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%

  1. TSEM - Tower Semiconductor 8.9%
  2. FLEX - Flextronics 5.5%
  3. AMD - Advanced Micro Devices 5.5%
  4. IDCC - Interdigital 4.7%
  5. CLS - Celestica 4.5%
  6. COHR - Coherent 4.5%
  7. HNGE — · CL A 4.2%
  8. EXTR - Extreme Networks 4.1%
  9. KLIC - Kulicke & Soffa Inds 4.0%
  10. TWLO - Twilio · CL A 3.7%
  11. CIEN - Ciena 3.6%
  12. LYV - Live Nation 3.5%
  13. Other 43.3%

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

2025 Q1 2024 Q4 · filed 14 May · long equity

Download CSV Download Excel All activity →
IDCC - Interdigital 12.14% Reduce −41.0% 225,002 $206.75 $47M −156,643 −$27M
Pegasystems 11.51% Reduce −20.5% 634,751 $69.52 $44M −163,605 −$30M
TSEM - Tower Semiconductor 11.10% Add +9.8% 1,192,713 $35.66 $43M +106,822 −$13M
CWAN — · CL A 9.56% Reduce −26.6% 1,366,893 $26.80 $37M −495,920 −$15M
FLEX - Flextronics 8.75% Add +0.4% 1,013,582 $33.08 $34M +4,526 −$5M
QRVO - Qorvo 8.37% New 443,100 $72.41 $32M +443,100 +$32M
Elastic 8.35% New 358,934 $89.10 $32M +358,934 +$32M
GWRE - Guidewire Software 7.15% Add +145.7% 146,288 $187.36 $27M +86,756 +$17M
MRVL - Marvell Technology 5.32% Reduce −49.2% 331,045 $61.57 $20M −321,162 −$52M
WIX — 5.04% New 118,173 $163.38 $19M +118,173 +$19M
CART - Maplebear 4.32% Add +0.3% 415,484 $39.89 $17M +1,419 −$577K
PLTR - Palantir Technologies · CL A 4.28% New 194,400 $84.40 $16M +194,400 +$16M
ZM - Zoom Communications · CL A 2.09% New 108,779 $73.77 $8M +108,779 +$8M
NATL - Ncr Atleos 2.01% Reduce −0.1% 292,564 $26.38 $8M −436 −$2M

Exits / last held

not current holdings · last reported size, unchanged · gone vs 2024 Q4

Stock % of portfolio Recent activity Shares Reported price* Value Share change $ change
PYPL - Paypal 3.39% Exit 0 $85.35 $23M −269,470 −$23M
BL - Blackline 2.93% Exit 0 $60.76 $20M −326,313 −$20M
GPN - Global Pmts 2.62% Exit 0 $112.06 $18M −158,356 −$18M
Informatica · CL A 2.38% Exit 0 $25.93 $16M −622,431 −$16M
Confluent · CLASS A 1.48% Exit 0 $27.96 $10M −359,019 −$10M
TALK - Talkspace 1.47% Exit 0 $3.09 $10M −3,226,598 −$10M
DOCU - Docusign 0.13% Exit 0 $89.90 $899K −10,000 −$899K

* 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 2024 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

Newest filings
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