S&CO INC

Q1 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
3/31/2026
Date filed
5/7/2026
Form type
13F-HR
Num holdings
218
Total value ($000)
$1,611,868
Net value change ($000)
+1,961 (0.1%)
New positions
4
Sold out positions
4
Turnover %
0.8%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/5/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
XOM 25,835 40.7%
AZN 9,832 NEW
CAT 9,636 16.0%
CHD 6,639 12.3%
MRK 6,395 14.3%
JNJ 5,642 17.2%
APD 4,194 18.0%
AR 4,173 25.3%
RHHBY 4,113 148.6%
RPRX 3,344 24.1%
Top Reduces (Value $000, Stocks/ETFs)
MSFT -12,921 -15.5%
ADP -11,114 -21.3%
PROSY -8,739 -28.0%
ABT -7,899 -27.8%
BSX -5,639 -34.6%
AAPL -4,360 -6.9%
BRK-B -3,926 -4.8%
TMO -3,765 -15.5%
GOOGL -3,204 -8.6%
AMZN -2,927 -6.7%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type