Amprius Technologies (AMPX)Driehaus Capital Management LLC reduced its stake -2.45M shares

1.35M

Shares reported · -2.45M vs prior quarter

0.11%

Disclosed portfolio weight

$18.6M

Reported value

Holdings as of

Jun 30, 2026

Filed

Aug 14, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Aug 4, 2026Company filing · Form 8-K · ResultsReported its results
2. Aug 7, 2026Company filing · Form 8-K · Material agreement, New debtSigned an important agreement, and took on new debt or obligations

What came next

1. Sep 23, 2026Company filing · Form 8-K · Material agreementSigned an important agreement

How to read SEC Form 13F-HR

Form 13F is the quarterly report in which investment managers that oversee $100 million or more list the US-listed stocks and some other securities they held on the last day of the quarter.

Full guide: What is an SEC Form 13F?

What else is on file for Amprius Technologies

For Amprius Technologies, OQRO holds 3 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its AMPX page.

How this filing works

• SEC Form 13F

Other disclosures at Amprius Technologies

• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRMay 15, 2026
• SEC Form 13F-HRMay 15, 2026
• SEC Form 4Aug 26, 2025
• SEC Form 4Aug 26, 2025

Everything OQRO holds on this company is on its AMPX page.