NEW YORK, December 29, 2025, 8:43 PM ET — Market closed
- Oklo fell 3.7% in regular trading and slipped about 1% in late after-hours quotes. StockAnalysis
- SEC filings showed CEO Jacob DeWitte and COO Caroline Cochran moved millions of shares into family trusts and grantor retained annuity trusts (GRATs) at $0. SEC+1
- Traders head into Tuesday watching Fed minutes and year-end liquidity conditions. MarketWatch+1
Oklo Inc. shares closed down 3.7% on Monday as investors digested insider ownership filings that disclosed large transfers of stock by the company’s co-founders. StockAnalysis+2SEC+2
The moves landed into thin year-end markets, when single-stock flows can have outsized impact and disclosure-driven headlines can set the tone. Oklo’s shares have swung sharply through December, after hitting triple-digit levels earlier in the month. StockAnalysis
In separate Form 4 filings — documents insiders must submit to report trades and other ownership changes — CEO Jacob DeWitte reported gifting 7,851,901 Class A shares to the Jacob DeWitte Family Trust for no consideration, according to the filing. SEC
The same filing also showed 7,583,085 shares moved for no consideration into the Caroline DeWitte Family Trust and 1,000,000 shares contributed to a grantor retained annuity trust, or GRAT. SEC
Cochran’s Form 4 likewise described a transfer of 7,583,085 shares to the Caroline DeWitte Family Trust and trust contributions, with footnotes saying the insiders remained beneficial owners of shares held by the trusts. SEC
GRATs are estate-planning trusts that can shift the future appreciation of assets to heirs while the grantor receives annuity payments. The filings collectively involved about 15.4 million shares, worth roughly $1.1 billion at Monday’s close. SEC+1
Oklo ended the regular session at $74.09 after trading between $73.76 and $78.48, with about 8.4 million shares changing hands, according to StockAnalysis. The stock was quoted at $73.35 at 7:59 p.m. ET, down about 1% in after-hours trading. StockAnalysis
The broader market drifted lower, with the SPDR S&P 500 ETF Trust down about 0.4% and the Invesco QQQ Trust off roughly 0.5% on the day.
Nuclear-linked names were mixed. NuScale Power fell about 2.4% and Centrus Energy slid nearly 2%, while Cameco was little changed.
Oklo describes itself as a fission technology and nuclear fuel recycling company that aims to deploy power plants to supply “clean, reliable, and affordable energy at scale,” according to its investor website. oklo.com
In a Dec. 17 statement tied to work with Los Alamos National Laboratory, DeWitte said the company’s campaign was “part of a larger plan to turn America’s surplus fuel stockpiles into bridge fuel for advanced reactors.” oklo.com
Before Tuesday’s session, investors will watch U.S. data including the S&P Case-Shiller home price index at 9:00 a.m. ET and the Chicago PMI survey at 9:45 a.m., followed by minutes from the Fed’s Dec. 9–10 meeting at 2:00 p.m. ET. MarketWatch+1
For Oklo, traders will focus on whether insider disclosures continue and whether the shares stabilize after a string of late-December declines; the stock is down about 11% from its Dec. 19 close. Earnings calendars tracked by Zacks currently point to the next report in late March 2026. investing.com+1
