Stephen Marcus
1.5K posts

Stephen Marcus
@smarcus
Experienced founder of seven companies and venture capitalist. Will work for great coffee.

Thank you. There was real risk that it wouldn’t work live. There were concerns with how the chip would fare being run around with, risk of dropping, risk of boot up taking longer or headless mode failing, etc etc… When we actually did it, it took around 10s longer than we expected for the headless server to boot up; it came to like 3 seconds before I clicked the refresh button on stage 😂 control room was freaking out the whole time thinking something failed We will continue to operate live and transparently. At some point a live demo we do will fail, and that will be ok too. We decided at the very beginning that nuclear was going to have to be a transparent industry in order to make the worlds energy



The Road to Serfdom made simple: 1. Plan the whole economy: someone must decide what gets made and who gets what, since people don’t naturally agree on one set of priorities. 2. These decisions are too big and detailed for normal democratic debate, so power shifts to a smaller group who can just act – technocrats. 3. Fixed laws everyone can rely on get replaced by case-by-case rulings, because a plan needs flexibility, not predictability. 4. Dissent becomes a problem to manage, not an opinion to vote on – the plan can’t work if people are free to ignore it. 5. Enforcing all that selects for people most willing to be ruthless – Hayek’s “worst get on top” – i.e. negative moral selection. 6. Since economics touches everything (your job, home, speech), controlling the economy ends up controlling your whole life. That’s the "serfdom."



We just raised $96M to build and deploy our microreactors. This round powers the work ahead — advancing our hardware, maturing our operations, and paving the way for our first reactor demonstration in 2026. Two years in: 60 people, three states, a 145,000-sq-ft facility, and contracts across DoW, NASA, and others. We’re moving fast. Come build with us. antaresindustries.com/updates/a-lett…

New Scale. More Capacity. We've secured $104M to scale satellite production to 2 ESPA-class satellites/day. Proud to welcome @RiotVentures, @GVteam, @Lux_Capital, the @EU_EIC Fund & @shrugVC on our mission to streamline access to space data. More: endurosat.com/news/endurosat…




We have both kinds in our portfolio. But it turns out there is no correlation between how hot a seed deal is and success. It just shows how wrong investors are at the early stages.

Today, Valar Atomics became the first startup in history to split the atom. Announcing Project Nova, a series of zero power critical tests on Valar Atomics' Nova Core in collaboration with Los Alamos NCERC and NNSS. Nova went critical for the first time this morning at 11:45am.

Excited to announce this morning that Mo Shahzad, former President and CFO of Relativity Space, has joined Valar Atomics as President and CFO. Valar Atomics is at a major inflection point, and I’m thrilled to have Mo on our team as we take the next steps in our journey.

New Scale. More Capacity. We've secured $104M to scale satellite production to 2 ESPA-class satellites/day. Proud to welcome @RiotVentures, @GVteam, @Lux_Capital, the @EU_EIC Fund & @shrugVC on our mission to streamline access to space data. More: endurosat.com/news/endurosat…










The Valar Atomics team and Kiewit are proud to announce our groundbreaking at the San Rafael Energy Research Center for Ward250, our first reactor! This is a major step on our mission to answer the President's call for three advanced reactors on American soil by July 4, 2026.









