Shannon River Fund Management LLC
SEC Form 13F institutional filer · CIK 0001301050
13F-HR · 11 reported holdings · 2026-03-31
Reported long-US-equity value
$0.23B
Top-10 concentration
98.1%
Shannon River Fund Management LLC — $228M AUM allocation strategy
Shannon River Fund Management LLC files SEC Form 13F and reports $228M of long US equity value across 11 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 50.8%, followed by Communication Services 22.2% and Consumer Discretionary 13.7%.
The top 10 holdings account for 98% of reported value — a conviction-weighted book concentrated in its best ideas. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
Shannon River Fund Management LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$228M
total across 11 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
98% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$MRVL +186K sh · +$23.7M+$LYV +39K sh · +$8.5M+$AXON +26.7K sh · +$8.38M
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Semiconductors24.5%—
- Movies & Entertainment19.7%—
- Hotels, Resorts & Cruise Lines13.7%—
- Electronic Components9.2%—
- Electronic Manufacturing Services8.9%—
- Aerospace & Defense8.8%—
- Communications Equipment6.4%—
- Data Center REITs4.5%—
- Other holdings4.3%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
10 of 10 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $MRVL | Marvell Technology Inc | 564K | $55.8M | +186K | 24.5% |
| $LYV | Live Nation Entertainment Inc | 294K | $44.9M | +39K | 19.7% |
| $ABNB | Airbnb Inc | 247K | $31.2M | — | 13.7% |
| $COHR | Coherent Corp | 87.9K | $20.9M | -80K | 9.2% |
| $FLEX | Flex Ltd | 311K | $20.4M | -2.05K | 8.9% |
| $AXON | Axon Enterprise Inc | 47.4K | $20.1M | +26.7K | 8.8% |
| $FFIV | F5 Inc | 50.2K | $14.5M | — | 6.4% |
| $APP | Applovin Corporation | 14.5K | $5.76M | — | 2.5% |
| $DLR | Digital Realty Trust Inc | 29.8K | $5.38M | — | 2.4% |
| $EQIX | Equinix Inc. Common Stock REIT | 5.1K | $5M | — | 2.2% |
…and 1 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
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How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
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