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Altimeter Capital | RoundOS

01 · Free data roomBuild, share and track important documents.

Data room analytics Document Analytics Pitch Deck Tracking Secure sharing Permissions NDA & agreements Watermarking Versions Branding

View all Data Room features →

02 · AI Fundraising CRMRun the work between investor meetings.

Today & next moves Follow-up Investor research Investor CRM Investor updates Imports & sources

View all Operator features →

See it workingOpen a live roomWalk a real RoundOS room.

Pricing Security

Deal rooms

Startups Venture capital M&A data room Investor relations

Beyond fundraising

Sales deals Board documents Due diligence Real estate

Fundraising

Fundraising hub Pre-seed Seed Series A

Learn

Blog Funding Customer stories Investor room template

Compare

All alternatives Best free data rooms Best DocSend alternatives Digify alternative iDeals alternative

Free tools & templates

Calculators and fundraising tools. No signup.

SAFE, dilution, runway, pipeline coverage, investor fit.

Sign inExploreData Room AI Fundraising CRM Pricing Security Document Analytics Pitch Deck TrackingData Room featuresData room analytics Secure sharing Permissions NDA & agreements Watermarking Versions BrandingUse casesFundraising hub Startups Venture capital M&A data room Investor relations Sales deals Board documents Due diligence Real estate Pre-seed Seed Series AOperatorToday & next moves Follow-up Investor research Investor CRM Investor updates Imports & sourcesMoreCustomer stories All alternatives Best free data rooms Investor room template Free tools Blog Funding Integrations

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AC

Altimeter Capital

Activity from announced rounds

Activity in this selection View all activity

Activity in this selectionOct 4, 2026 · Developer tools · Jan 1, 2026

Rounds participated in: 2
Confirmed lead rounds: —
New companies: 2
Funding in participating rounds: $1.6B

By stage

Series C+2

By primary sector

AI2

By country

United States2

Rounds

2 in this selection

Jun 22

Builds systems software for AI applications, powering inference and multi-model strategies

$1.5BSeries F

Role not disclosed

May 18

Sigma Computing

Provides a spreadsheet-style agentic analytics platform for enterprises to build AI apps on cloud data warehouses

$80MSeries E

Role not disclosed

1–2 of 2

Most frequent co-investors

Spark Capital2 shared 01A1 shared Avenir Growth Capital1 shared Battery Ventures1 shared Blackbird1 shared Conviction1 shared D1 Capital Partners1 shared Databricks Ventures1 shared

RoundOS

A free data room for modern deals, with an AI operator that runs the fundraise.

Create a free room

01 · Explore

Data Room AI Fundraising CRM Pricing Security Document Analytics Pitch Deck Tracking

02 · Data Room

Data room analytics Secure document sharing Data room permissions NDA & agreements Dynamic watermarking Document versions Custom branding

03 · Operator

Fundraising hub Pre-seed fundraising Seed fundraising Series A fundraising Fundraising follow-up Investor research Investor updates Integrations

04 · Use cases

Startup data room VC and LP data room M&A data room

D. E. Shaw Ventures

1 shared

Durable Capital Partners1 shared

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