Sponsel David

Officer · ATEC

As of 2026-09-16, Sponsel David has 26 Form 4 transactions on record across 1 company — 12 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market sales filed in March in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $5.3MIndirect: $0$5.3Mas of 2026-09-16
  • Direct $5.3M
  • Indirect $0
ATECdirect504,932 sh$5.3M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

ATEC · 26 trades
2026-03-11: Sale, 163,452 sh ($2.0M)2026-02-25: Award / grant, 205,094 sh ($0)2026-02-25: Award / grant, 46,705 sh ($0)2026-02-25: Award / grant, 93,410 sh ($0)2026-02-25: Award / grant, 20,380 sh2026-02-25: Award / grant, 20,380 sh2026-02-05: Sale, 60,425 sh ($833K)2025-12-10: Sale, 21,106 sh ($439K)2025-12-08: Sale, 988 sh ($21K)2025-10-24: Sale, 70,000 sh ($1.1M)2025-09-19: Sale, 2,555 sh ($39K)2025-09-18: Sale, 137,445 sh ($2.1M)2025-08-06: Withheld for tax, 982 sh ($15K)2025-04-01: Award / grant, 3,866 sh2025-04-01: Award / grant, 3,866 sh2025-03-06: Sale, 33,732 sh ($365K)2025-02-25: Sale, 19,419 sh ($202K)2025-02-24: Sale, 12,946 sh ($139K)2025-02-03: Sale, 36,256 sh ($414K)2025-01-29: Award / grant, 133,591 sh ($0)2025-01-29: Award / grant, 114,322 sh ($0)2025-01-29: Award / grant, 21,106 sh2025-01-29: Award / grant, 21,106 sh2025-01-13: Sale, 58,283 sh ($624K)2025-01-10: Sale, 238 sh ($2K)2024-12-11: Sale, 62,018 sh ($601K)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-03-11ATECSale163,452 @ $12.52$2.0M−24.5% of holding504,932Form 4
2026-02-05ATECSale60,425 @ $13.79$833K−14.7% of holding349,500Form 4
2025-12-10ATECSale21,106 @ $20.79$439K−4.6% of holding439,767Form 4
2025-12-08ATECSale988 @ $21.45$21K−0.2% of holding460,873Form 4
2025-10-24ATECSale70,000 @ $16.18$1.1M−13.2% of holding461,861Form 4
2025-09-19ATECSale2,555 @ $15.34$39K−0.5% of holding531,861Form 4
2025-09-18ATECSale137,445 @ $15.09$2.1M−20.5% of holding534,416Form 4
2025-03-06ATECSale33,732 @ $10.83$365K−4.8% of holding668,977Form 4
2025-02-25ATECSale19,419 @ $10.41$202K−2.7% of holding702,709Form 4
2025-02-24ATECSale12,946 @ $10.73$139K−1.8% of holding722,128Form 4
2025-02-03ATECSale36,256 @ $11.42$414K−4.7% of holding735,074Form 4
2025-01-13ATECSale58,283 @ $10.71$624K−10.4% of holding502,311Form 4
2025-01-10ATECSale238 @ $10.00$2K−0.0% of holding560,594Form 4
2024-12-11ATECSale62,018 @ $9.69$601K−10.0% of holding560,832Form 4
12 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-02-25ATECAward / grant205,094554,594Form 4
2026-02-25ATECAward / grant46,70546,705Form 4
2026-02-25ATECAward / grant93,410648,004Form 4
2026-02-25ATECAward / grant20,380668,384Form 4
2026-02-25ATECAward / grant20,380668,384Form 4
2025-08-06ATECWithheld for tax982671,861Form 4
2025-04-01ATECAward / grant3,866672,843Form 4
2025-04-01ATECAward / grant3,866672,843Form 4
2025-01-29ATECAward / grant133,591635,902Form 4
2025-01-29ATECAward / grant114,322750,224Form 4
2025-01-29ATECAward / grant21,106771,330Form 4
2025-01-29ATECAward / grant21,106771,330Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.