The Government Pension Investment Fund of Japan is one of the largest investment funds in the world.

http://www.gpif.go.jp/en/about/

With 135,108 Billion YEN = £777 Billion under management one can see why it is one of the largest funds on earth.

http://www.gpif.go.jp/en/fund/pdf/2015_q2.pdf

They have 8 categories of active investments and have selected 21 active investment managers and 6 passive investment managers.

Global Aggregate managed by:-

Goldman Sachs Asset Management
Schroder Investment Management
Sompo Japan Nipponkoa Asset Management
Nomura Asset Management
BNY Mello Asset Management
PIMCO Japan
BlackRock Japan
Prudential Investment Management
Manulife Asset Management
Mizuho Asset Management
Morgan Stanley Investment Management
Legg Mason Asset Management

U.S. Aggregate managed by:-

DIAM Co
FIL Investments

Euro Aggregate managed by:-

BNY Mello Asset Management

U.S. High Yield managed by:-

Nomura Asset Management

Euro High Yield managed by:-

UBS Global Asset Management

Emerging Markets Local Currency managed by:-

Ashmore Japan

Emerging Markets Hard Currency managed by:- 

Alliance Bernstein

Inflation Linked managed by:-

BNP Paribas Investment Partners

Passive investment managed by:-

State Street Global Advisors
Nomura Asset Management
BlackRock Japan
Mizuhu Trust and Banking
Sumitomo Mitsu Trust Bank
Resona Bank.