04 / THE BURROW

The Burrow.

Deal memos, founder interviews, market notes, and the occasional rant. We publish every two weeks. 6,247 readers.

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BURROW · 011Founder Q&A

Mossback's Dr. Sarah Chen on growing leather in a basement

The Series A founder on bootstrapping for 18 months, breaking her own freezer twice, and why mushrooms are inevitable.

MARCO D. · APR 712 min
BURROW · 010Market

The vibe shift in seed pricing (Q1 '26 data)

Median seed pre-money down 18% YoY. We pulled 412 deals across our network and break down what's happening, what isn't, and what we're doing about it.

MAYA Z. · MAR 309 min
BURROW · 009Thesis

Three reasons we're wrong about climate tech

We've put 22% of Fund III into climate. We may be premature. Here are the three counter-arguments we lose the most sleep over.

TOMÁS R. · MAR 2211 min
BURROW · 008Deal memos

Pass: why we said no to a $40B "AI for accountants"

The pitch was good. The team was great. The market is huge. We still didn't do it. A post-mortem on a pass.

MAYA Z. · MAR 158 min
BURROW · 007Behind the scenes

Inside the partner meeting where we picked our 47th company

Live transcript of the 90-minute IC meeting, names redacted. The vote was 4–1 in favor. Yes, we publish these.

TOMÁS R. · MAR 815 min
BURROW · 006Market

Why retail VC actually works (probably)

The academic case against retail VC, in three studies. Then our (somewhat sketchy) argument that the data doesn't apply to us.

MAYA Z. · MAR 113 min
BURROW · 005Founder Q&A

Acorn Labs' CTO on shipping open-source tax LLMs

On hiring lawyers as engineers, why their training set fits on a single SSD, and the actual best language model for IRS Form 8606.

MARCO D. · FEB 2210 min
BURROW · 004Thesis

The Velvet Rope Tax: a brief history of accreditation

A 12,000-word history of why a 1933 New Deal-era statute is the reason your dentist can't invest in Stripe.

TOMÁS R. · FEB 1422 min
BURROW · 003Deal memos

How we got into Tunnelvision's Series A (and almost didn't)

A polite, then increasingly desperate, account of getting allocation in an oversubscribed round at 2 a.m.

MAYA Z. · FEB 76 min
BURROW · 002Market

The "AI bubble," debunked, qualified, and then re-bunked

Yes. No. Maybe. Probably. We don't know. Here's how we're positioning the fund regardless.

TOMÁS R. · JAN 3114 min
BURROW · 001Behind the scenes

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MAYA Z. · JAN 173 min
That's the lot, for now.

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