By David Benoit 

Trian Fund Management LP has built a stake valued at about $1.05 billion in Bank of New York Mellon Corp., according to a person familiar with the matter.

The activist investor, led by Nelson Peltz, wants to discuss ideas for creating more shareholder value but hasn't had any conversations yet with the trust bank's management, the person said.

"Trian is a respected investment firm. We look forward to engaging with them as we do all our investors," a Bank of New York Mellon spokesman said Monday.

Bank of New York Mellon, an investment manager and the bank for Wall Street's banks, has made significant changes this year. It said in May that it would sell its corporate trust unit, and it sold its corporate headquarters building for $585 million.

Trian had a small position as of the end of March, according to a Monday regulatory filing, though the firm has since added to the stake. The fund had told its own investors in a quarterly letter in April that it had a new "core position," though it provided few details on it at the time.

The nation's largest banks are rarely targeted by activist investors, who take stakes in public companies and push changes such as selling divisions or returning more capital to shareholders. Banks face strict regulation on making such decisions, which some activist investors say could complicate efforts to drive change from the outside.

But Trian has been among the few activists to invest in the banking world, including once taking a stake in Bank of New York rival State Street Corp. In 2011, Trian pushed State Street to separate its giant investment management arm, State Street Global Advisors, though that never happened.

Trian also holds a stake in investment bank Lazard Ltd. It has met with the bank's management and said last year that it supported the bank's strategic plans.

Write to David Benoit at david.benoit@wsj.com

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