American Trust Investment Advisors, LLC
SEC Form 13F institutional filer · CIK 0001291424
13F-HR · 41 reported holdings · 2026-03-31
Reported long-US-equity value
$0.13B
Top-10 concentration
55.1%
American Trust Investment Advisors, LLC — $129M AUM allocation strategy
American Trust Investment Advisors, LLC files SEC Form 13F and reports $129M of long US equity value across 41 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 26.9%, followed by Financials 19.7% and Consumer Staples 9.2%.
The top 10 holdings account for 55% 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.
American Trust Investment Advisors, LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$129M
total across 41 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
55% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$MDLZ +2K sh · +$349K+$C +1.58K sh · +$16K+$ACN +1.02K sh · −$1.13M
Biggest trims (shares)
−$LRCX −15K sh · −$1.2M−$BG −2.25K sh · +$2.26M−$CEG −1.74K sh · −$1.98M
Exited to nil (held last quarter, gone now)
$URI ($1.78M last qtr)$ALB ($322K last qtr)$GOOGL ($250K 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)
- Multi-Sector Holdings10.1%—
- Interactive Media & Services8.1%—
- Electric Utilities7.8%—
- IT Consulting & Other Services7.5%—
- Technology Hardware, Storage & Peripherals6.6%—
- Agricultural Products & Services6.3%—
- Semiconductor Materials & Equipment5.4%—
- Investment Banking & Brokerage5.2%—
- Other holdings43.1%—
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 |
|---|---|---|---|---|---|
| $BRK.B | Berkshire Hathaway Inc.-Class B | 27.2K | $13M | +73 | 10.1% |
| $AAPL | Apple Inc | 33.4K | $8.49M | -599 | 6.6% |
| $BG | Bunge Limited | 64.5K | $8.21M | -2.25K | 6.4% |
| $LRCX | Lam Research Corporation | 32.1K | $6.87M | -15K | 5.3% |
| $SCHW | Charles Schwab Corporation | 120K | $6.67M | -565 | 5.2% |
| $C | Citigroup Inc | 51.5K | $5.84M | +1.58K | 4.5% |
| $MSFT | Microsoft Corporation | 15.6K | $5.79M | +185 | 4.5% |
| $IBM | International Business Machines Corporation | 23.8K | $5.76M | +62 | 4.5% |
| $META | Meta Platforms Inc | 9.31K | $5.32M | -162 | 4.1% |
| $CEG | Constellation Energy Corporation | 18.5K | $5.16M | -1.74K | 4.0% |
…and 31 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
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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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