ACK Asset Management LLC

Activist investor & 5%+ owner · SC 13D/13G filings

Total Filings

Stocks Covered

Latest Filing

Nov 18, 2025

Filings

ASTRONICS CORP

SC 13G/A · Nov 18, 2025

4.0%

1.2M shares

Clearfield, Inc.

SC 13G/A · May 13, 2025

4.9%

687K shares

CLEARFIELD, INC

SC 13G · Feb 14, 2025

5.0%

720K shares

Astronics Corporation

SC 13G · Dec 12, 2024

6.9%

2.1M shares

N/A

ALLIED MOTION TECHNOLOGIES INC

SC 13G · Feb 17, 2023

5.1%

807K shares

LUNA INNOVATIONS INC.

SC 13G · Feb 14, 2022

5.7%

1.8M shares