Castine Capital Management, LLC (Boston)


Castine Capital Management, LLC is a large advisory firm based in Boston. It manages $523.09 million of regulatory assets for 2 client accounts. It has been registered with the SEC as an adviser since 2012 and has operated in the jurisdiction of Massachusetts.

Castine Capital Management provides portfolio management for pooled investment vehicles. It doesn't provide financial planning services to its clients. On top of advisory services, the firm doesn't engage in other business activities.

Castine Capital Management: assets under management

The assets under management (AUM) of Castine Capital Management, LLC is $523.09 million, all of which is managed in discretionary accounts. The firm's AUM has grown by 24% since the beginning of its operation, and $195.78 million of the total AUM is attributable to clients outside of the United States.


The firm manages $523.09 million in discretionary accounts. On average, the discretionary accounts where all decisions are made on behalf of the client hold $261.54 million each.
Castine Capital Management has custody of $523.09 million in cash and securities for 2 clients in total but doesn’t act as a qualified custodian.

Fees & Commissions

The advisory firm has a single stream of revenue. Clients pay Castine Capital Management, LLC for their services and products based on a percentage of assets under management. Compensation based on assets under management promotes a long-term relationship between a client and the adviser and helps align mutual interests. These fees don’t include brokerage commissions, interest, taxes, and other account expenses.

What kind of clients Castine Capital Management serves?

The only and largest group of clients of Castine Capital Management is pooled investment vehicles with 2 clients and $523.09 million of assets under management. Among the 11 most similar advisory firms, Castine Capital Management has the 2nd highest percentage of pooled investment vehicles out of all clients.


The amount of regulatory assets under management is $523.09 million for 2 clients. 50% of the firm’s clients are foreign persons or businesses.

Castine Capital Management also advises several private funds. Namely, two hedge funds. The minimum investment commitment required of non-related persons is $500,000 for each fund.

Careers at Castine Capital Management, LLC

The company employs 4 people that are either part- or full-time employees. 75 percent of the employees work as investment advisers or researchers. No employees are registered as investment adviser representatives with the state securities authorities.

There isn’t anyone with the role of looking for and bringing in new clients on behalf of the firm. The firm doesn’t compensate employees in addition to the salary for bringing in new clients. Employees don’t receive compensation from other entities for client referrals.

Direct owners and executive officers



Name Entity Date acquired Ownership Employer ID
Ostrom Enders Member, chief operating officer & chief compliance officer 1 Apr 2003 Other 2550416
Paul David Magidson Managing member 1 Apr 2003 50% - 75% 6024128
Jonathan Zubrow Cohen Member 1 Apr 2003 Other 4874035

Based in Boston

The principal office where Castine Capital Management, LLC performs its advisory services is located at One Financial Center, Boston, MA 02111, which is also the mailing address of the firm. It doesn’t run an office outside of the United States.

You can reach the main office by calling the phone number 617-310-5190 or by fax 617-310-5189. The normal business hours are 9-5 on Monday - Friday.