# Gagnon Securities, LLC

> Gagnon Securities, LLC is an SEC-registered investment advisory firm in New York, NY, registered since 2005, reporting $500 million to $1 billion in regulatory assets under management in its Form ADV filing dated August 12, 2026.

- CRD: 103727
- Filed as: GAGNON SECURITIES, LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: New York, NY
- Filing period: October 2026
- Form ADV filing dated: August 12, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/103727
- AdvisorCensus page: https://advisorcensus.com/firm/gagnon-securities-llc-new-york-ny-103727

## Quick answers

**How is Gagnon Securities, LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Gagnon Securities, LLC reports these compensation arrangements: a percentage of assets under its management; commissions. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Gagnon Securities, LLC located?**
Gagnon Securities, LLC's principal office is in New York, NY, according to its Form ADV.

**Is Gagnon Securities, LLC registered with the SEC or a state?**
Gagnon Securities, LLC is an SEC-registered investment advisory firm, registered since 2005. Status as filed: Approved. CRD 103727.

**How much does Gagnon Securities, LLC manage?**
Gagnon Securities, LLC reports $529,713,650 in regulatory assets under management in its Form ADV filing dated August 12, 2026 (100% discretionary).

**How have Gagnon Securities, LLC's assets and staff changed since 2021?**
In the Form ADV data for Gagnon Securities, LLC: Regulatory assets under management: $784,631,376 in the October 2021 data and $529,713,650 in the October 2026 data, down 32%. Total employees: 23 in October 2021 and 19 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Gagnon Securities, LLC serve?**
By number of clients on Form ADV Item 5.D: individuals (other than high net worth individuals) (1,025); corporations or other businesses not listed above (144); high net worth individuals (33).

**Which custodians does Gagnon Securities, LLC use?**
Gagnon Securities, LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists National Financial Services LLC as a custodian holding 10% or more of its separately managed account assets.

**Does Gagnon Securities, LLC report any disciplinary disclosures?**
Reports 3 disclosure items on Form ADV Item 11: yes answers to 11.C(2) (SEC or CFTC finding of a violation), 11.C(4) (SEC or CFTC order), and 11.C(5) (SEC or CFTC civil money penalty or cease-and-desist order). Each question covers the firm and its advisory affiliates, and one event can produce several yes answers. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/103727

**What changed in Gagnon Securities, LLC's recent Form ADV filings?**
In the March 2026 filing data: Registered or notice-filed in KS, SD. Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Commissions

### Custodians (Schedule D, Section 5.K(3))
- National Financial Services LLC

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: $529,713,650
- Discretionary: $529,713,650
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 1,025 | $247,565,175 |
| High net worth individuals | 33 | $224,168,211 |
| Corporations or other businesses not listed above | 144 | $57,980,264 |

### Advisory services (Item 5.G)
- Portfolio management for individuals and/or small businesses

### Firm details
- Registered since: 2005 (20 years)
- Employees: 19 total, 10 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: AL, AR, AZ, CA, CO, CT, DC, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VI, VT, WA, WI, WY
- Disclosures (Item 11): Reports 3 disclosure items on Form ADV Item 11.

### Item 11 questions answered yes
- 11.C(2): Has the SEC or the CFTC ever found that the firm or an advisory affiliate was involved in a violation of SEC or CFTC regulations or statutes?
- 11.C(4): Has the SEC or the CFTC ever entered an order against the firm or an advisory affiliate in connection with investment-related activity?
- 11.C(5): Has the SEC or the CFTC ever imposed a civil money penalty on the firm or an advisory affiliate, or ordered the firm or an advisory affiliate to cease and desist from an activity?

Each question covers the firm and its advisory affiliates: its current employees other than clerical staff, its officers, partners, and directors, and anyone who controls the firm or is controlled by it. One event can produce yes answers to several questions. SEC-registered advisers and exempt reporting advisers may leave out events more than ten years old, and may answer 11.A(2) and 11.B(2) for pending charges only. The detail of each yes answer is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/103727

### Websites listed on Form ADV (Item 1.I)
- [gagnonsec.com](https://gagnonsec.com)
- LinkedIn @gagnon-securities

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $784,631,376 | 23 | August 6, 2021 |
| October 2022 | $710,114,755 | 23 | February 24, 2022 |
| October 2023 | $461,415,925 | 23 | May 24, 2023 |
| October 2024 | $437,985,074 | 22 | March 28, 2024 |
| October 2025 | $545,317,238 | 20 | June 3, 2025 |
| October 2026 | $529,713,650 | 19 | August 12, 2026 |

Regulatory assets under management: $784,631,376 in the October 2021 data and $529,713,650 in the October 2026 data, down 32%.
Total employees: 23 in October 2021 and 19 in October 2026.

## Changes in the filing (last 12 months)

### March 2026
- Registered or notice-filed in KS, SD.
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Gagnon Securities, LLC (CRD 103727): Form ADV filing data as of October 2026.