Follow The Filings

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%

Spencer Waxman's biggest moves in 2026 Q2 were opening Advanced Micro Devices and Kulicke & Soffa Industries, adding to Airbnb and Celestica, trimming Tower Semiconductor and Live Nation Entertainment, and selling out of Marvell Technology and Axon Enterprise.

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

Latest book

2026 Q2 2026 Q1, filed 13 Aug, long equity only

Download CSV Download Excel All activity
TSEM, Tower Semiconductor 8.91%, was 16.88% Reduce −24.1% 382,933 $260.64 $100M −121,306 +$11M
FLEX, Flextronics 5.49%, was 3.89% Add +22.0% 379,834 $162.07 $62M +68,611 +$41M
AMD, Advanced Micro Devices 5.48% New 105,751 $580.91 $61M +105,751 +$61M
IDCC, Interdigital 4.66%, was 3.12% Add +240.8% 184,388 $283.13 $52M +130,284 +$36M
CLS, Celestica 4.56%, was 2.88% Add +161.6% 139,964 $364.80 $51M +86,469 +$36M
COHR, Coherent 4.55%, was 4.00% Add +47.1% 129,283 $394.47 $51M +41,378 +$30M
HNGE 4.16%, was 3.07% Add +34.5% 561,224 $83.00 $47M +144,042 +$30M
EXTR, Extreme Networks 4.11%, was 3.78% Add +8.5% 1,424,095 $32.37 $46M +111,034 +$26M
KLIC, Kulicke & Soffa Industries 4.00% New 334,781 $133.76 $45M +334,781 +$45M
TWLO, Twilio 3.71% New 201,352 $206.33 $42M +201,352 +$42M
CIEN, Ciena 3.56% New 81,298 $490.56 $40M +81,298 +$40M
LYV, Live Nation Entertainment 3.53%, was 8.57% Reduce −26.6% 216,037 $183.11 $40M −78,361 −$5.3M
RMBS, Rambus 3.46%, was 5.48% Reduce −12.6% 291,713 $132.74 $39M −42,104 +$10M
QNT, Quantinuum 3.42% New 469,355 $81.74 $38M +469,355 +$38M
UTI, Universal Technical Inst 3.40% New 890,113 $42.77 $38M +890,113 +$38M
ABNB, Airbnb 3.17% Add +0.3% 247,836 $143.10 $35M +830 +$4.3M
TTWO, Take-Two Interactive 3.08% New 138,029 $249.98 $35M +138,029 +$35M
Ouster 2.51% New 449,264 $62.52 $28M +449,264 +$28M
PDF Solutions 2.34% New 369,776 $70.79 $26M +369,776 +$26M
NOK, Nokia 2.26% New 1,906,902 $13.28 $25M +1,906,902 +$25M
ALNT, Allient 2.02% New 220,237 $102.93 $23M +220,237 +$23M
RKLB, Rocket Lab 2.01% New 221,143 $101.65 $22M +221,143 +$22M
FFIV, F5 1.90% Add +2.1% 51,258 $415.96 $21M +1,062 +$6.8M
DY, Dycom Industries 1.78% New 39,473 $505.59 $20M +39,473 +$20M
CIFR, Cipher Digital 1.46% New 667,931 $24.50 $16M +667,931 +$16M
LION, Lionsgate Studios 1.44% Add +0.9% 1,050,445 $15.31 $16M +9,511 +$6.1M
DLR, Digital Realty 1.42%, was 1.03% Add +197.5% 88,764 $179.58 $16M +58,926 +$11M
GWRE, Guidewire Software 1.24% Add +80.1% 113,230 $123.05 $14M +50,367 +$4.5M
SPHR, Sphere Entertainment 1.14% Add +0.7% 73,878 $173.03 $13M +533 +$4.2M
GLBE, Global-E Online 1.09% New 353,200 $34.73 $12M +353,200 +$12M
AMPX, Amprius Technologies 1.04% New 838,887 $13.86 $12M +838,887 +$12M
APLD, Applied Digital 0.88% New 265,474 $37.30 $9.9M +265,474 +$9.9M
NET, Cloudflare 0.52% New 23,589 $245.28 $5.8M +23,589 +$5.8M
AMKR, Amkor Technology 0.51% New 65,895 $86.23 $5.7M +65,895 +$5.7M
MU, Micron Technology 0.46% New 4,484 $1,154 $5.2M +4,484 +$5.2M
BW 0.42% New 333,153 $14.10 $4.7M +333,153 +$4.7M
Maxlinear 0.31% New 27,377 $128.03 $3.5M +27,377 +$3.5M

Exits / last held

Gone since 2026 Q1, shown at their last reported size.

Stock % of portfolio Recent activity Shares Reported price* Value Share change $ change
MRVL, Marvell Technology 10.65% Exit 0 $99.05 $56M −563,573 −$56M
AXON, Axon Enterprise 3.84% Exit 0 $424.69 $20M −47,442 −$20M
TOST, Toast 3.70% Exit 0 $26.51 $19M −732,027 −$19M
LGN, Legence 3.64% Exit 0 $56.46 $19M −337,638 −$19M
ADTN, Adtran 2.93% Exit 0 $12.58 $15M −1,219,976 −$15M
UUUU, Energy Fuels 1.77% Exit 0 $18.25 $9.3M −507,555 −$9.3M
AMBA, Ambarella 1.13% Exit 0 $51.48 $5.9M −114,940 −$5.9M
APP, AppLovin 1.10% Exit 0 $398.00 $5.8M −14,480 −$5.8M
ALAB, Astera Labs 0.99% Exit 0 $109.59 $5.2M −47,394 −$5.2M
OSIS, Osi Systems 0.98% Exit 0 $265.49 $5.1M −19,274 −$5.1M
EQIX, Equinix 0.95% Exit 0 $980.20 $5M −5,102 −$5M
PLTR, Palantir 0.81% Exit 0 $146.28 $4.3M −29,150 −$4.3M
SNOW, Snowflake 0.76% Exit 0 $150.81 $4M −26,377 −$4M

Weight bar: held both quarters added sold at this quarter’s reported price

* 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 2026 Q1. Click a column header to sort, or New, Hold, Add or Reduce to bring those moves to the top. Exit opens the last-held block below.

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

More on the shelf