Greylock Partners

Greylock Partners

Venture capital funding and founder support

Overview

Greylock Partners is a venture capital firm that funds and supports the creation of technology companies. It invests money in startups and then works closely with founders, offering resources, mentorship, networks, and operational help to help them grow and scale. Unlike some investors that only provide capital, Greylock emphasizes an entrepreneur-first approach and provides hands-on guidance across stages, often leveraging its global presence in Silicon Valley, Boston, Israel, and India to connect portfolio companies with talent, customers, and partners. The firm distinguishes itself with a long track record since 1965, having funded hundreds of companies and produced more than 150 IPOs, including notable names like Facebook, LinkedIn, Red Hat, Workday, Zipcar, and many others. The goal is to help founders build market-leading, sustainable businesses that achieve lasting impact and successful exits.

About Greylock Partners

Simplify's Rating
Why Greylock Partners is rated
A-
Rated A on Competitive Edge
Rated A on Growth Potential
Rated B on Differentiation

Industries

Venture Capital

Company Size

51-200

Company Stage

N/A

Total Funding

$28B

Headquarters

Menlo Park, California

Founded

1965

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Simplify's Take

What believers are saying

  • Greylock backed Anthropic, Wiz, and Revolut, validating access to category-leading companies.
  • The July 2026 fundraise signals LP confidence and fresh capital for next-generation AI startups.
  • Oak's $60 million seed, co-led by Greylock, shows continued conviction in AI security infrastructure.

What critics are saying

  • Reid Hoffman stepped back in January 2026, reducing Greylock's most visible brand leverage.
  • Greylock's concentration on seed and Series A leaves returns exposed to slower exits through 2028.
  • AI competition from Sequoia, Andreessen Horowitz, and Benchmark compresses access to top founders in 2026.

What makes Greylock Partners unique

  • Greylock closed Greylock 18, a $1.5 billion early-stage fund, on July 14, 2026.
  • Greylock's 10 partners make one or two new investments annually, enforcing selectivity.
  • Greylock combines operator expertise with executives like Glenn Kelman joining as EIR in June 2026.

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Funding

Total Funding

$28B

Above

Industry Average

Funded Over

0 Rounds

Benefits

Competitive salaries

Health Benefits (Medical, Dental and Vision)

Pension

401(k) Retirement Plan with Match

Educational Assistance, Tuition Reimbursement and Student Loan Assistance

Baby on Board Program

Wellness Program

Generous Paid Time Off

Day Care Assistance

Short/Long Term Disability, Life and AD&D Insurance

Flexible Spending Accounts: Health and Dependent Care Options

Accident & Critical Illness Insurance

Employee Assistance Program (EAP)

Employee Banking Benefits

Opportunities for growth

Company News

Obsidian Security
Aug 6th, 2026
Ex-Cylance tech chief raises $9.5M for new cybersecurity startup Obsidian Security

A new cybersecurity startup called Obsidian Security has raised $9.5 million in Series A funding from Silicon Valley venture capital firm Greylock Partners. The previously unannounced company was founded by several cybersecurity industry veterans, including the former chief technology officer of Cylance. Fortune first reported the news of the startup's formation and funding round.

Yahoo Finance
Aug 4th, 2026
Obsidian Security raises $85M at $1.1B valuation amid surging demand for AI agent security

Obsidian Security has raised $85 million in Series D funding at a $1.1 billion valuation, led by Crescent Cove Advisors. The round addresses growing demand for AI agent security as businesses increasingly grant autonomous software access to sensitive enterprise data. The funding comes amid heightened concerns over AI safety. OpenAI recently disclosed that one of its models escaped testing environments, whilst Anthropic reported an experimental agent breached enterprise systems during internal testing. Chief executive Hasan Imam said nearly 70% of Obsidian's customers already allow AI agents to interact with business data. The company will use proceeds to expand its platform, which monitors AI agents across applications including Microsoft Copilot Studio and Salesforce Agentforce. Existing investors Greylock Partners and Menlo Ventures also participated.

Bloomberg
Jul 17th, 2026
Inside Greylock's $1.5 Billion AI Playbook

Jul 17th, 2026 Inside Greylock's $1.5 billion AI playbook. Greylock has raised a new $1.5 billion fund to invest in the next generation of AI startups. Greylock partner Saam Motamedi joins Bloomberg to discuss why he believes the biggest AI companies are still waiting to be built, where venture capital is flowing, and why it's too soon to write off OpenAI and Anthropic despite growing competition from China's Moonshot. He joins Ed Ludlow on "Bloomberg Tech." Top video. Available on:

Greylock Partners
Jul 15th, 2026
Introducing oak: the ai-native Identity Operating System.

Introducing oak: the ai-native Identity Operating System. Article written by: Mor works with early stage Israeli founders, particularly in cybersecurity and enterprise AI. Published: Share via: An AI-native platform that governs every identity across an organization. Identity has become the largest unresolved problem in enterprise security. Legacy tooling built to govern it (IGA, IAM) was designed for a static world of human users and periodic certification. Two shifts have broken that model. First, machine and AI-agent identities now vastly outnumber human ones by more than 100 to 1, and that ratio is compounding as agentic AI spreads through the enterprise. Second, AI has made it possible to operate on identity data at a coverage and speed that manual, rules-based systems cannot approach. We believe this has opened a rare window to consolidate a fragmented, multi-billion-dollar market around a single platform, and Oak has assembled a well equipped team to do it. The Oak founding team has worked this problem from the inside for years. From our first conversation with Shai Morag, it was clear we were meeting an exceptional founder: he brought the urgency and hunger of someone with everything still to prove, paired with hard-won experience that comes from having already built and sold three security companies. He is joined by co-founder and CPO Tal Marom, who led product teams at Tenable and Salesforce, alongside a bench of identity and AI veterans drawn from the industry's best security companies and elite technology units. Oak is building an AI-native platform that replaces the fragmented stack of legacy identity governance and security tools with a single, continuously updated control plane: one that governs every identity across an organization, whether human, machine, or AI agent. Oak emerges from stealth today with $60 million in seed financing co-led by Greylock, Accel, and CRV. We're privileged to partner with Shai, Tal, and the entire Oak team as they build the Identity Operating System for the AI era. To learn more, or to join them, visit oak.id.

TechCrunch
Jul 15th, 2026
Backed by $60M in funding, Oak steps out of stealth to fix the identity mess that AI agents are making worse | TechCrunch

Co-founded by serial entrepreneur Shai Morag, Israeli identity management startup Oak is emerging out of stealth with $60 million in seed funding.

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