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Data sources

Public disclosures only. Scores flag unusual patterns and are not evidence of wrongdoing. Not investment advice.

RH CHAIN…
OverviewDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenMethodologyMatch reviewLaunch readiness
01Overview02Daily Brief03Live04Congress05Corporate Insiders06Government Money07Political Influence08Institutions09Washington Network10Follow the Power11Disclosure Clock12AI Investigator13Watchlist
ConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenMethodologyMatch reviewLaunch readiness
OverviewDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenMethodologyMatch reviewLaunch readiness
Data sources
SEC FORM 44h ago
HOUSE PTR4h ago
SEC 13F4h ago
ROBINHOOD CHAIN4h ago
Public company

AMPXAmprius Technologies, Inc.

CIK 0001899287

EDGAR filingsOpen in network
Disclosed transactions46
Buys / sells0 / 14
Max Insider Score42
Connections4with evidence

AMPX · disclosed activity on price

Disclosed transactions

ScoreActorSecuritySideValueExecutedDisclosedLagSourceEvidence
25
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$243K
23.5K sh
Aug 21, 2026Aug 25, 2026
traded Aug 21, 2026
+4dSEC FORM 4

Evidence

Verified connections

  • ← Lobbied forevidence
    STRATEGIC MARKETING INNOVATIONSLDA Q1 2026 first quarter · Defense, Energy · Aug 26, 2026
  • ← Insider ofevidence
    Rodriguez Ricardo C.Chief Financial Officer · Mar 6, 2026
  • ← Insider ofevidence
    Stepien Thomas MDirector, President · Dec 22, 2025
  • ← Insider ofevidence
    Stefan Constantin IonelChief Technology Officer · Nov 25, 2025
25
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL
$80K
8,000 sh
Aug 24, 2026
Aug 25, 2026
traded Aug 24, 2026
+1d
SEC FORM 4

Evidence

8
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
5,000 sh
Aug 25, 2026Aug 25, 2026
traded Aug 25, 2026
+0dSEC FORM 4

Evidence

8
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
5,000 sh
Aug 25, 2026Aug 25, 2026
traded Aug 25, 2026
+0dSEC FORM 4

Evidence

8
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
5,000 sh
Aug 25, 2026Aug 25, 2026
traded Aug 25, 2026
+0dSEC FORM 4

Evidence

25
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$307K
29.7K sh
Aug 21, 2026Aug 25, 2026
traded Aug 21, 2026
+4dSEC FORM 4

Evidence

8
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
346 sh
Aug 25, 2026Aug 25, 2026
traded Aug 25, 2026
+0dSEC FORM 4

Evidence

5
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Grant or award
A—
346 sh
Aug 25, 2026Aug 25, 2026
traded Aug 25, 2026
+0dSEC FORM 4

Evidence

12
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
36.9K sh
Jun 4, 2026Jun 5, 2026
traded Jun 4, 2026
+1dSEC FORM 4

Evidence

8
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
30.4K sh
Jun 4, 2026Jun 5, 2026
traded Jun 4, 2026
+1dSEC FORM 4

Evidence

22
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$42K
2,000 sh
Jun 4, 2026Jun 5, 2026
traded Jun 4, 2026
+1dSEC FORM 4

Evidence

8
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Gift
G—
36.9K sh
Jun 4, 2026Jun 5, 2026
traded Jun 4, 2026
+1dSEC FORM 4

Evidence

22
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$55K
3,208 sh
May 27, 2026May 28, 2026
traded May 27, 2026
+1dSEC FORM 4

Evidence

25
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$75K
4,375 sh
May 27, 2026May 28, 2026
traded May 27, 2026
+1dSEC FORM 4

Evidence

42
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$898K
60.7K sh
May 21, 2026May 26, 2026
traded May 21, 2026
+5dSEC FORM 4

Evidence

31
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$426K
28.8K sh
May 21, 2026May 26, 2026
traded May 21, 2026
+5dSEC FORM 4

Evidence

6
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Grant or award
A—
110.0K sh
Mar 4, 2026Mar 6, 2026
traded Mar 4, 2026
+2dSEC FORM 4

Evidence

17
SM
Stepien Thomas MDirector, Chief Executive Officer
AMPXAmprius Technologies, Inc.
Grant or award
A—
150.0K sh
Mar 4, 2026Mar 6, 2026
traded Mar 4, 2026
+2dSEC FORM 4

Evidence

21
RC
Rodriguez Ricardo C.Chief Financial Officer
AMPXAmprius Technologies, Inc.
Grant or award
A—
150.0K sh
Mar 4, 2026Mar 6, 2026
traded Mar 4, 2026
+2dSEC FORM 4

Evidence

27
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$476K
39.7K sh
Jan 28, 2026Jan 30, 2026
traded Jan 28, 2026
+2dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$1,980
39.6K sh
Jan 28, 2026Jan 30, 2026
traded Jan 28, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$55.8
90 sh
Jan 28, 2026Jan 30, 2026
traded Jan 28, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
90 sh
Jan 28, 2026Jan 30, 2026
traded Jan 28, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
39.6K sh
Jan 28, 2026Jan 30, 2026
traded Jan 28, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
1,600 sh
Jan 23, 2026Jan 23, 2026
traded Jan 23, 2026
+0dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
41.6K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

17
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$19K
1,600 sh
Jan 23, 2026Jan 23, 2026
traded Jan 23, 2026
+0dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$80
1,600 sh
Jan 23, 2026Jan 23, 2026
traded Jan 23, 2026
+0dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
15.8K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
15.9K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
253.9K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
72.8K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
166.1K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

27
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$879K
73.3K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$26K
41.6K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$792
15.8K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

5
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$794
15.9K sh
Jan 21, 2026Jan 23, 2026
traded Jan 21, 2026
+2dSEC FORM 4

Evidence

13
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$13K
253.9K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$33K
72.8K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$8,305
166.1K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

34
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$5.93M
492.8K sh
Jan 22, 2026Jan 23, 2026
traded Jan 22, 2026
+1dSEC FORM 4

Evidence

17
SM
Stepien Thomas MDirector, President
AMPXAmprius Technologies, Inc.
Grant or award
A—
200.0K sh
Dec 19, 2025Dec 22, 2025
traded Dec 19, 2025
+3dSEC FORM 4

Evidence

17
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M—
125.0K sh
Dec 11, 2025Dec 15, 2025
traded Dec 11, 2025
+4dSEC FORM 4

Evidence

34
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$2.08M
198.3K sh
Dec 11, 2025Dec 15, 2025
traded Dec 11, 2025
+4dSEC FORM 4

Evidence

9
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Option exercise
M$6,250
125.0K sh
Dec 11, 2025Dec 15, 2025
traded Dec 11, 2025
+4dSEC FORM 4

Evidence

27
SI
Stefan Constantin IonelChief Technology Officer
AMPXAmprius Technologies, Inc.
Open-market sale
SELL$252K
25.0K sh
Nov 21, 2025Nov 25, 2025
traded Nov 21, 2025
+4dSEC FORM 4

Evidence

Lobbying

$120K reported · de-duplicated
2026 Q2 $60K via firms2026 Q1 $60K via firms
  • STRATEGIC MARKETING INNOVATIONS$60K2026 Q2 · posted Aug 26, 2026 · Energy, Defense
  • STRATEGIC MARKETING INNOVATIONS$60K2026 Q1 · posted Aug 26, 2026 · Defense, Energy

Connected PAC contributions

FEC · direct to members

No contributions from a PAC connected to this company.