AMPX CLUSTER SEC Filing Analysis

Latest settled — T+5d ⚠ clustered

AMPX ▲ +33.51% at T+5d

NEUTRAL call ✓ call won +33.51% · α vs SPY +32.30% · entry $17.16 → $22.91

Next anchor: T+20d in 14d

Last close $18.83 (close Jun 8) · +9.73% from $17.16 entry

Entry anchored
May 26, 03:59 PM ET
via Databento tick

T+1d

+21.50%

call +21.50% · α +20.96%

$20.85

settled 14d ago

T+5d

+33.51%

call +33.51% · α +32.30%

$22.91

settled 8d ago

T+20d

—

call — · α —

—

in 14d

T+60d

—

call — · α —

—

in 2mo

Price Chart

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Executive Summary

CEO and CTO of Amprius Technologies sold a combined $1.32M in open-market sales on May 21, 2026, at ~$14.79/share. The CEO's $898K sale and CTO's $426K sale represent ~0.06% of the $2.3B market cap, a trivial amount that falls well below the 0.1% materiality threshold. This is a routine liquidity-driven cluster with no bearish signal.

Key Financial Metrics

Direction

selling

Total Value

$1.3M

Insiders

2

Actionable Insight

The dollar amount is trivial relative to market cap, and both sales occurred on the same day at the same price, consistent with a shared blackout-window opening or 10b5-1 plan. Per academic literature, cluster sales are not informative signals. No action warranted.

Key Facts

CEO Stepien Thomas M sold 60,702 shares for $897,685 on May 21, 2026
CTO Stefan Constantin Ionel sold 28,812 shares for $426,083 on May 21, 2026
Total insider sales of $1.32M represent ~0.06% of AMPX's $2.3B market cap
Both sales were open-market transactions at $14.7884/share
No insider purchases were reported in the cluster window

Financial Impact

Total insider sales of $1.32M, representing 0.06% of market cap — immaterial relative to company size

insider holdings

Risk Factors

No material risk identified from this cluster given the small dollar value relative to market cap

Market Snapshot

Exchange

NYSE

Sector

Miscellaneous Electrical Machinery, Equipment & Supplies

Analyst Consensus

93% bullish (15 analysts)

Documents Analyzed

This report is based on 1 SEC document filed with EDGAR.

Document	Accession Number
CLUSTER Data (Synthetic)	cluster-AMPX-1779837050306

7 reports for AMPX

T+1T+5T+20T+60

50% Hit rate 3 of 6 directional calls best @ T+60▲ +46.07%Mar 4, 2026

Filters

Reports for AMPX — sortable, filterable
	Type				Now
May 28, 2026 12d ago	Insider Cluster BEARISH ★ 5/10	$20.28 $21.74	▼ −7.20%	▼ −7.49%	$18.83 (+7.15%)
May 28, 2026 12d ago	Insider Cluster BEARISH ★ 5/10	$20.28 $19.69	▲ +2.91%	▲ +0.39%	$18.83 (+7.15%)
May 26, 2026 14d ago	Insider Cluster BEARISH ★ 5/10	$17.16 $22.91	▼ −33.51%	▼ −32.30%	$18.83 (−9.73%)
May 26, 2026 14d ago	Insider Cluster NEUTRAL ★ 2/10	$17.16 $22.91	▲ +33.51%	▲ +32.30%	$18.83 (+9.73%)
Mar 12, 2026 12w ago	Insider Cluster BEARISH ★ 7/10	$18.29 $19.11	▼ −4.48%	▼ −5.46%	$18.83 (−2.95%)
Mar 4, 2026 13w ago	8-K BULLISH ★ 8/10	$14.89 $18.29	▲ +22.83%	▲ +25.07%	$18.83 (+26.46%)
Feb 23, 2026 15w ago	Insider Cluster BEARISH ★ 6/10	$10.20 $11.59	▼ −13.63%	▼ −13.01%	$18.83 (−84.61%)

US Market Status

Market Closed — Opens in 7h 27m

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