David S Buzby
Insider
First SEC filing: June 4, 2026 · Latest: June 4, 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 |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 7, 2026 | STEM | M | 7,486 | · | · | 7,486 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 7, 2026 | STEM | M | 7,486 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| June 3, 2026 | STEM | A | 12,168 | · | · | 12,168 Direct | · | Acquired | (price as of 2026-10-05) |
| July 3, 2025 | STEM | G | 5,511 | · | · | 37,571 Indirect | +17.19% | Acquired | (price as of 2026-10-05) |
| July 3, 2025 | STEM | G | 5,511 | · | · | 478 Direct | -92.02% | Disposed | (price as of 2026-10-05) |
| June 4, 2025 | STEM | A | 149,723 | · | · | 149,723 Direct | · | Acquired | (price as of 2026-10-05) |
| May 29, 2025 | STEM | M | 110,236 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| May 29, 2025 | STEM | M | 110,236 | · | · | 230,025 Direct | +92.03% | Acquired | (price as of 2026-10-05) |
| Jan. 14, 2025 | STEM | A | 66,667 | · | · | 66,667 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 28, 2024 | STEM | A | 400,000 | · | · | 400,000 Direct | · | Acquired | (price as of 2026-10-05) |
| June 7, 2024 | STEM | M | 23,489 | · | · | 119,789 Direct | +24.39% | Acquired | (price as of 2026-10-05) |
| June 7, 2024 | STEM | M | 23,489 | · | · | 110,236 Direct | -17.57% | Disposed | (price as of 2026-10-05) |
| May 29, 2024 | STEM | A | 110,236 | · | · | 133,725 Direct | +469.31% | Acquired | (price as of 2026-10-05) |
| March 18, 2024 | STEM | P | 33,800 | $1.81 | $61,178 | 96,300 Direct | +54.08% | Acquired | -88.3% (price as of 2026-10-05) |
| March 18, 2024 | STEM | P | 33,800 | $1.81 | $61,178 | 768,448 Direct | +4.60% | Acquired | -88.3% (price as of 2026-10-05) |
| March 15, 2024 | STEM | P | 62,500 | $1.84 | $115,000 | 62,500 Direct | · | Acquired | -88.5% (price as of 2026-10-05) |
| March 15, 2024 | STEM | P | 62,500 | $1.84 | $115,000 | 734,648 Direct | +9.30% | Acquired | -88.5% (price as of 2026-10-05) |
| Sept. 15, 2023 | STEM | P | 62,000 | $4.82 | $298,840 | 620,711 Indirect | +11.10% | Acquired | -95.6% (price as of 2026-10-05) |
| June 20, 2023 | STEM | G | 20,498 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| June 20, 2023 | STEM | G | 20,498 | · | · | 641,209 Indirect | +3.30% | Acquired | (price as of 2026-10-05) |
| June 15, 2023 | STEM | M | 20,498 | · | · | 20,498 Direct | · | Acquired | (price as of 2026-10-05) |
| June 15, 2023 | STEM | M | 20,498 | · | · | 23,489 Direct | -46.60% | Disposed | (price as of 2026-10-05) |
| June 7, 2023 | STEM | A | 23,489 | · | · | 43,987 Direct | +114.59% | Acquired | (price as of 2026-10-05) |
| Sept. 9, 2022 | STEM | S | 50,000 | $16.21 | $810,500 | 558,711 Indirect | -8.21% | Disposed | -98.7% (price as of 2026-10-05) |
| Aug. 17, 2022 | STEM | S | 67,000 | $15.51 | $1,039,170 | 608,711 Indirect | -9.92% | Disposed | -98.6% (price as of 2026-10-05) |
| July 28, 2022 | STEM | A | 20,498 | · | · | 20,498 Direct | · | Acquired | (price as of 2026-10-05) |
| April 28, 2022 | STEM | M | 5,524 | · | · | 672,148 Direct | +0.83% | Acquired | (price as of 2026-10-05) |
| April 28, 2022 | STEM | M | 5,524 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| March 8, 2022 | STEM | S | 86,121 | $9.01 | $775,950 | 3,563 Indirect | -96.03% | Disposed | -97.6% (price as of 2026-10-05) |
| July 7, 2021 | STEM | M | 32,978 | $1.25 | $41,222 | 486,280 Direct | +7.28% | Acquired | -83.0% (price as of 2026-10-05) |
| July 7, 2021 | STEM | F | 1,209 | $34.11 | $41,239 | 485,071 Direct | -0.25% | Disposed | -99.4% (price as of 2026-10-05) |
| July 7, 2021 | STEM | M | 27,596 | $1.25 | $34,495 | 512,667 Direct | +5.69% | Acquired | -83.0% (price as of 2026-10-05) |
| July 7, 2021 | STEM | F | 1,012 | $34.11 | $34,519 | 511,655 Direct | -0.20% | Disposed | -99.4% (price as of 2026-10-05) |
| July 7, 2021 | STEM | M | 166,018 | $2.27 | $376,861 | 677,673 Direct | +32.45% | Acquired | -90.6% (price as of 2026-10-05) |
| July 7, 2021 | STEM | F | 11,049 | $34.11 | $376,881 | 666,624 Direct | -1.63% | Disposed | -99.4% (price as of 2026-10-05) |
| July 7, 2021 | STEM | M | 32,978 | · | · | 217,330 Direct | -13.17% | Disposed | (price as of 2026-10-05) |
| July 7, 2021 | STEM | M | 27,596 | · | · | 189,734 Direct | -12.70% | Disposed | (price as of 2026-10-05) |
| July 7, 2021 | STEM | M | 166,018 | · | · | 23,716 Direct | -87.50% | Disposed | (price as of 2026-10-05) |
| July 2, 2021 | STEM | A | 5,524 | · | · | 5,524 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 |
|---|---|---|---|---|---|---|---|
| Aug. 7, 2026 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 7,486 | Disposed |
| June 3, 2026 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 12,168 | Acquired |
| June 4, 2025 | STEM | Restricted Stock Unit | Common Stock, Par Value 0.0001 Per Share | · | · | 149,723 | Acquired |
| May 29, 2025 | STEM | Restricted Stock Unit | Common Stock, Par Value 0.0001 Per Share | · | · | 110,236 | Disposed |
| Jan. 14, 2025 | STEM | Stock Option (Right to Buy) | Common Stock, Par Value $0.0001 Per Share | $0.84 | Jan. 13, 2035 | 66,667 | Acquired |
| Aug. 28, 2024 | STEM | Stock Option (Right to Buy) | Common Stock, Par Value $0.0001 Per Share | $1.00 | Aug. 28, 2034 | 400,000 | Acquired |
| June 7, 2024 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | $0.00 | · | 23,489 | Disposed |
| May 29, 2024 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | $0.00 | · | 110,236 | Acquired |
| June 15, 2023 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 20,498 | Disposed |
| June 7, 2023 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 23,489 | Acquired |
| July 28, 2022 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 20,498 | Acquired |
| April 28, 2022 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 5,524 | Disposed |
| July 7, 2021 | STEM | Stock Option (Right to Buy) | Common Stock, Par Value $0.0001 Per Share | $1.25 | July 20, 2025 | 32,978 | Disposed |
| July 7, 2021 | STEM | Stock Option (Right to Buy) | Common Stock, Par Value $0.0001 Per Share | $1.25 | Oct. 27, 2025 | 27,596 | Disposed |
| July 7, 2021 | STEM | Stock Option (Right to Buy) | Common Stock, Par Value $0.0001 Per Share | $2.27 | Oct. 31, 2028 | 166,018 | Disposed |
| July 2, 2021 | STEM | Restricted Stock Unit | Common Stock, Par Value $0.0001 Per Share | · | · | 5,524 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 7 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Feb. 9, 2026 | SVIVW | Class B Ordinary Shares | 40,000 | Direct |
| Sept. 3, 2025 | GFUZ | Class B Ordinary Shares | 40,000 | Direct |
| May 25, 2021 | STEM | Common Stock | 453,302 | Direct |
| May 25, 2021 | STEM | Common Stock | 89,684 | Indirect |
| May 25, 2021 | STEM | Stock Option | 32,978 | Direct |
| May 25, 2021 | STEM | Stock Option | 27,596 | Direct |
| May 25, 2021 | STEM | Stock Option | 189,734 | 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 | $173,089 | · | · | · | · | · | · | $264,911 |
| 2024 | $289,062 | $282,787 | · | · | · | · | $11,708 | $887,557 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.