GAGNON SECURITIES LLC

Registered adviser

CIK

1125725

Location

New York, NY

Portfolio Value

Small $505,660,293

Diversification

Diversified

Filing Date

Global Rank

#3,811 / 8,818 ▲ 55

Top Industry

Diagnostics & Research 17.1%

Period ended 4 months ago

Filed Aug 5, 2026 · 3mo

26 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, Oct 1, 2026

Form ADV adviser

CRD 103727

Roster of Oct 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 Oct 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.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, 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

Low turnover

28.7% over the last four quarters (under 30%)

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

79 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

10.0%

+1.6 pts

Top 5

31.4%

+1.9 pts

Top 10

49.0%

+1.7 pts

HHI

382

Diversified+39

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Healthcare	47.6%	$240,779,578	23
Technology	15.0%	$76,028,707	24
Industrials	10.7%	$54,269,169	5
Consumer Cyclical	10.0%	$50,723,607	8
Real Estate	5.0%	$25,447,065	4
Energy	4.8%	$24,230,973	4
Communication Services	4.1%	$20,893,591	6
Basic Materials	1.9%	$9,737,048	1
Financial Services	0.4%	$2,261,246	3
Consumer Defensive	0.3%	$1,289,309	1

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

24 positions

Ticker	Company	Δ Shares	Shares	Value
QDEL	QuidelOrtho Corp	+627,046	1,030,371	$18,052,099
VERX	Vertex, Inc.	+292,806	761,026	$8,736,578
WGS	GeneDx Holdings Corp.	+221,716	524,865	$36,031,982
WEAV	Weave Communications, Inc.	+122,950	157,170	$941,447
FIVN	Five9, Inc.	+100,634	722,698	$15,407,921
CARG	CarGurus, Inc.	+95,549	367,073	$12,513,518
BL	Blackline, Inc.	+79,345	375,769	$10,547,835
HNGE	Hinge Health, Inc.	+58,709	182,959	$15,185,597
DV	DoubleVerify Holdings, Inc.	+34,866	523,328	$5,672,875
CNF	CNFinance Holdings Ltd.	+18,407	332,345	$920,595
PROF	Profound Medical Corp.	+15,750	1,960,074	$13,034,492
KMX	Carmax Inc	+15,711	325,410	$17,210,934
CDNA	CareDx, Inc.	+8,861	1,770,735	$50,465,947
PRLB	Proto Labs Inc	+5,394	116,283	$9,478,227
TECH	BIO-TECHNE Corp	+2,351	12,230	$864,049
CVLT	Commvault Systems Inc	+498	4,874	$690,792
AKAM	Akamai Technologies Inc	+267	3,163	$373,898
GNTX	Gentex Corp	+226	57,159	$1,444,407
RNG	RingCentral, Inc.	+95	8,517	$331,992
SHOP	Shopify Inc.	+91	4,023	$459,346
ELVA	Electrovaya Inc.	+50	26,307	$276,223
SAM	Boston Beer Co Inc	+44	7,283	$1,289,309
CGNX	Cognex Corp	+18	9,798	$709,571
MSFT	Microsoft Corp	+11	556	$207,399
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
TMCI	Treace Medical Concepts, Inc.	−2,172,343	3,029,543	$12,057,581
ASPN	Aspen Aerogels Inc	−326,039	1,535,812	$9,737,048
PTEN	Patterson Uti Energy Inc	−297,226	17,420	$159,915
FRSH	Freshworks Inc.	−167,501	1,563,866	$15,826,323
OSUR	Orasure Technologies Inc	−122,244	1,592,147	$7,100,975
PFE	Pfizer Inc	−20,914	23,346	$562,171
ATNM	Actinium Pharmaceuticals, Inc.	−19,158	182,142	$178,499
AMRC	Ameresco, Inc.	−13,501	826,562	$22,813,111
KLTR	Kaltura Inc	−11,937	3,266,999	$4,247,098
RNTX	Rein Therapeutics, Inc.	−10,450	229,070	$238,232
GNL	Global Net Lease, Inc.	−9,527	160,598	$1,435,746
HZO	Marinemax Inc	−9,130	211,480	$7,744,397
PCRX	Pacira BioSciences, Inc.	−8,893	608,617	$15,440,613
ENSG	Ensign Group, Inc	−5,760	173,911	$27,877,933
HIMX	Himax Technologies, Inc.	−5,275	39,498	$605,899
VIAV	Viavi Solutions Inc.	−4,525	9,986	$476,831
AMPL	Amplitude, Inc.	−4,328	1,055,508	$8,074,636
NCNO	nCino, Inc.	−4,187	75,333	$1,231,694
MRVL	Marvell Technology, Inc.	−3,902	2,923	$870,732
EPD	Enterprise Products Partners L.P.	−3,681	510,576	$18,768,773
CAKE	Cheesecake Factory Inc	−3,256	221,792	$17,641,335
CTRE	CareTrust REIT, Inc.	−3,091	129,955	$5,243,684
ISRG	Intuitive Surgical Inc	−2,475	29,144	$11,589,985
PNTG	Pennant Group, Inc.	−2,449	135,035	$4,989,543
MTSI	MACOM Technology Solutions Holdings, Inc.	−2,389	1,281	$487,253
No positions match the current search.

New Positions

Positions the filer opened this quarter

2 positions

Ticker	Company	Shares	Value
WRBY	Warby Parker Inc.	11,381	$345,299
VCEL	Vericel Corp	7,303	$324,910
No positions match the current search.

Sold Out

Positions the filer fully exited

6 positions

Ticker	Company	Shares	Value
NVGS	Navigator Holdings Ltd.	886,631	$17,138,577
SGOV	iShares 0-3 Month Treasury Bond ETF	92,702	$9,331,383
AOSL	ALPHA & OMEGA SEMICONDUCTOR Ltd	167,874	$3,720,087
GRSD	GRANDSTAND Ltd	109,697	$425,624
EOG	Eog Resources Inc	1,851	$267,599
SVV	Savers Value Village, Inc.	25,148	$187,101
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

79 tracked positions · $505,660,293 total · filing declares 85 positions · $518,827,266 · as of Jun 30, 2026

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

Showing 1–50 of 79 positions by value · page 1 of 2

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	Held (qtrs)	Est. cost/share	% of Portfolio
CDNA	CareDx, Inc. Healthcare	Added	1,770,735	+8,861	$50,465,947	+65.0%	26+	before history	9.98%
WGS	GeneDx Holdings Corp. Healthcare	Added	524,865	+221,716	$36,031,982	+85.1%	20	unpriced	7.13%
ENSG	Ensign Group, Inc Healthcare	Reduced	173,911	-5,760	$27,877,933	−23.0%	26+	before history	5.51%
AMRC	Ameresco, Inc. Industrials	Reduced	826,562	-13,501	$22,813,111	+6.5%	26+	before history	4.51%
GNRC	Generac Holdings Inc. Industrials	Reduced	73,170	-1,743	$21,424,907	+46.4%	26+	before history	4.24%
EPD	Enterprise Products Partners L.P. Energy	Reduced	510,576	-3,681	$18,768,773	−3.5%	26+	before history	3.71%
QDEL	QuidelOrtho Corp Healthcare	Added	1,030,371	+627,046	$18,052,099	+172.4%	17	$20.78	3.57%
CAKE	Cheesecake Factory Inc Consumer Cyclical	Reduced	221,792	-3,256	$17,641,335	+43.2%	26+	before history	3.49%
EQIX	Equinix Inc Real Estate	Reduced	16,720	-231	$17,428,760	+4.9%	26+	before history	3.45%
KMX	Carmax Inc Consumer Cyclical	Added	325,410	+15,711	$17,210,934	+33.7%	26+	before history	3.40%
FRSH	Freshworks Inc. Technology	Reduced	1,563,866	-167,501	$15,826,323	+13.8%	20	unpriced	3.13%
PCRX	Pacira BioSciences, Inc. Healthcare	Reduced	608,617	-8,893	$15,440,613	+10.6%	26+	before history	3.05%
FIVN	Five9, Inc. Technology	Added	722,698	+100,634	$15,407,921	+63.3%	26+	before history	3.05%
HNGE	Hinge Health, Inc. Healthcare	Added	182,959	+58,709	$15,185,597	+217.0%	2	$45.64	3.00%
BLFS	Biolife Solutions Inc Healthcare	Reduced	535,906	-606	$15,133,985	+47.8%	25	$18.69	2.99%
PROF	Profound Medical Corp. Healthcare	Added	1,960,074	+15,750	$13,034,492	+3.5%	26+	before history	2.58%
CARG	CarGurus, Inc. Communication Services	Added	367,073	+95,549	$12,513,518	+35.3%	16	$22.72	2.47%
TMCI	Treace Medical Concepts, Inc. Healthcare	Reduced	3,029,543	-2,172,343	$12,057,581	+73.0%	9	$4.46	2.38%
ISRG	Intuitive Surgical Inc Healthcare	Reduced	29,144	-2,475	$11,589,985	−20.5%	26+	before history	2.29%
BL	Blackline, Inc. Technology	Added	375,769	+79,345	$10,547,835	−3.8%	26+	before history	2.09%
ASPN	Aspen Aerogels Inc Basic Materials	Reduced	1,535,812	-326,039	$9,737,048	+52.9%	5	$4.82	1.93%
PRLB	Proto Labs Inc Industrials	Added	116,283	+5,394	$9,478,227	+49.9%	26+	before history	1.87%
VERX	Vertex, Inc. Technology	Added	761,026	+292,806	$8,736,578	+56.9%	11	$22.20	1.73%
AMPL	Amplitude, Inc. Technology	Reduced	1,055,508	-4,328	$8,074,636	+11.7%	4	$10.40	1.60%
HZO	Marinemax Inc Consumer Cyclical	Reduced	211,480	-9,130	$7,744,397	+29.7%	4	$25.33	1.53%
OSUR	Orasure Technologies Inc Healthcare	Reduced	1,592,147	-122,244	$7,100,975	+38.1%	6	$3.37	1.40%
DV	DoubleVerify Holdings, Inc. Communication Services	Added	523,328	+34,866	$5,672,875	+22.2%	11	$15.74	1.12%
CELC	Celcuity Inc. Healthcare	Reduced	53,240	-102	$5,569,968	−8.5%	26+	before history	1.10%
CMG	Chipotle Mexican Grill Inc Consumer Cyclical	Reduced	155,463	-2,386	$5,285,742	+4.6%	26+	before history	1.05%
CTRE	CareTrust REIT, Inc. Real Estate	Reduced	129,955	-3,091	$5,243,684	+7.5%	26+	before history	1.04%
PNTG	Pennant Group, Inc. Healthcare	Reduced	135,035	-2,449	$4,989,543	+19.1%	26+	before history	0.99%
WCPRF	Whitecap Resources Inc. Energy	Reduced	435,100	-318	$4,516,338	−7.9%	6	unpriced	0.89%
ICUI	Icu Medical Inc Healthcare	Reduced	29,400	-343	$4,310,040	+12.2%	14	$143.96	0.85%
KLTR	Kaltura Inc Technology	Reduced	3,266,999	-11,937	$4,247,098	+6.2%	13	$1.71	0.84%
MCHP	Microchip Technology Inc Technology	Reduced	26,229	-609	$2,392,084	+38.0%	26+	before history	0.47%
GNTX	Gentex Corp Consumer Cyclical	Added	57,159	+226	$1,444,407	+16.1%	26+	before history	0.29%
GNL	Global Net Lease, Inc. Real Estate	Reduced	160,598	-9,527	$1,435,746	−9.8%	12	$8.60	0.28%
SLG	Sl Green Realty Corp Real Estate	Held	25,862	0	$1,338,875	+40.1%	24	unpriced	0.26%
SAM	Boston Beer Co Inc Consumer Defensive	Added	7,283	+44	$1,289,309	−22.7%	17	$308.00	0.25%
NCNO	nCino, Inc. Technology	Reduced	75,333	-4,187	$1,231,694	+3.4%	7	$30.43	0.24%
FLG	Flagstar Bank, National Association Financial Services	Reduced	74,456	-255	$1,112,372	+13.1%	9	unpriced	0.22%
APPS	Digital Turbine, Inc. Technology	Held	81,839	0	$1,055,723	+347.9%	14	$5.08	0.21%
WEAV	Weave Communications, Inc. Healthcare	Added	157,170	+122,950	$941,447	+495.5%	7	$6.71	0.19%
DOCU	Docusign, Inc. Technology	Reduced	20,906	-326	$928,644	−7.7%	2	$51.16	0.18%
CNF	CNFinance Holdings Ltd. Financial Services	Added	332,345	+18,407	$920,595	−25.0%	26+	before history	0.18%
GOOGL	Alphabet Inc. Communication Services	Held	2,556	0	$913,437	+24.3%	22	$99.80	0.18%
MRVL	Marvell Technology, Inc. Technology	Reduced	2,923	-3,902	$870,732	+28.8%	22	$53.81	0.17%
TECH	BIO-TECHNE Corp Healthcare	Added	12,230	+2,351	$864,049	+67.4%	12	$68.64	0.17%
DVN	Devon Energy Corp Energy	Reduced	19,021	-45	$785,947	−18.1%	22	$30.60	0.16%
MU	Micron Technology Inc Technology	Reduced	679	-398	$783,762	+115.4%	14	$66.33	0.15%

Showing the top 50 of 79 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.