Brian Halligan
Co-founder & Partner @ Propeller
Cambridge, United States
Brian Halligan is a seed investor at Propeller in Cambridge focused on Software and SaaS. Brian Halligan is the Co-Founder and Chairperson at Hubspot. He is also the Co-founder and Partner of Propeller. Brian Halligan attended MIT Sloan School of Management and the University of Vermont.
- Total investments:
- 18
- Last investment:
- Lead investor:
- 39%
Last updated:
For AI agents: llms.txt
Industries Brian Halligan invests in
Stages Brian Halligan invests in
Countries Brian Halligan invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Software 9 (50%)
- SaaS 5 (28%)
- Artificial Intelligence 5 (28%)
- Information Technology 3 (17%)
- FinTech 2 (11%)
Stage
- Seed 6 (33%)
- Series A 4 (22%)
- Pre-Seed 2 (11%)
- Series B 2 (11%)
- Series C 1 (6%)
Country
- United States 14 (78%)
- France 1 (6%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Rillet
|
Rillet is an AI-native ERP that automates accounting for complex revenue models, allowing for fast book closings and providing a reliable source of truth. The solution covers the full spectrum of accounting and finance needs, including customer invoicing, GAAP-compliant revenue recognition, automated bank reconciliations, accrual-based expenserecognition, real-time SaaS metrics, and other analytics capabilities. Rillet covers multiple entities, geographies, and currencies and allows for consolidated multi-currency reportin,g all embedded within one platform. | $100M / Series C / Aug 17, 2026 | |
Rogo
|
Rogodevelops an artificial intelligence platform designed specifically for financial institutions such as investment banks, private equity firms, and asset managers. The platform integrates with internal systems and external financial data sources to analyze large volumes of information, including filings, market data, and proprietary datasets, anddeliver structured outputs like financial models, reports, and presentations. It uses AI models and agent-based systems to automate workflows such as research, due diligence, and market analysis, enabling users to complete multi-step financial tasks within a single system. The company’s technology is built with input from professionals with backgrounds in finance and is tailored to reflect the workflows and requirements of high-finance environments. Its tools are used by financial professionals to reduce manual work, support decision-making, and streamline processes across transactions and portfolio management. | $160M / Series D / Apr 29, 2026 | |
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Rogo
|
Rogodevelops an artificial intelligence platform designed specifically for financial institutions such as investment banks, private equity firms, and asset managers. The platform integrates with internal systems and external financial data sources to analyze large volumes of information, including filings, market data, and proprietary datasets, anddeliver structured outputs like financial models, reports, and presentations. It uses AI models and agent-based systems to automate workflows such as research, due diligence, and market analysis, enabling users to complete multi-step financial tasks within a single system. The company’s technology is built with input from professionals with backgrounds in finance and is tailored to reflect the workflows and requirements of high-finance environments. Its tools are used by financial professionals to reduce manual work, support decision-making, and streamline processes across transactions and portfolio management. | $75M / Series C / Jan 28, 2026 | |
Serval
|
Serval is an AI-native IT service management (ITSM) platform designed to give modern teams superpowers. | $75M / Series B / Dec 11, 2025 | |
|
Rogo
|
Rogodevelops an artificial intelligence platform designed specifically for financial institutions such as investment banks, private equity firms, and asset managers. The platform integrates with internal systems and external financial data sources to analyze large volumes of information, including filings, market data, and proprietary datasets, anddeliver structured outputs like financial models, reports, and presentations. It uses AI models and agent-based systems to automate workflows such as research, due diligence, and market analysis, enabling users to complete multi-step financial tasks within a single system. The company’s technology is built with input from professionals with backgrounds in finance and is tailored to reflect the workflows and requirements of high-finance environments. Its tools are used by financial professionals to reduce manual work, support decision-making, and streamline processes across transactions and portfolio management. | Venture - Series Unknown / Oct 28, 2025 | |
Juicebox
|
Juicebox provides an AI platform that automates talent search, candidate engagement, and recruiting workflows. The platform features AI agents that source profiles from various data and run automated, personalized outreach sequences. It offers tools for talent discovery, real-time market insights, and integration with existing CRM and ATS systems. | $30M / Series A / Sep 24, 2025 | |
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Rillet
|
Rillet is an AI-native ERP that automates accounting for complex revenue models, allowing for fast book closings and providing a reliable source of truth. The solution covers the full spectrum of accounting and finance needs, including customer invoicing, GAAP-compliant revenue recognition, automated bank reconciliations, accrual-based expenserecognition, real-time SaaS metrics, and other analytics capabilities. Rillet covers multiple entities, geographies, and currencies and allows for consolidated multi-currency reportin,g all embedded within one platform. | $25M / Series A / May 28, 2025 | |
Agency AI
|
Agency AI helps to manage workflows of B2B Customer Success teams | $12M / Seed / Oct 17, 2024 | |
Greenly
|
In this new era where C02 emissions management has gone mainstream, Greenly allows companies to become frontrunners of the energy transition, building in-house capacity to track and reduce their emissions, more precisely and more simply. In stark contrast to one-shot consulting services, Greenly offers the first comprehensive carbon accounting& management platform, allowing companies to track and reduce their GHG emissions and set a course for Net Zero. Greenly combines technology and expertise to deliver simple and reliable GHG protocol compliant carbon disclosure reports, Net Zero strategies in line with SBTi. We help procurement departments implement sustainable purchasing policies, score and engage their suppliers on their Net Zero strategy, and decarbonize their supply chain. Greenly's unique product offering is to offer an industry-specific approach to tracking emissions, rolling-out activity based tracking apps for key verticals: freight, electricity, cloud, inventory management, financed emissions, etc... Learn more on www.greenly.earth | $52.5M / Series B / Mar 20, 2024 | |
Harvey
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Harvey is an artificial intelligence technology service provider. | $21M / Series A / Apr 11, 2023 | |
| See all 18 investments → | |||
Co-Investors
About Propeller
Propeller operates as a climate-tech fund that invests in and builds ocean-climate companies.
Propeller Contacts
| Name | Phone | Socials | |
|---|---|---|---|
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Brian Halligan
Co-founder & Partner
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Kevin Walsh
Entrepreneur In Residence
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Devdutt Yellurkar
Co-founder & Partner
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FAQ
What does Brian Halligan invest in?
Brian Halligan invests primarily in Software, SaaS and Artificial Intelligence startups, most often at Seed and Series A stage. Most of the 18 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Brian Halligan?
Public channels for Brian Halligan 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 Brian Halligan last invest?
The most recent investment recorded for Brian Halligan closed in Aug 2026. Shizune tracks 18 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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