S.A. Mason LLC
SEC Form 13F institutional filer · CIK 0001800911
13F-HR · 157 reported holdings · 2026-03-31
Reported long-US-equity value
$0.19B
Top-10 concentration
39.3%
S.A. Mason LLC — $190M AUM allocation strategy
S.A. Mason LLC files SEC Form 13F and reports $190M of long US equity value across 157 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 16.2%, followed by Financials 4.8% and Consumer Staples 3.8%.
The top 10 holdings account for 39% of reported value — a broadly spread portfolio. 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.
S.A. Mason LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$190M
total across 157 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
39% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$FCX +7.89K sh · +$538K+$IVV +4.89K sh · +$1.26M+$PANW +3.78K sh · +$428K
Biggest trims (shares)
−$ORCL −6.11K sh · −$1.39M−$NVDA −1.85K sh · −$1.31M−$AMD −545 sh · −$134K
Exited to nil (held last quarter, gone now)
$CRM ($591K last qtr)$QCOM ($204K last qtr)$MDT ($104K 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)
- Semiconductors7.3%—
- Systems Software3.0%—
- Technology Hardware, Storage & Peripherals3.0%—
- Application Software2.9%—
- Consumer Staples Merchandise Retail2.6%—
- Transaction & Payment Processing Services2.6%—
- Investment Banking & Brokerage2.2%—
- Interactive Media & Services1.6%—
- Other holdings74.8%—
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
5 of 5 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $NVDA | NVIDIA Corporation | 79.7K | $13.9M | -1.85K | 7.3% |
| $MSFT | Microsoft Corporation | 15.5K | $5.74M | +169 | 3.0% |
| $AAPL | Apple Inc | 22.4K | $5.68M | +615 | 3.0% |
| $COST | Costco Wholesale Corporation | 5.01K | $4.99M | +5 | 2.6% |
| $SCHW | Charles Schwab Corporation | 152K | $4.26M | +1.22K | 2.2% |
…and 152 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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