American Superconductor Corp /De/ (AMSC)Oberweis Asset Management Inc added to its stake +138K shares

988K

Shares reported · +138K vs prior quarter

0.85%

Disclosed portfolio weight

$41M

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. Jul 31, 2026Company filing · Form 8-K · Results, Shareholder voteReported its results, and held a shareholder vote

What came next

1. Sep 17, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“On September 17, 2026, Barbara G. Littlefield informed the Board of Directors (the “ Board ”) of American Superconductor Corporation of her resignation from the Board, effective at 12 p.m. eastern time on Friday, September 18, 2026.”

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 American Superconductor Corp /De/

For American Superconductor Corp /De/, OQRO holds 1 fund holdings report (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 AMSC page.

How this filing works

• SEC Form 13F

Other disclosures at American Superconductor Corp /De/

• SEC Form 13F-HRMay 18, 2026
• SEC Form 13F-HRMay 15, 2026
• SEC Form 13F-HRFeb 17, 2026
• SEC Form 13F-HRFeb 17, 2026
• SEC Form 13F-HRFeb 17, 2026
• SEC Form 13F-HRNov 14, 2025

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