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

2022 Q1 2021 Q4 · filed 16 May · long equity

FLEX - Flextronics 8.10% Reduce −25.5% 3,934,809 $18.55 $73M −1,347,377 −$24M
MANH - Manhattan Associates 7.19% Add +25.3% 467,207 $138.71 $65M +94,201 +$7M
DT - Dynatrace 6.64% Reduce −22.6% 1,271,689 $47.10 $60M −372,329 −$39M
NYT - New York Times · CL A 5.81% Add +77.9% 1,143,070 $45.84 $52M +500,470 +$21M
GTM - Zoominfo Technologies · CL A 4.15% Reduce −8.0% 626,622 $59.74 $37M −54,199 −$6M
NICE — 3.89% New 160,184 $219.00 $35M +160,184 +$35M
Pegasystems 3.63% New 406,289 $80.65 $33M +406,289 +$33M
WMG - Warner Music Group · CL A 3.49% Reduce −40.3% 830,236 $37.85 $31M −559,476 −$29M
SONO - Sonos 3.47% Reduce −8.6% 1,107,714 $28.22 $31M −104,248 −$5M
DOCN - Digitalocean 3.44% Reduce −15.5% 535,888 $57.85 $31M −98,594 −$20M
IDCC - Interdigital 3.37% Reduce −31.0% 475,889 $63.80 $30M −213,669 −$19M
Holding 3.19% Reduce −12.2% 1,471,189 $19.57 $29M −204,654 −$4M
UBER - UBER Technologies 3.14% Add +34.6% 792,843 $35.68 $28M +203,743 +$4M
Elastic 2.81% New 284,287 $88.95 $25M +284,287 +$25M
RMBS - Rambus Del 2.77% Reduce −16.0% 781,855 $31.89 $25M −149,118 −$2M
FIVN - FIVE9 2.66% Reduce −49.2% 217,538 $110.40 $24M −210,478 −$35M
FLYW - Flywire 2.11% New 622,474 $30.58 $19M +622,474 +$19M
MTCH - Match Group 2.07% New 171,800 $108.74 $19M +171,800 +$19M
Farfetch · CL A 2.01% New 1,197,429 $15.12 $18M +1,197,429 +$18M
GDDY - Godaddy · CL A 2.01% Reduce −73.7% 216,282 $83.70 $18M −607,575 −$52M
IAC - Iac Interactivecorp 1.63% Add +17412.5% 12,606,559 $1.16 $15M +12,534,573 +$5M
Holding · CL A 1.40% Hold 1,275,351 $9.90 $13M
V - VISA · CL A 1.27% New 51,536 $221.77 $11M +51,536 +$11M
ADSK - Autodesk 1.20% Reduce −37.3% 50,369 $214.36 $11M −30,006 −$12M
SFM - Sprout Social · CL A 1.00% Reduce −78.1% 112,011 $80.12 $9M −400,014 −$37M
Knowbe4 · CL A 0.98% Reduce −87.4% 383,655 $23.02 $9M −2,656,143 −$61M
AMBA - Ambarella 0.85% Reduce −39.6% 72,786 $104.92 $8M −47,774 −$17M
Cascade Acquisition · CL A 0.56% Add +0.4% 501,966 $10.08 $5M +1,966 +$90K
Macondray Cap Acquisitn 0.53% New 475,000 $10.00 $5M +475,000 +$5M
Silicon Laboratories 0.49% Reduce −9.0% 29,338 $150.21 $4M −2,900 −$2M
Zendesk 0.39% Reduce −10.4% 29,520 $120.29 $4M −3,439 +$114K
Instructure 0.35% Reduce −13.2% 158,353 $20.06 $3M −24,010 −$1M
Holding 0.27% New 250,000 $9.78 $2M +250,000 +$2M
Holding · CL A 0.22% Hold 200,000 $9.88 $2M
Innovid 0.01% Hold 20,000 $6.05 $121K
Class Acceleration 0.01% 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 Q4

Stock % of portfolio Recent activity Shares Reported price* Value Share change $ change
Supernova Partners Acquistn 0.67% Exit 0 $10.96 $7M −600,000 −$7M
INTU - Intuit 0.64% Exit 0 $643.19 $6M −9,739 −$6M
ZS - Zscaler 0.49% Exit 0 $321.31 $5M −14,889 −$5M
Macondray Cap Acquisitn · CLASS A 0.48% Exit 0 $9.98 $5M −475,000 −$5M
Sps Comm 0.45% Exit 0 $142.34 $4M −31,306 −$4M
OKTA - OKTA Inc · CL A 0.37% Exit 0 $224.20 $4M −16,084 −$4M
S - Sentinelone · CL A 0.35% Exit 0 $50.49 $3M −68,574 −$3M
Holding · CL A 0.25% Exit 0 $9.90 $2M −250,000 −$2M

* 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 Q4. 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