East Coast Asset Management, LLC.
SEC Form 13F institutional filer · CIK 0001579254
13F-HR · 55 reported holdings · 2026-03-31
Reported long-US-equity value
$0.25B
Top-10 concentration
76.6%
East Coast Asset Management, LLC. — $250M AUM allocation strategy
East Coast Asset Management, LLC. files SEC Form 13F and reports $250M of long US equity value across 55 reported holdings for 2026-03-31.
Its largest sector bet is Communication Services 28.8%, followed by Consumer Discretionary 22.7% and Financials 16.4%.
The top 10 holdings account for 77% 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.
East Coast Asset Management, LLC. — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$250M
total across 55 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
77% of value
higher = narrower conviction; lower = spread / hedging
Biggest trims (shares)
−$GOOGL −30.2K sh · −$13.9M−$META −7.64K sh · −$6.29M−$AMZN −936 sh · −$1.56M
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)
- Interactive Media & Services22.3%—
- Automobile Manufacturers14.8%—
- Aerospace & Defense11.6%—
- Transaction & Payment Processing Services6.5%—
- Wireless Telecommunication Services6.4%—
- Multi-Sector Holdings5.8%—
- Broadline Retail4.9%—
- Technology Hardware, Storage & Peripherals3.9%—
- Other holdings23.6%—
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 |
|---|---|---|---|---|---|
| $GOOGL | Alphabet Inc | 166K | $47.6M | -30.2K | 19.1% |
| $TSLA | Tesla Inc | 99.9K | $37.1M | +18.3K | 14.9% |
| $TDG | Transdigm Group Incorporated | 23.2K | $26.9M | -121 | 10.8% |
| $ECHO | EchoStar Corporation | 137K | $16.1M | +0 | 6.4% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 30.2K | $14.5M | -428 | 5.8% |
| $AMZN | Amazon.com Inc | 59.5K | $12.4M | -936 | 5.0% |
| $MA | Mastercard Incorporated | 22.9K | $11.4M | -359 | 4.6% |
| $AAPL | Apple Inc | 38.7K | $9.82M | -906 | 3.9% |
| $META | Meta Platforms Inc | 14.2K | $8.13M | -7.64K | 3.3% |
| $TJX | TJX Companies Inc | 45K | $7.19M | -615 | 2.9% |
…and 45 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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