How much funding has S4E.io raised?

S4E.io has raised $500K in total. Its most recent round was a Pre-Seed in August 2025.

How many people work at S4E.io?

About 29, down 9% over the last 30 days.

Who are S4E.io's competitors?

Hadrian, ZeroFox, and Praetorian are among the closest in Attack Surface. The full competitive set, with overlap scoring, is in the platform.

S4E.io

Attack SurfaceAnkara, Turkeyfounded 2021private

S4E.io is a cybersecurity company specializing in Attack Surface, founded in 2021 and headquartered in Ankara, Turkey. It has raised $500K in total funding, employs about 29 people, and is privately held.

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updated Aug 22, 2026

The record

What S4E.io did, dated.

Dec 2025Feature launchS4E.io Launches Free Online Website Security Check Feature

selected events only — the full dated record (7 events since Aug 2025) lives in the platform

Momentum

24 out of 100.

Momentum blends hiring, funding, traffic and sentiment into one score, recomputed daily. The score is free; the pillars behind it unlock in the platform.

Growthlocked

Marketlocked

Financiallocked

Products

What S4E.io sells.

S4E CTEM & EASM PlatformAI-powered CTEM & EASM platform for website vulnerability scanning.Details ↗

In the platform

The other 440 data points.

Funding historyevery round, every lead investor
Headcount growthvelocity, departments, seniority
Open jobslive postings, hiring pace, role mix
Tech stackframeworks, clouds, security

Similar in Attack Surface

FAQ

Common questions about S4E.io.

How much funding has S4E.io raised?: S4E.io has raised $500K in total. Its most recent round was a Pre-Seed in August 2025.
How many people work at S4E.io?: About 29, down 9% over the last 30 days.
Who are S4E.io's competitors?: Hadrian, ZeroFox, and Praetorian are among the closest in Attack Surface. The full competitive set, with overlap scoring, is in the platform.