Marathon Trading Investment Management LLC
SEC Form 13F institutional filer · CIK 0001572748
13F-HR · 49 reported holdings · 2026-03-31
Reported long-US-equity value
$0.18B
Top-10 concentration
90.8%
Marathon Trading Investment Management LLC — $182M AUM allocation strategy
Marathon Trading Investment Management LLC files SEC Form 13F and reports $182M of long US equity value across 49 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 62.3%, followed by Consumer Discretionary 13.5% and Financials 4.1%.
The top 10 holdings account for 91% 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.
Marathon Trading Investment Management LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$182M
total across 49 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
91% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$MSFT +144K sh · +$46.1M+$AVGO +44.4K sh · +$13.5M+$ORCL +38.8K sh · +$5.34M
Biggest trims (shares)
−$NVDA −641K sh · −$120M−$AMZN −252K sh · −$58.1M−$AAPL −245K sh · −$66.7M
Exited to nil (held last quarter, gone now)
$WBD ($14.6M last qtr)$DECK ($1.55M last qtr)$CNC ($1.54M last qtr)$LULU ($1.51M last qtr)$STZ ($1.44M 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 Software41.8%—
- Semiconductors15.9%—
- Automobile Manufacturers12.8%—
- Application Software4.6%—
- Aerospace & Defense2.4%—
- Diversified Banks1.7%—
- Managed Health Care1.4%—
- Financial Exchanges & Data1.4%—
- Other holdings18.0%—
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
9 of 9 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $MSFT | Microsoft Corporation | 206K | $76.1M | +144K | 41.8% |
| $TSLA | Tesla Inc | 62.5K | $23.2M | -46K | 12.7% |
| $AVGO | Broadcom Inc | 51.4K | $15.9M | +44.4K | 8.7% |
| $NVDA | NVIDIA Corporation | 64.4K | $11.2M | -641K | 6.2% |
| $ORCL | Oracle Corporation | 46.6K | $6.86M | +38.8K | 3.8% |
| $BA | Boeing Company | 21.7K | $4.32M | +17.9K | 2.4% |
| $BAC | Bank of America Corporation | 5.07K | $3.06M | -25.5K | 1.7% |
| $UNH | UnitedHealth Group Incorporated | 9.91K | $2.68M | +6.59K | 1.5% |
| $SPGI | S&P Global Inc | 22K | $1.43M | — | 0.8% |
…and 40 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
← 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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