Kyle Mack

CEO of @MiddeskHQ

[Kyle Mack @KyleTMack]

Yesterday we posted what @MiddeskHQ found when we cross-referenced the @DOGE_HHS dataset against our business identity infrastructure.

300K+ views later, people are asking: what does this fraud actually look like up close? 🧵

[Kyle Mack @KyleTMack]

HHS just open-sourced the largest Medicaid dataset in history. About $1T in claims data, free for anyone to analyze via @DOGE_HHS. Everyone's looking at what was billed. At @MiddeskHQ, we're looking at who's behind the billing.

Here's what we found 🧵

[Everett Cook @everettcookny]

Starting today, incorporating on @rhobusiness is free.

You can form your company and open a Rho business account in one step, and it takes as little as 10 minutes.

How it works: Open a Rho account and deposit $10K in your first 90 days. You'll then receive a refund on the incorporation fee.

We want to make 2026 a record for new business creation - and break the record in 2027 - one easy incorporation at a time.

[Kyle Mack @KyleTMack]

@sti_gian Not at the moment but @scoutstowe leads all things brand design for us, so you two should connect

[Kyle Mack @KyleTMack]

My Chief of Staff is leaving to start her own company, so I'm hiring!. Looking for someone who founded a company or was early at one that scaled to tens of millions in revenue. Reports to me. NYC, in office 3x/week.

https://t.co/f8Myxu5EOE

[Kyle Mack @KyleTMack]

@stephzhan Lets go!

[Kyle Mack @KyleTMack]

I've been lucky to partner with @stephzhan for the last six years.

She's been demanding and supportive, helping us to push the business from the first iteration of the product to the thousandth customer.

Excited for what's next for you!

[Stephanie Zhan @stephzhan]

I’m starting a new early-stage AI fund, doing what I love: partnering with founders from company formation on bold bets, long before consensus.

The fund’s LPs will include Sequoia, Jeff Dean, Sachin Katti, Philip Wong (my Stanford professor and Chief Scientist adviser to TSMC), and others whose work has shaped our industry and how I think about AI’s future.

I’ll remain a partner at Sequoia and keep serving on my boards on Sequoia’s behalf.

Sequoia has been my home for the past 11 years. I joined as the youngest investor the firm had ever hired. I grew up here. Through years of intense debate and shared work, I found lifelong mentors and friends who took me under their wing and taught me this craft. They taught me to aim high and take big swings. I’ll carry that into what I build: outsized ambition, relentless truth-seeking and curiosity, and a refusal to become complacent.

Working alongside founders has made me want to build something of my own: a firm shaped from day one around the convictions I’ve developed over the past decade.

Life has taught me not to take time for granted. This is how I want to spend mine.

Why now

We’re seeing a new way of building companies in today’s AI era. Research and products often advance together. A breakthrough can open a market or accelerate a business far faster than expected. Some companies require extraordinary capital and compute early on. Others reach meaningful scale with remarkably small teams. The rules for how big these businesses can get, and how fast, are being rewritten.

But early on, the technology is unproven, the resources required enormous, and the vision seemingly implausible.

This is what I love most: seeing the potential right from the beginning, and helping founders realize their full scale of ambition.

More than ever, it starts with an extreme willingness to believe early, with bold, independent conviction in a founder’s technical insight before any product or market validation. Then, it means helping founders take the biggest swings, giving the rare, long-term patience to see those bets through uncertainty, ambiguity, and turbulence, and serving as a level head when the stakes are highest.

I learned this kind of partnership at Sequoia. It’s the foundation of the firm I’m building.

Believing before consensus

My fascination with AI’s potential took root at Stanford in the early-to-mid 2010s, studying computer science and working in Andrew Ng’s lab. The friendships I formed connected me to a community whose people and ideas would help shape modern AI and build some of our generation’s defining companies. What stayed with me was the gap between what those people saw was possible and what the wider world could imagine.

I’m drawn to founders pursuing ambitions that sound impossible today.

I start with a simple question: “What if everything goes right?”

Then we work backward together to make it happen.

In 2023, Deepak and Abhinav set out to build a general-purpose robot brain at @SkildAI, before physical AI was a consensus bet. Their sim-to-real breakthroughs gave me conviction where earlier robotics approaches had fallen short. But the data flywheel required deployment at scale. We made commercialization as urgent as research and brought in strategic partners like NVIDIA and SoftBank to support the ambition. Three years in, Skild is advancing the frontier of physical AI with nine figures in annualized revenue.

In 2024, Ioannis and Misha founded @reflection_ai with an insight into scaling reinforcement learning. As that grew into the ambition to build a Western frontier lab for open models, the hard question was how a startup competes with labs spending tens of billions. An introduction to NVIDIA and many compute calls and recruiting events later, the team has built Beam, now one of the leading US open models.

In 2025, Anna and Azalia, the co-creators of AlphaChip, founded @RicursiveAI to design models and hardware together. From day one, we made early customers and ecosystem partners a priority. Today, they are showing order-of-magnitude improvements on real workloads, working with some of the industry’s most consequential players, and reaching a defining inflection point.

The ambition keeps growing as these companies scale.

@linear has always had a kind of magic to it. Now it’s the system a new generation of AI companies builds on, for teams and agents alike.

@tavus saw early that we’d one day talk to AI the way we talk to each other. Today, it’s building the human computing interface for a world of AI colleagues.

@Mach_Industries began as hydrogen experiments in an MIT dorm room. It has since become one of the most exciting next-generation defense companies.

Making the ambition possible

Being a first believer is only the beginning. Compute falls through. A deep-pocketed incumbent makes your mission its top priority. A breakthrough changes the opportunity and the capital required overnight.

These are stomach-churning moments, and early belief carries a responsibility to help make the bet work.

This is the partnership I love: turning the full ambition into concrete steps. Raising capital, securing compute and strategic partners, recruiting exceptional people, and winning the first customers together. Thinking several moves ahead while solving what’s in front of us. And as breakthroughs open new possibilities, helping founders dream even bigger.

Thank you

To the founders I’ve worked with: thank you for trusting me and Sequoia to be your first partner and first believer. It’s been the joy of a lifetime, and I can’t wait to keep building together.

Thank you to Alfred and Pat for your leadership of Sequoia and your support of my next chapter. To Roelof, for bringing me into Sequoia and believing in me from the beginning. Alfred and Roelof, you have been mentors in investing and in life. So much of what I know, and the investor I’ve become, comes from your guidance and generosity over the years. To Bill, for the close partnership and wealth of knowledge, always wrapped in humility. To Shaun, for showing me how to think deeply and imaginatively. To Michael Moritz, for inspiring 22-year-old me to dream big. To Doug, for teaching me to keep things simple. To Bogie and Jess, for bringing joy to the everyday and perspective on what matters. And to all my Sequoia teammates, for the friendship, camaraderie, and lessons I’ll carry with me.

To my family, especially my husband and my brother, who have each started companies of their own: thank you for giving me the courage to take this leap.

Let’s get to work!

[Kyle Mack @KyleTMack]

Company formation, built into your product.

Coming soon.

More here: https://t.co/xrwtmdrkCA

[Parag Agrawal @paraga]

Agents need access to high quality data to be useful. With this product launch, our customers can consume a breadth of data sources via @p0 and our content partners can integrate with us more easily and drive increased use.

[Kyle Mack @KyleTMack]

@mandikarp @MiddeskHQ @GustoHQ Hey Amanda, CEO of Middesk here. Just saw this. Will look into what's going on.

[Kyle Mack @KyleTMack]

New fraud pattern we're seeing: fraudster finds real companies formed 2-3 years ago with no website, vibe codes websites for all of them, applies across the same 6 Middesk customers within a a few hour period.

Currently tracking ~70 companies being used to apply for banking and card products that fit this same fingerprint.

In some cases, the business owner is finding out, but not always. In one example dissolved their entity and left a note "IDENTITY FRAUD, SOMEONE TRIED TO OPEN ACCOUNTS USING OUR LLC" on the dissolution paperwork.

If you want a list of the company names being used to open these fraudulent accounts, DM me or reply in comments.

Also if you want to learn more about these patterns, come to our event Stratos on 9/22 in Brooklyn. You can register here: https://t.co/NTkKNfDdz1

[Kyle Mack @KyleTMack]

FinCEN just removed the closest thing the U.S. had to a federal source of truth for business ownership.

15M+ BOI reports for U.S. businesses are being thrown out. ~27.5M businesses that were expected to file now never will, meaning their ownership data will never be collected.

The most interesting part of the BOI rollback isn’t that 30M+ businesses no longer have to report their owners.

It’s the bet behind the policy: collecting beneficial ownership information from every legitimate business costs more than the value it creates in finding the bad ones.

That may be the right tradeoff.

But it puts a much higher bar on the systems we use to identify the businesses that actually warrant scrutiny.

Read more: https://t.co/Veoqv0qVS1

[Kyle Mack @KyleTMack]

I'm looking for someone to run growth at Middesk. We’re growing a lot and I need this person to use that momentum to push harder.

You'll own growth end to end, reporting straight to me; no layers, no red tape. DM me if this is you:

You have good instinct; you know what's working, what to kill, and what deserves dropping everything to double down on.
You’re creative and like to experiment.
You get shit done.
You spend too much time on X.

No resume needed - send me the best idea you've had OR the weirdest thing you've shipped that worked, and your LinkedIn profile.

If you refer someone we hire (or if this person is you), we’ll send you $5k.

DM me or email [email protected]

[Kyle Mack @KyleTMack]

Middesk 🤝 Docusign

[Middesk @MiddeskHQ]

Middesk is now in the @Docusign App Center.

Verify the business behind every agreement before anyone signs, inside the workflow you already use.

One workflow. Verification, agreement, signature.

https://t.co/jplGAN0Kdm

[Middesk @MiddeskHQ]

Middesk is now in the @Docusign App Center.

Verify the business behind every agreement before anyone signs, inside the workflow you already use.

One workflow. Verification, agreement, signature.

https://t.co/jplGAN0Kdm

[Kyle Mack @KyleTMack]

Is @NYCMayor good or bad for business?

New York business formations just hit an all-time high in March. Every policy out of City Hall now moves a live market, and you can trade it on @Kalshi.

Kalshi chose @MiddeskHQ as its official real-time settlement source for business formation.

We’ll be keeping a real-time read on the state of the business economy.

https://t.co/Q7kCzRgXrL

[Kyle Mack @KyleTMack]

Middesk just hit 70,000 all-time businesses registered for state tax accounts.

Q1 2026 is +180% Y/Y.

[Kyle Mack @KyleTMack]

Behind every great yes is the new @MiddeskHQ
https://t.co/zwWmSzmnU6

[Kyle Mack @KyleTMack]

Had a great chat with @ReggieCYoung about all things business identity, AI, and the future of @MiddeskHQ

[Middesk @MiddeskHQ]

AI models aren't the constraint for business identity. Business data is.

Middesk CEO Kyle Mack joined Reggie Young on Fintech Layer Cake (presented by Lithic) to talk about why automation in fintech depends on the quality of the identity layer beneath it.

Middesk works with roughly 400 government agencies across the U.S. to bring primary-source business data into onboarding and risk workflows. Without complete, reliable data, it's difficult to distinguish a fraudulent entity from a legitimate company that incorporated three days ago. And impossible to automate decisions with confidence.

That layer has to be right before anything else can scale.

https://t.co/RvYK0F05tV

[Kyle Mack @KyleTMack]

@typesfast What do you think will be the ways fraud will happen through the broader refund process?

[Kyle Mack @KyleTMack]

@imthemusic This is only one narrowly defined fraud pattern related to paying out to blacklisted providers

[Kyle Mack @KyleTMack]

@DOGE_HHS @MiddeskHQ 300K+ views later, people are asking: what does this fraud actually look like up close?

https://t.co/6TQTqtSwx6

[Kyle Mack @KyleTMack]

Yesterday we posted what @MiddeskHQ found when we cross-referenced the @DOGE_HHS dataset against our business identity infrastructure.

300K+ views later, people are asking: what does this fraud actually look like up close? 🧵

[Kyle Mack @KyleTMack]

HHS just open-sourced the largest Medicaid dataset in history. About $1T in claims data, free for anyone to analyze via @DOGE_HHS. Everyone's looking at what was billed. At @MiddeskHQ, we're looking at who's behind the billing.

Here's what we found 🧵