Gustaf Alstromer
Group Partner @ Y Combinator
San Francisco, United States
Gustaf Alstromer is a partner at Y Combinator. Before joining Y Combinator he spent 4.5 years at Airbnb where he worked as a Product Lead on the Growth team, a team he helped start in 2012.
- Total investments:
- 175
- Last investment:
- Lead investor:
- 62%
Last updated:
For AI agents: llms.txt
Industries Gustaf Alstromer invests in
Stages Gustaf Alstromer invests in
Countries Gustaf Alstromer invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $500k–$8.6M
- Pre-Seed
- $500k–$500k
- Series A
- $13M–$43M
Investment Focus
Industry
- Artificial Intelligence 33 (19%)
- Software 24 (14%)
- B2B 11 (6%)
- SaaS 11 (6%)
- Health Care 9 (5%)
Stage
- Pre-Seed 49 (28%)
- Seed 22 (13%)
- Series A 7 (4%)
- Series B 2 (1%)
- Funding Round 1 (1%)
Country
- United States 53 (30%)
- Canada 3 (2%)
- Singapore 2 (1%)
- Spain 1 (1%)
- France 1 (1%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Terminal provides telematics data infrastructure for the commercial fleet industry. The platform connects software companies, insurers, fleet operators, and other businesses with vehicle data from multiple telematics providers through a unified integration layer. It manages data ingestion, provider integrations, consent workflows, and data deliveryto support fleet management, insurance, fuel services, and transportation applications. | $20M / Series A / Jul 29, 2026 | ||
| AI accounting for enterprise finance teams | $3.4M / Seed / Jul 08, 2026 | ||
| Stilta offers AI software for patent practitioners to search prior art, draft filings, monitor competitors, and assess portfolio value. | $10.5M / Seed / May 19, 2026 | ||
| Vapi is a platform that allows the integration of applications and services. It enables users to create, manage, and monitor APIs. It also supports developers in building solutions and facilitates collaboration between teams. Vapi serves industries such as technology, finance, healthcare, and logistics. | $50M / Series B / May 12, 2026 | ||
| AfterQuery provides high-quality human-generated datasets which are further used to finetune AI systems. | $30M / Series A / Apr 09, 2026 | ||
| Cofia builds AI software that learns user workflows, generates task automations, and executes repetitive work. | $500K / Pre-Seed / Mar 24, 2026 | ||
| Terminal Use offers a platform to build, deploy, and manage AI agents with filesystem access, orchestration, and execution infrastructure. | $500K / Pre-Seed / Mar 24, 2026 | ||
| AutoSitu builds Co-ordinated AI agents to provide expert-level guidance and catch issues for real estate development. | $500K / Pre-Seed / Mar 24, 2026 | ||
| Panta Insurance Services offers liability, property, worker's compensation, cyber and tech, and commercial auto insurance. | Seed / Mar 24, 2026 | ||
| Stilta offers AI software for patent practitioners to search prior art, draft filings, monitor competitors, and assess portfolio value. | $500K / Pre-Seed / Mar 24, 2026 | ||
| See all 175 investments → | |||
Co-Investors
About Y Combinator
Y Combinator is a startup accelerator that provides funding and mentorship to early-stage companies. It offers a program where startups receive guidance from experienced entrepreneurs and investors. The organization helps founders in their business models and develop their products. Y Combinator serves industries such as technology, healthcare, andfinance.
Y Combinator Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Boris Jabes
Visiting Partner
|
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Luther Lowe
Head of Public Policy
|
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Max Kolysh
Visiting Partner
|
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Brad Flora
Group Partner
|
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Calvin French-Owen
Visiting Group Partner
|
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FAQ
What does Gustaf Alstromer invest in?
Gustaf Alstromer invests primarily in Artificial Intelligence, Software and B2B startups, most often at Pre-Seed and Seed stage. Most of the 175 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 Gustaf Alstromer's check size?
Gustaf Alstromer typically joins rounds of $500k–$8.6M at Seed, $500k–$500k at Pre-Seed and $13M–$43M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Gustaf Alstromer participates in.
How do I contact Gustaf Alstromer?
Public channels for Gustaf Alstromer include LinkedIn, X (Twitter) and Facebook. 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 Gustaf Alstromer last invest?
The most recent investment recorded for Gustaf Alstromer closed in Jul 2026. Shizune tracks 175 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 Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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