Matthew Scott Harris
Insider
First SEC filing: Feb. 3, 2021 · Latest: Feb. 3, 2021
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 |
|---|---|---|---|---|---|---|---|---|---|
| July 31, 2025 | ALT | A | 2,018 | $3.14 | $6,337 | 16,087 Direct | +14.34% | Acquired | -15.0% (price as of 2026-10-05) |
| March 7, 2025 | ALT | G | 67,787 | · | · | 14,069 Direct | -82.81% | Disposed | (price as of 2026-10-05) |
| Feb. 2, 2025 | ALT | M | 7,775 | · | · | 7,775 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 2, 2025 | ALT | F | 2,708 | $6.64 | $17,981 | 81,856 Direct | -3.20% | Disposed | -59.8% (price as of 2026-10-05) |
| Feb. 2, 2025 | ALT | M | 7,775 | · | · | 84,564 Direct | +10.13% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2025 | ALT | M | 6,166 | · | · | 0 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2025 | ALT | F | 2,109 | $6.64 | $14,004 | 76,789 Direct | -2.67% | Disposed | -59.8% (price as of 2026-10-05) |
| Feb. 1, 2025 | ALT | M | 6,166 | · | · | 78,898 Direct | +8.48% | Acquired | (price as of 2026-10-05) |
| Jan. 31, 2025 | ALT | A | 1,905 | $5.18 | $9,868 | 72,732 Direct | +2.69% | Acquired | -48.5% (price as of 2026-10-05) |
| Jan. 30, 2025 | ALT | M | 9,275 | · | · | 18,550 Direct | +100.00% | Acquired | (price as of 2026-10-05) |
| Jan. 30, 2025 | ALT | F | 3,173 | $7.00 | $22,211 | 70,827 Direct | -4.29% | Disposed | -61.9% (price as of 2026-10-05) |
| Jan. 30, 2025 | ALT | M | 9,275 | · | · | 74,000 Direct | +14.33% | Acquired | (price as of 2026-10-05) |
| Jan. 27, 2025 | ALT | A | 63,400 | · | · | 63,400 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 27, 2025 | ALT | A | 183,600 | · | · | 183,600 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 25, 2025 | ALT | M | 14,600 | · | · | 43,800 Direct | +50.00% | Acquired | (price as of 2026-10-05) |
| Jan. 25, 2025 | ALT | F | 4,994 | $6.98 | $34,858 | 64,725 Direct | -7.16% | Disposed | -61.7% (price as of 2026-10-05) |
| Jan. 25, 2025 | ALT | M | 14,600 | · | · | 69,719 Direct | +26.49% | Acquired | (price as of 2026-10-05) |
| July 31, 2024 | ALT | A | 1,486 | $5.41 | $8,039 | 55,119 Direct | +2.77% | Acquired | -50.6% (price as of 2026-10-05) |
| Feb. 2, 2024 | ALT | M | 7,775 | · | · | 15,550 Direct | -33.33% | Disposed | (price as of 2026-10-05) |
| Feb. 2, 2024 | ALT | F | 2,332 | $9.32 | $21,734 | 53,633 Direct | -4.17% | Disposed | -71.4% (price as of 2026-10-05) |
| Feb. 2, 2024 | ALT | M | 7,775 | · | · | 55,965 Direct | +16.13% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2024 | ALT | M | 6,166 | · | · | 6,166 Direct | -50.00% | Disposed | (price as of 2026-10-05) |
| Feb. 1, 2024 | ALT | F | 1,801 | $9.88 | $17,794 | 48,190 Direct | -3.60% | Disposed | -73.0% (price as of 2026-10-05) |
| Feb. 1, 2024 | ALT | M | 6,166 | · | · | 49,991 Direct | +14.07% | Acquired | (price as of 2026-10-05) |
| Jan. 31, 2024 | ALT | A | 3,257 | $2.69 | $8,761 | 43,825 Direct | +8.03% | Acquired | -0.7% (price as of 2026-10-05) |
| Jan. 30, 2024 | ALT | M | 9,275 | · | · | 27,825 Direct | -25.00% | Disposed | (price as of 2026-10-05) |
| Jan. 30, 2024 | ALT | F | 2,709 | $9.80 | $26,548 | 40,568 Direct | -6.26% | Disposed | -72.8% (price as of 2026-10-05) |
| Jan. 30, 2024 | ALT | M | 9,275 | · | · | 43,277 Direct | +27.28% | Acquired | (price as of 2026-10-05) |
| Jan. 25, 2024 | ALT | A | 58,400 | · | · | 58,400 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 25, 2024 | ALT | A | 163,200 | · | · | 163,200 Direct | · | Acquired | (price as of 2026-10-05) |
| July 31, 2023 | ALT | A | 691 | $2.81 | $1,942 | 34,002 Direct | +2.07% | Acquired | -5.0% (price as of 2026-10-05) |
| March 23, 2023 | ALT | P | 10,000 | $4.22 | $42,200 | 33,311 Direct | +42.90% | Acquired | -36.7% (price as of 2026-10-05) |
| Feb. 2, 2023 | ALT | M | 7,775 | · | · | 23,325 Direct | -25.00% | Disposed | (price as of 2026-10-05) |
| Feb. 2, 2023 | ALT | F | 2,364 | $15.04 | $35,555 | 23,311 Direct | -9.21% | Disposed | -82.2% (price as of 2026-10-05) |
| Feb. 2, 2023 | ALT | M | 7,775 | · | · | 25,675 Direct | +43.44% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2023 | ALT | M | 6,166 | · | · | 12,332 Direct | -33.33% | Disposed | (price as of 2026-10-05) |
| Feb. 1, 2023 | ALT | F | 2,183 | $13.78 | $30,082 | 17,900 Direct | -10.87% | Disposed | -80.6% (price as of 2026-10-05) |
| Feb. 1, 2023 | ALT | M | 6,166 | · | · | 20,083 Direct | +44.31% | Acquired | (price as of 2026-10-05) |
| Jan. 31, 2023 | ALT | A | 1,296 | $10.21 | $13,232 | 13,917 Direct | +10.27% | Acquired | -73.8% (price as of 2026-10-05) |
| Jan. 30, 2023 | ALT | A | 37,100 | · | · | 37,100 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 30, 2023 | ALT | A | 105,000 | · | · | 105,000 Direct | · | Acquired | (price as of 2026-10-05) |
| July 31, 2022 | ALT | A | 1,076 | $6.86 | $7,381 | 12,621 Direct | +9.32% | Acquired | -61.1% (price as of 2026-10-05) |
| Feb. 28, 2022 | ALT | M | 30,000 | · | · | 31,400 Direct | -48.86% | Disposed | (price as of 2026-10-05) |
| Feb. 28, 2022 | ALT | S 10b5-1 | 30,000 | $7.52 | $225,600 | 11,545 Direct | -72.21% | Disposed | -64.5% (price as of 2026-10-05) |
| Feb. 28, 2022 | ALT | M | 30,000 | $1.92 | $57,600 | 41,545 Direct | +259.85% | Acquired | 39.1% (price as of 2026-10-05) |
| Feb. 2, 2022 | ALT | A | 91,600 | · | · | 91,600 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 2, 2022 | ALT | A | 31,100 | · | · | 31,100 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2022 | ALT | M | 6,166 | · | · | 18,498 Direct | -25.00% | Disposed | (price as of 2026-10-05) |
| Feb. 1, 2022 | ALT | M | 6,166 | · | · | 13,728 Direct | +81.54% | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2022 | ALT | F | 2,183 | $7.98 | $17,420 | 11,545 Direct | -15.90% | Disposed | -66.5% (price as of 2026-10-05) |
| Jan. 31, 2022 | ALT | A | 1,800 | $6.86 | $12,348 | 7,562 Direct | +31.24% | Acquired | -61.1% (price as of 2026-10-05) |
| July 31, 2021 | ALT | A | 725 | $7.71 | $5,590 | 5,762 Direct | +14.39% | Acquired | -65.4% (price as of 2026-10-05) |
| Feb. 1, 2021 | ALT | A | 24,664 | · | · | 24,664 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 1, 2021 | ALT | A | 90,000 | · | · | 90,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 31, 2021 | ALT | A | 968 | $12.14 | $11,752 | 5,037 Direct | +23.79% | Acquired | -78.0% (price as of 2026-10-05) |
| Nov. 12, 2020 | ALT | S 10b5-1 | 4,015 | $10.02 | $40,230 | 4,069 Direct | -49.67% | Disposed | -73.4% (price as of 2026-10-05) |
| July 31, 2020 | ALT | A | 8,084 | $1.46 | $11,803 | 8,084 Direct | · | Acquired | 82.9% (price as of 2026-10-05) |
| Jan. 2, 2020 | ALT | A | 61,400 | · | · | 61,400 Direct | · | Acquired | (price as of 2026-10-05) |
| Sept. 9, 2019 | ALT | A | 107,000 | · | · | 107,000 Direct | · | Acquired | (price as of 2026-10-05) |
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. 2, 2025 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 7,775 | Acquired |
| Feb. 1, 2025 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 6,166 | Acquired |
| Jan. 30, 2025 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 9,275 | Acquired |
| Jan. 27, 2025 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 63,400 | Acquired |
| Jan. 27, 2025 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $7.00 | Jan. 27, 2035 | 183,600 | Acquired |
| Jan. 25, 2025 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 14,600 | Acquired |
| Feb. 2, 2024 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 7,775 | Disposed |
| Feb. 1, 2024 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 6,166 | Disposed |
| Jan. 30, 2024 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 9,275 | Disposed |
| Jan. 25, 2024 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 58,400 | Acquired |
| Jan. 25, 2024 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $9.28 | Jan. 25, 2034 | 163,200 | Acquired |
| Feb. 2, 2023 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 7,775 | Disposed |
| Feb. 1, 2023 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 6,166 | Disposed |
| Jan. 30, 2023 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 37,100 | Acquired |
| Jan. 30, 2023 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $12.88 | Jan. 30, 2033 | 105,000 | Acquired |
| Feb. 28, 2022 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $1.92 | Jan. 2, 2030 | 30,000 | Disposed |
| Feb. 2, 2022 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $7.53 | Feb. 2, 2032 | 91,600 | Acquired |
| Feb. 2, 2022 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 31,100 | Acquired |
| Feb. 1, 2022 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 6,166 | Disposed |
| Feb. 1, 2021 | ALT | Restricted Stock Units | Common Stock, par value $0.0001 | · | · | 24,664 | Acquired |
| Feb. 1, 2021 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $16.71 | Feb. 1, 2031 | 90,000 | Acquired |
| Jan. 2, 2020 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $1.92 | Jan. 2, 2030 | 61,400 | Acquired |
| Sept. 9, 2019 | ALT | Stock Options (option to buy) | Common Stock, par value $0.0001 | $2.13 | Sept. 9, 2029 | 107,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
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 |
|---|---|---|---|---|---|---|---|---|
| 2019 | $115,032 | · | · | · | · | · | $1,233 | $287,590 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.