The largest U.S. pension by assets has made material changes in some of its largest holdings.

California Public Employees' Retirement System bought more shares of crypto exchange Coinbase Global, data-analytics firm Palantir Technologies, artificial-intelligence chip firm Nvidia, and digital brokerage Robinhood Markets in the second quarter.

Calpers, as the pension is known, disclosed the trades in a form it filed with the Securities and Exchange Commission.

The pension, which manages about $570 billion of assets, didn't immediately respond to a request for comment.

Calpers bought 98,827 more Coinbase shares to end the second quarter with 332,791 shares.

The pension ticked up both its investments in Palantir and Nvidia by about 10% to 3.6 million shares and 64.7 million shares.

The pension bought 186,687 more Robinhood shares to end June with 1,261,185 shares.

Inside Scoop is a regular Barron's feature covering stock transactions by corporate executives and board members -- so-called insiders -- as well as large shareholders, politicians, and other prominent figures. Due to their insider status, these investors are required to disclose stock trades with the Securities and Exchange Commission or other regulatory groups.