Gagnon Securities, LLC
Data sourced from SEC public records (and other sources when available). Refreshed weekly • Updated today.
Client AUMClient assets under management
$471,733,386
Clients
1,058
Advisors
19
of 19 employees
About
Gagnon Securities serves individual and institutional clients through discretionary portfolio management, retirement accounts, trusts and custodial arrangements, overseeing approximately $529.7 million in regulatory assets under management across a team of advisors and about 1,058 client relationships. The firm is dually registered as an SEC-registered investment adviser and a FINRA-member broker‑dealer and provides both advisory and brokerage services with clearing through National Financial Services (NFS).
The firm follows a research-intensive, generalist equity approach focused on stock-by-stock selection for capital appreciation with a long-term orientation, and it manages accounts on a discretionary basis under limited trading authorizations. Its platform permits more active strategies—including the use of margin and short positions in margin accounts and separately managed hedged accounts—so portfolio construction can include hedging and leveraging techniques alongside long-only exposures.
Gagnon Securities is notable among similarly sized team firms for operating as both adviser and broker‑dealer with transaction-based commissions and per‑share fees on non‑retirement accounts, maintaining affiliated investment vehicles and manager relationships (including domestic long/short funds and fund‑of‑funds structures), and participating in programs such as fully paid securities lending through its custodian. The firm discloses a prior SEC enforcement matter involving reporting violations, and its brochure emphasizes portfolio management as the primary service rather than comprehensive financial planning.
Client services
Expertise
Fee options
Maximum commission rate of 2% of the net trade amount per buy and sell transaction; up to $0.04 cents per share transaction fee
Account minimum: $15,000
Main office
1370 Avenue of the Americas
New York NY 10019
Advisors at this office
19
Most active in
Alabama · Arizona · Arkansas · California · Colorado · Connecticut · District of Columbia · Florida · Georgia · Idaho · Illinois · Indiana · Iowa · Kansas · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Mississippi · Missouri · Montana · Nebraska · Nevada · New Hampshire · New Jersey · New Mexico · New York · North Carolina · North Dakota · Ohio · Oklahoma · Oregon · Pennsylvania · Rhode Island · South Carolina · South Dakota · Tennessee · Texas · Utah · Vermont · Virgin Islands · Virginia · Washington · Wisconsin · Wyoming
Disclosures
Exclamation point means they have disclosures of this type. Check mark means no disclosures of this type were found.
Business activities & affiliations
Is active or affiliated with:
Broker-dealer / trader
They provide brokerage services and may earn transaction-based compensation in addition to advisory fees.
Fund sponsor
They manage or sponsor investment funds and may earn management or performance-based fees if clients invest in them.
Is not active or affiliated with:
-
Insurance agent
They sell insurance products and may earn commissions on those sales.
-
Bank
They're affiliated with a bank that may offer its own financial products and services.
-
Trust company
They provide trust and estate administration services, typically for separate fees.
-
Accountant / CPA / tax prep
They offer tax and accounting services, typically for separate fees.
-
Lawyer
They provide legal services, typically billed separately.
-
Real estate agent
They facilitate real estate transactions and may earn commissions.
-
Other specialized services
They may provide services such as pension consulting or municipal advisory work, typically for separate fees.
Quick links
Advisors at this firm
Not sure where to start?
We'll help you think it through—whether you ultimately need an advisor or not. Warmer helps you compare advisors clearly, so you can choose with confidence.
For advisor listings, we rely on sources including public filings and data provided by advisors, and we cannot guarantee that all information is current or accurate. Advisors are independent and may not have reviewed or updated this information. Please review an advisor’s Form ADV and do your own diligence before deciding whether to work with them.
Advisor matching and introductions are provided by FinanceHQ LLC (“FHQ”), a wholly-owned subsidiary of Warmer and an SEC-registered investment advisor. We receive compensation from certain participating advisors for introductions or referrals. This creates a conflict of interest because we have an incentive to recommend advisors who compensate us, including those who pay us more. You pay no fee to use our matching service, and advisor fees are not increased because of a referral or introduction. We do not review the ongoing performance of advisors, manage or hold assets, guarantee performance, or provide advice about specific investments.
By using our service, you agree to our Terms of Service and Advisory Agreement, and acknowledge our Privacy Policy. Please review FHQ’s ADV Part 2A and Form CRS. Logos provided by Logo.dev
© 2026 Warmer Holdings Inc. (“Warmer”)