# Portolan Capital Management, LLC > Portolan Capital Management, LLC is an SEC-registered investment advisory firm in Boston, MA, registered since 2012, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated April 15, 2026. - CRD: 157542 - Filed as: PORTOLAN CAPITAL MANAGEMENT, LLC - Registration: SEC-registered investment adviser (status as filed: Approved) - Location: Boston, MA - Filing period: October 2026 - Form ADV filing dated: April 15, 2026 - SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/157542 - AdvisorCensus page: https://advisorcensus.com/firm/portolan-capital-management-llc-boston-ma-157542 ## Quick answers **How is Portolan Capital Management, LLC compensated?** On its Form ADV (Item 5.E, October 2026), Portolan Capital Management, LLC reports these compensation arrangements: a percentage of assets under its management; performance-based fees. **Where is Portolan Capital Management, LLC located?** Portolan Capital Management, LLC's principal office is in Boston, MA, according to its Form ADV. **Is Portolan Capital Management, LLC registered with the SEC or a state?** Portolan Capital Management, LLC is an SEC-registered investment advisory firm, registered since 2012. Status as filed: Approved. CRD 157542. **How much does Portolan Capital Management, LLC manage?** Portolan Capital Management, LLC reports $2,021,361,155 in regulatory assets under management in its Form ADV filing dated April 15, 2026 (100% discretionary). **How have Portolan Capital Management, LLC's assets and staff changed since 2021?** In the Form ADV data for Portolan Capital Management, LLC: Regulatory assets under management: $1,224,603,076 in the October 2021 data and $2,021,361,155 in the October 2026 data, up 65%. Total employees: 11 in October 2021 and 12 in October 2026. Assets under management move with markets as well as with clients coming and going. **What types of clients does Portolan Capital Management, LLC serve?** By number of clients on Form ADV Item 5.D: high net worth individuals (14); pooled investment vehicles (other than investment companies and business development companies) (4); investment companies (1). **Which custodians does Portolan Capital Management, LLC use?** Portolan Capital Management, LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Fidelity Brokerage Services LLC and The Bank of New York Mellon as custodians holding 10% or more of its separately managed account assets. **Does Portolan Capital Management, LLC report any disciplinary disclosures?** Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/157542 **What changed in Portolan Capital Management, LLC's recent Form ADV filings?** In the April 2026 filing data: Regulatory assets under management went from $1,581,996,022 to $2,021,361,155 (+28%). ## From the Form ADV filing ### Compensation (Item 5.E) - A percentage of assets under your management - Performance-based fees ### Custodians (Schedule D, Section 5.K(3)) - Fidelity Brokerage Services LLC - The Bank of New York Mellon Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian. ### Regulatory assets under management (Item 5.F) - Total: $2,021,361,155 - Discretionary: $2,021,361,155 - Non-discretionary: $0 ### Clients (Item 5.D) | Client type | Clients | Assets | | --- | --- | --- | | Individuals (other than high net worth individuals) | 0 | $0 | | High net worth individuals | 14 | $267,060,525 | | Banking or thrift institutions | 0 | $0 | | Investment companies | 1 | $1,047,307,339 | | Business development companies | 0 | $0 | | Pooled investment vehicles (other than investment companies and business development companies) | 4 | $596,990,601 | | Pension and profit sharing plans (but not the plan participants or government pension plans) | 0 | $0 | | Charitable organizations | Fewer than 5 | $110,002,690 | | State or municipal government entities (including government pension plans) | 0 | $0 | | Other investment advisers | 0 | $0 | | Insurance companies | 0 | $0 | | Sovereign wealth funds and foreign official institutions | 0 | $0 | | Corporations or other businesses not listed above | 0 | $0 | | Other | 0 | $0 | ### Advisory services (Item 5.G) - Portfolio management for individuals and/or small businesses - Portfolio management for investment companies (and business development companies) - Portfolio management for pooled investment vehicles (other than investment companies) - Portfolio management for businesses (other than small businesses) or institutional clients ### Firm details - Registered since: 2012 (14 years) - Employees: 12 total, 4 performing advisory functions - Wrap fee program participation: No - States registered or notice-filed: FL, MA - Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11. ### Websites listed on Form ADV (Item 1.I) - portolan.com - LinkedIn @portolan-capital-management ## Assets and staff over time | Data period | Regulatory assets under management | Employees | Filing dated | | --- | --- | --- | --- | | October 2021 | $1,224,603,076 | 11 | May 4, 2021 | | October 2022 | $1,560,232,109 | 11 | March 28, 2022 | | October 2023 | $1,062,967,193 | 12 | March 31, 2023 | | October 2024 | $1,218,037,689 | 13 | March 28, 2024 | | October 2025 | $1,581,996,022 | 12 | March 31, 2025 | | October 2026 | $2,021,361,155 | 12 | April 15, 2026 | Regulatory assets under management: $1,224,603,076 in the October 2021 data and $2,021,361,155 in the October 2026 data, up 65%. Total employees: 11 in October 2021 and 12 in October 2026. ## Changes in the filing (last 12 months) ### April 2026 - Regulatory assets under management went from $1,581,996,022 to $2,021,361,155 (+28%). ## Source Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Portolan Capital Management, LLC (CRD 157542): Form ADV filing data as of October 2026.