John Todd Koning
Insider
First SEC filing: April 21, 2021 · Latest: April 21, 2021
Insider at
Insider transactions
0 buys (P)
1 sells (S)
Net: $-986,192
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 13, 2026 | ATEC | S 10b5-1 | 79,789 | $12.36 | $986,192 | 600,721 Direct | -11.72% | Disposed | -15.1% (price as of 2026-10-05) |
| March 5, 2026 | ATEC | F | 68,910 | $12.57 | $866,199 | 680,510 Direct | -9.20% | Disposed | -16.5% (price as of 2026-10-05) |
| Feb. 25, 2026 | ATEC | A | 205,094 | · | · | 618,646 Direct | +49.59% | Acquired | (price as of 2026-10-05) |
| Feb. 25, 2026 | ATEC | A | 110,394 | · | · | 729,040 Direct | +17.84% | Acquired | (price as of 2026-10-05) |
| Feb. 25, 2026 | ATEC | A | 20,380 | · | · | 749,420 Direct | +2.80% | Acquired | (price as of 2026-10-05) |
| Feb. 25, 2026 | ATEC | A | 55,197 | · | · | 55,197 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 25, 2026 | ATEC | A | 55,197 | · | · | 55,197 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 8, 2025 | ATEC | F | 15,266 | $21.45 | $327,456 | 445,955 Direct | -3.31% | Disposed | -51.1% (price as of 2026-10-05) |
| Aug. 6, 2025 | ATEC | F | 5,315 | $15.34 | $81,532 | 461,221 Direct | -1.14% | Disposed | -31.6% (price as of 2026-10-05) |
| April 22, 2025 | ATEC | S 10b5-1 | 37,500 | $10.71 | $401,625 | 466,536 Direct | -7.44% | Disposed | -2.0% (price as of 2026-10-05) |
| April 1, 2025 | ATEC | A | 20,929 | · | · | 504,036 Direct | +4.33% | Acquired | (price as of 2026-10-05) |
| March 10, 2025 | ATEC | S 10b5-1 | 165,121 | $9.72 | $1,604,976 | 483,107 Direct | -25.47% | Disposed | 8.0% (price as of 2026-10-05) |
| Jan. 29, 2025 | ATEC | A | 120,952 | · | · | 514,308 Direct | +30.75% | Acquired | (price as of 2026-10-05) |
| Jan. 29, 2025 | ATEC | A | 114,322 | · | · | 628,630 Direct | +22.23% | Acquired | (price as of 2026-10-05) |
| Jan. 29, 2025 | ATEC | A | 19,598 | · | · | 648,228 Direct | +3.12% | Acquired | (price as of 2026-10-05) |
| April 24, 2024 | ATEC | S 10b5-1 | 37,500 | $12.82 | $480,750 | 393,356 Direct | -8.70% | Disposed | -18.1% (price as of 2026-10-05) |
| March 1, 2024 | ATEC | S 10b5-1 | 121,601 | $13.30 | $1,617,293 | 430,856 Direct | -22.01% | Disposed | -21.1% (price as of 2026-10-05) |
| Feb. 21, 2024 | ATEC | A | 31,746 | · | · | 552,457 Direct | +6.10% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2024 | ATEC | A | 129,612 | · | · | 545,164 Direct | +31.19% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2024 | ATEC | F | 24,453 | $16.68 | $407,876 | 520,711 Direct | -4.49% | Disposed | -37.1% (price as of 2026-10-05) |
| April 20, 2023 | ATEC | S 10b5-1 | 16,500 | $16.42 | $270,930 | 415,552 Direct | -3.82% | Disposed | -36.1% (price as of 2026-10-05) |
| Feb. 27, 2023 | ATEC | S 10b5-1 | 22,500 | $14.76 | $332,100 | 432,052 Direct | -4.95% | Disposed | -28.9% (price as of 2026-10-05) |
| Feb. 22, 2023 | ATEC | S 10b5-1 | 13,068 | $14.20 | $185,566 | 470,644 Direct | -2.70% | Disposed | -26.1% (price as of 2026-10-05) |
| Feb. 1, 2023 | ATEC | A | 90,242 | · | · | 386,503 Direct | +30.46% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2023 | ATEC | A | 64,806 | · | · | 451,309 Direct | +16.77% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2023 | ATEC | A | 32,403 | · | · | 483,712 Direct | +7.18% | Acquired | (price as of 2026-10-05) |
| April 28, 2022 | ATEC | F | 16,092 | $11.54 | $185,702 | 280,169 Direct | -5.43% | Disposed | -9.1% (price as of 2026-10-05) |
| March 18, 2022 | ATEC | F | 10,582 | $10.94 | $115,767 | 296,261 Direct | -3.45% | Disposed | -4.1% (price as of 2026-10-05) |
| Feb. 24, 2022 | ATEC | A | 60,161 | · | · | 306,843 Direct | +24.39% | Acquired | (price as of 2026-10-05) |
| Feb. 24, 2022 | ATEC | A | 50,000 | · | · | 246,682 Direct | +25.42% | Acquired | (price as of 2026-10-05) |
| Dec. 16, 2021 | ATEC | P | 5,000 | $11.17 | $55,850 | 196,682 Direct | +2.61% | Acquired | -6.0% (price as of 2026-10-05) |
| April 19, 2021 | ATEC | A | 40,000 | · | · | 190,000 Direct | +26.67% | Acquired | (price as of 2026-10-05) |
| April 19, 2021 | ATEC | A | 150,000 | · | · | 150,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 26, 2021 | MASI | A | 1,483 | $250.73 | $371,833 | 1,483 Direct | · | Acquired |
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 [F6] | Common Stock | · | · | 55,197 | Acquired |
| Feb. 25, 2026 | ATEC | Restricted Stock Units [F7] | Common Stock | · | · | 55,197 | Acquired |
| Feb. 26, 2021 | MASI | Non-Qualified Stock Option (Right to Buy) | Common Stock | $250.73 | Feb. 26, 2031 | 1,483 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| April 21, 2021 | ATEC | No securities are beneficially owned | 0 | Direct |
| Nov. 5, 2020 | MASI | Non-Qualified Stock Option (Right to Buy) | 12,000 | Direct |
| Nov. 5, 2020 | MASI | Non-Qualified Stock Option (Right to Buy) | 3,316 | Direct |
| Nov. 5, 2020 | MASI | Restricted Stock Units | 2,397 | Direct |
| Nov. 5, 2020 | MASI | Restricted Stock Units | 1,477 | Direct |
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 | $480,775 | · | · | · | $250,000 | · | $36,656 | $3,829,875 |
| 2024 | $467,115 | · | · | · | $162,500 | · | $35,602 | $2,616,961 |
| 2023 | $442,115 | · | · | · | $475,000 | · | $33,915 | $3,360,339 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.