Stefan Constantin Ionel
Transaction history · last 12 months
7 transactionsTransaction codes: P open-market purchase · S sale · M option exercise · A grant.
Cluster context · Amprius Technologies, Inc.
last 30 daysNo active insider cluster at Amprius Technologies, Inc. in the last 30 days. Ionel's recent transactions appear in the section above.
Convergence · Pattern Engine ships in v1.1
30-day windowConvergence participation lands with the Pattern Engine.
Once the Pattern Engine ships, this section will list every active convergence event Ionel is named in — the hedge funds and Congress members on the same name, the 30-day window, and the combined position size.
Context
Form 4 backgroundForm 4 filings are required within two business days of any insider transaction by an officer, director, or 10%+ shareholder. Open-market purchases (transaction code P) are the most signal-rich because they indicate the insider is paying market price with personal cash — as distinct from option exercises, scheduled sales, or compensation grants. Cluster buying — three or more insiders of the same company buying open-market shares in a 30-day window — has historically been one of the strongest positive insider-trading signals in the academic literature.
Source data: SEC EDGAR · Form 4 filings · Last refreshed 16:22 UTC.