David Michael Johnson
Insider
First SEC filing: Oct. 28, 2021 · Latest: June 18, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
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 |
|---|---|---|---|---|---|---|---|---|---|
| June 16, 2026 | ZNTL | A | 57,100 | · | · | 307,521 Direct | +22.80% | Acquired | (price as of 2026-10-02) |
| June 11, 2026 | AURA | A | 30,000 | · | · | 30,000 Direct | · | Acquired | (price as of 2026-10-02) |
| June 11, 2026 | AURA | A | 15,000 | · | · | 194,167 Direct | +8.37% | Acquired | (price as of 2026-10-02) |
| June 17, 2025 | ZNTL | A | 57,603 | · | · | 250,421 Direct | +29.87% | Acquired | (price as of 2026-10-02) |
| June 17, 2025 | AURA | A | 17,000 | · | · | 17,000 Direct | · | Acquired | (price as of 2026-10-02) |
| June 17, 2025 | AURA | A | 13,000 | · | · | 179,167 Direct | +7.82% | Acquired | (price as of 2026-10-02) |
| May 16, 2025 | AURA | P | 5,000 | · | · | 5,000 Direct | · | Acquired | (price as of 2026-10-02) |
| May 16, 2025 | AURA | P | 20,000 | $4.90 | $98,000 | 166,167 Direct | +13.68% | Acquired | 24.3% (price as of 2026-10-02) |
| June 21, 2024 | ZNTL | A | 48,429 | · | · | 192,818 Direct | +33.54% | Acquired | (price as of 2026-10-02) |
| June 20, 2024 | AURA | A | 14,500 | · | · | 14,500 Direct | · | Acquired | (price as of 2026-10-02) |
| June 20, 2024 | AURA | A | 10,500 | · | · | 146,167 Direct | +7.74% | Acquired | (price as of 2026-10-02) |
| Nov. 10, 2023 | ZNTL | P | 17,000 | $9.88 | $167,960 | 144,389 Direct | +13.34% | Acquired | -74.5% (price as of 2026-10-02) |
| Nov. 8, 2023 | AURA | P | 10,000 | $7.30 | $73,000 | 75,000 Indirect | +15.38% | Acquired | -16.6% (price as of 2026-10-02) |
| Nov. 8, 2023 | AURA | P | 10,000 | $7.30 | $73,000 | 75,000 Indirect | +15.38% | Acquired | -16.6% (price as of 2026-10-02) |
| Nov. 8, 2023 | AURA | P | 9,601 | $7.30 | $70,087 | 135,667 Direct | +7.62% | Acquired | -16.6% (price as of 2026-10-02) |
| Nov. 7, 2023 | AURA | P | 47,000 | $7.17 | $336,990 | 65,000 Indirect | +261.11% | Acquired | -15.1% (price as of 2026-10-02) |
| Nov. 7, 2023 | AURA | P | 47,000 | $7.17 | $336,990 | 65,000 Indirect | +261.11% | Acquired | -15.1% (price as of 2026-10-02) |
| Nov. 7, 2023 | AURA | P | 76,000 | $7.17 | $544,920 | 126,066 Direct | +151.80% | Acquired | -15.1% (price as of 2026-10-02) |
| Oct. 4, 2023 | AURA | P | 6,566 | $8.61 | $56,533 | 50,066 Direct | +15.09% | Acquired | -29.3% (price as of 2026-10-02) |
| Oct. 3, 2023 | AURA | P | 13,500 | $8.27 | $111,645 | 43,500 Direct | +45.00% | Acquired | -26.4% (price as of 2026-10-02) |
| June 16, 2023 | ZNTL | A | 19,059 | · | · | 127,389 Direct | +17.59% | Acquired | (price as of 2026-10-02) |
| June 7, 2023 | AURA | A | 16,000 | · | · | 16,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 6, 2023 | AURA | P | 700 | $10.50 | $7,350 | 18,000 Indirect | +4.05% | Acquired | -42.0% (price as of 2026-10-02) |
| Jan. 6, 2023 | AURA | P | 904 | $10.51 | $9,501 | 18,000 Indirect | +5.29% | Acquired | -42.1% (price as of 2026-10-02) |
| Jan. 5, 2023 | AURA | P | 300 | $10.00 | $3,000 | 17,300 Indirect | +1.76% | Acquired | -39.1% (price as of 2026-10-02) |
| Jan. 5, 2023 | AURA | P | 96 | $10.00 | $960 | 17,096 Indirect | +0.56% | Acquired | -39.1% (price as of 2026-10-02) |
| Dec. 28, 2022 | AURA | P | 2,000 | $9.75 | $19,500 | 17,000 Indirect | +13.33% | Acquired | -37.5% (price as of 2026-10-02) |
| Dec. 28, 2022 | AURA | P | 2,000 | $9.75 | $19,500 | 17,000 Indirect | +13.33% | Acquired | -37.5% (price as of 2026-10-02) |
| Dec. 1, 2022 | AURA | P | 5,000 | $12.37 | $61,850 | 15,000 Indirect | +50.00% | Acquired | -50.8% (price as of 2026-10-02) |
| Dec. 1, 2022 | AURA | P | 5,000 | $12.37 | $61,850 | 15,000 Indirect | +50.00% | Acquired | -50.8% (price as of 2026-10-02) |
| June 15, 2022 | AURA | A | 16,000 | · | · | 16,000 Direct | · | Acquired | (price as of 2026-10-02) |
| June 13, 2022 | AURA | P | 20,000 | $13.99 | $279,800 | 30,000 Direct | +200.00% | Acquired | -56.5% (price as of 2026-10-02) |
| June 13, 2022 | AURA | P | 7,000 | $13.99 | $97,930 | 10,000 Indirect | +233.33% | Acquired | -56.5% (price as of 2026-10-02) |
| June 13, 2022 | AURA | P | 7,000 | $13.99 | $97,930 | 10,000 Indirect | +233.33% | Acquired | -56.5% (price as of 2026-10-02) |
| June 10, 2022 | AURA | P | 10,000 | $15.04 | $150,400 | 10,000 Direct | · | Acquired | -59.5% (price as of 2026-10-02) |
| June 10, 2022 | AURA | P | 3,000 | $15.04 | $45,120 | 3,000 Indirect | · | Acquired | -59.5% (price as of 2026-10-02) |
| June 10, 2022 | AURA | P | 3,000 | $15.04 | $45,120 | 3,000 Indirect | · | Acquired | -59.5% (price as of 2026-10-02) |
| June 8, 2022 | ZNTL | A | 24,871 | · | · | 108,330 Direct | +29.80% | Acquired | (price as of 2026-10-02) |
| Nov. 2, 2021 | AURA | C | 139,672 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Nov. 2, 2021 | AURA | C | 139,672 | · | · | 139,672 Indirect | · | Acquired | (price as of 2026-10-02) |
| Oct. 28, 2021 | AURA | A | 24,000 | · | · | 24,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Oct. 4, 2021 | ZNTL | S 10b5-1 | 4,892 | $65.95 | $322,627 | 88,963 Direct | -5.21% | Disposed | -96.2% (price as of 2026-10-02) |
| Oct. 4, 2021 | ZNTL | S 10b5-1 | 7,904 | $66.58 | $526,248 | 81,059 Direct | -8.88% | Disposed | -96.2% (price as of 2026-10-02) |
| Oct. 4, 2021 | ZNTL | S 10b5-1 | 100 | $67.20 | $6,720 | 80,959 Direct | -0.12% | Disposed | -96.3% (price as of 2026-10-02) |
| June 4, 2021 | ZNTL | A | 7,500 | · | · | 96,355 Direct | +8.44% | Acquired | (price as of 2026-10-02) |
| June 4, 2021 | ZNTL | A | 22,500 | · | · | 22,500 Direct | · | Acquired | (price as of 2026-10-02) |
| June 4, 2021 | ZNTL | A | 5,000 | · | · | 93,855 Direct | +5.63% | Acquired | (price as of 2026-10-02) |
| June 4, 2021 | ZNTL | A | 15,000 | · | · | 15,000 Direct | · | Acquired | (price as of 2026-10-02) |
| April 5, 2021 | ZNTL | S 10b5-1 | 12,897 | $43.50 | $561,020 | 88,855 Direct | -12.67% | Disposed | -94.2% (price as of 2026-10-02) |
| Dec. 2, 2020 | ZNTL | S 10b5-1 | 1,600 | $49.80 | $79,680 | 113,048 Direct | -1.40% | Disposed | -94.9% (price as of 2026-10-02) |
| Dec. 2, 2020 | ZNTL | S 10b5-1 | 3,868 | $50.82 | $196,572 | 109,180 Direct | -3.42% | Disposed | -95.0% (price as of 2026-10-02) |
| Dec. 2, 2020 | ZNTL | S 10b5-1 | 4,603 | $51.61 | $237,561 | 104,577 Direct | -4.22% | Disposed | -95.1% (price as of 2026-10-02) |
| Dec. 2, 2020 | ZNTL | S 10b5-1 | 2,825 | $52.72 | $148,934 | 101,752 Direct | -2.70% | Disposed | -95.2% (price as of 2026-10-02) |
| April 7, 2020 | ZNTL | P 10b5-1 | 4,000 | $18.00 | $72,000 | 114,648 Direct | +3.62% | Acquired | -86.0% (price as of 2026-10-02) |
| April 7, 2020 | ZNTL | A | 51,587 | · | · | 110,648 Direct | +87.35% | 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 |
|---|---|---|---|---|---|---|---|
| June 11, 2026 | AURA | Stock Option (Right to Buy) | Common Stock | $6.21 | June 11, 2036 | 30,000 | Acquired |
| June 17, 2025 | AURA | Stock Option (Right to Buy) | Common Stock | $6.18 | June 17, 2035 | 17,000 | Acquired |
| May 16, 2025 | AURA | Common Stock Warrants (right to buy) | Common Stock | $4.90 | May 16, 2030 | 5,000 | Acquired |
| June 20, 2024 | AURA | Stock Option (Right to Buy) | Common Stock | $6.93 | June 20, 2034 | 14,500 | Acquired |
| June 7, 2023 | AURA | Stock Option (Right to Buy) | Common Stock | $12.83 | June 7, 2033 | 16,000 | Acquired |
| June 15, 2022 | AURA | Stock Option (Right to Buy) | Common Stock | $13.72 | June 15, 2032 | 16,000 | Acquired |
| Nov. 2, 2021 | AURA | Series E Convertible Preferred Stock | Common Stock | · | · | 139,672 | Disposed |
| Oct. 28, 2021 | AURA | Stock Option (Right to Buy) | Common Stock | $14.00 | Oct. 27, 2031 | 24,000 | Acquired |
| June 4, 2021 | ZNTL | Stock Option (Right to Buy) | Common Stock | $52.25 | June 3, 2031 | 22,500 | Acquired |
| June 4, 2021 | ZNTL | Stock Option (Right to Buy) | Common Stock | $52.25 | June 3, 2031 | 15,000 | 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 |
|---|---|---|---|---|
| Oct. 28, 2021 | AURA | Series E Convertible Preferred Stock | 139,672 | Indirect |
| Oct. 28, 2021 | AURA | Stock Option (Right to Buy) | 116,788 | Direct |
| Oct. 28, 2021 | AURA | Stock Option (Right to Buy) | 204,379 | Direct |
| April 3, 2020 | ZNTL | Common Stock | 59,061 | Direct |
| April 3, 2020 | ZNTL | Stock Option | 30,000 | Direct |