GAGNON SECURITIES LLC

Registered adviser

CIK

1125725

Location

New York, NY

Portfolio Value

Small $574,045,525

Diversification

Diversified

Filing Date

Global Rank

#3,816 / 8,827 ▲ 82 · as of Jun 2026

Top Industry

Diagnostics & Research 18.7%

Period ended 38 days ago

Filed Nov 5, 2026 · 2d

27 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Registered adviser

Form ADV roster, Nov 1, 2026

Form ADV adviser

CRD 103727

Roster of Nov 1, 2026

Regulatory AUM

$529,713,650

Main clients

Individuals and high net worth (89% of AUM)

Form ADV history

Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.

Rosters	Regulatory AUM	Main clients
Mar 2026 to Nov 2026	$529,713,650	Individuals and high net worth (89%)
Apr 2025 to Feb 2026	$545,317,238	Individuals and high net worth (89%)
Apr 2024 to Mar 2025	$437,985,074	Individuals and high net worth (90%)
May 2023 to Mar 2024	$461,415,925	Individuals and high net worth (90%)
Apr 2023	$461,415,925	Individuals and high net worth (90%)
Mar 2022 to Mar 2023	$710,114,755	Individuals and high net worth (90%)

5 earlier changes not shown.

Stated strategy

Fundamental active Form ADV Part 2A, May 4, 2026 · original

In the firm's words

Fundamental active: we take a research-intensive, generalist approach to evaluating investments.

Stated strategy

Fundamental active Form ADV Part 2A, May 4, 2026 · original

In the firm's words

Fundamental active: we take a research-intensive, generalist approach to evaluating investments.

Schedule 13D/13G stakes

Stakes of 5% or more disclosed on Schedule 13D or 13G, each on the filer's latest filing for the security. These are event-dated stakes, not the quarter-end 13F portfolio below.

Company	Schedule	Event date	Filed	Shares	% of class	Change	Status
CNF CNFinance Holdings Ltd.	13G/A	Sep 30, 2026	2d	126,893,600	8.1%	+33,592,600 since Dec 31, 2025	Current
AMRC Ameresco, Inc.	13G	Aug 20, 2026	2mo	1,762,866	5%	+45,522 since Sep 30, 2025	Current
KLTR Kaltura Inc	13G	Aug 5, 2026	3mo	8,869,949	5.8%	—	Current
OSUR Orasure Technologies Inc	13G	Jan 8, 2026	7mo	3,754,846	5.4%	+189,531 since Dec 31, 2025	Current
TMCI Treace Medical Concepts, Inc.	13G/A	Dec 31, 2025	9mo	6,142,107	9.6%	+2,162,653 since May 9, 2025	Current
PROF Profound Medical Corp.	13G/A	Dec 31, 2024	1y	3,346,743	11.2%	+441,337 since Sep 30, 2024	Current
PSIX Power Solutions International, Inc.	13G/A	Dec 31, 2024	1y	1,678,849	7.3%	—	Current

A 13D or 13G stays in force until its filer amends it and no amendment is due without a material change, so a stake with no filing in 24 months reads unconfirmed, never sold. An amendment reporting under 5% ends the filer's duty to amend, not necessarily the holding. Shares are restated onto today's split basis. Show 1 exited, below-5% or retired stake

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, the newest measured quarter, never from the firm's own description.

Style

Diversified active

Top 10 weight 49.0%, 26.2 effective positions, active share 97.7% against the Russell 2000 as of 2026-06-30; it meets none of the index-like, systematic-like or concentrated tests

Turnover

Medium turnover

34.6% over the last four quarters (30% to under 100%)

Horizon

Long horizon

Value-weighted holding period 20.8 quarters (12+), a floor since 58.7% of the book was already held when coverage starts

Closest benchmark: the Russell 2000 as of 2026-06-30, active share 97.7%; sector active share 46.0% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

View clone backtest

Portfolio Concentration

82 tracked positions · as of Sep 30, 2026 · Δ vs Jun 30, 2026

Top Position

12.2%

+2.2 pts

Top 5

31.1%

−0.2 pts

Top 10

47.5%

−1.5 pts

HHI

397

Diversified+15

Portfolio Trend

27 quarters · across all stocks

Sector Breakdown

As of Sep 30, 2026

Sector	% Portfolio	Value	Positions
Healthcare	47.8%	$274,262,218	24
Technology	17.1%	$98,063,721	23
Consumer Cyclical	9.4%	$53,924,981	9
Industrials	9.3%	$53,360,226	5
Energy	6.6%	$38,147,206	4
Real Estate	4.2%	$24,336,750	5
Communication Services	3.6%	$20,538,758	7
Basic Materials	1.6%	$9,022,600	2
Consumer Defensive	0.2%	$1,233,266	1
Financial Services	0.2%	$1,155,799	2

Last Quarter's Activity

Export CSV

Sep 30, 2026 vs Jun 30, 2026

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
KLTR	Kaltura Inc	+1,324,799	4,591,798	$5,877,501
TMCI	Treace Medical Concepts, Inc.	+386,375	3,415,918	$15,166,675
VERX	Vertex, Inc.	+284,161	1,045,187	$12,312,302
QDEL	QuidelOrtho Corp	+268,191	1,298,562	$13,686,843
OSUR	Orasure Technologies Inc	+234,457	1,826,604	$7,160,287
BL	Blackline, Inc.	+144,261	520,030	$13,796,395
PROF	Profound Medical Corp.	+90,513	2,050,587	$11,893,404
AMRC	Ameresco, Inc.	+69,865	896,427	$18,565,003
ASPN	Aspen Aerogels Inc	+22,062	1,557,874	$8,537,149
PCRX	Pacira BioSciences, Inc.	+16,188	624,805	$15,651,365
ELVA	Electrovaya Inc.	+6,523	32,830	$214,051
T	At&T Inc.	+4,343	35,241	$859,880
GNRC	Generac Holdings Inc.	+3,514	76,684	$15,869,753
WRBY	Warby Parker Inc.	+2,841	14,222	$395,087
PRLB	Proto Labs Inc	+2,088	118,371	$11,227,489
WCPRF	Whitecap Resources Inc.	+1,634	436,734	$5,398,119
CARG	CarGurus, Inc.	+1,500	368,573	$11,484,734
AKAM	Akamai Technologies Inc	+1,317	4,480	$476,448
GNTX	Gentex Corp	+1,258	58,417	$1,269,985
PFE	Pfizer Inc	+1,156	24,502	$698,797
CMG	Chipotle Mexican Grill Inc	+887	156,350	$4,995,382
KMX	Carmax Inc	+867	326,277	$17,981,125
SHOP	Shopify Inc.	+724	4,747	$703,980
VCEL	Vericel Corp	+536	7,839	$314,657
MCHP	Microchip Technology Inc	+348	26,577	$2,066,893
No positions match the current search.

Trimmed

Positions the filer reduced

24 positions

Ticker	Company	Δ Shares	Shares	Value
CDNA	CareDx, Inc.	−696,336	1,074,399	$69,835,935
FIVN	Five9, Inc.	−155,852	566,846	$19,278,432
HZO	Marinemax Inc	−108,296	103,184	$5,396,523
WEAV	Weave Communications, Inc.	−108,027	49,143	$362,675
DV	DoubleVerify Holdings, Inc.	−56,233	467,095	$6,301,111
AMPL	Amplitude, Inc.	−28,145	1,027,363	$14,228,977
CNF	CNFinance Holdings Ltd.	−26,733	305,612	$595,943
FLG	Flagstar Bank, National Association	−26,482	47,974	$559,856
GNL	Global Net Lease, Inc.	−12,543	148,055	$1,222,934
ENSG	Ensign Group, Inc	−10,569	163,342	$28,094,824
DOCU	Docusign, Inc.	−8,747	12,159	$816,476
WGS	GeneDx Holdings Corp.	−8,581	516,284	$37,327,333
APPS	Digital Turbine, Inc.	−7,356	74,483	$826,761
DVN	Devon Energy Corp	−7,265	11,756	$541,246
CAKE	Cheesecake Factory Inc	−5,906	215,886	$22,719,842
—		−3,809	532,097	$20,671,968
HNGE	Hinge Health, Inc.	−2,796	180,163	$17,519,050
CGNX	Cognex Corp	−2,502	7,296	$442,502
NCNO	nCino, Inc.	−1,838	73,495	$1,332,464
EPD	Enterprise Products Partners L.P.	−1,599	508,977	$18,124,670
FRSH	Freshworks Inc.	−1,205	1,562,661	$19,986,434
GOOG	Alphabet Inc.	−740	1,189	$405,139
EQIX	Equinix Inc	−270	16,450	$16,640,491
RNG	RingCentral, Inc.	−14	8,503	$635,174
No positions match the current search.

New Positions

Positions the filer opened this quarter

8 positions

Ticker	Company	Shares	Value
NVGS	Navigator Holdings Ltd.	607,557	$14,083,171
BKD	Brookdale Senior Living Inc.	739,175	$8,005,265
BV	BrightView Holdings, Inc.	748,393	$7,483,930
TGLS	Tecnoglass Holdings Inc.	13,667	$485,451
ABT	Abbott Laboratories	4,769	$471,320
AMT	American Tower Corp	2,776	$454,403
GRSD	GRANDSTAND Ltd	153,455	$231,717
PSKY	Skydance Corp	108,399	$0
No positions match the current search.

Sold Out

Positions the filer fully exited

5 positions

Ticker	Company	Shares	Value
TECH	BIO-TECHNE Corp	12,230	$864,049
PL	Planet Labs PBC	8,352	$276,701
RMBS	Rambus Inc	1,778	$236,011
BX	Blackstone Inc.	1,940	$228,279
PTEN	Patterson Uti Energy Inc	17,420	$159,915
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

82 tracked positions · $574,045,525 total · filing declares 84 positions · $576,506,861 · as of Sep 30, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Real Estate Technology

Showing 1–50 of 82 positions by value · page 1 of 2

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
CDNA	CareDx, Inc. Healthcare	Reduced	1,074,399	-696,336	$69,835,935	+38.4%	12.17%
WGS	GeneDx Holdings Corp. Healthcare	Reduced	516,284	-8,581	$37,327,333	+3.6%	6.50%
ENSG	Ensign Group, Inc Healthcare	Reduced	163,342	-10,569	$28,094,824	+0.8%	4.89%
CAKE	Cheesecake Factory Inc Consumer Cyclical	Reduced	215,886	-5,906	$22,719,842	+28.8%	3.96%
		Reduced	532,097	-3,809	$20,671,968	+36.6%	3.60%
FRSH	Freshworks Inc. Technology	Reduced	1,562,661	-1,205	$19,986,434	+26.3%	3.48%
FIVN	Five9, Inc. Technology	Reduced	566,846	-155,852	$19,278,432	+25.1%	3.36%
AMRC	Ameresco, Inc. Industrials	Added	896,427	+69,865	$18,565,003	−18.6%	3.23%
EPD	Enterprise Products Partners L.P. Energy	Reduced	508,977	-1,599	$18,124,670	−3.4%	3.16%
KMX	Carmax Inc Consumer Cyclical	Added	326,277	+867	$17,981,125	+4.5%	3.13%
HNGE	Hinge Health, Inc. Healthcare	Reduced	180,163	-2,796	$17,519,050	+15.4%	3.05%
EQIX	Equinix Inc Real Estate	Reduced	16,450	-270	$16,640,491	−4.5%	2.90%
GNRC	Generac Holdings Inc. Industrials	Added	76,684	+3,514	$15,869,753	−25.9%	2.76%
PCRX	Pacira BioSciences, Inc. Healthcare	Added	624,805	+16,188	$15,651,365	+1.4%	2.73%
TMCI	Treace Medical Concepts, Inc. Healthcare	Added	3,415,918	+386,375	$15,166,675	+25.8%	2.64%
AMPL	Amplitude, Inc. Technology	Reduced	1,027,363	-28,145	$14,228,977	+76.2%	2.48%
NVGS	Navigator Holdings Ltd. Energy	NEW	607,557	NEW	$14,083,171	NEW	2.45%
BL	Blackline, Inc. Technology	Added	520,030	+144,261	$13,796,395	+30.8%	2.40%
QDEL	QuidelOrtho Corp Healthcare	Added	1,298,562	+268,191	$13,686,843	−24.2%	2.38%
VERX	Vertex, Inc. Technology	Added	1,045,187	+284,161	$12,312,302	+40.9%	2.14%
PROF	Profound Medical Corp. Healthcare	Added	2,050,587	+90,513	$11,893,404	−8.8%	2.07%
ISRG	Intuitive Surgical Inc Healthcare	Held	29,144	0	$11,850,824	+2.3%	2.06%
CARG	CarGurus, Inc. Communication Services	Added	368,573	+1,500	$11,484,734	−8.2%	2.00%
PRLB	Proto Labs Inc Industrials	Added	118,371	+2,088	$11,227,489	+18.5%	1.96%
ASPN	Aspen Aerogels Inc Basic Materials	Added	1,557,874	+22,062	$8,537,149	−12.3%	1.49%
BKD	Brookdale Senior Living Inc. Healthcare	NEW	739,175	NEW	$8,005,265	NEW	1.39%
BV	BrightView Holdings, Inc. Industrials	NEW	748,393	NEW	$7,483,930	NEW	1.30%
OSUR	Orasure Technologies Inc Healthcare	Added	1,826,604	+234,457	$7,160,287	+0.8%	1.25%
DV	DoubleVerify Holdings, Inc. Communication Services	Reduced	467,095	-56,233	$6,301,111	+11.1%	1.10%
KLTR	Kaltura Inc Technology	Added	4,591,798	+1,324,799	$5,877,501	+38.4%	1.02%
WCPRF	Whitecap Resources Inc. Energy	Added	436,734	+1,634	$5,398,119	+19.5%	0.94%
HZO	Marinemax Inc Consumer Cyclical	Reduced	103,184	-108,296	$5,396,523	−30.3%	0.94%
PNTG	Pennant Group, Inc. Healthcare	Held	135,035	0	$5,266,365	+5.5%	0.92%
CMG	Chipotle Mexican Grill Inc Consumer Cyclical	Added	156,350	+887	$4,995,382	−5.5%	0.87%
ICUI	Icu Medical Inc Healthcare	Added	29,630	+230	$4,755,911	+10.3%	0.83%
CTRE	CareTrust REIT, Inc. Real Estate	Held	129,955	0	$4,753,753	−9.3%	0.83%
CELC	Celcuity Inc. Healthcare	Added	53,319	+79	$4,239,926	−23.9%	0.74%
MCHP	Microchip Technology Inc Technology	Added	26,577	+348	$2,066,893	−13.6%	0.36%
NCNO	nCino, Inc. Technology	Reduced	73,495	-1,838	$1,332,464	+8.2%	0.23%
GNTX	Gentex Corp Consumer Cyclical	Added	58,417	+1,258	$1,269,985	−12.1%	0.22%
SLG	Sl Green Realty Corp Real Estate	Held	25,862	0	$1,265,169	−5.5%	0.22%
SAM	Boston Beer Co Inc Consumer Defensive	Added	7,519	+236	$1,233,266	−4.3%	0.21%
GNL	Global Net Lease, Inc. Real Estate	Reduced	148,055	-12,543	$1,222,934	−14.8%	0.21%
GOOGL	Alphabet Inc. Communication Services	Held	2,556	0	$879,468	−3.7%	0.15%
T	At&T Inc. Communication Services	Added	35,241	+4,343	$859,880	+34.4%	0.15%
MRVL	Marvell Technology, Inc. Technology	Added	3,232	+309	$853,926	−1.9%	0.15%
APPS	Digital Turbine, Inc. Technology	Reduced	74,483	-7,356	$826,761	−21.7%	0.14%
DOCU	Docusign, Inc. Technology	Reduced	12,159	-8,747	$816,476	−12.1%	0.14%
NVDA	Nvidia Corp Technology	Held	3,498	0	$798,873	+14.1%	0.14%
CVLT	Commvault Systems Inc Technology	Added	4,886	+12	$732,509	+6.0%	0.13%

Showing the top 50 of 82 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.