec Holdings, Inc. | Sale(S) | 62,018 | $9.69 | $600,954 | Direct |
1-22 of 22 transactions
About Sponsel David
Sponsel David (SEC CIK 0001772837) files insider reports with the SEC as EVP, SALES of Alphatec Holdings, Inc. (ATEC).
Signal8 holds 15 ownership filings by Sponsel David, all Form 4s, filed between Dec 13, 2024 and Mar 13, 2026. Those filings report 22 transactions, from Dec 11, 2024 to Mar 11, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Sponsel David's filings is in CARLSBAD, CA.
Recent filings by Sponsel David
- Mar 11, 2026: Open-market sale of ATEC shares (Form 4, code S).
- Feb 25, 2026: Grants or awards of ATEC shares (3 lines, Form 4, code A).
- Feb 5, 2026: Open-market sale of ATEC shares (Form 4, code S).
- Dec 10, 2025: Open-market sale of ATEC shares (Form 4, code S).
- Dec 8, 2025: Open-market sale of ATEC shares (Form 4, code S).
Other insiders filing for Alphatec Holdings, Inc. (ATEC)
- Demski David M, Director
- Carls Thomas Andrew, EVP, Data & Imaging Solutions
- Miles Patrick, CEO
- Marshall Tyson Eliot, GENERAL COUNSEL & CORP. SEC.
- MCGINNIS KAREN K, Director
- Blackford Quentin S., Director