Shannon River Fund Management portfolio
Concentrated managerInvestment firmPortfolio as of Jun 30, 2026 (Q2 2026) · filed with the SEC on Aug 13, 2026 · data updated on Nov 5, 2026 · Q2 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Shannon River Fund Management reported a $1.1 bn portfolio of 37 positions to the SEC as of the end of Q2 2026. Its largest positions are TSEM, FLEX, AMD. During the quarter it opened Advanced Micro Devices and Kulicke and Soffa Industries and exited Marvell Technology.
Sections with a free account
What changed this quarter
46 positions with a change (21 new, 9 added to, 3 trimmed, 13 sold); also, 1 entered through an IPO. 12 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Newly listedQuantinuumQNT3.4% of the portfolio
It started trading this quarter: it appears in a 13F for the first time. The filing does not say whether the manager already held it before the listing, so it is not counted as a purchase.
- Advanced Micro Devices+5.5 ppof portfolioNew— → 5.5%
- Marvell Technology−5.0 ppof portfolioSold out10.7% → —
- Kulicke and Soffa Industries+4.0 ppof portfolioNew— → 4.0%
- Twilio+3.7 ppof portfolioNew— → 3.7%
- Ciena+3.6 ppof portfolioNew— → 3.6%
- Universal Technical Institute+3.4 ppof portfolioNew— → 3.4%
- Interdigital+241%more sharesIncreased3.1% → 4.7%
- Take-two Interactive Software+3.1 ppof portfolioNew— → 3.1%
- Tower Semiconductor−24%fewer sharesReduced16.9% → 8.9%
- Celestica+162%more sharesIncreased2.9% → 4.6%
- Ouster+2.5 ppof portfolioNew— → 2.5%
- PDF Solutions+2.3 ppof portfolioNew— → 2.3%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- Tower SemiconductorTSEM8.9%
- FLEXFLEX5.5%
- Advanced Micro DevicesAMD5.5%
- InterdigitalIDCC4.7%
- CelesticaCLS4.6%
- CoherentCOHR4.6%
- Hinge HealthHNGE4.2%
- Extreme NetworksEXTR4.1%
- Kulicke and Soffa IndustriesKLIC4.0%
- TwilioTWLO3.7%
- CienaCIEN3.6%
- Live Nation EntertainmentLYV3.5%
- RambusRMBS3.5%
- QuantinuumQNT3.4%
- Universal Technical InstituteUTI3.4%
“Since”: first quarter of the current run, unbroken until today. In the details, prices are the quarter-end prices of the quarters in which it added shares, per the 13F. The manager may have bought at any price within each quarter; the SEC only publishes the value at quarter end.
Portfolio by sector
- ● Information Technology 70%
- ● Communication Services 9%
- ● Industrials 9%
- ● Consumer Discretionary 7%
- ● Health Care 4%
- ● Real Estate 1%
How its portfolio changed (8 quarters)
Q2 2026: 37
Q2 2026: 50%
Q2 2026: 38.9%
Traded turnover: the weight it bought plus the weight it sold in the quarter, divided by two, excluding price moves. The plain “turnover” in the header does include that effect. With a free account: the full history and sectors over time.
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Investment firm, per its Form ADV of Jul 2, 2026 (high confidence).
The data, as reported: SHANNON RIVER FUND MANAGEMENT, LLC (CRD 161538): 7.B private funds: 2 hedge (gross assets $750M); 5.D assets by client type: pooled vehicles 100% (of $905M)
The type comes from a rule applied to that data. If it looks wrong, tell us.
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