Investment adviser · CRD 110026

S & CO., INC.

Investment adviser filing (IA)

BOSTON, MA, United States · Form ADV filed Mar 31, 2026

Regulatory AUM: $2.46B
Client accounts: 383
Employees: 15
Advisory professionals: 6

Who they report serving

Form ADV · Item 5.D

Client types and their share of reported regulatory assets.

Client type	Clients	Regulatory assets	Share of AUM
High-net-worth individuals	302	$1,449,448,923	59.0%
Pooled investment vehicles	6	$821,236,094	33.4%
Charities	17	$170,043,989	6.9%
Individuals	58	$15,284,261	0.6%

Filing source

Form ADV 2069439 · Mar 31, 2026 · Item 5.D

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

Private funds & service providers

6 Private funds

The count excludes feeder funds. Funds in the latest filing appear first, ordered by reported gross assets. Earlier funds retain their last reported values.

S & CO. SPECIAL EQUITY FUND, LLCOther Private Fund · Last reported Mar 31, 2026$326MGross asset value

Auditor WALTER & SHUFFAIN, P.C BOSTON, Massachusetts, United States

Custodian FIDUCIARY TRUST COMPANY BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: No
External marketing: No

WALTER & SHUFFAIN, P.C
PCAOB 5439

Fund details & source

Fund ID: 805-8285581008
Reported beneficial owners: 131
Minimum commitment: $0

Form ADV 2069439 · Mar 31, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

S & CO. INVESTMENT FUND IV, LLCOther Private Fund · Last reported Mar 31, 2026$155MGross asset value

Auditor WALTER & SHUFFAIN, P.C BOSTON, Massachusetts, United States

Custodian FIDUCIARY TRUST COMPANY BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: No
External marketing: No

WALTER & SHUFFAIN, P.C
PCAOB 5439

Fund details & source

Fund ID: 805-5351318955
Reported beneficial owners: 121
Minimum commitment: $0

Form ADV 2069439 · Mar 31, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

S & CO. HEALTH SCIENCES FUND, LLCOther Private Fund · Last reported Mar 31, 2026$143MGross asset value

Auditor WALTER & SHUFFAIN, P.C BOSTON, Massachusetts, United States

Custodian FIDUCIARY TRUST COMPANY BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: No
External marketing: No

WALTER & SHUFFAIN, P.C
PCAOB 5439

Fund details & source

Fund ID: 805-1304990701
Reported beneficial owners: 113
Minimum commitment: $0
Form D file number: 021-

Form ADV 2069439 · Mar 31, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

S & CO. INTERNATIONAL FUND, LLCOther Private Fund · Last reported Mar 31, 2026$117MGross asset value

Auditor WALTER & SHUFFAIN, P.C BOSTON, Massachusetts, United States

Custodian FIDUCIARY TRUST COMPANY BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: No
External marketing: No

WALTER & SHUFFAIN, P.C
PCAOB 5439

Fund details & source

Fund ID: 805-3448478561
Reported beneficial owners: 120
Minimum commitment: $0

Form ADV 2069439 · Mar 31, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

S & CO. OPPORTUNITY FUND, LLCOther Private Fund · Last reported Mar 31, 2026$67.5MGross asset value

Auditor WALTER & SHUFFAIN, P.C BOSTON, Massachusetts, United States

Custodian FIDUCIARY TRUST COMPANY BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: No
External marketing: No

WALTER & SHUFFAIN, P.C
PCAOB 5439

Fund details & source

Fund ID: 805-1721168647
Reported beneficial owners: 87
Minimum commitment: $0

Form ADV 2069439 · Mar 31, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

S & CO ENVIRONMENTAL SUSTAINABILITY FUNDOther Private Fund · Last reported Mar 31, 2026$13.4MGross asset value

Auditor WALTER & SHUFFAIN, P.C BOSTON, Massachusetts, United States

Custodian FIDUCIARY TRUST COMPANY BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: No
External marketing: No

WALTER & SHUFFAIN, P.C
PCAOB 5439

Fund details & source

Fund ID: 805-6544871997
Reported beneficial owners: 53
Minimum commitment: $0

Form ADV 2069439 · Mar 31, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

Services & filing details

Most recent filing: Mar 31, 2026. View historical filings

Reported services

Individual portfolio management · Pooled investment vehicle management · Selection of other advisers

Compensation

Percentage of assets

Principal office

50 CONGRESS STREET, ROOM 800
BOSTON, MA, 02109, United States

CRD 110026

Filing source

Form ADV 2069439 · Mar 31, 2026 · Items 1 & 5

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.