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Portolan Capital Management, LLC

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

Total Filings

70

Stocks Covered

38

Latest Filing

Feb 26, 2026

Filings

Open Lending Corp

SC 13G · Feb 26, 2026

5.9%

7.0M shares

Forrester Research, Inc.

SC 13G · Feb 19, 2026

6.1%

1.2M shares

The Honest Company, Inc.

SC 13G/A · Feb 17, 2026

4.3%

4.8M shares

Mama's Creations, Inc.

SC 13G/A · Feb 17, 2026

3.1%

1.2M shares

DOMO, INC.

SC 13G/A · Feb 17, 2026

5.6%

2.2M shares

Canada Goose Holdings Inc.

SC 13G · Jan 16, 2026

6.3%

2.9M shares

Real Brokerage Inc

SC 13G · Jan 8, 2026

5.4%

11.3M shares

DOMO, INC.

SC 13G/A · Nov 13, 2025

7.1%

2.7M shares

Vishay Precision Group, Inc.

SC 13G/A · Nov 13, 2025

6.7%

823K shares

DOMO, INC.

SC 13G · Sep 17, 2025

6.0%

2.3M shares

Quanterix Corp

SC 13G/A · Aug 13, 2025

9.4%

3.6M shares

Vishay Precision Group, Inc.

SC 13G/A · Aug 13, 2025

8.1%

990K shares

Potbelly Corp

SC 13G · Jun 27, 2025

5.5%

1.7M shares

Quanterix Corp

SC 13G/A · May 15, 2025

7.6%

3.0M shares

GEN Restaurant Group, Inc.

SC 13G/A · May 15, 2025

0.0%

0 shares

Sportsman's Warehouse Holdings, Inc.

SC 13G/A · May 15, 2025

0.6%

237K shares

Castle Biosciences, Inc.

SC 13G · Apr 14, 2025

5.7%

1.6M shares

Mama's Creations, Inc.

SC 13G · Apr 11, 2025

5.2%

2.0M shares

Orion Group Holdings, Inc.

SC 13G/A · Feb 13, 2025

1.1%

449K shares

GEN Restaurant Group, Inc.

SC 13G/A · Feb 13, 2025

5.8%

284K shares

Honest Company, Inc.

SC 13G/A · Feb 13, 2025

5.3%

5.4M shares

Vishay Precision Group, Inc.

SC 13G · Feb 6, 2025

6.3%

771K shares

GEN Restaurant Group, Inc.

SC 13G/A · Nov 13, 2024

7.7%

373K shares

Quanterix Corporation

SC 13G/A · Nov 13, 2024

6.6%

2.5M shares

Identiv, Inc.

SC 13G/A · Nov 13, 2024

4.3%

1.0M shares

S portsman’s Warehouse Holdings, Inc.

SC 13G · Nov 6, 2024

5.2%

2.0M shares

Orion Group Holdings, Inc.

SC 13G · Jul 22, 2024

5.5%

1.8M shares

Quanterix Corporation

SC 13G · Jun 27, 2024

5.0%

1.9M shares

Identiv, Inc.

SC 13G · Mar 14, 2024

5.5%

1.3M shares

Kura Sushi USA, Inc.

SC 13G/A · Feb 14, 2024

0.7%

75K shares

Identiv, Inc.

SC 13G/A · Feb 14, 2024

3.9%

907K shares

Porch Group, Inc.

SC 13G/A · Feb 14, 2024

3.2%

3.2M shares

The Honest Company, Inc.

SC 13G/A · Feb 14, 2024

7.9%

7.6M shares

EMCORE Corporation

SC 13G/A · Feb 14, 2024

0.0%

0 shares

Bel Fuse Inc.

SC 13G/A · Feb 14, 2024

1.8%

191K shares

GEN Restaurant Group, Inc.

SC 13G · Dec 18, 2023

6.7%

276K shares

The Honest Company, Inc.

SC 13G · Apr 13, 2023

5.6%

5.2M shares

EMCORE Corporation

SC 13G · Mar 24, 2023

5.8%

3.1M shares

Bel Fuse Inc.

SC 13G · Mar 10, 2023

5.1%

532K shares

Identiv, Inc.

SC 13G/A · Feb 13, 2023

9.4%

2.1M shares

Alta Equipment Group Inc.

SC 13G/A · Feb 13, 2023

1.8%

572K shares

Richardson Electronics, Ltd.

SC 13G/A · Feb 13, 2023

4.0%

485K shares

Full House Resorts, Inc .

SC 13G/A · Feb 13, 2023

1.2%

407K shares

Lantronix, Inc.

SC 13G/A · Feb 13, 2023

1.9%

691K shares

Porch Group, Inc.

SC 13G/A · Feb 13, 2023

6.3%

6.3M shares

Harvard Bioscience, Inc.

SC 13G/A · Feb 13, 2023

2.5%

1.1M shares

N/A

Charah Solutions, Inc.

SC 13G/A · Feb 13, 2023

5.0%

167K shares

Kura Sushi USA, Inc.

SC 13G · Jan 20, 2023

5.3%

470K shares

Porch Group, Inc.

SC 13G · Dec 5, 2022

5.9%

5.9M shares

Charah Solutions, Inc.

SC 13G/A · Nov 22, 2022

5.3%

1.8M shares