Magnetar Financial LLC
SEC Form 13F institutional filer · CIK 0001352851
13F-HR · 147 reported holdings · 2026-03-31
Reported long-US-equity value
$0.60B
Top-10 concentration
73.8%
Magnetar Financial LLC — $596M AUM allocation strategy
Magnetar Financial LLC files SEC Form 13F and reports $596M of long US equity value across 147 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 26.0%, followed by Industrials 14.4% and Communication Services 13.7%.
The top 10 holdings account for 74% 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.
Magnetar Financial LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$596M
total across 147 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
74% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$MCHP +955K sh · +$54.5M+$HPE +433K sh · +$27.3M+$HST +24.5K sh · +$530K
Biggest trims (shares)
−$KVUE −658K sh · −$11.4M−$ARES −525K sh · −$31.8M−$NEE −273K sh · −$13.7M
Exited to nil (held last quarter, gone now)
$BA ($8.04M last qtr)$ADSK ($5.8M last qtr)$ROP ($4.6M last qtr)$MRSH ($4.56M last qtr)$VLO ($4.53M 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)
- Broadcasting13.7%—
- Personal Care Products13.3%—
- Rail Transportation13.0%—
- Semiconductors10.4%—
- Technology Hardware, Storage & Peripherals10.2%—
- Application Software5.0%—
- Asset Management & Custody Banks4.8%—
- Specialty Chemicals3.0%—
- Other holdings26.5%—
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 |
|---|---|---|---|---|---|
| $WBD | Warner Bros. Discovery Inc. Series A | 3.02M | $81.7M | -166K | 13.7% |
| $KVUE | Kenvue Inc | 4.61M | $79.4M | -658K | 13.3% |
| $NSC | Norfolk Southern Corporation | 275K | $77.7M | -68.8K | 13.0% |
| $HPE | Hewlett Packard Enterprise Company | 933K | $60.4M | +433K | 10.1% |
| $MCHP | Microchip Technology Incorporated | 1.03M | $58.9M | +955K | 9.9% |
| $ORCL | Oracle Corporation | 650K | $29.8M | — | 5.0% |
| $ALB | Albemarle Corporation | 250K | $18M | +0 | 3.0% |
| $APO | Apollo Global Management Inc | 250K | $14.7M | +0 | 2.5% |
| $ARES | Ares Management Corporation | 382K | $14M | -525K | 2.3% |
| $CMI | Cummins Inc | 48.2K | $4.78M | +3.1K | 0.8% |
…and 137 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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