Today, one of our portfolio companies makes history. @SpaceX goes public on the Nasdaq under $SPCX, raising $75B at a $1.75T valuation. The largest IPO ever. Proud to have been part of this journey. Congratulations to the entire SpaceX team.

We sold out the Generous Ventures x Side Door Ventures Pre-Seed Investor Summit in NYC, bringing together an exceptional group of GPs and LPs from all over the world. Our team had an incredible time co-hosting this summit with Mike MacCombie. Can't wait for the next one!

Huge congratulations to the @coworkerapp team on today’s launch. Proud to support the journey at @sidedoor_vc and excited to see what the team builds next!

I gave a talk about my research progress so far at @spc! I recommend checking it out if you're trying to identify ways to be agentic about your care. Thanks team! I also gave an update on how Amy's living a completely normal life (not due to my research) :)

Introducing @runneragent, the knowledge work agent that works across all your apps to get real work done It's simply the best way to stay on top of messages, project management, user feedback, and much more Runner has become a daily driver for me and I think you'll like it too

I've known Aum (@aumup001) for nearly 7 years and hired him for my first company when he was a freshman at Columbia. It was evident within 60 seconds that he’s brilliant. One things I’ll never forget about his interview was the way he systematically dissected why we chose certain interview questions. He even thought commented that our sparsely decorated dorm looked like a therapist’s office when I asked the question, “do you have an ego?” His way of thinking is perfectly suited to security. Now, he and Eduardo (@EduardoVel36291) are building Silmaril, an always-on red team for agentic systems. I’m proud @sidedoor_vc was Silmaril’s first investor, and utterly unsurprised that @ycombinator invited them to join this batch. Excited to see them build!

Big moment for K2 Space. Excited to see this partnership come to life 🚀

Our team has been developing the key technologies for this approach for years, including capture mechanisms to constrain and move small asteroids and orbital debris. Accessing materials already in space could eventually enable a new generation of industries beyond Earth. If you're interested in the future of space resources, the articles are worth a read.

Today marks a major milestone for MYRIAD. We’re accelerating our vision in building sharper, deeper and more accessible information markets.

We have shipped our 20kW satellite - Gravitas - to the launch site. Given the supply chain to operate at this power regime doesn’t exist, we had to build 85% of the satellite in-house. This includes building our own large solar arrays, high power propulsion system, large batteries, large reaction wheels and much more. This launch will represent the first time all of these systems are test on orbit together. Internally at @K2SpaceCo, we’ve thought about a few levels of success for this mission - we expect mission success to fall somewhere along this spectrum: - Tier 1 (Baseline mission success): Deploy solar arrays, establish comms, operate the satellite —> we’ve now got an operational 20kW satellite on orbit - Tier 2: Power on the payloads, activate the 20kW propulsion system —> we’re completing payload missions and have fired the highest power hall thruster ever flown on orbit - Tier 3: Orbit raise the satellite, test performance in high radiation environments (like 2,000km) —> we’ve collected massive amounts of data on the performance of the platform in very very difficult environments More than anything, Gravitas represents the start of an iterative journey, where we will take the data we receive from this first satellite and incorporate it into the next wave of satellites launching next year. We’re excited to start this journey, we’ll report back as we get more data. Thanks to Tim for covering our story on TechCrunch techcrunch.com/2026/03/19/k2…

So You Want to Cure Your Own Disease. Today I'm publishing the guide I wish I'd had when Amy was first diagnosed. 🧵

Huge congratulations to Magna on their acquisition by Kraken (Payward). A strong validation of the team’s vision and execution. As Kraken expands its institutional offering ahead of its planned IPO, Magna’s technology will help power the next wave of tokenized projects.

One of the most common fundraising mistakes we see: Founders emailing 100 investors with the same deck. Better approach: ✔ Research stage + check size ✔ Review portfolio fit ✔ Understand lead vs follow preference ✔ Tailor your narrative You got this.

Good products solve problems. Great products remove friction people have learned to tolerate. The delta is usually in the unglamorous work: -Onboarding -Edge cases -Things users complain about quietly That’s where durable companies get built.

Early hires set the ceiling. The first 5-10 people define how decisions get made, how feedback flows, and what “good” actually looks like. We pay close attention to how founders think about hiring long before they need to scale it.

VC myth: You need everything figured out before you raise. Reality: We’d rather see clarity on the problem than polish on the story. In the early days, insight beats perfection every time.

We're going live today with our public launch and announced our $13M seed round. Coworker is the first AI agent that can do complex work across a company’s apps and data, thanks to a new memory architecture called OM1 This is the future of enterprise AI. Check us out: coworker.ai

Big congrats to @rodolfor, Hannah Earley, and the entire @VaireHQ team on this incredible milestone! Initial tests show ~50% energy recovery—potentially transformative given the explosive energy demands from AI workloads. Exciting times ahead! fortune.com/2025/05/20/uk-st…