- SaaShop
- Sadetta
- Safegrid
- Safera
- Safetum
- Safety4Traffic
- Saidot
- sakea
- Salesframe
- Salusfin
- SaluStim Group Oy
- Sam Corporation
- Samuji
- Sanalysis
- Sangen
- Sannan Ruokakassi
- SansOx
- Sapotech
- Sartar Therapeutics
- SaunaOnline
- Saunayoga
- Saura
- Savroc
- ScanNanoTek
- ScanwAI
- SciAR
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- Scoopinion
- Scoopshot
- Scope Labs
- Scope Sensor
- Screenful
- Screen.io
- Scrooge
- Seaber
- Secapp
- Second Leap
- Secret Exit
- See How You Eat
- Seeinside
- Seepia Games
- Seidat
- SelectAM
- Sellai
- Sellbery
- Sellforte
- Selma Finance
- SensApex
- Sensmet
- Sensofusion
- SensorFu
- Sensotrend
- SEO AI
- Seppo
- Serious Games Finland
- Service Automatics
- Serviceform
- Setera
- Settle
- Sfonge
- SFTec
- Sharetribe
- Shark Punch
- Sharper Shape
- SharpNav
- Shipfunk
- Shipit
- Shiver Games
- Shoely
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- Showell
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- SICK Sensor Intelligence
- SIEIDI
- Sievo
- Signom
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- Silta Education
- Silverbucket
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- Siqni
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- Siru Mobile
- Sisufy
- Sitedrive
- Skand
- SkenarioLabs
- Sketchboard.io
- Skhole
- Skillpixels
- Skipperi
- Skycode
- Skyfora
- Sleipner Finland
- Smappy
- Smarp
- Smartblock
- Smartifik
- Smart Mile
- SMART PAPER
- Smidyo
- Smilee
- Smoothly
- SmoothTeam
- Snafu
- Sniffie Software
- Snowek
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- Snowhound
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- Sofica
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- Softagram
- Softa Technologies Oy Ltd
- Softpix
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- Solar Foods
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- SOLA Sense
- Soletair Power
- Solid IO
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- Solu
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- Solved
- Soma
- Some Frogs
- Sometrik
- Sonolink
- Sonolux
- Sonotecc
- Sooma
- Sopu Academy
- Sortter
- Sorvimo
- SoSe
- Soundical
- Sound Locket
- Spacent
- SparkReceipt
- Sparkwork
- Spatineo
- Spectacular AI
- SpectroCor
- Speedhire
- Spider Solutions
- SpinDrive
- Spinlet
- Spogen.ai
- SportaPost
- SportieTown
- SportIQ
- Spottio
- Sprint AI
- SprintIT Finland
- SQL Governor
- Staff Tribes
- Stafix
- Star Arcade
- Starcart
- Starstuff
- Statzon
- Stayify
- Stealth Black
- StealthCase
- Steerpath
- StemSight
- StepOne Tech
- StepOut
- Stereoscape
- Still Running
- Stonder
- StoryDrops
- Story of Roo
- Streamize
- Streamr
- Streamrun
- Strobotnik
- StyleLoving
- Stylewhile
- Subsoccer
- Sulamo
- Sulapac
- Sulava
- Sumo Apps
- Sunduka
- Sun Energia
- Suntrica
- Suokone
- Suoratyö
- Superdwell
- Super God
- Superground
- Superhood
- Supermetrics
- Supermind
- Superplus Games
- Supremacy Games
- Surgify
- Surveypal
- Suvanto Care
- SVS Innovations
- Swap.com
- Swappie
- Swarmia
- SweatPie
- SYKE Tribe
- Sympa
- Synergi
- SYRINX Bioanalytics
- SZ-TEQ
