Insider · CIK 0001986259
Matthew Tappin
Files at STEM (STEM, INC.). First filing Jun 18, 2025, latest Mar 13, 2026.
Matthew Tappin files SEC Form 4 as president at STEM (STEM, INC.). Since Jun 18, 2025, Matthew Tappin has reported 0 open-market buys worth $0 and 6 open-market sells worth $200k, the latest filed on Mar 13, 2026.
A track record needs three past buys with six months of prices behind them; Matthew Tappin has 0, so none is measured yet.
The newest scored trade: sold $4,354 of STEM on Mar 11, 2026, filed Mar 13, 2026, scored 20 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 5 sells worth $190k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
STEM: STEM, INC.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 20Weak | STEM, INC. | $4,354 402 shares | -12% | +80% from low-64% from high | |
| 25Weak | STEM, INC. | $7,284 655 shares | -17% | +84% from low-64% from high | |
| 40Moderate | STEM, INC. | $4,751 485 shares | -17% | +61% from low-68% from high | |
| 33Weak | STEM, INC. | $4,172 366 shares | -14% | +91% from low-62% from high | |
| 59Moderate | STEM, INC. | $170k 9,584 shares | -84% | +216% from low-37% from high | |
| 0Weak | STEM, INC. | $9,895 21,987 shares | -37% | +66% from low-60% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Mar 11, 2026 | STEM STEM, INC. | 402 0.00% of outstanding | $4,354 | Mar 11, 2026 | $22k |
| Mar 10, 2026 | STEM STEM, INC. | 655 0.01% of outstanding | $7,284 | Mar 10, 2026 | $15k |
| Mar 4, 2026 | STEM STEM, INC. | 185 0.00% of outstanding | $1,850 | Mar 4, 2026 | $13k |
| Mar 3, 2026 | STEM STEM, INC. | 300 0.00% of outstanding | $2,901 | Mar 3, 2026 | $10k |
| Feb 20, 2026 | STEM STEM, INC. | 366 0.00% of outstanding | $4,172 | Feb 20, 2026 | $5,848 |
| Feb 19, 2026 | STEM STEM, INC. | 522 0.01% of outstanding | $5,848 | Feb 19, 2026 | none |
| Nov 12, 2025 | STEM STEM, INC. | 9,584 0.11% of outstanding | $170k | Nov 11, 2025 | $99k |
| Nov 10, 2025 | STEM STEM, INC. | 5,416 0.06% of outstanding | $99k | Nov 10, 2025 | none |
| Jun 16, 2025 | STEM STEM, INC. | 20,823 0.01% of outstanding | $9,370 | Jun 16, 2025 | $525 |
| May 30, 2025 | STEM STEM, INC. | 1,164 0.00% of outstanding | $525 | May 30, 2025 | $7,649 |
| Mar 12, 2025 | STEM STEM, INC. | 13,070 0.01% of outstanding | $5,286 | Mar 12, 2025 | $7,459 |
| Mar 7, 2025 | STEM STEM, INC. | 5,645 0.00% of outstanding | $2,364 | Mar 7, 2025 | $5,095 |
| Feb 20, 2025 | STEM STEM, INC. | 8,130 0.01% of outstanding | $5,095 | Feb 20, 2025 | none |
Transactions
Every row this insider has filed, 28 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Mar 11, 2026 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share10b5-1 | -402 | $10.83 | $4,354 | 2,823 | Mar 13, 2026 |
| Mar 7, 2026 | STEM STEM, INC. | MOption exercise Common Stock, Par Value $0.0001 Per Share | +1,458 | - | - | 3,880 | Mar 10, 2026 |
| Mar 10, 2026 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share | -655 | $11.12 | $7,284 | 3,225 | Mar 10, 2026 |
| Mar 7, 2026 | STEM STEM, INC. | MOption exercise Restricted Stock Unitderivative | -1,458 | $0.00 | $0 | 1,459 | Mar 10, 2026 |
| Mar 3, 2026 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share | -300 | $9.67 | $2,901 | 2,607 | Mar 4, 2026 |
| Mar 4, 2026 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share | -185 | $10.00 | $1,850 | 2,422 | Mar 4, 2026 |
| Mar 1, 2026 | STEM STEM, INC. | MOption exercise Common Stock, Par Value $0.0001 Per Share | +670 | - | - | 2,907 | Mar 2, 2026 |
| Feb 26, 2026 | STEM STEM, INC. | AGrant or award Restricted Stock Unitderivative | +25,800 | $0.00 | $0 | 25,800 | Mar 2, 2026 |
| Feb 26, 2026 | STEM STEM, INC. | AGrant or award Performance Stock Unitderivative | +17,200 | $0.00 | $0 | 17,200 | Mar 2, 2026 |
| Mar 1, 2026 | STEM STEM, INC. | MOption exercise Restricted Stock Unitderivative | -670 | $0.00 | $0 | 0 | Mar 2, 2026 |
| Feb 20, 2026 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share | -366 | $11.40 | $4,172 | 2,237 | Feb 23, 2026 |
| Feb 19, 2026 | STEM STEM, INC. | FTax withholding Common Stock, Par Value $0.0001 Per Share | -522 | $11.30 | $5,899 | 2,603 | Feb 19, 2026 |
| Feb 15, 2026 | STEM STEM, INC. | MOption exercise Common Stock, Par Value $0.0001 Per Share | +1,253 | - | - | 3,125 | Feb 18, 2026 |
| Feb 15, 2026 | STEM STEM, INC. | MOption exercise Restricted Stock Unitderivative | -1,253 | $0.00 | $0 | 0 | Feb 18, 2026 |
| Nov 11, 2025 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share | -9,584 | $17.70 | $170k | 1,872 | Nov 24, 2025 |
| Nov 7, 2025 | STEM STEM, INC. | MOption exercise Common Stock, Par Value $0.0001 Per Share | +15,000 | - | - | 16,872 | Nov 12, 2025 |
| Nov 10, 2025 | STEM STEM, INC. | FTax withholding Common Stock, Par Value $0.0001 Per Share | -5,416 | $18.27 | $99k | 11,456 | Nov 12, 2025 |
| Nov 7, 2025 | STEM STEM, INC. | MOption exercise Restricted Stock Unitderivative | -15,000 | $0.00 | $0 | 0 | Nov 12, 2025 |
| Jul 28, 2025 | STEM STEM, INC. | AGrant or award Restricted Stock Unitderivative | +10,000 | $0.00 | $0 | 10,000 | Jul 30, 2025 |
| Jul 28, 2025 | STEM STEM, INC. | AGrant or award Performance Stock Unitderivative | +10,000 | $0.00 | $0 | 10,000 | Jul 30, 2025 |
| Jun 30, 2025 | STEM STEM, INC. | AGrant or award Restricted Stock Unitderivative | +11,000 | $0.00 | $0 | 11,000 | Jul 2, 2025 |
| Jun 30, 2025 | STEM STEM, INC. | AGrant or award Performance Stock Unitderivative | +5,500 | $0.00 | $0 | 5,500 | Jul 2, 2025 |
| Jun 30, 2025 | STEM STEM, INC. | AGrant or award Stock Optionsderivative | +5,500 | $0.00 | $0 | 5,500 | Jul 2, 2025 |
| May 29, 2025 | STEM STEM, INC. | MOption exercise Common Stock, Par Value $0.0001 Per Share10b5-1 | +2,775 | $0.00 | $0 | 59,445 | Jun 18, 2025 |
| May 30, 2025 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share10b5-1 | -1,164 | $0.45 | $525 | 58,281 | Jun 18, 2025 |
| Jun 16, 2025 | STEM STEM, INC. | SOpen-market sale Common Stock, Par Value $0.0001 Per Share10b5-1 | -20,823 | $0.45 | $9,370 | 37,458 | Jun 18, 2025 |
| May 29, 2025 | STEM STEM, INC. | MOption exercise Restricted Stock Unitderivative10b5-1 | -2,775 | $0.00 | $0 | 396,784 | Jun 18, 2025 |
| Nov 1, 2024 | STEM STEM, INC. | AGrant or award Restricted Stock Unitderivative | +300,000 | $0.00 | $0 | 466,439 | Nov 1, 2024 |
Questions about Matthew Tappin
Answered from the filings on this page, as of the latest one.
Is Matthew Tappin buying or selling?
In the last 12 months Matthew Tappin reported 0 open-market buys worth $0 and 5 open-market sells worth $190k on SEC Form 4; the latest was sold $4,354 of STEM on Mar 11, 2026. Grants, option exercises and tax withholding are not counted.
How did Matthew Tappin's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Matthew Tappin has 0.
Where does Matthew Tappin file Form 4?
Matthew Tappin has filed Form 4 at STEM (STEM, INC.) as President, Software Products. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.