Siren, L.L.C.
SEC Form 13F institutional filer · CIK 0002005245
13F-HR · 10 reported holdings · 2026-03-31
Reported long-US-equity value
$0.10B
Top-10 concentration
100.0%
Siren, L.L.C. — $98.6M AUM allocation strategy
Siren, L.L.C. files SEC Form 13F and reports $98.6M of long US equity value across 10 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 62.9%, followed by Communication Services 19.2% and Consumer Discretionary 17.9%.
The top 10 holdings account for 100% 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.
Siren, L.L.C. — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$98.6M
total across 10 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
100% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$NVDA +51.6K sh · +$8.55M+$NOW +51.5K sh · +$3.65M+$GOOG +45K sh · +$12.4M
Exited to nil (held last quarter, gone now)
$BNY ($50.3M last qtr)$CRM ($6.91M last qtr)$META ($4.73M last qtr)$ADBE ($4.22M last qtr)$QCOM ($2.39M last qtr)
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)
- Systems Software33.9%—
- Semiconductors22.5%—
- Interactive Media & Services19.2%—
- Broadline Retail9.8%—
- Automobile Manufacturers8.1%—
- Application Software6.5%—
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 |
|---|---|---|---|---|---|
| $GOOG | Alphabet Inc. Class C Capital Stock | 65.7K | $18.9M | +45K | 19.2% |
| $NVDA | NVIDIA Corporation | 89.1K | $15.5M | +51.6K | 15.7% |
| $MSFT | Microsoft Corporation | 41.4K | $15.3M | +26.4K | 15.5% |
| $AMZN | Amazon.com Inc | 46.6K | $9.71M | -4.86K | 9.8% |
| $NOW | ServiceNow Inc | 87.1K | $9.11M | +51.5K | 9.2% |
| $CRWD | CrowdStrike Holdings Inc | 23.1K | $9.01M | +6.57K | 9.1% |
| $TSLA | Tesla Inc | 21.5K | $7.99M | +20K | 8.1% |
| $DDOG | Datadog Inc | 54.3K | $6.41M | +17.9K | 6.5% |
| $AVGO | Broadcom Inc | 15K | $4.64M | +8K | 4.7% |
| $MU | Micron Technology Inc | 6K | $2.03M | — | 2.1% |
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
← All 13F filers·← QuantOrb.pro
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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