A

Andreessen Horowitz

Venture capital firm investing across sectors

Executive Assistant

Full-TimePosted on 10/21/2026
No salary listed
Senior
Tokyo, Japan
In PersonOnsite in the Tokyo office 4–5 days a week.
Administrative & Executive AssistanceExecutive Support

About the job

Requirements
  • At least 5 years of high-level experience supporting multiple senior-level executives.
  • Work effectively in a collaborative, matrixed environment with individuals at all levels of the organization.
  • Manage multiple projects and deliver quality work to deadlines in a fast-moving, highly ambiguous environment.
  • Exercise discretion, diplomacy, and sound judgment when handling confidential and sensitive information.
  • Demonstrate exceptional attention to detail.
  • Have strong calendar management and prioritization skills.
  • Have advanced proficiency with Gmail, Google Calendar, Zoom, and AI tools.
Responsibilities
  • Build and cultivate long-term relationships.
  • Handle communications, inquiries, executive and founder relationships, and high-priority requests with discretion.
  • Provide proactive calendar management and complex scheduling in coordination with executive assistants across the firm, maintaining awareness of partner priorities and context to anticipate needs.
  • Support partnership meetings by creating internal and external pitch meeting invites, securing conference rooms, and coordinating with IT ahead of in-person meetings.
  • Organize executive travel to attend meetings and conferences.
  • Oversee small offsites and curated dinners, including venue identification, catering, program materials, and gifts. Support team operations by managing the swag process and assisting with offsite logistics.
  • Manage team lunches for the extended team on in-office days, including taking individual orders, delivering to desks, and accommodating varying headcounts.
  • Continuously improve administrative processes, anticipate needs, streamline workflows, and enhance executive support.

About the company

Andreessen Horowitz (a16z) is a venture capital firm that provides funding to startups from seed to growth across AI, bio and health, consumer, crypto, enterprise and infrastructure, fintech, games and American Dynamism. It invests through dedicated funds (growth, crypto, bio + health, infrastructure) and supports portfolio companies with operational resources and ecosystem connections, plus runs the a16z speedrun accelerator for early-stage startups. Its broad range of sector-focused funds, a wide geographic footprint, and extensive network differentiate it from many peers. Its goal is to back ambitious founders and help them scale from early stages to global companies.

Company Size

1,001-5,000

Company Stage

N/A

Total Funding

$329.3B

Headquarters

Menlo Park, California

Founded

2009

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Simplify's Take

What believers are saying

  • September 2026: Valon reached $2.3 billion valuation with a16z participation.
  • 2026: Armadin hit $2.5 billion valuation, validating a16z's AI security thesis.
  • 2026: Horowitz Andreessen Academy attracted Anthropic, Google, Meta, OpenAI, Nvidia, and Palantir.

What critics are saying

  • September 2026 SEC comments show a16z fighting regulation around crypto and tokenization.
  • The firm now chases education, defense, and hardware, stretching expertise across unrelated bets.
  • A 2027 AI funding reset breaks fee-earning momentum and shrinks carried interest.

What makes Andreessen Horowitz unique

  • September 2026: a16z launched Horowitz Andreessen Academy, turning brand into recruiting infrastructure.
  • August 2026: Machine Age raised $1.1 billion for chips, robotics, and storage.
  • a16z spans seed-to-growth, consumer-to-defense, and software-to-biotech under one platform.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Life Insurance
  • Disability Insurance
  • 401(k) Retirement Plan
  • Paid Vacation
  • Paid Sick Leave
  • Flexible Work Hours

Company News

MarketScreener
Oct 23rd, 2026
Bolt Biotherapeutics secures $120M from investors including a16z and Deep Track Capital

Bolt Biotherapeutics expects to raise about $120 million from a group of healthcare investors. It signed a Securities Purchase Agreement for 13,995.311 shares of Series D Non-Voting Convertible Preferred Stock at $8,574.30 each, for gross proceeds of $119,999,995. Investors include Deep Track Capital, ADAR1 Capital, Andreessen Horowitz, LYFE Capital, Coastlands Capital, Eventide Asset Management, Casdin Capital, Curie.Bio, SilverArc Capital, Soleus Capital, and Deviation Capital. The deal also includes warrants to buy up to 6,997,655 common shares at an exercise price of $8.5743 per share on an as-converted basis. Each Series D share converts into 1,000 common shares, subject to conditions. The financing is expected to close on October 26, 2026.

Bloomberg Law
Oct 20th, 2026
ASI raises $325M at $3B valuation in Spark-led round for AI that manages military and airline assets

ASI, a Boston-based startup previously known as Air Space Intelligence Inc., raised $325 million in a series C round that values it at $3 billion. Spark Capital led the round. Craft Ventures, Andreessen Horowitz, and affiliates of Citadel Securities, among others, also took part. The company is due to announce the deal Tuesday. ASI will use the money to expand its artificial intelligence system, which helps the military, airlines, and air-traffic controllers manage assets. The company is part of a resurgence in US defence and aerospace technology startups, which have drawn growing interest from investors and government agencies.

The Next Web
Oct 19th, 2026
Town raises $108M at $1B valuation to let AI assistants work as a team

Town, a San Francisco startup that gives each worker an AI assistant, has raised $108 million in a Series B at a $1 billion valuation. Forerunner Ventures and Menlo Ventures co-led the round, announced on Monday. Existing investors a16z and First Round Capital took part, along with Better Tomorrow Ventures, Precedent.vc, Scribble Ventures, Serena Ventures, and Sparked Ventures. Town is extending its assistants, called Townies, from individuals to teams. They can ask each other questions, hand off work, and share workflows, while sharing only what their person would share. Town launched publicly in June 2026 with a $55 million Series A. Since July, paying customers have grown fourfold and paying teams ninefold.

Axios
Oct 15th, 2026
Sharp Performance raises $18M Series A for first responder coaching

Sharp Performance, a coaching platform for first responders, has raised an $18 million Series A, chief executive officer Ben Curley told Axios. The round comes as venture investors increasingly back startups that sell technology to public safety agencies.

PR Newswire
Oct 14th, 2026
Labelbox raises $100M+ Series E to power reinforcement learning and enterprise AI agents

Labelbox, a San Francisco AI platform, has raised more than $100 million in Series E financing, including equity and a credit facility. Infinitum Partners led the round, with Wipro Ventures, Andreessen Horowitz, B Capital, Tau Ventures, Snowpoint Ventures, and others taking part. The company serves more than 400 customers, including over 90% of leading US AI labs. It reached profitability in 2026 while growing more than fivefold year over year. The money will fund research and engineering on two products, and help expand the teams that bring them to customers. Horizon provides reinforcement learning environments and evaluation tools for frontier AI labs. Recursion Managed Agents lets enterprises deploy AI agents that improve with each run. Labelbox opened Recursion Managed Agents to enterprise customers earlier this month.