Microsoft cofounder Bill Gates donated 64 million shares of Microsoft, worth an estimated $4.6 billion in early June, according to a just-released filing with the Securities & Exchange Commission.

As a result, Gates now has a 1.3 percent stake left in the company he founded with Paul Allen, by Bloomberg’s estimates. Comparatively, in 1996, Gates’ stake in Microsoft was 24 percent, Bloomberg said.

The SEC filing made public on August 14 did not stipulate the name of the recipient of Gates’ latest donation, but the majority of his recent donations have gone to the Bill & Melinda Gates Foundation charity.

Update: GeekWire has confirmed that the recipient of the 64-million-share donation is the Bill & Melinda Gates Foundation.

The largest individual Microsoft shareholder continues to be former CEO Steve Ballmer. Gates is the second largest and current Microsoft CEO Satya Nadella is No. 3. Ballmer has been Microsoft’s largest individual shareholder since 2014 or so.

As of last Fall, according to Microsoft’s 2016 proxy statement, Gates owned 2.46 percent of Microsoft’s common stock.

Bloomberg said Gates’ most recent donation of Microsoft shares was his largest such donation since 2000. For now, Gates remains the richest man in the world.

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