AUMdb

Asset Management One Co., Ltd.

SEC-registered Investment Adviser · Mega ($100B+) CRD 110843 · SEC file 801-55047 · Tokyo · www.am-one.co.jp
☆ Save with Pro ADV data as of Jun 29, 2026
Regulatory AUM
$471B
Discretionary
$471B
Clients
1,406
Avg AUM / client
$335M
Accounts
1,741
Employees
950

AUM over time

$125B $515B
Mar 2012 Mar 2026

Annual snapshots from Form ADV filings · as of Jun 29, 2026

Asset allocation (SMA assets by investment type)

as of Jun 29, 2026
Exchange-traded equities
$226B 48%
Sovereign bonds
$151B 32%
US government & agency bonds
$37.6B 8%
Pooled investment vehicles
$23.5B 5%
Investment-grade corporate bonds
$18.8B 4%
Registered investment companies (funds/ETFs)
$4.7B 1%
Cash & equivalents
$4.7B 1%

Share of SMA assets by investment vehicle type, as filed in Form ADV Item 5.K. Dollar figures are percentages applied to total regulatory AUM.

Who they serve

Client typeClientsAUM% of AUM
Individuals (non-high net worth) 0 $0
High net worth individuals 0 $0
Banking or thrift institutions 17 $317M 0.07%
Pooled investment vehicles (non-investment companies) 942 $138B 29.3%
Pension and profit sharing plans 321 $56.2B 11.9%
Charitable organizations 30 $1.9B 0.4%
State or municipal government entities 16 $249B 53.0%
Other investment advisers 11 $2.2B 0.47%
Insurance companies 9 $9.9B 2.11%
Sovereign wealth funds and foreign official institutions 1 $7.8B 1.65%
Corporations and other businesses 59 $5.0B 1.07%

People (15)

NameRole / titleCredentialsWith firm sinceOwnership
Iwabuchi, Koya, Nmn Executive Officer, Deputy Head Of Institutional Marketing Division Apr 2018 (8y) Less than 5%
Maeda, Michiharu, Nmn Director, Member Of Audit And Supervisory Committee Jun 2019 (7y) Less than 5%
Kato, Masahiko, Nmn Chief Operations Officer, Managing Executive Officer, Head Of It & Systems, Operations Division Apr 2020 (6y) Less than 5%
Muramatsu, Shigeki, Nmn Executive Officer, Deputy Head Of Investment Division Apr 2022 (4y) Less than 5%
Okawa, Tatsuyuki, Nmn Executive Officer, Deputy Head Of Investment Trust Marketing Division Apr 2022 (4y) Less than 5%
Toda, Tetsuji, Nmn Director, Managing Executive Officer, Deputy Head Of Planning Division Apr 2022 (4y) Less than 5%
Ito, Masako, Nmn Executive Officer, Deputy Head Of Planning Division Apr 2023 (3y) Less than 5%
Maruyama, Takashi, Nmn Managing Executive Officer, Head Of Investment Division Apr 2023 (3y) Less than 5%
Ono, Kenichi, Nmn Chief Financial Officer, Director, Managing Executive Officer, Head Of Planning Division Apr 2023 (3y) Less than 5%
Ozaki, Satoshi, Nmn Executive Officer, Head Of Investment Trust Marketing Division Apr 2023 (3y) Less than 5%
Sugihara, Noriyuki, Nmn Direcor, President & Chief Executive Officer Apr 2023 (3y) Less than 5%
Asano, Tomohiko, Nmn Chief Compliance Officer, Chief Legal Officer, Direcor, Managing Executive Officer, Head Of Risk Management Division Apr 2024 (2y) Less than 5%
Miki, Takeshi, Nmn Managing Executive Officer, Head Of Institutional Marketing Division Apr 2024 (2y) Less than 5%
Sasaki, Yusuke, Nmn Managing Executive Officer, Head Of Strategic Fund Investment Division, Head Of Product Division Apr 2024 (2y) Less than 5%
Aoki, Nobutaka, Nmn Director, Member Of Audit And Supervisory Committee Jun 2024 (2y) Less than 5%

Entity owners (Schedule A/B)

EntityTitle / statusSinceSch.Ownership
Mizuho Financial Group, Inc. Direct Owner Mar 2003 A 50% – 75%
Dai Ichi Life Holdings, Inc. Direct Owner Oct 1999 A 25% – 50%

Undisclosed: 0% – 25% of the firm is not attributable from the filed Schedule A bands.

Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.

Documents (1 archived)

FormPeriodSize
Form ADV (full filing) 06/29/2026 1.74 MB View · PDF · Source ↗

Archived copies of the firm's regulatory filings, versioned by content hash.

Disciplinary disclosures

Civil judicial as of Jun 28, 2024

Allegations: THE PLAINTIFF IS ONE OF THE INVESTORS OF A JAPANESE INVESTMENT TRUST FUND (THE "FUND") WHICH WAS MANAGED BY SHINKO ASSET MANAGEMENT CO., LTD ("SHINKO", MERGED TO DIAM CO., LTD. AND NAME CHANGED TO ASSET MANAGEMENT ONE CO., LTD. AS OF OCTOBER 1ST, 2016). THE FUND WAS A PRIVATELY PLACED FUND FOR QUALIFIED INSTITUTIONAL INVESTORS. SHINKO SOLD EQUITIES IN THE FUND IN ACCORDANCE WITH REDEMPTION REQUEST FROM THE PLAINTIFF. LATER THE SAME DAY, IT WAS TURNED OUT THAT THE AMOUNT OF REDEMPTION WAS ONE FIGURE GREATER THAN PLAINTIFF' INTENDED AMOUNT. SHINKO BOUGHT BACK THE EQUITIES BUT A LOSS EVENTUATED TO THE FUND DURING SELLING AND BUYING. THE PLAINTIFF ALLEGED THAT SHINKO HAS CAUSED A FINANCIAL LOSS TO THE PLAINTIFF. Status: Final Summary: THE COURT CASE BETWEEN THE PLAINTIFF AND SHINKO ASSET MANAGEMENT CO., LTD. (DEFENDANT, WHICH MERGED INTO AM ONE ON OCTOBER 1, 2016), FILED TO THE TOKYO DISTRICT COURT ON JULY 31, 2013. THE PLAINTIFF IS ONE OF THE INVESTORS OF A JAPANESE INVESTMENT TRUST FUND (THE "FUND") WHICH WAS MANAGED BY SHINKO ASSET MANAGEMENT CO., LTD. (THE FUND WAS A PRIVATELY PLACED FUND FOR QUALIFIED INSTITUTIONAL INVESTORS.) ON SEPTEMBER 30, 2016, THE COURT HANDED DOWN A JUDGMENT THAT THE DEFENDANT SHOULD PAY YEN 40 MILLION TO THE PLAINTIFF. SUCH AMOUNT WAS ONLY PART OF THE AMOUNT CLAIMED BY PLAINTIFF, BECAUSE OF COMPARATIVE FAULT (THE COURT FOUND BOTH PARTY'S NEGLIGENCE.) NEITHER PARTY MADE AN APPEAL AND THE CASE HAVE BEEN CLOSED.

Regulatory · Item 11.D(4) as of Jun 28, 2024

Allegations: THE REGULATORY ACTION IS DIRECTED TO MIZUHO BANK LTD. ("MIZUHO BANK") AND ITS PARENT COMPANY, MIZUHO FINANCIAL GROUP INC. (THE "MHFG"). MIZUHO BANK CAUSED SYSTEM FAILURES EIGHT TIMES IN TOTAL DURING THE PERIOD FROM FEBRUARY TO SEPTEMBER 2021, WHICH SIGNIFICANTLY AFFECTED ITS INDIVIDUAL AND CORPORATE CUSTOMERS. FURTHERMORE, IN THE RESTORATION PROCESS AFTER THE SYSTEM FAILURE ON SEPTEMBER 30, A PROBLEM WAS FOUND IN RELATION TO MIZUHO BANK'S COMPLIANCE WITH LAWS AND REGULATIONS RELATED TO ASSET FREEZING AND OTHER ECONOMIC SANCTIONS AS WELL AS THE AML/CFT GUIDELINES. THE FSA FOUND THAT THE DIRECT CAUSE OF THE SERIES OF MULTIPLE SYSTEM FAILURES AS FOLLOWS: ·MIZUHO BANK HAS FAILED TO CONDUCT VERIFICATION SUFFICIENTLY FOR ENSURING QUALITY IN SYSTEM DEVELOPMENT AND RESPONSES TO FAILURES. ·MIZUHO BANK HAS NOT DEVELOPED A MAINTENANCE AND OPERATION STRUCTURE TO ENSURE STABLE OPERATION OF ITS NEW CORE SYSTEM, SUCH AS FAILING TO CORRECT PROBLEMS IN SYSTEM MAINTENANCE AND OPERATION AND TO GOVERN OUTSOURCEES SUFFICIENTLY. ·MIZUHO BANK HAS FAILED TO VERIFY ITS PREPAREDNESS FOR EMERGENCIES SUFFICIENTLY THROUGH DRILLS AND TRAINING. THE FSA FURTHER FOUND THAT MHFG FAILED TO MANAGE AND CONTROL MIZUHO BANK APPROPRIATELY AS A BANK HOLDING COMPANY AND IDENTIFIED MHFG'S GOVERNANCE RELATED ISSUES. THE FSA CONSIDERS THAT THE ROOT CAUSES OF THESE PROBLEMS IN TERMS OF SYSTEMS AND GOVERNANCE ARE AS FOLLOWS: (1)DISREGARD FOR SYSTEM-RELATED RISKS AND EXPERTISE (2)DISREGARD FOR THE ACTUAL SITUATION OF THE IT SECTION (3)LACK OF SENSITIVITY TO THE IMPACT ON CUSTOMERS AND DISREGARD FOR THE ACTUAL SITUATION OF THE SALES SECTION (4)ATTITUDE TO REFRAIN FROM SAYING WHAT NEEDS TO BE SAID AND TO ONLY DO WHAT WAS INSTRUCTED ACCORDINGLY, THE FSA HAS ORDERED MIZUHO BANK AND MHFG TO FORMULATE BUSINESS IMPROVEMENT PLANS AS FURTHER DESCRIBED IN 12.B BELOW. Status: Final Sanction Detail: SEE ABOVE. Summary: MIZUHO BANK AND MHFG WILL BE TAKING ACTIONS AS DIRECTED IN THE BUSINESS IMPROVEMENT ORDER AND PROVIDE A BUSINESS IMPROVEMENT PLAN, RELEVANT REPORTS, AND STATUS UPDATES TO THE FSA BY THEIR RESPECTIVE DUE DATES AS SET FORTH IN THE BUSINESS IMPROVEMENT ORDER.

Regulatory · Item 11.D(4) as of Jun 28, 2024

Allegations: MIZUHO FINANCIAL GROUP INC. (THE "ADVISORY AFFILIATE")'S BANKING SUBSIDIARY, MIZUHO BANK, LTD. ("MIZUHO BANK") HAD SEVERAL SYSTEM FAILURES IN 2021 WHICH CAUSED SIGNIFICANT INFLUENCES ON ITS CUSTOMERS. IN THE MEANTIME, MIZUHO BANK PLANS TO RENEW AND UPDATE ITS SYSTEMS NECESSARY FOR BUSINESS CONTINUITY (THE "SYSTEM RENEWAL PLAN"). IN CONNECTION WITH THE ABOVE, THE FSA ISSUED A BUSINESS IMPROVEMENT ORDER TO MIZUHO BANK AND THE ADVISORY AFFILIATE THEREBY ORDERING MIZUHO BANK (1) TO REEXAMINE AND REVIEW THE SYSTEM RENEWAL PLAN TAKING INTO ACCOUNT THE PAST SYSTEM FAILURES, THE NECESSITY AND URGENCY OF THE SYSTEM RENEWAL PLAN, AND POSSIBLE RISKS TO THE BANKING BUSINESS, (2) TO ENSURE APPROPRIATE CONTROLS BE PLACED IN CONNECTION WITH THE SYSTEM RENEWAL PLAN AND (3) TO SUBMIT THE RESULTS OF (1) AND (2) ABOVE. THE BUSINESS IMPROVEMENT PLAN ALSO ORDERED THE ADVISORY AFFILIATE, AS A BANK HOLDING COMPANY OF MIZUHO BANK, TO VERIFY THE RESULTS OF MIZUHO BANK'S REEXAMINATION AND REVIEW OF THE SYSTEM RENEWAL PLAN AS WELL AS A PLAN FOR APPROPRIATE CONTROLS, AND TO SUBMIT THE RESULTS OF SUCH VERIFICATION BY OCTOBER 29, 2021. Status: Final Sanction Detail: SAME AS ABOVE. Summary: THE ADVISORY AFFILIATE IS IN THE PROCESS OF REVIEWING AND VERIFYING MIZUHO BANK'S SYSTEM RENEWAL PLAN AND MANAGEMENT CONTROLS, AND PREPARING THE VERIFICATION RESULTS TO BE SUBMITTED TO THE FSA.

Disclosure text reproduced verbatim from the firm's own Form ADV filings.

How they charge

  • Percentage of assets under management
  • Fixed fees
  • Performance-based fees

Services

  • Portfolio management for pooled investment vehicles
  • Portfolio management for businesses/institutional clients
  • Selection of other advisers
  • Other services

Custody

Reported custodians

Amounts as reported in ADV Item 5.K.(3) (custodians holding 10%+ of SMA assets).

Firm reports it does not have custody of client funds or securities (Item 9.A).

Source

All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Jun 29, 2026.

View current Form ADV (SEC/IAPD) ↗