Jeff Bezos, Amazon’s founder and chief executive, and his wife, MacKenzie Bezos, said on Twitter on Thursday that they had finalized the details of their divorce.

Mr. Bezos will keep 75 percent of the couple’s Amazon stock and all of their ownership of The Washington Post and the Blue Origin space company, Ms. Bezos wrote. Mr. Bezos will also have “sole voting authority” over Ms. Bezos’ Amazon shares, according to a filing with the Securities and Exchange Commission.

After the divorce, Ms. Bezos will own roughly 4 percent of Amazon, a stake that was worth almost $36 billion on Thursday. By keeping 75 percent of the couple’s Amazon shares, or about 12 percent of the company, Mr. Bezos will most likely remain the richest person in the world. His remaining stake in the company was worth almost $108 billion on Thursday. (Bill Gates, the second wealthiest, is worth $102 billion, according to Bloomberg.)

Experts had said that in Washington State, where Amazon is based and where the couple have been raising their four children, Ms. Bezos was entitled to roughly half of their assets. They have other investments and properties across the United States. The details of divorce settlements are not public, and theirs could contain other compensation for Ms. Bezos.