David Sponsel
Insider
First SEC filing: April 8, 2019 · Latest: April 8, 2019
Insider at
Insider transactions
0 buys (P)
5 sells (S)
Net: $-4,472,267
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 11, 2026 | ATEC | S 10b5-1 | 163,452 | $12.52 | $2,046,419 | 504,932 Direct | -24.45% | Disposed | -19.9% (price as of 2026-10-02) |
| Feb. 25, 2026 | ATEC | A | 205,094 | · | · | 554,594 Direct | +58.68% | Acquired | (price as of 2026-10-02) |
| Feb. 25, 2026 | ATEC | A | 93,410 | · | · | 648,004 Direct | +16.84% | Acquired | (price as of 2026-10-02) |
| Feb. 25, 2026 | ATEC | A | 20,380 | · | · | 668,384 Direct | +3.15% | Acquired | (price as of 2026-10-02) |
| Feb. 25, 2026 | ATEC | A | 46,705 | · | · | 46,705 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 25, 2026 | ATEC | A | 46,705 | · | · | 46,705 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 5, 2026 | ATEC | S 10b5-1 | 60,425 | $13.79 | $833,261 | 349,500 Direct | -14.74% | Disposed | -27.3% (price as of 2026-10-02) |
| Dec. 10, 2025 | ATEC | S 10b5-1 | 21,106 | $20.79 | $438,794 | 439,767 Direct | -4.58% | Disposed | -51.8% (price as of 2026-10-02) |
| Dec. 8, 2025 | ATEC | S | 988 | $21.45 | $21,193 | 460,873 Direct | -0.21% | Disposed | -53.2% (price as of 2026-10-02) |
| Oct. 24, 2025 | ATEC | S 10b5-1 | 70,000 | $16.18 | $1,132,600 | 461,861 Direct | -13.16% | Disposed | -38.0% (price as of 2026-10-02) |
| Sept. 19, 2025 | ATEC | S 10b5-1 | 2,555 | $15.34 | $39,194 | 531,861 Direct | -0.48% | Disposed | -34.6% (price as of 2026-10-02) |
| Sept. 18, 2025 | ATEC | S 10b5-1 | 137,445 | $15.09 | $2,074,045 | 534,416 Direct | -20.46% | Disposed | -33.5% (price as of 2026-10-02) |
| Aug. 6, 2025 | ATEC | F | 982 | $15.34 | $15,064 | 671,861 Direct | -0.15% | Disposed | -34.6% (price as of 2026-10-02) |
| April 1, 2025 | ATEC | A | 3,866 | · | · | 672,843 Direct | +0.58% | Acquired | (price as of 2026-10-02) |
| March 6, 2025 | ATEC | S 10b5-1 | 33,732 | $10.83 | $365,318 | 668,977 Direct | -4.80% | Disposed | -7.4% (price as of 2026-10-02) |
| Feb. 25, 2025 | ATEC | S 10b5-1 | 19,419 | $10.41 | $202,152 | 702,709 Direct | -2.69% | Disposed | -3.7% (price as of 2026-10-02) |
| Feb. 24, 2025 | ATEC | S 10b5-1 | 12,946 | $10.73 | $138,911 | 722,128 Direct | -1.76% | Disposed | -6.5% (price as of 2026-10-02) |
| Feb. 3, 2025 | ATEC | S 10b5-1 | 36,256 | $11.42 | $414,044 | 735,074 Direct | -4.70% | Disposed | -12.2% (price as of 2026-10-02) |
| Jan. 29, 2025 | ATEC | A | 133,591 | · | · | 635,902 Direct | +26.60% | Acquired | (price as of 2026-10-02) |
| Jan. 29, 2025 | ATEC | A | 114,322 | · | · | 750,224 Direct | +17.98% | Acquired | (price as of 2026-10-02) |
| Jan. 29, 2025 | ATEC | A | 21,106 | · | · | 771,330 Direct | +2.81% | Acquired | (price as of 2026-10-02) |
| Jan. 13, 2025 | ATEC | S 10b5-1 | 58,283 | $10.71 | $624,211 | 502,311 Direct | -10.40% | Disposed | -6.3% (price as of 2026-10-02) |
| Jan. 10, 2025 | ATEC | S 10b5-1 | 238 | $10.00 | $2,380 | 560,594 Direct | -0.04% | Disposed | 0.3% (price as of 2026-10-02) |
| Dec. 11, 2024 | ATEC | S 10b5-1 | 62,018 | $9.69 | $600,954 | 560,832 Direct | -9.96% | Disposed | 3.5% (price as of 2026-10-02) |
| Feb. 27, 2024 | ATEC | S 10b5-1 | 32,365 | $15.19 | $491,624 | 622,296 Direct | -4.94% | Disposed | -34.0% (price as of 2026-10-02) |
| Feb. 21, 2024 | ATEC | A | 35,063 | · | · | 672,481 Direct | +5.50% | Acquired | (price as of 2026-10-02) |
| Feb. 21, 2024 | ATEC | S 10b5-1 | 17,820 | $15.34 | $273,359 | 654,661 Direct | -2.65% | Disposed | -34.6% (price as of 2026-10-02) |
| Feb. 14, 2024 | ATEC | S 10b5-1 | 2,500 | $16.16 | $40,400 | 637,418 Direct | -0.39% | Disposed | -37.9% (price as of 2026-10-02) |
| Feb. 2, 2024 | ATEC | S 10b5-1 | 36,620 | $16.47 | $603,131 | 639,918 Direct | -5.41% | Disposed | -39.1% (price as of 2026-10-02) |
| Feb. 1, 2024 | ATEC | A | 121,258 | · | · | 676,538 Direct | +21.84% | Acquired | (price as of 2026-10-02) |
| Jan. 16, 2024 | ATEC | S 10b5-1 | 2,500 | $15.00 | $37,500 | 555,280 Direct | -0.45% | Disposed | -33.1% (price as of 2026-10-02) |
| Dec. 21, 2023 | ATEC | S 10b5-1 | 2,500 | $15.00 | $37,500 | 557,780 Direct | -0.45% | Disposed | -33.1% (price as of 2026-10-02) |
| June 15, 2023 | ATEC | S 10b5-1 | 55,577 | $16.17 | $898,680 | 559,840 Direct | -9.03% | Disposed | -38.0% (price as of 2026-10-02) |
| May 15, 2023 | ATEC | F | 68,174 | $15.59 | $1,062,833 | 615,417 Direct | -9.97% | Disposed | -35.7% (price as of 2026-10-02) |
| April 26, 2023 | ATEC | F | 35,590 | $16.15 | $574,778 | 683,591 Direct | -4.95% | Disposed | -37.9% (price as of 2026-10-02) |
| March 6, 2023 | ATEC | S 10b5-1 | 16,823 | $15.82 | $266,140 | 719,181 Direct | -2.29% | Disposed | -36.6% (price as of 2026-10-02) |
| Feb. 1, 2023 | ATEC | A | 98,078 | · | · | 645,061 Direct | +17.93% | Acquired | (price as of 2026-10-02) |
| Feb. 1, 2023 | ATEC | A | 60,629 | · | · | 705,690 Direct | +9.40% | Acquired | (price as of 2026-10-02) |
| Feb. 1, 2023 | ATEC | A | 30,314 | · | · | 736,004 Direct | +4.30% | Acquired | (price as of 2026-10-02) |
| Jan. 9, 2023 | ATEC | S 10b5-1 | 10,000 | $11.99 | $119,900 | 546,983 Direct | -1.80% | Disposed | -16.3% (price as of 2026-10-02) |
| Dec. 5, 2022 | ATEC | S 10b5-1 | 10,000 | $9.88 | $98,800 | 556,983 Direct | -1.76% | Disposed | 1.5% (price as of 2026-10-02) |
| Nov. 7, 2022 | ATEC | S 10b5-1 | 10,000 | $9.25 | $92,500 | 566,690 Direct | -1.73% | Disposed | 8.4% (price as of 2026-10-02) |
| Aug. 11, 2022 | ATEC | F | 620 | $8.91 | $5,524 | 576,690 Direct | -0.11% | Disposed | 12.6% (price as of 2026-10-02) |
| June 3, 2022 | ATEC | F | 3,099 | $7.46 | $23,119 | 577,310 Direct | -0.53% | Disposed | 34.5% (price as of 2026-10-02) |
| May 17, 2022 | ATEC | F | 34,087 | $8.26 | $281,559 | 580,409 Direct | -5.55% | Disposed | 21.4% (price as of 2026-10-02) |
| April 28, 2022 | ATEC | F | 33,517 | $11.54 | $386,786 | 613,051 Direct | -5.18% | Disposed | -13.1% (price as of 2026-10-02) |
| March 18, 2022 | ATEC | F | 10,582 | $10.94 | $115,767 | 646,568 Direct | -1.61% | Disposed | -8.3% (price as of 2026-10-02) |
| Feb. 24, 2022 | ATEC | A | 65,385 | · | · | 657,150 Direct | +11.05% | Acquired | (price as of 2026-10-02) |
| Feb. 24, 2022 | ATEC | A | 50,000 | · | · | 591,765 Direct | +9.23% | Acquired | (price as of 2026-10-02) |
| Nov. 12, 2021 | ATEC | S | 9,847 | $11.56 | $113,831 | 541,765 Direct | -1.79% | Disposed | -13.2% (price as of 2026-10-02) |
| Aug. 5, 2021 | ATEC | F | 620 | $15.23 | $9,443 | 550,598 Direct | -0.11% | Disposed | -34.1% (price as of 2026-10-02) |
| July 1, 2021 | ATEC | F | 3,099 | $15.32 | $47,477 | 551,218 Direct | -0.56% | Disposed | -34.5% (price as of 2026-10-02) |
| June 16, 2021 | ATEC | S | 10,000 | $14.78 | $147,800 | 554,317 Direct | -1.77% | Disposed | -32.1% (price as of 2026-10-02) |
| May 17, 2021 | ATEC | F | 34,087 | $14.81 | $504,828 | 564,317 Direct | +6.43% | Acquired | -32.3% (price as of 2026-10-02) |
| May 3, 2021 | ATEC | M | 12,813 | · | · | 7,187 Direct | -64.07% | Disposed | (price as of 2026-10-02) |
| May 3, 2021 | ATEC | M | 17,187 | · | · | 7,813 Direct | -68.75% | Disposed | (price as of 2026-10-02) |
| May 3, 2021 | ATEC | S 10b5-1 | 30,000 | $15.97 | $479,100 | 598,184 Direct | -4.78% | Disposed | -37.2% (price as of 2026-10-02) |
| May 3, 2021 | ATEC | M | 12,813 | $3.17 | $40,617 | 628,184 Direct | +2.08% | Acquired | 216.4% (price as of 2026-10-02) |
| May 3, 2021 | ATEC | M | 17,187 | $3.86 | $66,342 | 615,371 Direct | +2.87% | Acquired | 159.8% (price as of 2026-10-02) |
| April 26, 2021 | ATEC | S 10b5-1 | 14,572 | $16.63 | $242,332 | 598,184 Direct | -2.38% | Disposed | -39.7% (price as of 2026-10-02) |
| Feb. 18, 2021 | ATEC | A | 40,000 | · | · | 612,756 Direct | -6.13% | Disposed | (price as of 2026-10-02) |
| Oct. 12, 2020 | ATEC | S 10b5-1 | 89,999 | $9.47 | $852,291 | 571,840 Direct | -13.60% | Disposed | 5.9% (price as of 2026-10-02) |
| April 22, 2020 | ATEC | A | 216,422 | · | · | 661,839 Direct | +48.59% | Acquired | (price as of 2026-10-02) |
| April 6, 2020 | ATEC | A | 2,398 | $3.93 | $9,424 | 445,417 Direct | +0.54% | Acquired | 155.2% (price as of 2026-10-02) |
| March 11, 2020 | ATEC | P | 11,000 | $4.51 | $49,610 | 443,019 Direct | +2.55% | Acquired | 122.4% (price as of 2026-10-02) |
| May 13, 2019 | ATEC | A | 68,750 | · | · | 431,556 Direct | +18.95% | Acquired | (price as of 2026-10-02) |
| May 13, 2019 | ATEC | A | 275,000 | · | · | 358,750 Direct | +328.36% | Acquired | (price as of 2026-10-02) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Feb. 25, 2026 | ATEC | Restricted Stock Units [F5] | Common Stock | · | · | 46,705 | Acquired |
| Feb. 25, 2026 | ATEC | Restricted Stock Units [F6] | Common Stock | · | · | 46,705 | Acquired |
| May 3, 2021 | ATEC | Employee Stock Option (right to buy) | Common Stock | $3.17 | Nov. 2, 2028 | 12,813 | Disposed |
| May 3, 2021 | ATEC | Employee Stock Option (right to buy) | Common Stock | $3.86 | May 29, 2028 | 17,187 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $445,390 | · | · | · | $450,000 | · | $34,355 | $3,954,407 |
| 2024 | $435,385 | · | · | · | $175,000 | · | $36,955 | $2,803,029 |
| 2023 | $400,000 | · | · | · | $525,000 | · | $35,845 | $3,214,860 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.