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:
- 183
- Last investment:
- Lead investor:
- 63%
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 88 (48%)
- Software 62 (34%)
- Information Technology 35 (19%)
- B2B 20 (11%)
- SaaS 20 (11%)
Stage
- Pre-Seed 127 (69%)
- Seed 37 (20%)
- Series A 12 (7%)
- Series B 2 (1%)
- Funding Round 1 (1%)
Country
- United States 123 (67%)
- Canada 4 (2%)
- Germany 4 (2%)
- Singapore 3 (2%)
- United Kingdom 3 (2%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Insurf provides AI-based tools for managing prior authorizations, denial appeals, and health plan cost modeling. | $500K / Pre-Seed / Sep 10, 2026 | ||
| Billow AI is an AI-powered platform focused on automating accounts receivable (A/R) collections, primarily for law firms. | $500K / Pre-Seed / Sep 10, 2026 | ||
| Rapidfolio provides AI agents for fintechs and banks to automate compliance, risk, and back-office operations with deterministic execution. | $500K / Pre-Seed / Sep 10, 2026 | ||
| Pango is an AI-native e-commerce logistics platform that automates deliveries, tracking, and returns | $500K / Pre-Seed / Sep 10, 2026 | ||
| Conifer provides AI routing gateway that optimizes token spend by intelligently routing queries across local hardware and cloud models. | $500K / Pre-Seed / Sep 10, 2026 | ||
| Torus provides AI engineering software that automates workflows and validates technical documents using engineering data analysis. | $500K / Pre-Seed / Sep 03, 2026 | ||
| 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 | ||
| See all 183 investments → | |||
Co-Investors
About Y Combinator
Y Combinator invests a standard amount of capital in exchange for equity and through uncapped safe agreements. Participants engage in a three-month intensive cycle that focuses on product development and preparations for fundraising. The firm offers access to a private networking platform for knowledge sharing and hosts events featuring speakers from various sectors. This program culminates in a presentation event where founders showcase their businesses to a curated group of investors.
Y Combinator Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Boris Jabes
Visiting Partner
|
|||
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 Information Technology startups, most often at Pre-Seed and Seed stage. Most of the 183 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 Sep 2026. Shizune tracks 183 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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