Q2 2024 Shareholder Letter

Oklo is a fast fission clean power technology and nuclear fuel recycling company developing power plants to provide clean, reliable, and affordable energy at scale. We have secured over $300 million in gross proceeds and are well capitalized to execute our business plan. Oklo’s first Aurora powerhouse is expected to be operational by 2027. Our customer base is strong with 1,350 megawatts in signed letters of intent across diverse industries. We offer flexible, clean energy solutions that scale with customers’ needs. 2

Dear shareholders, Oklo has been a lifetime in the making. Growing up in New Mexico, my visits to the National Museum of Nuclear Science & History sparked a fascination with the incredible potential of nuclear energy. The idea of splitting an atom to produce 50 million times more energy than combusting a hydrocarbon felt like science fiction at the time, but it became my life’s pursuit. While studying nuclear engineering at MIT and working across sectors, I saw the nuclear industry stagnating under outdated paradigms. I believed there was potential to fundamentally reimagine how we built and sold nuclear power. We could rethink the technology, business model, financing, partnerships, and more. I met my co-founder Caroline Cochran, also a nuclear engineer from MIT, and together we set out to rethink nuclear power from the ground up. Now, more than a decade later, we are on the precipice of realizing our mission to deliver reliable, low-cost, clean energy at scale. Our merger with AltC Acquisition Corp. in May financed our business, providing Oklo with over $300 million to accelerate our strategy. Oklo will fund the first Aurora powerhouses and aims to have multiple powerhouses up and running within the next few years, starting in 2027 with our first plant in Idaho. The prospect of purchasing independent power under long-term contracts is attractive to businesses across industries. Demand is strong; we have signed over 1,350 megawatts under non-binding indications of interest from the data center, energy, and industrial sectors, showcasing the broad applicability of our technology. The Aurora technology is well demonstrated—and once it’s deployed, it will be revolutionary. Thank you for joining us on our mission to a sustainable and abundant energy future. Sincerely, Jacob DeWitte Founder & CEO, Oklo Our mission is to provide clean, reliable, and affordable energy on a global scale. The Oklo team in front of the New York Stock Exchange. Oklo co-founders Caroline Cochran and Jacob DeWitte pictured at the New York Stock Exchange. 3

Our technology is based on proven fast reactor technology that has been used for more than a combined 400 years¹ by nuclear plants around the world. Selling power, not power plants, directly to customers under long-term contracts offers what customers want and generates recurring revenue. By owning construction and operations, we aim to fast-track deployment and streamline future applications with repeatable combined license applications to the U.S. Nuclear Regulatory Commission (NRC). Our design focuses on the use of commercially available supply chain combined with factory fabrication capabilities in order to deploy and scale rapidly and cost-effectively. Foundational pillars Proven technology Modern, small-scale design Build-Own-Operate business model Oklo is well capitalized to execute our business strategy and is positioned to be the first advanced fission company to generate revenue from selling clean power. As the only advanced fission company with a site use permit, significant regulatory traction, and a secured fuel supply, we expect to build our first plant by 2027. 4

MICHAEL KLEIN Founder & Managing Partner of M. Klein & Company, Founder of Churchill Capital Oklo has a world-class board of directors with backgrounds in energy, defense, oil and gas, utilities, capital markets, and artificial intelligence. “As one of the initial investors in the company, I’ve seen first-hand how Oklo has proven itself to be an innovative energy leader, developing a cost-competitive go-to-market strategy, and solidifying important relationships with regulators, customers, and suppliers. There are huge growth opportunities ahead.” SAM ALTMAN Chairman & Board Member of Oklo | Founder & CEO of OpenAI CHRIS WRIGHT Founder & CEO of Liberty Energy, Inc. (NYSE: LBRT) LT. GEN (RET.) JOHN JANSEN United States Marine Corps RICHARD W. KINZLEY Former CFO of Black Hills Corporation (NYSE: BKH) CAROLINE COCHRAN Co-founder & COO of Oklo JACOB DEWITTE Co-founder & CEO of Oklo 5

Key milestones achieved in H1 2024 August Established preferred supplier agreement with Siemens Energy for steam turbine generator products and services. July Completed successful end-to-end demonstration of advanced fuel recycling process, advancing commercial-scale recycling facility. April Signed non-binding letter of intent to supply 50 megawatts to Diamondback Energy, a Texas-based independent oil and natural gas company, over a 20-year power purchase agreement. March In partnership with Argonne National Laboratory, Oklo successfully completed the second phase of the high-fidelity testing campaign at the Thermal Hydraulic Experimental Test Article (THETA). February Entered into a land rights agreement with the non-profit Southern Ohio Diversification Initiative to advance the deployment of two powerhouses in Southern Ohio. May Began trading on the New York Stock Exchange under the new ticker symbol “OKLO.” Signed non-binding memorandum of understanding with Atomic Alchemy to collaborate on isotope production. Partnered with computer networking company Wyoming Hyperscale to deliver 100 megawatts to its data centers over a 20-year power purchase agreement. 6 January Safety Design Strategy approved by U.S. Department of Energy (DOE) for the Oklo Aurora Fuel Fabrication Facility.

• Awarded recovered fuel material from INL • Granted site use permit from the DOE for our site in Idaho Idaho National Laboratory (INL) The first Aurora powerhouse will: This will be the first commercial advanced fission power plant in the United States. By integrating a novel business model, cutting-edge technology, and a small, scalable design, Oklo is unlocking the future of clean energy. Key first deployment milestones The first Aurora powerhouse 2027 Planned Deployment Lead with a streamlined regulatory process, paving the way for future deployments Deliver clean energy directly to customers through secured power purchase agreements Generate robust and steady revenue streams Oklo is the only advanced fission company with a site use permit, significant regulatory traction, and a secured fuel supply, positioning us to turn on our first commercial reactor in the near term. 2019 2020 2024 • Had the first-ever custom combined license application for an advanced fission power plant accepted for review by the NRC • Oklo’s Safety Design Strategy for the Aurora Fuel Fabrication Facility approved by DOE • Signed preferred supplier agreement with Siemens, strengthening supply chain • Plans to begin pre-application readiness review for combined license application by end of year 7 Idaho Falls, ID

Identify preferred sites and develop cost estimates. INITIAL PROJECT SCOPING Oklo makes it easy to purchase clean, reliable, affordable energy. How Oklo works with customers Oklo will generate revenue from selling electricity and heat directly to clients through long-term (20-40 year) power purchase agreements (PPAs). Unlike traditional nuclear developers, Oklo will build, own, and operate our own powerhouses, reducing risks for customers and ensuring significant recurring revenue. 8 Perform initial assessment of land availability and power needs. SITE EVALUATION 3 1 4 2 6 Conduct detailed engineering work to determine optimal placement. ENGINEERING ANALYSIS Sign a formal PPA, finalize project details, and Oklo submits a combined license application to the NRC. POWER PURCHASE AGREEMENT Power purchase LOIs are non-binding agreements but contain details on pricing, duration, and quantity of power needed, as well as a timeline for key milestones. LETTERS OF INTEREST (LOI) TO PURCHASE POWER An MOU sets out a framework for partnership related to scoping projects and other collaborations. OPTIONAL STEP: SIGN MEMORANDUM OF UNDERSTANDING (MOU) TO ESTABLISH PARTNERSHIP

1,350 MWe in signed letters of intent across diverse industries throughout the U.S. States of publicly announced customer agreements and the Defense Logistics Agency Energy chose Oklo to site a micro-reactor at Eielson Air Force Base* *Oklo has been honored with the Notice of Intent to Award twice. The recent procedural rescission by Defense Logistics Agency Energy, to ensure thorough documentation of due diligence during source selection, is not uncommon in large government procurement processes. This decision underscores the meticulousness of the process and does not impact our confidence in the planned contract. Memorandum of understanding to purchase electricity from planned Aurora powerhouses in Ohio Non-binding LOI to supply 100 megawatts over 20-year power purchase agreement Pre-agreement to procure up to 500 megawatts with a $25M pre-payment Non-binding LOI to supply 50 megawatts over 20-year power purchase agreement 9 Equinix United States Air Force Select announced customer engagements

ALLEVIATING TRANSMISSION CONSTRAINTS Existing transmission infrastructure is nearing capacity, and Oklo’s localized power solution reduces the need for costly transmission expansions. Demand drivers Permian Basin & Diamondback Energy Data Centers & Wyoming Hyperscale Non-binding LOI to enter a 20-year power purchase agreement. Oklo intends to supply 50 megawatts of energy to Diamondback Energy’s operations in the Permian Basin. Non-binding LOI to enter a 20-year power purchase agreement. Oklo intends to supply 100 megawatts of power to Wyoming Hyperscale’s data center campus. 10 MEETING RISING POWER DEMAND RAPID POWER DEPLOYMENT DELIVERED ONSITE DISTRIBUTED POWER GENERATION SUPPORTING EMISSION REDUCTION GOALS The region’s power demand is projected to grow sevenfold from 2022 to 2038,2 and Oklo offers a scalable solution. Oklo powerhouses can deliver timely power to support high-demand operations and scale to meet growing capacity needs. Reduces transmission and distribution costs for facilities like data centers by deploying reactors onsite. Smaller, distributed reactors enhance reliability and scalability, fitting well with data center campus structures. Oklo’s emission-free power aligns with industry and regulatory goals to reduce greenhouse gas emissions. “Our goal is to create data centers with minimal environmental impact. This collaboration with Oklo perfectly aligns with our vision for sustainable, efficient operations. By merging sustainability with advanced technology, we are setting a new standard for the future of accelerated computing.” TRENTON THORNOCK Founder and Managing Member of Wyoming Hyperscale