Matthew Tappin

CIK 1986259 · View on SEC EDGAR ↗

Insider

First SEC filing: July 24, 2023 · Latest: July 24, 2023

On this page

Insider at

Insider transactions

0 buys (P) 1 sells (S) Net: $-7,819 + 17 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

17 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
July 2, 2026 STEM S 996 $7.85 $7,819 9,577 Direct -9.42% Disposed -27.0% (price as of 2026-08-20)
June 16, 2025 STEM S 10b5-1 20,823 $0.45 $9,370 37,458 Direct -35.73% Disposed -36.3% (price as of 2026-08-20)
May 30, 2025 STEM S 1,164 $0.45 $524 58,281 Direct -1.96% Disposed -36.3% (price as of 2026-08-20)
March 12, 2025 STEM S 13,070 $0.40 $5,228 56,670 Direct -18.74% Disposed -28.4% (price as of 2026-08-20)
March 7, 2025 STEM S 5,645 $0.42 $2,371 40,573 Direct -12.21% Disposed -31.8% (price as of 2026-08-20)
Feb. 20, 2025 STEM S 8,130 $0.63 $5,122 32,821 Direct -19.85% Disposed -54.5% (price as of 2026-08-20)

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 30, 2026 STEM Performance Stock Unit Common Stock, Par Value $0.0001 Per Share (5,000) — — 5,000 Disposed
June 30, 2026 STEM Performance Stock Unit Common Stock, Par Value $0.0001 Per Share (2,750) — — 2,750 Disposed
July 28, 2025 STEM Performance Stock Unit Common Stock, Par Value 0.0001 Per Share (10,000) — — 10,000 Acquired
July 28, 2025 STEM Restricted Stock Unit Common Stock, Par Value 0.0001 Per Share (10,000) — — 10,000 Acquired
June 30, 2025 STEM Stock Options Common Stock, Par Value 0.0001 Per Share (5,500) $6.23 June 30, 2035 5,500 Acquired
June 30, 2025 STEM Performance Stock Unit Common Stock, Par Value 0.0001 Per Share (5,500) — — 5,500 Acquired
June 30, 2025 STEM Restricted Stock Unit Common Stock, Par Value 0.0001 Per Share (11,000) — — 11,000 Acquired
May 29, 2025 STEM Restricted Stock Unit Common Stock, Par Value $0.0001 Per Share (2,775) $0.00 — 2,775 Disposed
March 11, 2025 STEM Restricted Stock Unit Common Stock, Par Value $0.0001 Per Share (29,167) $0.00 — 29,167 Disposed
March 6, 2025 STEM Restricted Stock Unit Common Stock, Par Value $0.0001 Per Share (13,397) $0.00 — 13,397 Disposed
Feb. 19, 2025 STEM Restricted Stock Unit Common Stock, Par Value $0.0001 Per Share (24,316) $0.00 — 24,316 Disposed

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 4 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
July 24, 2023 STEM Restricted Stock Unit→ Common Stock, Par Value $0.0001 Per Share (133,745) 133,745 Direct
July 24, 2023 STEM Stock Option (Right to Buy)→ Common Stock, Par Value $0.0001 Per Share (95,187) 95,187 Direct
July 24, 2023 STEM Stock Option (Right to Buy)→ Common Stock, Par Value $0.0001 Per Share (83,735) 83,735 Direct
July 24, 2023 STEM Stock Option (Right to Buy)→ Common Stock, Par Value $0.0001 Per Share (9,249) 9,249 Direct