# Bill Yu

> Bill Yu is a seed investor backing Artificial Intelligence and E-Commerce. See 8 investments, check sizes, portfolio and contact details. Updated Oct 2026.

- Type: Angel Investor
- Location: San Mateo, United States
- Total investments: 8
- Last investment: Jan 2023
- Lead investor: 0%
- Last updated: Oct 2026
- LinkedIn: https://www.linkedin.com/in/williamskyu/

Bill Yu is a seed investor in San Mateo focused on Artificial Intelligence and E-Commerce. Bill Yu is the Partner and Early Investor of the Employee Stock Option Fund. He attended The Johns Hopkins University.

## Contacts

5 contacts available for Bill Yu: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/bill-yu?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Artificial Intelligence | 3 | 38% |
| E-Commerce | 2 | 25% |
| CRM | 1 | 13% |
| Energy | 1 | 13% |
| Gaming | 1 | 13% |

28 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 5 | 63% |
| Pre-Seed | 3 | 38% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Photon Commerce | Photon Commerce cuts the costs of payment processing by 25% by unlocking line item level data from invoices, receipts, and payments. Fintech and eCommerce leaders double their acquisition of customers and merchants, while gaining visibility, understanding, and predictive power into customer purchases. |  | Seed | Jan 10, 2023 | https://www.photoncommerce.com/ |
| inBalance | We use machine learning to accurately forecast electricity prices. Our customers, including a global renewable asset manager, use our software to improve revenue by millions of dollars per year. |  | Pre-Seed | Jun 01, 2021 | https://inbalanceresearch.com |
| inBalance | We use machine learning to accurately forecast electricity prices. Our customers, including a global renewable asset manager, use our software to improve revenue by millions of dollars per year. | $1.6M | Seed | Mar 22, 2021 | https://inbalanceresearch.com |
| Beacons | Beacons is a link-in-bio website builder for creators. The company’s mobile website builder offers extensive customization options and supports multi-SKU creators through donations, e-commerce, affiliate marketing, and more.Founded in 2019, Beacons is used by hundreds of thousands of creators on TikTok, Instagram, Twitter, and other socialplatforms. |  | Seed | Feb 10, 2021 | https://beacons.ai |
| Copy.ai | CopyAI is a startup building AI-powered copywriting tools for business customers. The automated tools enable users to generate marketing copy in seconds. CopyAI's platform features social media primary text, headlines, link descriptions, blog ideas, and more, enabling digital agencies, copywriters, and eCommerce brands to save time and improveconversion rates. |  | Pre-Seed | Dec 28, 2020 | https://www.copy.ai |
| StartPlaying | StartPlaying.Games are a marketplace for hiring hosts for social tabletop games like Dungeons and Dragons. DMs for Hire! Meant to help new players learn to play, or help existing players find experienced hosts. Hosts set their own prices. Currently seeing a GMV of over $10k per month. | $125K | Seed | Aug 24, 2020 | https://startplaying.games/ |
| Dex | Dex is a personal CRM. You sync up your contacts/calendars, and it finds the people you haven’t kept in touch with and reminds you to reach out. You can add notes about a contact — like what you last spoke about, or what’s going on in their life — to help with the conversation next time you see them. | $150K | Pre-Seed | Aug 19, 2019 | https://getdex.com |
| Rewbi | Rewbi is a Renewable Energy Power Generation and storage firm using AI to optimize grid battery storage. |  | Seed |  | https://www.rewbi.com/ |

8 of 8 investments shown.

## Co-investors
- [Y Combinator](https://shizune.co/investors/profile/y-combinator) — VC Fund, 3 deals together
- [Cold Start Ventures](https://shizune.co/investors/profile/cold-start) — VC Fund, 2 deals together
- [Kiyoko Osone](https://shizune.co/investors/profile/weclikd) — VC Fund, 2 deals together
- [Centre Street Partners](https://shizune.co/investors/profile/centre-street-partners) — VC Fund, 1 deal together
- [Employee Stock Option Fund](https://shizune.co/investors/profile/eso-fund) — VC Fund, 1 deal together
- [Hike Ventures](https://shizune.co/investors/profile/hike-ventures) — VC Fund, 1 deal together

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund

## FAQ

### What does Bill Yu invest in?

Bill Yu invests primarily in Artificial Intelligence, E-Commerce and CRM startups, most often at Seed and Pre-Seed stage. Most of the 8 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 Bill Yu?

Public channels for Bill Yu include LinkedIn. 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 Bill Yu last invest?

The most recent investment recorded for Bill Yu closed in Jan 2023. Shizune tracks 8 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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