---
title: "Japan master trust and custody bank landscape"
aliases:
  - "japan-master-trust-and-custody-bank-landscape"
  - "Japan master trust custody landscape"
  - "資産管理専門銀行 landscape"
domain: "banking"
created: 2026-05-22
last_updated: 2026-07-29
last_tended: 2026-07-29
review_by: 2026-10-27
confidence: likely
tags: [banking, trust-bank, master-trust, custody, asset-administration, pension]
status: active
sources:
  - "https://www.mastertrust.co.jp/company/information.html"
  - "https://www.mastertrust.co.jp/about/overview.html"
  - "https://www.mastertrust.co.jp/business/asset-management.html"
  - "https://www.mastertrust.co.jp/company/"
  - "https://www.custody.jp/english/corporate/index.html"
  - "https://www.custody.jp/corporate/information/index.html"
  - "https://www.custody.jp/recruit/aboutus/about.html"
  - "https://www.custody.jp/recruit/aboutus/business.html"
  - "https://www.shintaku-kyokai.or.jp/en/pdf/trusts_under_management.pdf"
  - "https://www.fsa.go.jp/menkyo/menkyoj/kenei.pdf"
---

# Japan master trust and custody bank landscape

## Overview

Japan's master-trust / custody-bank landscape is a two-anchor domestic infrastructure layer: [[trust-banks/master-trust-bank|Master Trust Bank of Japan]] and [[trust-banks/custody-bank|Custody Bank of Japan]]. They are not "investors" in the ordinary sense; they are asset-administration banks for pensions, investment trusts, insurers, asset managers, and institutional investors.

Use this page with [[banking/japan-trust-bank-custody-map|trust-bank custody map]], [[securities/japan-stock-lending-market-route|stock lending market route]], [[securities/japan-market-infrastructure-map|market infrastructure map]], [[foreign-financial-institutions/bny-mellon-japan|BNY Mellon Japan]], and [[foreign-financial-institutions/state-street-japan|State Street Japan]].

## Landscape Map

| Institution | Shareholder / group logic | Functional reading |
|---|---|---|
| [[trust-banks/master-trust-bank|Master Trust Bank of Japan]] | MUFG trust + major life / cooperative finance shareholders. | Asset-administration specialist and major "trust account" nominee name. |
| [[trust-banks/custody-bank|Custody Bank of Japan]] | Sumitomo Mitsui Trust / Mizuho / insurer-linked custody consolidation route. | Asset-administration specialist and major "trust account" nominee name. |
| [[foreign-financial-institutions/bny-mellon-japan|BNY Mellon Japan]] | Global custody / securities services group. | Global-custody, asset-servicing, and foreign-investor bridge. |
| [[foreign-financial-institutions/state-street-japan|State Street Japan]] | Global custody / asset-servicing group. | Global-custody and institutional services bridge. |
| Full-service trust banks | MUFG Trust, Mizuho Trust, SMTB, SMBC Trust. | Wider trust / estate / real estate / pension / securities-agency functions. |

Sources: institution type, ownership, and disclosed business functions come from the current MTBJ and CBJ company/business pages and the FSA trust-bank list. Global-custodian rows are research routes, not market-share claims. ^[Sources: https://www.mastertrust.co.jp/company/information.html; https://www.mastertrust.co.jp/about/overview.html; https://www.custody.jp/corporate/information/index.html; https://www.custody.jp/recruit/aboutus/business.html; https://www.fsa.go.jp/menkyo/menkyoj/kenei.pdf.]

## What They Actually Do

| Workstream | Description |
|---|---|
| Safekeeping and settlement | Hold and settle stocks, bonds, funds, and foreign assets under client instruction. |
| Corporate actions | Process dividends, splits, conversions, redemptions, elections, and notifications. |
| Fund / pension accounting | Calculate holdings, valuations, reports, and asset-owner records. |
| Global-custody coordination | Connect domestic clients to overseas custodians and overseas assets. |
| Securities lending support | Administer lending programs and collateral / recall processes where applicable. |
| Middle / back-office outsourcing | Support asset managers and institutional investors with operational services. |

## Why Filings Show Their Names

Major-shareholder tables often show names such as "Master Trust Bank of Japan, Ltd. (trust account)" or "Custody Bank of Japan, Ltd. (trust account)." That usually means:

1. the trust / custody bank is the legal / record name;
2. the economic beneficial owners are pensions, funds, insurers, asset managers, or other clients;
3. voting and investment decisions usually follow client / manager instruction;
4. the trust bank's AUC / AuA is not proprietary capital.

This rule is critical when reading [[banking/INDEX|banking INDEX]], issuer filings, cross-shareholding analysis, and governance pages.

## Public Research Fields

| Question | Public relevance |
|---|---|
| Can two domestic specialist banks keep scaling with NISA / pension / fund-flow growth? | Custody and fund-administration volume grows with market values and investment adoption. |
| How much back-office outsourcing moves from asset managers to custody banks? | It changes cost structure and operational concentration. |
| How do global custodians and domestic custody banks divide work? | Foreign assets, Japanese sub-custody, and global investor flows require coordination. |
| Does stock lending become a larger revenue / liquidity layer? | Links custody to [[securities/japan-stock-lending-market-route|stock lending]] and short-selling analysis. |
| How will tokenized securities or stablecoin settlement affect custody? | Future link to [[fintech/INDEX|fintech]] and [[securities/japan-market-infrastructure-map|market infrastructure]]. |

## Research Checklist

1. Check whether a custody bank reference is an entity page, a shareholder nominee name, or an asset-servicing mandate.
2. Use official company pages for current business lines and AUC / AuA figures.
3. Treat Trust Companies Association statistics as domain-level background, not company-specific share unless clearly stated.
4. Link stock lending, voting, and corporate-action questions to the correct specialist page.
5. Avoid claiming beneficial ownership from nominee-name appearance alone.

## Related

- [[banking/INDEX]]
- [[banking/japan-trust-bank-custody-map]]
- [[trust-banks/master-trust-bank]]
- [[trust-banks/custody-bank]]
- [[foreign-financial-institutions/bny-mellon-japan]]
- [[foreign-financial-institutions/state-street-japan]]
- [[securities/japan-stock-lending-market-route]]
- [[securities/japan-short-selling-and-stock-loan-controls]]
- [[securities/japan-market-infrastructure-map]]
- [[INDEX|FinWiki index]]

## Sources

- Master Trust Bank of Japan: official business overview and company information.
- Custody Bank of Japan: official company / business explanation.
- Trust Companies Association of Japan: trust assets under management statistics.
- FSA: trust-business financial institution list.