Ayan Agarwal (@ayanagarwal0) profile picture

investing @AltimeterCap / former founder @ycombinator views are my own, no investment advice

San Francisco, CA
Joined January 2016
Photo by Ayan Agarwal (@ayanagarwal0)
Excited to lead Anthropic's Series H and to continue our partnership with them. We believe this team has built one of the most consequential companies of this era, and they're just beginning to show what this technology can do. Excited for what's ahead.
We are thrilled to lead @AnthropicAI Series H! Anthropic is making intelligence ubiquitous and transforming how industries are thinking about operating. We have been in awe of their capacity to metabolize hard things and make it look easy, whether that's unlocking research breakthroughs, shipping products, or driving compute efficiency. We believe the Anthropic team has built something rare: a culture where mission, talent, and velocity are perfectly aligned. That foundation allows them to redefine what’s possible in AI. What also stands out is the simultaneous speed and precision of their execution. Claude has become the default operating system for entire enterprises, powering coding, reasoning, and complex workflows at a scale we've never seen before. We believe their ability to ship high-performance systems while also pushing the frontier on safety and alignment is unmatched. Huge congrats to the entire Anthropic team. Deeply honored to continue to partner with you as you continue to set the standard for what safe and powerful intelligence can be. What Anthropic has accomplished is one for the history books, and yet the best is still ahead. 🚀 @altcap @paulinebhyang @ayanagarwal0
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Ayan Agarwal retweeted
Bigger ambitions in space demand a step change in power and propulsion. 20.6kW on orbit. 4x more powerful than ANY Hall thruster previously flown in space. A remarkable milestone for @K2Space and a glimpse of what’s coming. P.S. some nice artistry with the gimbal 😈🤌
With a 20.6kW burn, we just shattered the record for highest Hall thruster burn ever completed on orbit – four times more powerful than any thruster that has ever flown in space. And that’s just the beginning. We’re continuing to test and refine our in-house, custom-designed avionics and propulsion systems for next year’s launches. Below, our gimbal moves our thruster while it fires in our vacuum chamber. Of course, we couldn’t resist the opportunity to draw our Dyson sphere logo, which represents the abundant space future that we’re aiming for as we push the bounds of what’s possible in space.
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Ayan Agarwal retweeted
Introducing Synthetic Hospital: an open, fully synthetic longitudinal EHR benchmark with verifiable ground truth! 1,268 patients, 5,602 encounters, zero PHI. Physicians could not reliably distinguish its charts from real ones. 📄 arxiv.org/abs/2609.30027 💻 github.com/sparkcpark/synthe… ✍️ sparkcpark.github.io/posts/f…
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was back at @ycombinator for S26 alumni demo day last week! couple things stood out: 1. Bar for hiring becoming a lot higher. Most companies don't see growth as gated by headcount, so they're hiring less and paying each hire more (3-5% vs. ~1% equity a few years ago) 2. So many founders are building AI infra hardware that there's talk of YC negotiating bulk fab allocation on behalf of future batches. Could be a huge differentiator for founders. Definitely a sign of the times... 3. Most companies I met are building on OAI rails. Seemed mostly driven by OAI's generous startup deal: $500K of free credits, plus an offer to invest 7 figures, paid in credits rather than cash. Still TBD how sticky those workloads are. 4. Defense tech was the most apparent theme. I think more founders were selling to the Ukrainian ministry of defense than to consumers (cc @lacker) 5. Founders with progress taking advantage of a hot market. First time I've seen tranched seed rounds coming out of YC! YC has done a great job reinventing itself for the biggest themes today arond hardware / AI / reindustrialization. Congrats to all the s26 founders on a killer batch.
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Ayan Agarwal retweeted
Excited for Altimeter portfolio company @HQ_Covenant to emerge from stealth with $250m in funding and ~$150m in orders. Deep precision strike is one of the most critical capability gaps facing the West. Covenant has built Anthem to close that gap and meet the need for long-range, heavy payloads, precision, and mass production. Proud to back Michael and the truly special Covenant team as they bring Anthem to the world.
Today, Covenant is emerging from stealth and introducing Anthem: a heavy-payload deep precision strike capability designed for mass production, with deliveries beginning in the thousands in 2027. We’ve raised $250 million, flown Anthem in more than 200 tests, and secured approximately $150 million in orders, including contracts with the U.S. Army, U.S. Navy, and key international allies. We’re building Anthem at our 105,000-square-foot production facility in Dallas, alongside factories in Germany and Israel. Covenant is backed by @a16z, @foundersfund, @Lux_Capital, @lightspeedvp, @8vc, @aleph, and @AltimeterCap. Deep precision strike is the biggest gap in the arsenal of the West, and we spent the last two years building Anthem to fill it. Now we deliver at scale.
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Ayan Agarwal retweeted
Castelion is proud to announce our $1 billion Series C. We’re growing fast and our mission hasn't changed: build the weapons required to deter the next major war, affordably, rapidly, and at massive scale. This funding accelerates Blackbeard production, develops a longer-range strike system, and starts work on defensive systems. Thank you to @JPMorgan Chase's Strategic Investment Group, @a16z, @OneCarlyle, @lightspeedvp, @LavrockVC, @AltimeterCap, @TRowePrice, @generalcatalyst, and #Interlagos for backing that work. castelion.com/news/series-c/
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Ayan Agarwal retweeted
GLM 5.2 has taken the world by storm! Open Source, Frontier Level performance, Lower Cost, Greater Control. Checkout our first episode of First Pass featuring @simon_mo_ , CEO of @inferact, breaking down why GLM-5.2 matters and what it means for builders!
Introducing: First Pass! Altimeter's new video series breaking down the latest trends in AI, hosted by myself and @palak_go AI evolves so quickly. We wanted to create a series of short (~10 minute) videos taking a First Pass on the latest trends First up: @simon_mo_ on GLM5.2
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Back at @ycombinator for alumni demo day yesterday - a couple things that stood out: 1. Talent shifting from software to hardware. Saw repeat / exited SaaS founders in the batch now building in atoms. Moving where the immediate opportunities & bottlenecks are. 2. “Build something agents want” - PLG has become agent-led growth. Teams building to get picked and consumed by agents, not humans 3. Computer-use agents are eroding moats. If agents operate software like humans, startups don't need to integrate with incumbents and can’t be “locked out” via API. e.g. healthcare startups grabbing data from hospital EHR 4. Schleps are back! so many founders opened conversations with "i know this is super unsexy, but...". I think many software founders have stopped trying to out-build the labs, and are instead going after the ugly, defensible segments instead. Focused on deep proprietary data, heavy workflows, etc. These companies had crazy revenue numbers so seems to be working! 5. Founders working with the government vs. around it. Old YC instinct (imo) was to route around the regulator and ask forgiveness vs. P26 teams in energy, airspace, defense partnering with agencies from day one. In general, heard govt is leaning in + moving faster than founders expected thanks @garrytan for the (last min) invite and congrats on a killer batch. Good luck to p26 tomorrow!
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CNBC EXCLUSIVE: Anthropic now sitting right under a $1T valuation according to the latest Series H financing. Altimeter's @paulinebhyang helping lead the funding round. Hear why she thinks OpenAI and Anthropic can be multi-trillion dollar winners over time: cnbc.com/video/2026/05/29/an…
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"there is reason for optimism: in our new world, the victors will be those who are best suited to deliver mass and apply advanced technologies to their future force." excited to continue supporting the optimists @anduriltech
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Ayan Agarwal retweeted
Major commercial validation for @K2Space, partnering with @SES_Satellites to deliver high-power satellites for its next-gen MEO network. Tranche 1’s initial deployment of 28 satellites will effectively double SES’s network capacity, enabled by K2 Mega, a new class of satellite that is bigger, higher power, more flexible, and built for scalable production. Next-gen constellations require a step-function change in power and scale. K2 is delivering it.
I’m excited to share that @K2SpaceCo is on contract to deliver 28 satellites to @SES_Satellites for meoSphere, SES’s next-generation MEO network. This program reflects a shift we’ve believed in from the beginning: that satellite networks of the future will require significantly more power, flexibility, and scalability than legacy architectures were designed to support. The initial batch of 28 K2 high-power satellites will effectively double SES’s networks capacity. Over time, we will continue to build on this foundation together, to deliver new levels of performance to MEO and support the growing demands for sovereign, secure, and high-throughput connectivity. We’re proud to support SES as they push forward a truly multi-orbit, multi-mission network. Thanks to @adel_al_saleh for helping to share the news!
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Back at @ycombinator for alumni demo day and you could feel the difference. Observations as a founder-turned-investor: 1. W26 is shipping way faster than earlier batches. Floored by companies that pivoted in the last few weeks with real products and customers. I attempted a late pivot in the S21 batch and it was… not like that 2. Spending more on tokens than headcount. Many 2-person teams consuming over $75K of tokens / month with no signs of slowing down. 3. First hires are increasingly in sales / commercial engineer roles, not “pure” devs. Distribution > engineering. 4. Crazy traction, and it’s not just "YC ARR”. Founders running sales / success / support agents are showing up to enterprise conversations looking like mature orgs. Lots of healthcare, banking, govt logos across the batch. 5. Valuations reflect all of this. Most teams raising at $30-40M vs ~$20M just a year or two ago. Love seeing founders get rewarded for speed, progress, profitability. 6. And a fun surprise: tons of deeptech love! Robotics, energy, drug discovery - YC branching out in a positive way. Most importantly: founders still love YC. Reuniting with my batchmates (five years later!) and supporting W26 founders means more than I can put into a tweet.
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Replying to @MetloHQ
@MetloHQ repo went from 119 stars on Thursday to 400 today (Monday)! :)
Congrats to metlo-labs/metlo, which has grown by 260 stars in the last 7 days and has reached 393 stars. Thanks to the contributors: @SukhaniShri ossinsight.io/analyze/metlo-… #TypeScript
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Ayan Agarwal retweeted
Hundreds of Y Combinator alumni join crypto collective to back Web3 startups tcrn.ch/35lEocQ by @lucasmtny
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