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Shannon River Fund Management LLC Spencer Waxman

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

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

Portfolio

2026 Q2, filed 8/13/2026, top 12 of 37 holdings

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 4.2%
  8. EXTR, Extreme Networks 4.1%
  9. KLIC, Kulicke & Soffa Industries 4.0%
  10. TWLO, Twilio 3.7%
  11. CIEN, Ciena 3.6%
  12. LYV, Live Nation Entertainment 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

2021 Q3, filed 15 Nov, long equity only

Download CSV Download Excel
DT, Dynatrace 8.35% Hold 1,668,738 $70.97 $118M
FLEX, Flextronics 6.54% Hold 5,241,186 $17.68 $93M
WMG, Warner Music Group 5.40% Hold 1,792,733 $42.74 $77M
SFM, Sprout Social 5.11% Hold 593,625 $121.95 $72M
GTM, Zoominfo Technologies 4.25% Hold 984,002 $61.19 $60M
DOCN, Digitalocean 3.88% Hold 709,435 $77.63 $55M
GDDY, Godaddy 3.62% Hold 736,239 $69.70 $51M
MANH, Manhattan Associates 3.45% Hold 319,706 $153.03 $49M
IDCC, Interdigital 3.38% Hold 706,089 $67.82 $48M
UBER, Uber 3.36% Hold 1,062,000 $44.80 $48M
Holding 2.76% Hold 242,326 $161.31 $39M
COUR, Coursera 2.68% Hold 1,201,635 $31.65 $38M
Holding 2.50% Hold 1,679,119 $21.10 $35M
ADSK, Autodesk 2.38% Hold 118,247 $285.17 $34M
AMBA, Ambarella 2.33% Hold 212,557 $155.74 $33M
NYT, New York Times 2.24% Hold 643,446 $49.27 $32M
SONO, Sonos 1.95% Hold 854,962 $32.36 $28M
PRTS, Carparts 1.49% Hold 1,355,632 $15.61 $21M
Lightspeed Pos 1.43% Hold 210,000 $96.43 $20M
Smartsheet 1.40% Hold 287,983 $68.82 $20M
Pegasystems 1.20% Hold 134,411 $127.10 $17M
RMBS, Rambus 1.16% Hold 737,973 $22.20 $16M
Silicon Laboratories 1.02% Hold 103,000 $140.16 $14M
TCOM, Tripadvisor 0.99% Hold 414,188 $33.85 $14M
ACVA, Acv Auctions 0.90% Hold 714,355 $17.89 $13M
Holding 0.88% Hold 1,275,351 $9.82 $13M
RUN, Sunrun 0.88% Hold 282,150 $44.00 $12M
TTWO, Take-Two Interactive 0.69% Hold 63,500 $154.06 $9.8M
Zynga 0.64% Hold 1,196,800 $7.53 $9M
IAC, IAC Interactivecorp 0.62% Hold 67,949 $130.29 $8.9M
Supernova Partners Acquistn 0.42% Hold 600,000 $9.95 $6M
EVTC, Evertec 0.39% Hold 120,564 $45.72 $5.5M
Cascade Acquisition 0.35% Hold 500,000 $9.98 $5M
Macondray Cap Acquisitn 0.33% Hold 475,000 $9.98 $4.7M
Instructure 0.29% Hold 182,363 $22.59 $4.1M
RSVR, Reservoir Media 0.25% Hold 383,417 $9.11 $3.5M
890 5th Ave Partners 0.21% Hold 300,000 $9.91 $3M
Holding 0.17% Hold 250,000 $9.88 $2.5M
Holding 0.14% Hold 200,000 $9.78 $2M
SNAP 0.10% Hold 19,039 $73.85 $1.4M
WDAY, Workday 0.07% Hold 4,128 $250.00 $1M
TEAM, Atlassian 0.04% Hold 1,626 $391.14 $636K
Ion Acquisition Corporation 2 0.01% Hold 20,000 $10.00 $200K
Class Acceleration 0.00% Hold 5,000 $9.80 $49K
Holding 0.00% Hold 1,000 $10.00 $10K

* 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). Click a column header to sort, or New, Hold, Add or Reduce to bring those moves to the top.

Filings history

20 periods, with AUM normalized

Newest 13Fs
Period Holds 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 to 2026 Q2

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

Further reading

As an Amazon Associate, FollowTheFilings earns from qualifying purchases.

  • The Essays of Warren Buffett, 8th Ed., Warren Buffett, Lawrence A. Cunningham View on Amazon
  • One Up On Wall Street (Lynch), Peter Lynch View on Amazon

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