Updated Jul 16, 2026
Porter Stuart D has filed 3 SEC Form 4 filings across 3 companies in the last 90 days — buying. Lifetime open-market purchases: $1.50M. Historical track record: 4/5 stars across 4 tracked purchases.
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realised performance after each tracked open-market purchase.
| InsiderAlpha rating | ★★★★☆ (4/5) |
|---|---|
| Total purchases tracked | 4 |
| Purchases with forward-return data | 4 |
| 30-day win rate | 7500% |
| 90-day win rate | 7500% |
| Avg 5-day return | +1494.10% |
| Avg 30-day return | +3146.18% |
| Avg 90-day return | +1328.99% |
| Best 30-day return | +4558.30% |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-14 | GAME | GameSquare Holdings, Inc. | M — Option exercise | 150.0K | — | |
| 2026-06-01 | AIRJ | AirJoule Technologies Corp. | M — Option exercise | 28.0K | $0.00 | |
| 2026-06-01 | LIXT | LIXTE BIOTECHNOLOGY HOLDINGS, INC. | A — Grant or award | 25.0K | $0.00 | |
| 2026-01-20 | AIRJ | AirJoule Technologies Corp. | P — Open-market purchase | 153.8K | $3.25 | $500K |
| 2025-12-11 | AIRJ | AirJoule Technologies Corp. | P — Open-market purchase | 264.1K | $2.95 | $779K |
| 2025-12-11 | AIRJ | AirJoule Technologies Corp. | P — Open-market purchase | 46.8K | $2.84 | $133K |
| 2025-12-11 | AIRJ | AirJoule Technologies Corp. | P — Open-market purchase | 31.7K | $2.77 | $88K |
| 2025-12-09 | GAME | GameSquare Holdings, Inc. | M — Option exercise | 150.0K | — | |
| 2025-07-16 | CHX | ChampionX Corp | D — Derivative transaction | 26.1K | — | |
| 2025-07-16 | CHX | ChampionX Corp | A — Grant or award | 2.8K | $0.00 | |
| 2024-11-18 | CHX | ChampionX Corp | A — Grant or award | 4.1K | $0.00 |
Porter Stuart D is a corporate insider — currently tracked as Director of GameSquare Holdings, Inc. (GAME). InsiderAlpha tracks every SEC Form 4 filing in real time.
3 primary Form 4 filings in the last 90 days, covering 3 companies.
Recorded transactions: 4 open-market purchases ($1.50M) and 0 open-market sales () across all tracked filings.
Across 4 tracked purchases, Porter Stuart D averaged +3146.2% avg 30-day return with a 7500% 30-day win rate. InsiderAlpha rates the track record at 4/5 stars.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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