John Overdeck proposed on the spring equinox of 2002. A few weeks later, his new firm, Two Sigma, started trading with about $27 million. By the wedding that October it ran about $350 million. Nearly 24 years on, the marriage is ending in a New Jersey courtroom. There was never a prenup.
Peter Rudegeair tells the story on the Journal's front page. Overdeck, 56, has offered his estranged wife $723 million. Her lawyers want a cash payment equal to 35% of his stake in Two Sigma. By their estimate, that's about $2.2 billion. Two Sigma is an $85 billion quant-trading firm. It's private, so nobody can look up the price. Earlier this month an expert witness called by Overdeck put numbers on it. By that expert's count, the stake was worth about $50 million when the couple married. It was roughly $4.5 billion when Laura Overdeck filed in March 2022. Judge Bruce Buechler shut the public out partway through that testimony.
Two fights, one checkbook
Here's why the number matters so much. Overdeck has feuded for years with his co-founder, David Siegel, over who runs the firm. The two stepped down as co-CEOs in August 2024 and each named a loyal proxy. Overdeck put himself on the management committee in March 2025. Siegel's pick later resigned and cited governance challenges. There are now two arbitration claims. If Overdeck had to sell a big piece of his stake to raise cash, control could tip to Siegel. “Maintaining voting parity with Dr. Siegel is a principal concern,” he testified. The judge made the court's job plain. It's handling a divorce, not a trial between the two partners.
The funds are still doing well. One Two Sigma fund gained about 16% this year through September. The firm also raised about $4.5 billion in net new money this year, a person familiar with the matter said. But some big clients left over the governance fight. The State of Wisconsin Investment Board manages more than $178 billion, including the state retirement system's money. It fully redeemed after the rift became public. It had disclosed over $1 billion in Two Sigma funds at the end of 2023. New Mexico's public employees' retirement association serves about 100,000 members and retirees. It pulled roughly $100 million this summer. Its August board minutes cited organizational concerns and no credible timeline to fix them.
Our read
This is an Estate and family-planning story, and the lesson has nothing to do with billions. A business started near a wedding gets valued twice, once at the start and once at the end. In many states, much of the growth in between can count as shared property. The rules vary by state. A prenup or a postnup can settle in advance what's separate and what's shared. A buy-sell agreement among partners can spell out what happens if one owner has to sell in a hurry. Neither document is romantic. Both are usually cheaper than a trial. General principles, not advice for anyone in particular.
The same two-date math can apply to your own retirement money. A teacher's pension or a 403(b) built partly before the wedding is often split differently from the part built during it. So this week, find a statement that shows your balance or service credit near your wedding date. File it with your important papers, because old records get hard to find. If you own a stake in a business, find the buy-sell agreement and read what it says about divorce. Those are both fair things to raise at your next plan review. You don't shop for an umbrella after the first drop lands.