Richard Costolo
Managing Partner & Co-Founder @ 01 Advisors
San Francisco, United States
Richard Costolo is a Series A investor at 01 Advisors in San Francisco focused on Software and Artificial Intelligence. Since October 2010, Dick has been the Chief Executive Officer of Twitter, where he was responsible for the growth and management of the overall business. Previously, as Twitter’s Chief Operating Officer, he oversaw monetization and day to day operations.Before joining Twitter, Dick was co-founder and CEO of FeedBurner, a digital contentsyndication platform that was acquired by Google in 2007. While at Google, Dick was Group Product Manager on the Ads team responsible for social media ads.Previously, Dick lived and worked in Chicago, where he founded and ran two digital media companies: SpyOnIt, a web page monitoring service, and Burning Door Networked Media, a web design and development consulting company. Dick was also an improv performer with the acclaimed Annoyance Theater.He graduated from the University of Michigan with a B.S. in Computer Science.
- Total investments:
- 66
- Last investment:
- Lead investor:
- 24%
Last updated:
For AI agents: llms.txt
Industries Richard Costolo invests in
Stages Richard Costolo invests in
Countries Richard Costolo invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $3M–$12M
- Series A
- $4.8M–$35M
- Series B
- $21M–$80M
Investment Focus
Industry
- Software 17 (26%)
- Artificial Intelligence 15 (23%)
- SaaS 9 (14%)
- Information Technology 7 (11%)
- Big Data 5 (8%)
Stage
- Series A 15 (23%)
- Series B 13 (20%)
- Seed 9 (14%)
- Series C 9 (14%)
- Series D 6 (9%)
Country
- United States 43 (65%)
- Canada 1 (2%)
- France 1 (2%)
- United Kingdom 1 (2%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Render offers the easiest cloud for developers and teams to host any application or website. The company’s goal is to completely eliminate the need to manage servers by offering a cloud with the best developer experience combined with incredible flexibility and power. This will ultimately improve all software and enable entirely new kinds ofapplications. Render was founded in 2018 and is based in San Francisco. | $100M / Series C / Feb 17, 2026 | ||
| Micro1 offers a platform that converts human expertise into structured datasets and recruitment processes for companies using AI. It provides a Data Engine that handles the recruitment of experts and manages human-in-the-loop operations to generate data used in post-training of AI models. It also provides Zara, an AI recruiter agent, whichdiscovers, vets, and qualifies talent globally for enterprises and large-volume recruitment firms. The company maintains a Research Lab that publishes studies related to evaluating AI-assisted recruitment, speech-to-text systems, proctoring models, and other aspects of human-data integration into AI systems. It delivers APIs to access its human-data services and recruiter tools. | $35M / Series A / Sep 12, 2025 | ||
| Attio is an AI-native CRM platform for go-to-market teams. It helps manage customer relationships, automates workflows, and provides data-driven reporting. The service automatically enriches data from connected sources like email and calendars. | $52M / Series B / Aug 26, 2025 | ||
| Linear allows the user to manage software development and track bugs. Built for speed and efficiency.The founders started Linear from their own frustrations building software projects in successful high-growth companies like Airbnb, Coinbase and Uber. The founders wanted to create the tools that focus us and its team in making progress, not getin the way. Tools that are fast and efficient. Speed and performance were the main things Linear focuses on early on and keep focusing on that. | $82M / Series C / Jun 10, 2025 | ||
| BuildOps enables subcontractors to run their entire business on one software solution that manages their invoicing & billing, scheduling, estimates, proposals, payments, workflows, custom forms, financial reporting, and more. Our industry leading cloud-based solution allows you to improve your operations and efficiency, driving profitabilitythrough best-in-class technology. BuildOps has been uniquely designed and built by a team of subcontractors & world-class engineers. www.buildops.com | $127M / Series C / Mar 21, 2025 | ||
| Baseten provides a platform for training, deploying, and serving artificial intelligence models in production environments. It supports open-source, fine-tuned, and custom models, converting them into API endpoints with capabilities such as autoscaling, observability, and optimized model serving. The platform manages infrastructure componentsincluding containerization, GPU scheduling across multiple cloud providers, and performance optimizations to support large-scale inference workloads. Baseten also offers preconfigured model APIs and deployment options that can run either on its managed cloud service or within a customer's own environment. Its tools are designed to help developers build, manage, and scale AI applications while maintaining flexibility in how models are hosted and executed. | $75M / Series C / Feb 19, 2025 | ||
| Render offers the easiest cloud for developers and teams to host any application or website. The company’s goal is to completely eliminate the need to manage servers by offering a cloud with the best developer experience combined with incredible flexibility and power. This will ultimately improve all software and enable entirely new kinds ofapplications. Render was founded in 2018 and is based in San Francisco. | $80M / Series C / Jan 21, 2025 | ||
| Attio is an AI-native CRM platform for go-to-market teams. It helps manage customer relationships, automates workflows, and provides data-driven reporting. The service automatically enriches data from connected sources like email and calendars. | $33M / Series B / Aug 28, 2024 | ||
| Linear allows the user to manage software development and track bugs. Built for speed and efficiency.The founders started Linear from their own frustrations building software projects in successful high-growth companies like Airbnb, Coinbase and Uber. The founders wanted to create the tools that focus us and its team in making progress, not getin the way. Tools that are fast and efficient. Speed and performance were the main things Linear focuses on early on and keep focusing on that. | $35M / Series B / Sep 14, 2023 | ||
| BuildOps enables subcontractors to run their entire business on one software solution that manages their invoicing & billing, scheduling, estimates, proposals, payments, workflows, custom forms, financial reporting, and more. Our industry leading cloud-based solution allows you to improve your operations and efficiency, driving profitabilitythrough best-in-class technology. BuildOps has been uniquely designed and built by a team of subcontractors & world-class engineers. www.buildops.com | $50M / Series B / May 18, 2023 | ||
| See all 66 investments → | |||
Co-Investors
About 01 Advisors
01 Advisors is a venture and advisory firm helping founders go from building a product to building a company. The firm was founded in 2018 and is headquartered in San Francisco, California.
01 Advisors Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Adam Bain
Co-Founder & Managing Partner
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Richard Costolo
Managing Partner & Co-Founder
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FAQ
What does Richard Costolo invest in?
Richard Costolo invests primarily in Software, Artificial Intelligence and SaaS startups, most often at Series A and Series B stage. Most of the 66 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Richard Costolo's check size?
Richard Costolo typically joins rounds of $3M–$12M at Seed, $4.8M–$35M at Series A and $21M–$80M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Richard Costolo participates in.
How do I contact Richard Costolo?
Public channels for Richard Costolo include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Richard Costolo last invest?
The most recent investment recorded for Richard Costolo closed in Feb 2026. Shizune tracks 66 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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