Stefan Constantin Ionel
Chief Technology Officer
Stefan Constantin Ionel has filed 9 SEC Form 4 filings (21 transaction rows) across 1 company, with disclosures dating back to 2025. 9 of those filings fall inside the rolling window. Most recent filing: Aug 25, 2026.
On the most recent filing, Stefan Constantin Ionel is listed as Chief Technology Officer at Amprius Technologies, Inc. Inside the rolling window, Stefan Constantin Ionel reported no open-market purchases and 10 open-market sales totaling $10.7M in AMPX. The largest disclosed transaction in the window is a sale of 492,827 AMPX shares on Jan 22, 2026, worth $5.9M.
Companies traded
Other insiders at AMPX
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$10.7M
reported sales (SEC code S)
Companies
1
in the rolling window
| Source | |||||||
|---|---|---|---|---|---|---|---|
| AMPX | Chief Technology Officer | Sale | 29,681 | $307K | Aug 25 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 3,208 | $55K | May 28 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 28,812 | $426K | May 26 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 25,366 | $258K | Feb 24 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 39,690 | $476K | Jan 30 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 73,280 | $879K | Jan 23 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 492,827 | $5.9M | Jan 23 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 1,600 | $19K | Jan 23 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 198,255 | $2.1M | Dec 15 | SEC ↗ | |
| AMPX | Chief Technology Officer | Sale | 25,024 | $252K | Nov 25 | SEC ↗ |
Frequently asked questions
How many SEC Form 4 filings has Stefan Constantin Ionel made?
Stefan Constantin Ionel has filed 9 SEC Form 4 filings (21 transaction rows) across 1 company since 2025.
Which companies does Stefan Constantin Ionel trade?
Stefan Constantin Ionel has filed SEC Form 4 disclosures for 1 company, including AMPX.
When was Stefan Constantin Ionel's most recent SEC Form 4 filing?
Stefan Constantin Ionel's most recent SEC Form 4 filing on Tracefour is dated Aug 25, 2026.
What is Stefan Constantin Ionel's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Stefan Constantin Ionel is listed as Chief Technology Officer.
What is Stefan Constantin Ionel's total buy and sell value in the current window?
Inside the rolling retention window, Stefan Constantin Ionel bought $0 and sold $10.7M based on SEC Form 4 filings.
What was Stefan Constantin Ionel's largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 492,827 AMPX shares on 2026-01-22, worth $5.9M, per SEC Form 4 filings.