The $1B Fundraising Playbook

Startup Playbooks

The $1B Fundraising Playbook

Every Round, Investor and Valuation Behind the 10 Fastest-Raising AI Companies (+ The Investment Theses behind)

Guillermo Flor

Oct 27, 2026

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BREAKING: Hyphenate just raised $45M in Series A funding to bring AI agents to corporate finance.

The round was led by Nexus Venture Partners.

Hyphenate is building an autonomous finance platform where AI agents execute workflows across revenue, treasury, and accounting, reducing manual work for finance teams.

The numbers behind the raise:

86x revenue growth

in 12 months

11x customer growth

over the same period

90% of routine finance work

handled by its agents across the platform

Customers already include Groupon, Synthesia, and Mini Melts.

Announcement Here

Harvey has raised nine rounds in less than four years. The last one, in September, valued it at $15.5B.

It isn’t the only one moving this fast:

OpenEvidence went from $1B to $15B in 19 months, across five rounds

Legora raised $550M twice in seven months, the second time this week

Cognition went from $26B to $48B between May and September

These companies raised because their products grew faster than anything investors had seen. But who they let in first, when they went back to market and how much of the company they sold were decisions the founders made.

📚 So we went through every round of the 10 AI startups that raised the most, the fastest (AI labs excluded). For each one: the dates, the amounts, the valuations, who led, what the founders did around each round and all the

investment theses

.

Full document at the end!

Refer a friend

Inside you will find:

The Fastest-Raising AI Startups:

Cognition

Find out how a launch video became a $2B valuation, and how it got to $48B +

a16z’s Investment Thesis by Marc Andreessen

Cursor

See how a seed from OpenAI’s fund turned into $29.3B in 25 months, and a $60B exit +

a16z’s and Accel

Investment Thesis

Harvey

Learn how nine rounds, almost always with a new lead, took it from $5M to $15.5B +

Sequoia’s Investment Thesis

Sierra

Find out how two founders with a track record started at $1B and reached $15.8B +

ICONIQ’s Series C

Investment Thesis

Legora

See how a Stockholm team raised $1.1B in 2026 alone and filled its last round with pre-IPO investors

+ ICONIQ, GC, Bessemer, Accel, Menlo’s

Investment Theses

OpenEvidence

Learn how a repeat founder raised five rounds in 19 months, with a different lead almost every time +

Sequoia’s Investment Thesis

Lovable

See how Lovable went from a $1.8B Series A to $13.3B in 13 months

+ Creandum, Accel & Menlo’s

Investment Theses

ElevenLabs

Find out how a first round at a $9M valuation became $22B, with tender offers in between +

a16z and ICONIQ’s

Investment Theses

Mercor

Learn how three 22-year-olds went from $250M to $10B in 13 months

+ General Catalyst’s Investment Thesis

Decagon

See how it tripled its valuation in seven months, and why it is now talking to buyers

+ Accel, a16z, Index’s

Investment Theses

The Fundraising Playbook for Your Next Round

Learn the moves to copy, from the first check to growth rounds.

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