S&CO INC
SEC Form 13F institutional filer · CIK 0001082461
13F-HR · 131 reported holdings · 2026-03-31
Reported long-US-equity value
$0.00B
Top-10 concentration
50.1%
S&CO INC — $1.24M AUM allocation strategy
S&CO INC files SEC Form 13F and reports $1.24M of long US equity value across 131 reported holdings for 2026-03-31.
Its largest sector bet is Health Care 12.1%, followed by Information Technology 10.5% and Industrials 10.3%.
The top 10 holdings account for 50% 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.
S&CO INC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$1.24M
total across 131 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
50% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$PYPL +99.6K sh · −$40+$MSFT +17.9K sh · −$12.9K+$INTU +7.6K sh · +$1.69K
Biggest trims (shares)
−$ABT −27K sh · −$7.9K−$MOS −10.2K sh · +$1.11K−$CTSH −10K sh · −$1.46K
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)
- Pharmaceuticals8.8%—
- Integrated Oil & Gas7.2%—
- Multi-Sector Holdings6.3%—
- Systems Software5.7%—
- Construction Machinery & Heavy Transportation Equipment5.6%—
- Interactive Media & Services4.9%—
- Household Products4.9%—
- Specialty Chemicals4.8%—
- Other holdings51.7%—
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 |
|---|---|---|---|---|---|
| $XOM | ExxonMobil Holdings Corporation | 526K | $89.2K | -895 | 7.2% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 164K | $78.6K | -155 | 6.3% |
| $MSFT | Microsoft Corporation | 190K | $70.4K | +17.9K | 5.7% |
| $CAT | Caterpillar Inc | 98.8K | $70K | -6.57K | 5.6% |
| $CHD | Church & Dwight Company Inc | 650K | $60.7K | +5.74K | 4.9% |
| $ECL | Ecolab Inc | 226K | $60.1K | -1.01K | 4.8% |
| $AAPL | Apple Inc | 232K | $59K | -592 | 4.8% |
| $MRK | Merck & Company Inc | 426K | $51.2K | -3 | 4.1% |
| $AMZN | Amazon.com Inc | 197K | $41.1K | +6.58K | 3.3% |
| $ADP | Automatic Data Processing Inc | 202K | $41K | -765 | 3.3% |
…and 121 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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