Shannon River Fund Management LLC
CIK 1301050 · View on SEC EDGAR ↗
- Portfolio value
- $1.1B
- Positions
- 37
- As of
- June 30, 2026
#2,268 of 9,443 by 13F value · top 24.0%
Portfolio value QoQ: +113.8% 13F does not disclose cash
- Top 10 holdings weight
- 49.63%
- Top 25 holdings weight
- 89.52%
- Positions above 1%
- 31
- Effective number of positions
- 25.5
Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)
Turnover Q2 2026: 27.47% Est. buys $647,279,224 · sells $225,838,892
Median holding: 1.0 quarters Tracked Q4 2024–Q2 2026 · 43.5% still held
- New positions
- 22
- Increased
- 12
- Decreased
- 3
- Closed
- 13
On this page
- Performance vs S&P How this manager's 13F portfolio performed against the S&P 500.
- Sector breakdown How the portfolio splits across market sectors.
- Portfolio Every stock this institution reports holding, from its latest 13F.
- Biggest new bets Brand-new positions opened in the latest quarter.
- Top moves The biggest position increases and decreases this quarter.
- Exited positions Positions the manager fully sold out of last quarter.
Performance vs S&P 500
Annualized: +89.8% · S&P 500: +28.7%
Approximates a buy-and-hold portfolio built from quarterly SEC 13F snapshots. Excludes cash, short positions, options/derivatives, and non-13(f) securities — reflects the disclosed long-equity book only, not total fund AUM. SEC filing lag is up to 45 days; this is not a real-time-copyable timing.
Priceable coverage: 99.7% · Options excluded: 3.5%
Sector breakdown
Technology
37.9%
Industrials
24.4%
Communications
11.8%
Communication Services
9.2%
Health Care
4.2%
Diversified Consumer Services
3.4%
Consumer Discretionary
3.2%
Real Estate
1.4%
Retail
1.1%
Other/Unmapped
3.4%
Full portfolio 37 positions
| Type | Streak | 8Q trend | |||||
|---|---|---|---|---|---|---|---|
| TSEM Tower Semiconductor Ltd. - Ordinary Shares | $99,807,657 | 8.91% | 382,933 | $11,323,797 | Down ×4 | ||
| FLEX Flex Ltd. - Ordinary Shares | $61,559,696 | 5.49% | 379,834 | $41,187,038 | Up ×1 | ||
| AMD Advanced Micro Devices, Inc. - Common Stock | $61,431,813 | 5.48% | 105,751 | Up ×1 | |||
| IDCC InterDigital, Inc. - Common Stock | $52,205,774 | 4.66% | 184,388 | $35,866,366 | Up ×2 | ||
| CLS Celestica, Inc. Common Stock | $51,058,867 | 4.56% | 139,964 | $35,990,395 | Up ×1 | ||
| COHR Coherent Corp. Common Stock | $50,998,265 | 4.55% | 129,283 | $30,058,415 | Up ×1 | ||
| HNGE Hinge Health, Inc. Class A Common Stock | $46,581,592 | 4.16% | 561,224 | $30,495,054 | Up ×2 | ||
| EXTR Extreme Networks, Inc. - Common Stock | $46,097,955 | 4.11% | 1,424,095 | $26,296,995 | Up ×1 | ||
| KLIC Kulicke and Soffa Industries, Inc. - Common Stock | $44,780,307 | 4.00% | 334,781 | Up ×1 | |||
| TWLO Twilio Inc. Class A Common Stock | $41,544,958 | 3.71% | 201,352 | Up ×1 | |||
| CIEN Ciena Corporation Common Stock | $39,881,547 | 3.56% | 81,298 | Up ×1 | |||
| LYV Live Nation Entertainment, Inc. Common Stock | $39,558,535 | 3.53% | 216,037 | $-5,340,104 | Down ×1 | ||
| RMBS Rambus, Inc. - Common Stock | $38,721,984 | 3.46% | 291,713 | $10,003,708 | Down ×1 | ||
| Unknown issuer (CUSIP: 74768A104) | $38,365,078 | 3.42% | 469,355 | Up ×1 | |||
| UTI Universal Technical Institute Inc Common Stock | $38,070,133 | 3.40% | 890,113 | Up ×1 | |||
| ABNB Airbnb, Inc. - Class A Common Stock | $35,465,332 | 3.17% | 247,836 | $4,273,414 | Up ×1 | ||
| TTWO Take-Two Interactive Software, Inc. - Common Stock | $34,504,489 | 3.08% | 138,029 | Up ×1 | |||
| OUST Ouster, Inc. - Common Stock | $28,087,985 | 2.51% | 449,264 | Up ×1 | |||
| PDFS PDF Solutions, Inc. - Common Stock | $26,176,443 | 2.34% | 369,776 | Up ×1 | |||
| NOK Nokia Corporation Sponsored American Depositary Shares | $25,323,659 | 2.26% | 1,906,902 | Up ×1 | |||
| ALNT Allient Inc. - Common Stock | $22,668,994 | 2.02% | 220,237 | Up ×1 | |||
| RKLB Rocket Lab Corporation - Common Stock | $22,479,186 | 2.01% | 221,143 | Up ×1 | |||
| FFIV F5, Inc. - Common Stock | $21,321,278 | 1.90% | 51,258 | $6,798,069 | Up ×1 | ||
| DY Dycom Industries, Inc. Common Stock | $19,957,154 | 1.78% | 39,473 | Up ×1 | |||
| CIFR Cipher Mining Inc. - Common Stock | $16,364,310 | 1.46% | 667,931 | Up ×1 | |||
| LION Lionsgate Studios Corp Common Shares | $16,082,313 | 1.44% | 1,050,445 | $6,099,756 | Up ×1 | ||
| DLR Digital Realty Trust, Inc. Common Stock | $15,940,239 | 1.42% | 88,764 | $10,563,133 | Up ×1 | ||
| GWRE Guidewire Software, Inc. Common Stock | $13,932,952 | 1.24% | 113,230 | $4,531,162 | Up ×1 | ||
| SPHR Sphere Entertainment Co. Class A Common Stock | $12,783,110 | 1.14% | 73,878 | $4,172,407 | Up ×1 | ||
| GLBE Global-E Online Ltd. - ordinary shares | $12,266,636 | 1.09% | 353,200 | Up ×1 | |||
| AMPX Amprius Technologies, Inc. Common Stock | $11,626,974 | 1.04% | 838,887 | Up ×1 | |||
| APLD Applied Digital Corporation - Common Stock | $9,902,180 | 0.88% | 265,474 | Up ×1 | |||
| NET Cloudflare, Inc. Class A Common Stock | $5,785,910 | 0.52% | 23,589 | Up ×1 | |||
| AMKR Amkor Technology, Inc. - Common Stock | $5,682,126 | 0.51% | 65,895 | Up ×1 | |||
| MU Micron Technology, Inc. - Common Stock | $5,175,836 | 0.46% | 4,484 | ||||
| BW Babcock & Wilcox Enterprises, Inc. Common Stock | $4,697,457 | 0.42% | 333,153 | Up ×1 | |||
| MXL MaxLinear, Inc - Common Stock | $3,505,077 | 0.31% | 27,377 | Up ×1 | |||
| No matches | |||||||
Biggest new bets
New positions opened this quarter, largest first.
| Security | Value | Shares | % of portfolio |
|---|---|---|---|
| AMD | $61,431,813 | 105,751 | 5.48% |
| KLIC | $44,780,307 | 334,781 | 4.00% |
| TWLO | $41,544,958 | 201,352 | 3.71% |
| CIEN | $39,881,547 | 81,298 | 3.56% |
| Unknown issuer (CUSIP: 74768A104) | $38,365,078 | 469,355 | 3.42% |
| UTI | $38,070,133 | 890,113 | 3.40% |
| TTWO | $34,504,489 | 138,029 | 3.08% |
| OUST | $28,087,985 | 449,264 | 2.51% |
| PDFS | $26,176,443 | 369,776 | 2.34% |
| NOK | $25,323,659 | 1,906,902 | 2.26% |
| ALNT | $22,668,994 | 220,237 | 2.02% |
| RKLB | $22,479,186 | 221,143 | 2.01% |
| DY | $19,957,154 | 39,473 | 1.78% |
| CIFR | $16,364,310 | 667,931 | 1.46% |
| GLBE | $12,266,636 | 353,200 | 1.09% |
Top movers (QoQ)
| Security | Action | Shares Δ | Value Δ |
|---|---|---|---|
| FLEX | Bought more | +69K | +$41.2M |
| CLS | Bought more | +86K | +$36.0M |
| IDCC | Bought more | +130K | +$35.9M |
| HNGE | Bought more | +144K | +$30.5M |
| COHR | Bought more | +41K | +$30.1M |
| EXTR | Bought more | +111K | +$26.3M |
| TSEM | Trimmed | -121K | +$11.3M |
| DLR | Bought more | +59K | +$10.6M |
| RMBS | Trimmed | -42K | +$10.0M |
| FFIV | Bought more | +1K | +$6.8M |
Exited positions
Includes corporate events (mergers, delistings) — not all exits are sells
Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.
| Security | Quarter | Shares before | Value before | Price since exit |
|---|---|---|---|---|
| SPY | March 31, 2025 | 150,000 | $87,912,000 | No longer tracked |
| IWM | Sept. 30, 2025 | 300,000 | $64,737,000 | No longer tracked |
| PEGA | March 31, 2026 | 1,038,832 | $62,039,047 | -22.0% |
| MRVL | June 30, 2026 | 563,573 | $55,821,906 | -17.3% |
| U | March 31, 2026 | 1,065,452 | $47,061,015 | 110.1% |
| FROG | Dec. 31, 2025 | 863,924 | $40,889,523 | 38.5% |
| FORM | Dec. 31, 2025 | 968,161 | $35,260,424 | 107.2% |
| QRVO | June 30, 2025 | 443,100 | $32,084,871 | 13.5% |
| CWAN | March 31, 2026 | 1,236,412 | $29,822,258 | No longer tracked |
| NCNO | March 31, 2026 | 1,135,922 | $29,125,040 | 34.2% |
| CLH | Dec. 31, 2025 | 115,870 | $26,907,332 | 35.7% |
| AFRM | Sept. 30, 2025 | 356,563 | $24,652,766 | 3.2% |
| KVYO | March 31, 2026 | 729,703 | $23,693,457 | -7.9% |
| PYPL | March 31, 2025 | 269,470 | $22,999,265 | -4.7% |
| CRDO | March 31, 2026 | 149,966 | $21,578,608 | 146.6% |
| CART | Sept. 30, 2025 | 453,988 | $20,538,417 | 36.7% |
| AXON | June 30, 2026 | 47,442 | $20,148,143 | 8.6% |
| BL | March 31, 2025 | 326,313 | $19,826,778 | -35.4% |
| TOST | June 30, 2026 | 732,027 | $19,406,036 | 28.1% |
| LGN | June 30, 2026 | 337,638 | $19,063,042 | -29.2% |
| GPN | March 31, 2025 | 158,356 | $17,745,373 | -5.4% |
| INFA | March 31, 2025 | 622,431 | $16,139,636 | No longer tracked |
| ESTC | Sept. 30, 2025 | 184,355 | $15,546,657 | -0.3% |
| ADTN | June 30, 2026 | 1,219,976 | $15,347,298 | -43.3% |
| LRN | Dec. 31, 2025 | 82,928 | $12,351,297 | 29.3% |
| MIR | Sept. 30, 2025 | 555,377 | $11,957,267 | -34.5% |
| DOCU | March 31, 2026 | 156,813 | $10,726,009 | 28.5% |
| CFLT | March 31, 2025 | 359,019 | $10,038,171 | No longer tracked |
| TALK | March 31, 2025 | 3,226,598 | $9,970,188 | 105.1% |
| U | Sept. 30, 2025 | 405,534 | $9,813,923 | 15.1% |
| UUUU | June 30, 2026 | 507,555 | $9,262,879 | No longer tracked |
| NATL | Sept. 30, 2025 | 307,366 | $8,769,152 | 18.8% |
| CCC | March 31, 2026 | 1,075,546 | $8,550,591 | 23.3% |
| ZM | June 30, 2025 | 108,779 | $8,024,627 | 35.8% |
| QCOM | March 31, 2026 | 46,212 | $7,904,563 | 25.0% |
| AMBA | June 30, 2026 | 114,940 | $5,916,536 | -14.8% |
| MU | March 31, 2026 | 20,400 | $5,822,364 | 191.5% |
| APP | June 30, 2026 | 14,480 | $5,763,040 | -41.6% |
| ALAB | June 30, 2026 | 47,394 | $5,194,383 | -40.0% |
| OSIS | June 30, 2026 | 19,274 | $5,117,440 | -10.9% |
| EQIX | June 30, 2026 | 5,102 | $5,001,184 | 5.1% |
| WIX | March 31, 2026 | 46,731 | $4,854,883 | -10.8% |
| PGY | Sept. 30, 2025 | 204,171 | $4,352,926 | -29.3% |
| PLTR | June 30, 2026 | 29,150 | $4,264,062 | 48.3% |
| SNOW | June 30, 2026 | 26,377 | $3,978,179 | 24.1% |
| TSM | Dec. 31, 2025 | 8,701 | $2,430,102 | 38.3% |
| BLZE | Dec. 31, 2025 | 229,384 | $2,128,684 | 235.0% |
| DOCU | March 31, 2025 | 10,000 | $899,400 | -25.1% |