Sierra

Series B SEC Form D Verified

Conversational AI agents for the world's most trusted consumer enterprises

sierra.aiSan Francisco, CA, USA

OpenAngels Score

96.8/ 100

High-Growth Scaleup

Capital RaisedVERIFIED

$110M

Post-Money: $4.5B Post-Money

Last Round: $110M (Series B)

Team VelocityRapid Scaling

65 Headcount

+40% headcount velocity

Open Roles: 4 strategic hires

Technology MoatDefensible

Deterministic supervision layer preventing hallucinations while executing transactional customer workflows

Stack: Python, TypeScript, PostgreSQL

Traction RadarAccelerating

High Scale

Enterprise Deployments

Clients: WeightWatchers, Sonos

Investment Signals & Growth Radar

DAY 8 Intelligence4 Verified Signals

Multi-Stream Growth Detection

⚡ High-Density Breakout96% Conf.

Every signal is synthesized from discrete observations across SEC Form D filings, verified headcount rosters, production changelogs, and cap table syndicate archives. Zero subjective AI speculation.

Signal Fusion Detected5 Synchronous Empirical Events

Breakout Velocity

⚡ COMPOUND: BREAKOUT VELOCITY

Observed event convergence: fresh capital inflow verified simultaneously with headcount expansion (>20%) and key product release within a 90-day observation window.

Observed Convergence Audit Trail (90-Day Observation Window)

🔥 Hiring accelerationVERIFIED

Expanded Core Platform Engineering (+40%)

Source: Verified Talent Index & Headcount Registry

💰 New fundingVERIFIED

Raised $110M at $4.5B Valuation led by Greenoaks

Source: SEC Form D / Lead VC Disclosure

🌍 Market expansionVERIFIED

Expanded Core Platform Engineering (+40%)

Source: Commercial Rollout & Regional Registry

🚀 Product launchVERIFIED

Deployed Autonomous Agents for Sonos & WeightWatchers

Source: Production Release Registry & API Telemetry

👥 Leadership changeVERIFIED

Co-Founded by Bret Taylor (Chairman of OpenAI)

Source: Corporate Leadership & Syndicate Filing

Non-Speculative Audit: Empirical observation across SEC & production registriesZero Investment Promotion Policy

💰 ROUND

2024-10-28•99%

Audited Empirical Evidence

Investor Decision Rationale

Source: Greenoaks Capital DisclosuresTIER 1

👥 LEADERSHIP

2024-02-13•99%

Audited Empirical Evidence

Investor Decision Rationale

Source: Founders DisclosureTIER 1

🚀 PRODUCT

2024-06-12•97%

Audited Empirical Evidence

Investor Decision Rationale

Source: Sierra Customer SpotlightTIER 1

🔥 HIRING

2024-09-01•91%

Audited Empirical Evidence

Investor Decision Rationale

Source: LinkedIn TalentTIER 1

Company Overview

Enterprise generative AI company deploying conversational customer experience agents with deterministic enterprise safety guardrails and system integrations.

Leadership & Founding Team Pedigree

Bret Taylor

Co-Founder

Chairman of OpenAI, Former Co-CEO of Salesforce, Former CTO of Facebook

Clay Bavor

Co-Founder

Former VP of Labs & Google Lens at Google (18-year Google vet)

Verified Claims & Lineage (Day 4 Engine)

CLAIM ↓ VALUE ↓ SOURCE ↓ EVIDENCE ↓ STATUS

Company Timeline & Change Detection Radar

DAY 7 Temporal Engine4 Monitored Events

Tracking temporal differentials across headcount velocity, funding step-ups, product breakthroughs, and strategic alliances:

⚡ DETECTED SIGNAL2024-10-28

0.99% Confidence

Closed $110M Financing at $4.5B Valuation

Audited EvidenceChain: Event → Evidence

Greenoaks Capital led round with Iconiq and Thrive participating.

Source: SEC Form D & Reuters

Date: 2024-10-28•5-Point Verified

⚡ DETECTED SIGNAL2024-02-13

0.99% Confidence

Public Launch out of Stealth

Audited EvidenceChain: Event → Evidence

Emerged from stealth with $110M raised to tackle enterprise customer service.

Source: TechCrunch

Date: 2024-02-13•5-Point Verified

⚡ DETECTED SIGNAL2024-06-12

0.97% Confidence

Enterprise Customer Milestone

Audited EvidenceChain: Event → Evidence

Live enterprise agents resolving over 80% of customer support workflows.

Source: Sierra Customer Report

Date: 2024-06-12•5-Point Verified

⚡ DETECTED SIGNAL2024-09-01

0.91% Confidence

Core Systems Headcount Acceleration

Audited EvidenceChain: Event → Evidence

Recruited 16 senior distributed systems and safety engineers.

Source: Talent Scanner

Date: 2024-09-01•5-Point Verified

Prominent Investors & Syndicate Backers

Investors who participated in Sierra's funding rounds. Click to open verified contact details and due diligence profiles:

Greenoaks Capital Benchmark Sequoia Capital Iconiq Capital

Founder Pitch & Syndicate DecoderActionable Strategy

When discussing CX agents with enterprise syndicates, emphasize founder pedigree, deterministic guardrails, and enterprise ARR retention.

Pitch Syndicate Co-Investors (Greenoaks Capital)