HIRO MIZUNO

Mizuno did not start out as a revolutionary. He spent 15 years at Sumitomo Trust and Banking, working in Japan, Silicon Valley, and New York from 1988.

Then he jumped to London and became a partner at Coller Capital, a private equity firm. The turning point came in 2015.

He took over as chief investment officer of Japan's Government Pension Investment Fund, or GPIF, the largest pension fund in the world with around $1.5 trillion in assets. Most people in that seat would just try not to break anything.

Mizuno did the opposite. He signed GPIF up to the UN Principles for Responsible Investment and started reshaping how the fund thought about risk.

He left in 2020 and immediately became a UN Special Envoy on sustainable finance, joined Tesla's board, and took a role at food giant Danone. His second act was busier than most people's first.

His big stage was GPIF, the $1.5 trillion Japanese pension fund that pays retirement money to a whole country. He was the CIO, the person deciding how that mountain of money got invested.

After GPIF he collected an unusual set of roles. He joined Tesla's board of directors in 2020, sitting in the room with Elon Musk.

He took a seat on the mission committee of Danone, the French food company behind Activia and Evian. And the United Nations named him Special Envoy on Innovative Finance and Sustainable Investments.

Before all of it, he cut his teeth in private equity at Coller Capital in London and in banking at Sumitomo Trust.

Mizuno's whole approach flows from one idea he calls universal ownership. Here is the thing.

When your fund is $1.5 trillion, you do not own a slice of the market. You basically own a piece of everything.

You cannot sell your way out of a bad company or a bad industry because you own all of them. So beating the market is pointless.

You are the market. That flips normal investing on its head.

Instead of picking winners, Mizuno focused on making the entire system better, because a healthier economy is the only way a fund that big actually grows over decades. He treats climate risk and bad corporate governance as threats to his own portfolio, since he owns the companies causing them and the companies harmed by them.

The headline win is not a trade. It is a signature.

In 2015 Mizuno signed GPIF, the world's largest pension fund, up to the UN Principles for Responsible Investment. When a $1.5 trillion fund commits to ESG, the entire industry pays attention.

He followed it by moving roughly $9 billion into new ESG stock indices in 2017, giving companies a concrete money reason to improve their scores. Almost overnight, ESG went from a fringe topic to something every big asset manager had to take seriously.

He did not prove ESG by writing a paper. He proved it by pointing the biggest checkbook on the planet at it and letting everyone else scramble to follow.

The honest knock on Mizuno is that he bet his legacy on an idea he could never fully prove paid off in returns. Critics argued his ESG push and his 2019 decision to halt stock lending sacrificed income and hard performance for principle.

He also had brutal timing on the way out. He left GPIF in March 2020, right as the pandemic crashed markets, and the fund posted a record quarterly loss of around $165 billion.

That collapse was the market's doing, not his. But it was a rough final scene.

And the deeper question still hangs over his whole crusade. Did making the world's biggest fund more responsible actually make it richer, or just more virtuous?

He is convinced it does both. The scoreboard is still being written.

His guiding belief is that a giant long-term investor has a duty to improve the system, not just extract from it. He is blunt about his motive.

He has said he is almost only interested in changing the system. Money for him is a lever to push companies toward better behavior over decades.

He built a chain of logic that became his signature. A sustainable portfolio needs a sustainable market.

A sustainable market needs a sustainable society. And a sustainable society needs a sustainable environment.

Each one depends on the one below it. So an investor who ignores the environment is, in his view, quietly wrecking his own returns.

Mizuno keeps a low personal profile, which fits the man. In a business stuffed with loud egos, he comes across more like a thoughtful professor than a titan of finance.

His life is genuinely global. He built his career across Tokyo, New York, Silicon Valley, and London, and now moves between UN rooms, a Tesla boardroom, and a lecture hall.

Picture the contrast. A careful, understated Japanese pension executive sitting on a board next to Elon Musk.

That mix of quiet and audacious is the whole story of his second act.

Mizuno earned his MBA from the Kellogg School of Management at Northwestern University in 1995. That American business training, paired with a long banking career back home in Japan, gave him a rare double fluency.

He could talk to Wall Street and Tokyo, and later to the United Nations. He now stays close to that world as a fellow at Kellogg, teaching the sustainable-finance ideas he spent his career pushing.

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