Atika Capital Management LLC
SEC Form 13F institutional filer · CIK 0001599731
13F-HR · 14 reported holdings · 2026-03-31
Reported long-US-equity value
$0.36B
Top-10 concentration
94.1%
Atika Capital Management LLC — $361M AUM allocation strategy
Atika Capital Management LLC files SEC Form 13F and reports $361M of long US equity value across 14 reported holdings for 2026-03-31.
Its largest sector bet is Industrials 49.4%, followed by Health Care 17.8% and Communication Services 15.7%.
The top 10 holdings account for 94% 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.
Atika Capital Management LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$361M
total across 14 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
94% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$ECHO +57.2K sh · +$7.74M+$VRT +30K sh · +$63.9M+$STX +1.59K sh · +$6.66M
Biggest trims (shares)
−$AMZN −36.3K sh · −$9.36M−$CIEN −16.3K sh · +$2.91M−$GE −10.4K sh · −$3.59M
Exited to nil (held last quarter, gone now)
$TSLA ($13.5M last qtr)$DASH ($10.4M last qtr)$HOOD ($5.82M last qtr)$AXP ($4.52M last qtr)$CRM ($460K 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)
- Electrical Components & Equipment46.3%—
- Pharmaceuticals10.5%—
- Technology Hardware, Storage & Peripherals8.6%—
- Health Care Equipment7.3%—
- Wireless Telecommunication Services5.9%—
- Interactive Media & Services5.0%—
- Movies & Entertainment4.8%—
- Communications Equipment4.7%—
- Other holdings6.9%—
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 |
|---|---|---|---|---|---|
| $VRT | Vertiv Holdings LLC | 666K | $167M | +30K | 46.3% |
| $LLY | Eli Lilly and Company | 41.1K | $37.8M | +0 | 10.5% |
| $ISRG | Intuitive Surgical Inc | 57.2K | $26.4M | +0 | 7.3% |
| $ECHO | EchoStar Corporation | 182K | $21.3M | +57.2K | 5.9% |
| $STX | Seagate Technology Holdings PLC | 53.5K | $21M | +1.59K | 5.8% |
| $NFLX | Netflix Inc | 180K | $17.3M | +0 | 4.8% |
| $CIEN | Ciena Corporation | 43.7K | $16.9M | -16.3K | 4.7% |
| $GOOGL | Alphabet Inc | 43.3K | $12.4M | +1.05K | 3.4% |
| $WDC | Western Digital Corporation | 37.7K | $10.2M | — | 2.8% |
| $AMZN | Amazon.com Inc | 43.7K | $9.1M | -36.3K | 2.5% |
…and 4 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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