# Upwind Raises $400M at $3.8B Valuation

> Upwind rejects Datadog's $4B buyout bid after raising $400M at $3.8B valuation.
- Title: Upwind Raises $400M at $3.8B Valuation · Dealroom | Shortify
- Summary: Upwind rejects Datadog's $4B buyout bid after raising $400M at $3.8B valuation. Upwind, a cloud and AI security startup, raised $400 million in Series C…
- Keywords: upwind, datadog, series c, cloud security, ai security, funding, valuation, acquisition, startups, business, Raises, 400M
- Source: Dealroom — https://dealroom.co/news/167712-upwind-raises-400m-at-3-8b-valuation-rejecting-datadogs-buyout-bid
- Published: 2026-10-28T16:20:22+00:00
- Read time: 1 min
- Topics: upwind, datadog, series c, cloud security, ai security, funding, valuation, acquisition, startups, business
## What's the deal?
Upwind, a San Francisco- and Israel-based cloud and AI security startup, raised $400 million in a Series C round led by Bessemer Venture Partners at a $3.8 billion valuation.
## Why now?
The round lands less than nine months after Upwind's $250 million Series B, which valued it at $1.5 billion in January 2026.
## What could go wrong?
Upwind rejected a roughly $4 billion acquisition offer from Datadog, betting its value will climb further.
## Key takeaway

Upwind, a cloud and AI security startup, raised $400 million in Series C funding at $3.8 billion valuation, rejecting Datadog's $4 billion acquisition offer.