50 Best Spam Filtering Companies to Watch in 2026

The most prominent spam filtering companies ranked by global prominence, funding activity, and market position.

30
Total Companies
$151.7M
Total Funding
$5.1M
Avg Funding
San Francisco
Top Location
# Company Location Employees Total Funding Last Round Last Funded
1
IPXO
IP Management / Abuse Management / DNS Management / Delegated RPKI / IP Reputati…
London 51 - 100 $2.5M Undisclosed 2025-10-20
2
Respondology
Respondology develops a customizable comment moderation tool for businesses or a…
Boulder 11 - 50 $16.0M Series A 2025-04-23
3
Two Hat Security
Two Hat is the world's leading AI-powered content moderation platform for organi…
Kelowna 51 - 100 $9.9M Series A 2019-11-12
4
Arkose Labs
Arkose Labs protects enterprises from cybercrime and abuse.
San Mateo 101 - 250 $106.5M Series C 2021-05-11
5
Smart Moderation
Smart Moderation is an AI solution that keeps the online world clean and free fr…
San Francisco 1 - 10 $240K Seed 2016-09-01
6
Smyte
Smyte stops bad actors on marketplaces and social networks.
San Francisco 11 - 50 $6.2M Series A 2017-03-28
7
SF Filter AG
SF Filter AG distributes mobile and industrial filters used for oil, air, fuel, …
Bachenbulach, Switzerland 101 - 250 Private Equity 2016-01-01
8
Keypic
Keypic is a cyber security and authentication tool combats web-spam without CAPT…
Walnut, United States 11 - 50 Seed 2013-10-25
9
IID
IID's ActiveTrust accelerates big collaboration for actionable security intellig…
Tacoma 51 - 100 $8.0M Series A 2013-11-05
10
ClearMyMail
ClearMyMail provides online spam filtration services to protect emails from spam…
Corby 1 - 10 $150K Angel 2007-12-01