Shannon River Fund Management LLC

CIK

1301050

Location

NEW YORK, NY

Portfolio Value

Small $524,080,631

Diversification

Diversified

Filing Date

Global Rank

#2,531 / 8,603 ▼ 198 · as of Mar 2026

Top Industry

Semiconductors 34.7%

3Y Alpha vs SPY

+21.4%

Period ended 3 months ago

Filed May 14, 2026 · 56d

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+189.2%

SPY

+76.5%

Annualised alpha

+21.6%

Max drawdown

−31.1%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

28 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

16.9%

+5.8 pts

Top 5

47.5%

+8.6 pts

Top 10

66.7%

+3.7 pts

HHI

688

Diversified+135

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	66.5%	$348,694,889	17
Communication Services	11.3%	$59,272,381	3
Industrials	7.5%	$39,211,183	2
Consumer Cyclical	6.0%	$31,191,917	1
Healthcare	3.1%	$16,086,537	1
Real Estate	2.0%	$10,378,289	2
Unclassified	1.9%	$9,982,557	1
Energy	1.8%	$9,262,878	1

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

7 positions

Ticker	Company	Δ Shares	Shares	Value
MRVL	Marvell Technology, Inc.	+185,889	563,573	$55,821,905
HNGE	Hinge Health, Inc.	+183,828	417,182	$16,086,537
LYV	Live Nation Entertainment, Inc.	+38,965	294,398	$44,898,638
AXON	Axon Enterprise, Inc.	+26,726	47,442	$20,148,142
LGN	Legence Corp.	+2,775	337,638	$19,063,041
IDCC	InterDigital, Inc.	+614	54,104	$16,339,408
PLTR	Palantir Technologies Inc.	+185	29,150	$4,264,062
No positions match the current search.

Trimmed

Positions the filer reduced

8 positions

Ticker	Company	Δ Shares	Shares	Value
EXTR	Extreme Networks Inc	−591,467	1,313,061	$19,800,959
AMBA	Ambarella Inc	−186,153	114,940	$5,917,111
ALAB	Astera Labs, Inc.	−120,247	47,394	$5,194,382
TSEM	Tower Semiconductor Ltd	−98,565	504,239	$88,483,859
COHR	Coherent Corp.	−80,013	87,905	$20,939,850
GWRE	Guidewire Software, Inc.	−63,194	62,863	$9,401,790
CLS	Celestica Inc	−53,635	53,495	$15,068,471
FLEX	Flex Ltd.	−2,050	311,223	$20,372,657
No positions match the current search.

New Positions

Positions the filer opened this quarter

13 positions

Ticker	Company	Shares	Value
ABNB	Airbnb, Inc.	247,006	$31,191,917
RMBS	Rambus Inc	333,817	$28,718,276
TOST	Toast, Inc.	732,027	$19,406,035
ADTN	ADTRAN Holdings, Inc.	1,219,976	$15,347,298
FFIV	F5, Inc.	50,196	$14,523,208
LION	Lionsgate Studios Corp.	1,040,934	$9,982,557
UUUU	Energy Fuels Inc	507,555	$9,262,878
SPHR	Sphere Entertainment Co.	73,345	$8,610,703
APP	AppLovin Corp	14,480	$5,763,040
DLR	Digital Realty Trust, Inc.	29,838	$5,377,105
OSIS	Osi Systems Inc	19,274	$5,117,439
EQIX	Equinix Inc	5,102	$5,001,184
SNOW	Snowflake Inc.	26,377	$3,978,179
No positions match the current search.

Sold Out

Positions the filer fully exited

11 positions

Ticker	Company	Shares	Value
PEGA	Pegasystems Inc	1,038,832	$62,039,047
U	Unity Software Inc.	1,065,452	$47,061,014
CWAN	Clearwater Analytics Holdings, Inc.	1,236,412	$29,822,257
NCNO	nCino, Inc.	1,135,922	$29,125,040
KVYO	Klaviyo, Inc.	729,703	$23,693,456
CRDO	Credo Technology Group Holding Ltd	149,966	$21,578,607
DOCU	Docusign, Inc.	156,813	$10,726,009
CCC	CCC Intelligent Solutions Holdings Inc.	1,075,546	$8,550,590
QCOM	Qualcomm Inc/De	46,212	$7,904,562
MU	Micron Technology Inc	20,400	$5,822,364
WIX	Wix.com Ltd.	46,731	$4,854,883
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

28 positions · $524,080,631 total · as of Mar 31, 2026

All sectors Communication Services Consumer Cyclical Energy Healthcare Industrials Real Estate Technology

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
TSEM	Tower Semiconductor Ltd Technology	Reduced	504,239	-98,565	$88,483,859	+25.0%	16.88%
MRVL	Marvell Technology, Inc. Technology	Added	563,573	+185,889	$55,821,905	+73.9%	10.65%
LYV	Live Nation Entertainment, Inc. Communication Services	Added	294,398	+38,965	$44,898,638	+23.4%	8.57%
ABNB	Airbnb, Inc. Consumer Cyclical	NEW	247,006	NEW	$31,191,917	NEW	5.95%
RMBS	Rambus Inc Technology	NEW	333,817	NEW	$28,718,276	NEW	5.48%
COHR	Coherent Corp. Technology	Reduced	87,905	-80,013	$20,939,850	−32.4%	4.00%
FLEX	Flex Ltd. Technology	Reduced	311,223	-2,050	$20,372,657	+7.6%	3.89%
AXON	Axon Enterprise, Inc. Industrials	Added	47,442	+26,726	$20,148,142	+71.3%	3.84%
EXTR	Extreme Networks Inc Technology	Reduced	1,313,061	-591,467	$19,800,959	−37.6%	3.78%
TOST	Toast, Inc. Technology	NEW	732,027	NEW	$19,406,035	NEW	3.70%
LGN	Legence Corp. Industrials	Added	337,638	+2,775	$19,063,041	+32.3%	3.64%
IDCC	InterDigital, Inc. Technology	Added	54,104	+614	$16,339,408	−4.1%	3.12%
HNGE	Hinge Health, Inc. Healthcare	Added	417,182	+183,828	$16,086,537	+48.4%	3.07%
ADTN	ADTRAN Holdings, Inc. Technology	NEW	1,219,976	NEW	$15,347,298	NEW	2.93%
CLS	Celestica Inc Technology	Reduced	53,495	-53,635	$15,068,471	−52.4%	2.88%
FFIV	F5, Inc. Technology	NEW	50,196	NEW	$14,523,208	NEW	2.77%
LION	Lionsgate Studios Corp.	NEW	1,040,934	NEW	$9,982,557	NEW	1.90%
GWRE	Guidewire Software, Inc. Technology	Reduced	62,863	-63,194	$9,401,790	−62.9%	1.79%
UUUU	Energy Fuels Inc Energy	NEW	507,555	NEW	$9,262,878	NEW	1.77%
SPHR	Sphere Entertainment Co. Communication Services	NEW	73,345	NEW	$8,610,703	NEW	1.64%
AMBA	Ambarella Inc Technology	Reduced	114,940	-186,153	$5,917,111	−72.3%	1.13%
APP	AppLovin Corp Communication Services	NEW	14,480	NEW	$5,763,040	NEW	1.10%
DLR	Digital Realty Trust, Inc. Real Estate	NEW	29,838	NEW	$5,377,105	NEW	1.03%
ALAB	Astera Labs, Inc. Technology	Reduced	47,394	-120,247	$5,194,382	−81.4%	0.99%
OSIS	Osi Systems Inc Technology	NEW	19,274	NEW	$5,117,439	NEW	0.98%
EQIX	Equinix Inc Real Estate	NEW	5,102	NEW	$5,001,184	NEW	0.95%
PLTR	Palantir Technologies Inc. Technology	Added	29,150	+185	$4,264,062	−17.2%	0.81%
SNOW	Snowflake Inc. Technology	NEW	26,377	NEW	$3,978,179	NEW	0.76%