
Sierra Ventures
1400 Fashion Island Blvd, Suite 1010, San Mateo, CA, 94404, United States
Overview
Sierra Ventures is a Bay Area-based early-stage venture firm investing globally with a focus on Next Generation Enterprise and Emerging Technologies. With over three decades of experience and over $2 billion of assets under management, Sierra has created a vast network of successful entrepreneurs, Global 1000 CXOs, operational executives, and deep domain experts, providing a platform for entrepreneurs around the world. Sierra Ventures primarily invests in Seed and Series A rounds, with a preference to lead investment rounds and reserve capital for follow on rounds. Investment sectors include artificial intelligence/machine learning, big data, cloud, fintech, health tech, IoT/infrastructure, marketplaces, SaaS & enterprise apps, security, and emerging technologies such as 5G, devices, blockchain, robotics, and virtual reality / augmented reality. Sierra Ventures typically makes initial investments between $500,000 and $7 million on average and invests between $500,000 and $15 million over the life of an investment. The firm has invested in leading companies such as Intuit, Invensense, Greenplum, MakeMyTrip, OnLink, Teradata, StrataCom, Sourcefire, Treasure Data, and more. Sierra Ventures was founded in 1982 and is based in San Mateo, California.
- Total investments
- 184
- Lead investments
- 57
- Investments · 12mo
- 13
- Active investors
- 10
Sector focus
- Finance
- Financial Services
- Venture Capital
Investment portfolio
- Smallest.ai
Participated · Series A · Jul 2026
Smallest.ai develops small, specialized voice models designed to mimic human conversational behavior by listening, thinking and speaking simultaneously for near-zero response lag. The company’s models focus on voice-specific nuances such as diverse accents, dozens of languages and robustness in noisy environments. When queries exceed the small model’s knowledge, Smallest.ai routes the request to a larger foundational LLM and briefly places the user on hold to “research” the issue. The startup targets enterprise customer-support and voice companies and lists RingCentral and Truecaller as customers. Smallest.ai was founded in late 2024 and has raised over $21 million in total funding. The current Series A proceeds are being used to advance its small-model approach and scale commercial adoption.
- Phosio
Participated · Seed · Jun 2026
Phosio develops high refractive index metal oxides and a proprietary thin-film thin-film platform designed to integrate display functionality directly into everyday eyewear. The technology aims to reduce cost, bulk, and power demands of current AR display systems to enable all-day wearable glasses at consumer-friendly price points. The company was co-founded by CEO Omid Sadeghi, Cory Perkins, and materials scientist Douglas Keszler and brings together expertise in advanced materials science, optics, and semiconductor manufacturing. Phosio highlights team experience that includes former Meta personnel and members of the early scale-up team from Inpria. Financially, Phosio recently raised a $4 million seed round led by MESH with several strategic investors to accelerate commercialization. The company is engaging partners across the semiconductor and consumer electronics ecosystems as it moves toward commercial production.
- Band
Participated · Seed · Apr 2026
Band provides a unified interaction layer and runtime control plane for multi-agent systems, enabling agents to discover one another, exchange context, delegate tasks, and collaborate across frameworks, clouds, enterprises, partners, and personal environments. Its platform offers structured communication and delegation, cross-framework interoperability without rewriting agents, human-in-the-loop oversight, agent discovery, and built-in governance to enforce policy and visibility. The company positions its product to convert isolated agent deployments into coordinated, production-ready systems and to support coordination across internal systems, SaaS platforms, and partner environments. Early adopters are using Band for multi-agent workflows in planning, coding, testing, monitoring, enterprise automation, and advanced R&D. Band announced a $17M seed round to fund engineering expansion, product acceleration, and growth of its design partner ecosystem.
- Gitar
Participated · Equity · Apr 2026
Gitar provides a subscription platform that deploys AI agents to orchestrate code-quality operations such as automated code reviews, continuous integration workflow management, security checks, and maintenance tasks. Founded by Ali‑Reza Adl‑Tabatabai, the company positions itself around "code validation"—ensuring generated or human-written code is trustworthy before shipping. Gitar allows engineering teams to create custom agents that run security and maintenance operations on their behalf. The CEO envisions automated validation reducing the need for human review to exception cases while speeding shipping. The company is two years old and is based in San Mateo. Gitar competes in a crowded automated code-review space but aims to differentiate by focusing on validation rather than code generation. With the $9 million financing, Gitar plans to hire across engineering and product and to build the systems necessary to operate its services at scale.
- ArmorCode
Participated · Equity · Mar 2026
Based in Palo Alto, ArmorCode offers an Agentic AI Platform that aggregates and prioritizes security findings across applications, code, cloud, infrastructure and AI systems, enabling security teams to move from fragmented data to policy-driven, auditable remediation. Its solutions span Application Security Posture Management, Vulnerability Management, Software Supply Chain Security, and the newly announced AI Exposure Management product. The platform processes more than 200 billion findings annually through hundreds of native integrations and is already used by Fortune 500, Fortune 1000 and Global 2000 enterprises. Nearly 80 percent of existing customers are driving the company to deepen its AI security capabilities, and the business has doubled year-over-year. Future plans include expanding the Agentic AI Platform via the Anya Agentic Framework, broadening MCP server support, and growing global go-to-market and partner programs across North America and EMEA. The company has now raised a total of $81 million to fund these initiatives and recently added noted cybersecurity leader Phil Venables to its board.