Promethium Advisors,llc

SEC CIK: 0002034073
Latest filing: Aug 5, 2026

SEC filings (opens in a new tab)

AMSC holding history

American Superconductor Corp in every 13F filed by Promethium Advisors,llc, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

AMSC overview All 13F holders of AMSC Full Q2 2026 holdings

Shares (Q2 2026): 5,000
Value: $207.6K
% of portfolio: 0.1%
Quarters held: 3; Since Q2 2025

Holdings of AMSC by Promethium Advisors,llc, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	5,000	$207.6K	0.1%	+5,000	New	Holders
Q4 2025	0	$0	0.0%	−5,500−100.0%	Sold out	Holders
Q3 2025	5,500	$326.6K	0.2%	00.0%	Unchanged	Holders
Q2 2025	5,500	$201.8K	0.1%	+5,500	New	Holders