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. 1
- 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. 2
- Traders head into Tuesday watching Fed minutes and year-end liquidity conditions. 3
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. 1
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. 1
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. 2
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. 2
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. 4
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. 2
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. 1
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. 5
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.” 6
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. 3
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. 7
