Updated Jul 16, 2026
Gross Mario has filed 1 SEC Form 4 filing across 1 company in the last 90 days — buying. Lifetime open-market purchases: $880K. Historical track record: 5/5 stars across 5 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 | ★★★★★ (5/5) |
|---|---|
| Total purchases tracked | 5 |
| Purchases with forward-return data | 5 |
| 30-day win rate | 10000% |
| 90-day win rate | 4000% |
| Avg 5-day return | +189.07% |
| Avg 30-day return | +987.70% |
| Avg 90-day return | -158.95% |
| Best 30-day return | +1552.34% |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-21 | AMRZ | Amrize Ltd | P — Open-market purchase | 1.2K | $48.63 | $58K |
| 2026-05-21 | AMRZ | Amrize Ltd | P — Open-market purchase | 1.0K | $48.63 | $49K |
| 2026-05-21 | AMRZ | Amrize Ltd | P — Open-market purchase | 1.8K | $49.47 | $89K |
| 2026-03-16 | AMRZ | Amrize Ltd | P — Open-market purchase | 1.2K | $55.13 | $66K |
| 2026-03-16 | AMRZ | Amrize Ltd | P — Open-market purchase | 2.0K | $55.39 | $111K |
| 2026-03-03 | AMRZ | Amrize Ltd | A — Grant or award | 4.3K | $0.00 | |
| 2025-08-13 | AMRZ | Amrize Ltd | P — Open-market purchase | 3.0K | $49.63 | $149K |
| 2025-08-08 | AMRZ | Amrize Ltd | P — Open-market purchase | 2.6K | $47.75 | $124K |
| 2025-08-08 | AMRZ | Amrize Ltd | P — Open-market purchase | 5.0K | $46.78 | $234K |
Gross Mario is a corporate insider — currently tracked as Chief Supply Chain Officer of Amrize Ltd (AMRZ). InsiderAlpha tracks every SEC Form 4 filing in real time.
1 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 8 open-market purchases ($880K) and 0 open-market sales () across all tracked filings.
Across 5 tracked purchases, Gross Mario averaged +987.7% avg 30-day return with a 10000% 30-day win rate. InsiderAlpha rates the track record at 5/5 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.
Open the live Gross Mario profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.