# Topsort

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/topsort

- Industry: Software
- Headquarters: Palo Alto, US
- Website: www.topsort.com
- Total disclosed funding: $23M
- Latest round: Series A (Nov 29, 2023)
- Investors on record: 6

## About

Based in California, US, and founded in 2021, Topsort Inc. is a marketplace and multi-brand retailer-focused auction-based advertising infrastructure. Regina Ye (CEO), Francisco Larrain (CTO), and Michael Ostrovsky (CSO) are the co-founders of the company. In November 2025, Topsort Inc. raised an undisclosed amount of venture funding from new investor W23.

The company provides an auction-powered API that accelerates marketplace growth, from multi-brand retailers and marketplaces, to create better relevancy, and margin by democratizing access to modern marketplace technology. The firm's proprietary technologies include auto-pacing, real-time performance, bid suggestion, auto-bidding, and return guarantee. Topsort focuses on payments, click fraud, customizable reporting, and GDPR compliance. 

The company will use the November 2025 funding to support its expansion plans initiatives.

## Funding rounds

- Series A, Nov 29, 2023, $15M — Pear VC, Quiet Capital, Upload Ventures, RX Ventures
- Seed, Feb 11, 2022, $8.3M — Pear VC, FJ Labs, Quiet Capital, Comma Ventures
- Seed, Apr 26, 2021 — FJ Labs

## Investors

- FJ Labs (https://capitalatlas.ai/funds/fj-labs) — Seed
- Pear VC (https://capitalatlas.ai/funds/pear-vc) — Seed, Series A
- Quiet Capital (https://capitalatlas.ai/funds/quiet-capital) — Seed, Series A
- Comma Ventures — Seed
- Upload Ventures — Series A
- RX Ventures — Series A