AMPX Amprius Technologies, Inc.

NYSE
$9.10

Amprius Technologies, Inc. (AMPX) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with AMPX's own trailing one-year pace, with 0% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 3 sellers in the last 90 days
Insiders buying
0
0 transactions
Insiders selling
6
37 transactions
Purchases
$0
0 shares
Sales
$85.7M
6,372,615 shares
Net activity
-$85.7M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $85.7M 37 transactions · 6,372,615 shares

Largest single sale: $19.7M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

No open-market insider purchase on record.

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Stepien Thomas M Chief Executive Officer Sell 8,000 $10.03 $80.2K 594,096 −1.3% of holding
Sun Kang Director Sell 62,101 $10.34 $642.2K 1,218,397 −4.8% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 29,681 $10.34 $306.9K 771,629 −3.7% of holding
Stepien Thomas M Chief Executive Officer Sell 23,529 $10.34 $243.3K 602,096 −3.8% of holding
DIXON DONALD R Director Sell 85,000 $17.17 $1.5M 359,380 −19.1% of holding
DIXON DONALD R Director Sell 40,000 $19.13 $765.2K 444,380 −8.3% of holding
Stepien Thomas M Chief Executive Officer Sell 2,000 $20.97 $41.9K 625,625 −0.3% of holding
Stepien Thomas M Chief Executive Officer Sell 4,375 $17.19 $75.2K 694,923 −0.6% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 3,208 $17.19 $55.2K 801,310 −0.4% of holding
Sun Kang Director Sell 356 $17.19 $6.1K 1,280,498 −0% of holding
DIXON DONALD R Director Sell 17,895 $17.90 $320.3K 484,380 −3.6% of holding
Sun Kang Director Sell 67,796 $14.79 $1.0M 1,280,854 −5% of holding
Stepien Thomas M Chief Executive Officer Sell 60,702 $14.79 $897.7K 699,298 −8% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 28,812 $14.79 $426.1K 804,518 −3.5% of holding
Sun Kang 2 fills Director Sell 1,500,000 $15.91 $23.9M 1,591,437 −48.5% of holding
Sun Kang 2 fills Director Sell 217,869 $18.80 $4.1M 121,452 −64.2% of holding
HSIEH Wen Hsuan 2 fills Director Sell 413,146 $18.44 $7.6M 175,090 −70.2% of holding
Chu Steven 3 fills Director Sell 155,565 $18.50 $2.9M 182,904 −46% of holding
Chu Steven Director Sell 166,632 $17.92 $3.0M 127,339 −56.7% of holding
Sun Kang Director Sell 61,251 $10.16 $622.0K 1,342,400 −4.4% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 25,366 $10.16 $257.6K 723,330 −3.4% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 39,690 $12.00 $476.4K 748,696 −5% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 1,600 $12.00 $19.2K 748,696 −0.2% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 492,827 $12.04 $5.9M 748,696 −39.7% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 73,280 $12.00 $879.4K 748,696 −8.9% of holding
Sun Kang Director Sell 43,185 $11.03 $476.3K 1,403,651 −3% of holding
Sun Kang Director Sell 950,548 $11.07 $10.5M 1,403,651 −40.4% of holding
Sun Kang Director Sell 506,267 $10.10 $5.1M 1,403,651 −26.5% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 198,255 $10.51 $2.1M 748,696 −20.9% of holding
Sun Kang Chief Executive Officer Sell 68,655 $10.08 $692.1K 1,403,651 −4.7% of holding
Stefan Constantin Ionel Chief Technology Officer Sell 25,024 $10.08 $252.3K 821,951 −3% of holding
Sun Kang Chief Executive Officer Sell 1,000,000 $10.60 $10.6M 1,472,306 −40.4% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.