- Saavu
- Safelylocked
- Safetum
- sakea
- Salaxy
- SalesFollow
- Salusfin
- Sampo Software
- Samuji
- Sangen
- Sannan Ruokakassi
- SansOx
- Sapotech
- Sarastus
- Sarokal
- Sartar Therapeutics
- SaunaOnline
- Saunayoga
- Savalanche
- Savroc
- Sayduck
- Scarlet Motors
- SCIKEY
- SCOOL
- Scoopify
- Scoopinion
- Scoopshot
- Scope Sensor
- Screenful
- Screen.io
- Scrooge
- SDR Dynamics
- Secapp
- Seepia Games
- Seidat
- Selko Technologies
- Sellbery
- Sellforte
- Selma Finance
- SelQee
- Sensible4
- Sensotrend
- SenzoLive
- Seppo
- Serious Games Finland
- Seriously
- Service-Flow
- Serviceform
- Sessio
- Settle
- Sfonge
- SFTec
- Shareit.Global
- Sharetribe
- Shark Punch
- Sharper Shape
- Shipfunk
- Shipit
- Shipyard Games
- Shiver Games
- Shoop
- ShopBaloo
- Showell
- Shuut
- Sibesonke
- Sidos
- Significo
- Signom
- Sijaiset.fi
- Silo.AI
- Silverbucket
- Silvergreen
- Silvermile
- Silverskin
- SimAnalytics
- Simlab IT
- Singa
- SingOn
- SIR Analytics
- Siru Mobile
- Sitebot
- Sked
- SkenarioLabs
- Sketchboard.io
- Skhole
- Skiiot
- Skillfied
- Skillpixels
- Skilltize
- SkillzzUp
- Skipperi
- SleepCircle
- Sleipner Finland
- Smarp
- Smartblock
- Smartcart
- Smartifik
- Smartly.io
- Smart Mile
- Smartwatcher
- Smidyo
- Smilee
- Smoothly
- SmoothTeam
- Snafu
- Sniffie Software
- Sniper Analytics
- Snowek
- Social Party
- Sofica
- Sofi Filtration
- Softagram
- Soilfood
- Soil Scout
- Solar Foods
- Solar Water Solutions
- SOLA Sense
- Soletair Power
- Soljuva
- Solnet Green Energy
- Solved - The Cleantech Company
- Soma
- Sometrik
- Sonolux
- Sonotecc
- Sooma
- Sopimustieto
- Sortter
- Sorvimo
- Soundical
- SoundShade
- Soveo
- Spark Sustainability
- Sparkwork Software
- Spatineo
- Speedhire
- Spektikor
- Spent
- Spider Solutions
- SpineGym
- Spinfy
- Spinnova
- Sportacam
- SportaPost
- Sportbic
- SportConnect
- SportieTown
- SportSetter
- SPOT-A-SHOP
- Spot Digger
- SQL Governor
- Squarecone Games
- Star Arcade
- Staryhome
- Statzon
- StealthCase
- Steerpath
- Stolen Shoes Entertainment
- Stonder
- Story of Roo
- Stramos
- Streamr
- Striim.in
- StyleLoving
- Stylewhile
- Success Shopping Finland Oy
- Sulamo
- Sulapac
- Sulava
- Sumoware
- Sumpli
- Sunduka
- Sun Energia
- Suokone
- Suoratyö
- Superest Oy
- Supermetrics
- Supermind
- Superplus Games
- Surgify
- Surrogate Games
- SVS Innovations
- SweatPie
- Sweetspotter
- SYKE Tribe / Healthfactory Oy
- SYNOSTE
- SZ-TEQ