Mark N. Tompkins
Activist investor & 5%+ owner · SC 13D/13G filings
Total Filings
27
Stocks Covered
4
Latest Filing
Feb 17, 2026
Filings
Var Acquisition Corp.
SC 13G · Nov 14, 2025
75.0%
7.5M shares
Orielle Acquisition Corp.
SC 13G · Nov 14, 2025
95.0%
4.8M shares
Los Altos Ventures Corp.
SC 13G · Nov 14, 2025
75.0%
7.5M shares
Deep Isolation Nuclear, Inc.
SC 13G/A · Nov 14, 2025
4.0%
2.3M shares
Deep Fission, Inc.
SC 13G/A · Nov 14, 2025
5.8%
3.0M shares
Lomond Therapeutics Holdings, Inc.
SC 13G/A · Feb 14, 2025
4.0%
1.2M shares
Guerrilla RF, Inc.
SC 13G/A · Aug 14, 2024
4.2%
427K shares
SmartKem, Inc.
SC 13G/A · Feb 14, 2024
4.7%
64K shares
Guerrilla RF, Inc.
SC 13G/A · Feb 14, 2024
5.4%
427K shares
SmartKem, Inc.
SC 13G/A · Feb 14, 2023
8.5%
2.3M shares
Aeluma, Inc.
SC 13G/A · Feb 14, 2023
24.0%
2.7M shares
Guerrilla RF, Inc.
SC 13G/A · Feb 14, 2023
7.9%
3.0M shares
Venetian-1 Acquisition Corp.
SC 13G · Feb 10, 2023
95.0%
4.8M shares
Surfside Acquisition Inc.
SC 13G · Feb 10, 2023
95.0%
4.8M shares
Aspen-1 Acquisition Inc.
SC 13G · Feb 10, 2023
95.0%
4.8M shares
SmartKem, Inc.
SC 13G/A · Feb 14, 2022
9.0%
2.3M shares
Aeluma, Inc.
SC 13G/A · Feb 14, 2022
24.7%
2.6M shares
Patricia Acquisition Corp.
SC 13G · Feb 14, 2022
95.0%
4.8M shares