Follow-The-Filings

Featured 13F manager

Shannon River Fund Management LLC Spencer Waxman

New York, NY 21 processed 13Fs on this site · 2021 Q3–2026 Q2

  • $1.1B
  • 37 Positions
  • 2026 Q2
  • +113.7% QoQ
  • Top 5 29.1%

Spencer Waxman files Shannon River Fund Management LLC as a Form 13F. The latest book is 2026 Q2 at $1.1B, up 113.7% QoQ, led by Tower Semiconductor, Flextronics, and Advanced Micro Devices.

Portfolio

2026 Q2 · filed 8/13/2026 · 37 long · top 12 shown

top 5 29.1% · top 10 49.6%

AUM over time

2026 Q2 $1.1B +113.7% QoQ
2021 Q3 · $1.4B 2021 Q3 · $1.4B
Q3 2021
2021 Q4 · $986M · −30.5% QoQ 2021 Q4 · $986M · −30.5% QoQ
Q4
2022 Q1 · $901M · −8.6% QoQ 2022 Q1 · $901M · −8.6% QoQ
Q1 2022
2022 Q2 · $352M · −60.9% QoQ 2022 Q2 · $352M · −60.9% QoQ
Q2
2022 Q3 · $233M · −33.8% QoQ 2022 Q3 · $233M · −33.8% QoQ
Q3
2022 Q4 · $408M · +75.1% QoQ 2022 Q4 · $408M · +75.1% QoQ
Q4
2023 Q1 · $443M · +8.6% QoQ 2023 Q1 · $443M · +8.6% QoQ
Q1 2023
2023 Q2 · $401M · −9.5% QoQ 2023 Q2 · $401M · −9.5% QoQ
Q2
2023 Q3 · $503M · +25.4% QoQ 2023 Q3 · $503M · +25.4% QoQ
Q3
2023 Q4 · $547M · +8.7% QoQ 2023 Q4 · $547M · +8.7% QoQ
Q4
2024 Q1 · $449M · −17.9% QoQ 2024 Q1 · $449M · −17.9% QoQ
Q1 2024
2024 Q2 · $620M · +38.1% QoQ 2024 Q2 · $620M · +38.1% QoQ
Q2
2024 Q3 · $715M · +15.3% QoQ 2024 Q3 · $715M · +15.3% QoQ
Q3
2024 Q4 · $678M · −5.2% QoQ 2024 Q4 · $678M · −5.2% QoQ
Q4
2025 Q1 · $383M · −43.5% QoQ 2025 Q1 · $383M · −43.5% QoQ
Q1 2025
2025 Q2 · $752M · +96.3% QoQ 2025 Q2 · $752M · +96.3% QoQ
Q2
2025 Q3 · $621M · −17.4% QoQ 2025 Q3 · $621M · −17.4% QoQ
Q3
2025 Q4 · $638M · +2.7% QoQ 2025 Q4 · $638M · +2.7% QoQ
Q4
2026 Q1 · $524M · −17.9% QoQ 2026 Q1 · $524M · −17.9% QoQ
Q1 2026
2026 Q2 · $1.1B · +113.7% QoQ 2026 Q2 · $1.1B · +113.7% QoQ
Q2

Book

2021 Q4 2021 Q3 · filed 14 Feb · long equity

DT - Dynatrace 10.06% Reduce −1.5% 1,644,018 $60.35 $99M −24,720 −$19M
FLEX - Flextronics 9.82% Add +0.8% 5,282,186 $18.33 $97M +41,000 +$4M
GDDY - Godaddy · CL A 7.09% Add +11.9% 823,857 $84.86 $70M +87,618 +$19M
Knowbe4 · CL A 7.07% New 3,039,798 $22.94 $70M +3,039,798 +$70M
WMG - Warner Music Group · CL A 6.09% Reduce −22.5% 1,389,712 $43.18 $60M −403,021 −$17M
FIVN - FIVE9 5.96% New 428,016 $137.32 $59M +428,016 +$59M
MANH - Manhattan Associates 5.88% Add +16.7% 373,006 $155.49 $58M +53,300 +$9M
DOCN - Digitalocean 5.17% Reduce −10.6% 634,482 $80.33 $51M −74,953 −$4M
IDCC - Interdigital 5.01% Reduce −2.3% 689,558 $71.63 $49M −16,531 +$2M
SFM - Sprout Social · CL A 4.71% Reduce −13.7% 512,025 $90.69 $46M −81,600 −$26M
GTM - Zoominfo Technologies · CL A 4.43% Reduce −30.8% 680,821 $64.20 $44M −303,181 −$17M
SONO - Sonos 3.66% Add +41.8% 1,211,962 $29.80 $36M +357,000 +$8M
Holding 3.36% Reduce −0.2% 1,675,843 $19.79 $33M −3,276 −$2M
NYT - New York Times · CL A 3.15% Reduce −0.1% 642,600 $48.30 $31M −846 −$665K
RMBS - Rambus Del 2.78% Add +26.2% 930,973 $29.39 $27M +193,000 +$11M
UBER - UBER Technologies 2.51% Reduce −44.5% 589,100 $41.93 $25M −472,900 −$23M
AMBA - Ambarella 2.48% Reduce −43.3% 120,560 $202.89 $24M −91,997 −$9M
ADSK - Autodesk 2.29% Reduce −32.0% 80,375 $281.19 $23M −37,872 −$11M
Holding · CL A 1.27% Hold 1,275,351 $9.84 $13M
IAC - Iac Interactivecorp 0.95% Add +5.9% 71,986 $130.71 $9M +4,037 +$556K
Silicon Laboratories 0.68% Reduce −68.7% 32,238 $206.43 $7M −70,762 −$8M
Supernova Partners Acquistn 0.67% Hold 600,000 $10.96 $7M
INTU - Intuit 0.64% New 9,739 $643.19 $6M +9,739 +$6M
Cascade Acquisition · CL A 0.50% Hold 500,000 $9.94 $5M
ZS - Zscaler 0.49% New 14,889 $321.31 $5M +14,889 +$5M
Macondray Cap Acquisitn · CLASS A 0.48% New 475,000 $9.98 $5M +475,000 +$5M
Sps Comm 0.45% Reduce −87.1% 31,306 $142.34 $4M −211,020 −$35M
Instructure 0.44% Hold 182,363 $23.98 $4M
OKTA - OKTA Inc · CL A 0.37% New 16,084 $224.20 $4M +16,084 +$4M
S - Sentinelone · CL A 0.35% New 68,574 $50.49 $3M +68,574 +$3M
Zendesk 0.35% New 32,959 $104.28 $3M +32,959 +$3M
Holding · CL A 0.25% New 250,000 $9.90 $2M +250,000 +$2M
Holding · CL A 0.20% Hold 200,000 $9.76 $2M
Innovid 0.01% New 20,000 $6.65 $133K +20,000 +$133K
Class Acceleration 0.00% Hold 5,000 $9.80 $49K
Holding 0.00% Hold 1,000 $10.00 $10K

Exits / last held

not current holdings · last reported size, unchanged · gone vs 2021 Q3

Stock % of portfolio Recent activity Shares Reported price* Value Share change $ change
COUR - Coursera 2.68% Exit 0 $31.65 $38M −1,201,635 −$38M
PRTSEUR - Carparts 1.49% Exit 0 $15.61 $21M −1,355,632 −$21M
Lightspeed Pos 1.43% Exit 0 $96.43 $20M −210,000 −$20M
Smartsheet · CL A 1.40% Exit 0 $68.82 $20M −287,983 −$20M
Pegasystems 1.20% Exit 0 $127.10 $17M −134,411 −$17M
TCOM - Tripadvisor 0.99% Exit 0 $33.85 $14M −414,188 −$14M
ACVA - Acv Auctions · CL A 0.90% Exit 0 $17.89 $13M −714,355 −$13M
RUN - Sunrun 0.88% Exit 0 $44.00 $12M −282,150 −$12M
TTWO - Take Two 0.69% Exit 0 $154.06 $10M −63,500 −$10M
Zynga · CL A 0.64% Exit 0 $7.53 $9M −1,196,800 −$9M
EVTC - Evertec 0.39% Exit 0 $45.72 $6M −120,564 −$6M
Macondray Cap Acquisitn 0.33% Exit 0 $9.98 $5M −475,000 −$5M
RSVR - Reservoir Media 0.25% Exit 0 $9.11 $3M −383,417 −$3M
890 5th Ave Partners · CL A 0.21% Exit 0 $9.91 $3M −300,000 −$3M
Holding 0.17% Exit 0 $9.88 $2M −250,000 −$2M
SNAP — · CL A 0.10% Exit 0 $73.85 $1M −19,039 −$1M
WDAY - Workday · CL A 0.07% Exit 0 $250.00 $1M −4,128 −$1M
TEAM - Atlassian · CL A 0.04% Exit 0 $391.14 $636K −1,626 −$636K
Ion Acquisition 2 0.01% Exit 0 $10.00 $200K −20,000 −$200K

* Reported price is value ÷ shares from the 13F as of period end — not a live market quote. Weight % is each long-equity position ÷ full 13F AUM, so rows may not sum to 100% when the filing includes options or other non-equity (excluded from this table). Share change and $ change are vs 2021 Q3. Click column headers to sort · click New / Hold / Add / Reduce to promote that move type to the top. Exit opens the last-held block below.

Filings history

20 periods · normalized AUM · open a period for holdings

Period Holdings AUM QoQ Form Filed Filing ID
2026 Q2 37 $1.1B +113.7% 13F-HR 8/13/2026 000101359426000886
2026 Q1 28 $524M −17.9% 13F-HR 5/14/2026 000101359426000581
2025 Q4 26 $638M +2.7% 13F-HR 2/17/2026 000101359426000239
2025 Q3 20 $621M −17.4% 13F-HR 11/13/2025 000101359425001398
2025 Q2 24 $752M +96.3% 13F-HR 8/13/2025 000101359425000992
2025 Q1 14 $383M −43.5% 13F-HR 5/14/2025 000101359425000645
2024 Q4 19 $678M −5.2% 13F-HR 2/13/2025 000101359425000260
2024 Q3 19 $715M +15.3% 13F-HR 11/13/2024 000101359424000941
2024 Q2 22 $620M +38.1% 13F-HR 8/13/2024 000101359424000640
2024 Q1 18 $449M −17.9% 13F-HR 5/14/2024 000101359424000471
2023 Q4 23 $547M +8.7% 13F-HR 2/13/2024 000101359424000153
2023 Q3 16 $503M +25.4% 13F-HR 11/13/2023 000101359423000910
2023 Q2 15 $401M −9.5% 13F-HR 8/11/2023 000101359423000659
2023 Q1 27 $443M +8.6% 13F-HR 5/12/2023 000101359423000466
2022 Q4 30 $408M +75.1% 13F-HR 2/13/2023 000101359423000174
2022 Q3 30 $233M −33.8% 13F-HR 11/14/2022 000156761922019714
2022 Q2 35 $352M −60.9% 13F-HR 8/15/2022 000156761922016018
2022 Q1 48 $901M RESTATEMENT 7/20/2022 000156761922014249
2022 Q1 48 $901M −8.6% 13F-HR 5/16/2022 000156761922010783
2021 Q4 45 $986M −30.5% 13F-HR 2/14/2022 000156761922003912
2021 Q3 57 $1.4B 13F-HR 11/15/2021 000156761921020217

About

Shannon River Fund Management LLC

21 processed 13Fs on this site · 2021 Q3–2026 Q2

Entity
Shannon River Fund Management LLC
Notable person
Spencer Waxman
Location
New York, NY
All SEC filings
View on sec.gov