
@KatieSi
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Mom of 3 & @tacopuppy. Founder & GP @MoxxieVentures. Co-founder @hashtagangels. Alum of @Twitter @WhiteHouse @Google @color @yahoo. Board @Vivendi @Yahoo 🎸🌎🌱
San Francisco, CA
Joined December 2009
- Tweets32.4K
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- Followers112K
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⚡️ Some news! I’m thrilled that my long-time colleague, co-investor and friend, @aroetter, has joined @MoxxieVentures full-time and we’ve raised an $85M Fund together!
❤️ Huge thanks to @thatHRVguy for sharing wisdom on heart health, longevity, and the power of understanding our bodies. Loved the insights on stress, recovery, and how small daily habits can have an outsized impact on our health. Also thanks @marycminno, Treehub and @FirstCitznInnov for cohosting with @MoxxieVentures!
🇺🇸 Watching the @BlueAngels is equal parts awe, inspiration and gratitude.
💥 Another big announcement and launch for @MoxxieVentures today: @phinity_ai
Phinity is an applied research lab building the infrastructure that teaches AI models how to design, verify, and tape out chips. They’re using AI to fundamentally change how we design the chips that power AI itself. ⚡
I have never seen a company grow this fast in such a short period of time. Phinity went from 0 to 8 figures in just a few months. The market pull is extraordinary, the product execution is incredible, and the briliant team led by Sonya Jin and Aadi Nashikkar have assembled is world-class.
So proud to back this team alongside @uncorkcap bestie @amy icon @MarHershenson @pearvc and legend @JeffDean.
🚀 AI software is moving at incredible speed. Hardware design hasn’t caught up. That’s why we invested in @phinity_ai, building autonomous AI agents that design, test, and optimize chips.
We’re proud to back @sonyashijin @aadi_nash + team alongside @Uncork @Pear & @JeffDean
Not all of our investments @MoxxieVentures are personal but this one is. Having navigated clinical trials with a family member, I’ve seen firsthand how complex and challenging the system can be, not just for patients and families, but for the people working incredibly hard behind the scenes. It made me appreciate how much better infrastructure can matter in helping important research move faster. I'm so proud to be part of the Peppermint journey and so grateful to @peppermintdavid and VJ T. for building this crucial product to help the people advancing life-changing research spend more time on what matters most. 🙏
No offense, @Madonna, but I'm @guyoseary's biggest fan. 😉 I'm psyched to be part of what Guy, @mcgunome and the team @getaccess are building!
The best companies benefit from having great people around the table, not just great capital. Get Access is building a new way to bring experienced operators and investors into some of the most exciting private companies.
Launching @GetAccess
Today we’re launching @GetAccess , a curated private markets investment platform designed to connect great companies with investors who bring both capital and the ability to help.
getaccess.com/newsroom/launc…
It will always be weird to me that people who benefited so much professionally and financially from Silicon Valley publicly shit on it so much. Criticism is healthy, but so is gratitude. 🙏
I'm an AI optimist, but there's a lot going on here that doesn't feel great.
🚨 NOW: Anthropic chief DARIO just walked up and said President Trump helped put his Super Intelligence worries at ease
"If we do this right, we work with the President and everyone here, we can win safely!"
Imagine that, all it took was DONALD J. TRUMP getting involved and the tables are turning!
No more SI dooming, no more surrendering to China.
America will remain number one BOTH for national and economic security, as long as Trump is president 👏🏻
When did comparing pdoom scores over dinner become as common as comparing sleep scores? Please tell me this is just Silicon Valley nerds.
There are tons of AI agents in healthcare, but who’s building the rails, the Okta + Plaid for healthcare AI agents: identity, consent, EHR access and audit trails?🙏⚕️
The future of work is putting all the AIs in a group chat and letting them passive aggressively manage each other. :) Fun project by my brilliant friend @ShaneMac!
I put Instinct in charge of Grokbot, Muse, and Codex in a private group chat.
It had to tell Grok Bot to stand down.
Then told Muse to go fact-check herself.
It just told Codex it's in 3rd place.
How they worked together blew my mind... They didn't even argue, they actually were apologizing to each other while pushing each other to do the job better.
Here's the video of the entire conversation.
I can’t unsee it. I don't care if there's a new agent every week, if they can just join the group chat.
Belated holy hell, this is a phenomenal product. Congrats @kellyschaefer and team!
Excited to share something I've been working on -
Muse!
It's an AI agent, but you need literally *no* technical chops to set it up. Been using it for flight price drops, finding furniture options, summarizing kids' school newsletter, and more: muse.ai
💜 This is going to be epic ⤵️
Stoked to bring back Yahoo all-time-high vibes
DB Live x @YahooFinance streaming this fall
More details on what I’m building: a daily, hour-long livestream in partnership with @YahooFinance
Live, online, interactive and based in San Francisco.
@sarafischer has the news here:
axios.com/2026/09/08/yahoo-f…












