Companies

Sincera is an ad inventory + supply-quality analytics company acquired by The Trade Desk in January 2025 (~$25-30M, terms undisclosed). Provides programmatic ad inventory metadata, transparency reports, and supply-quality scoring. Powers TTD's OpenSincera open-data initiative post-acquisition.

Singular is a leading marketing intelligence platform that specializes in unifying mobile attribution and marketing analytics for data-driven marketers. The company addresses one of the most critical challenges in modern digital marketing: understanding and measuring the complete customer journey across multiple channels and touchpoints. By consolidating marketing data from diverse sources into a single platform, Singular enables organizations to gain actionable insights, optimize their marke...

German digital experience agency acquired 2017. Major Hamburg-based digital practice. Brand retired in 2022 Song rebrand. Sources: The Drum + Campaign Asia rebrand coverage.

Sirdata is a European data marketing company specializing in cookieless audience targeting and contextual advertising solutions. The platform provides semantic analysis, audience segmentation, and privacy-compliant data activation for advertisers and publishers across Europe.

SiriusXM Media is the advertising sales division of SiriusXM, offering audio advertising solutions across satellite radio, streaming platforms, and podcasts.

Sisense is a business intelligence (BI) and analytics software company that provides a platform for data preparation, analysis, and visualization. Its platform enables organizations to embed analytics directly into their products and workflows, empowering users to make data-driven decisions and uncover actionable insights.

SISTRIX is a German SEO software platform providing comprehensive toolbox solutions for search engine optimization, visibility analysis, and competitive intelligence.

Sisu Data is an augmented analytics platform that helps organizations quickly understand *why* their key business metrics are changing. It leverages machine learning to automatically analyze vast amounts of data, identifying the root causes of performance shifts and enabling faster, more confident data-driven decisions.

Sitebulb is a specialized software company that develops advanced website auditing solutions designed specifically for SEO professionals, digital marketing agencies, and web development teams. The company's flagship desktop application distinguishes itself from traditional browser-based crawling tools through its desktop-native architecture, which enables deeper technical SEO analysis across critical areas including site architecture, crawlability, indexability, mobile optimization, page spee...

Sitecore is a leading digital experience platform that enables organizations to create and deliver personalized, content-rich digital experiences across multiple channels. It provides a comprehensive suite of tools for content management, marketing automation, and customer data management.

Sitefinity is a .NET-based digital experience platform (DXP) and content management system owned by Progress Software, enabling organizations to create and manage personalized web experiences.

Siteimprove is a global software company that provides a comprehensive platform for optimizing and managing digital presence. Its solutions help organizations improve website accessibility, SEO, content quality, analytics, and data privacy, ensuring a better user experience and compliance.

Siteliner is a specialized web-based tool designed to help website owners, SEO professionals, and content managers identify and resolve duplicate content issues across their websites. The platform crawls websites to detect identical or similar content across multiple pages, broken links, page load times, and other technical SEO factors that can impact search engine rankings and user experience. By providing detailed reports on content duplication percentages, internal linking structures, and ...

SiteScout was the first self-serve advertising platform for buying online banner ad space in real-time, pioneering programmatic display advertising.

SiteSpect provides a digital experience optimization platform that enables businesses to test, target, and personalize their websites and mobile apps. It offers A/B testing, multivariate testing, and personalization capabilities to improve user experience and conversion rates without requiring code changes.

Sizmek was a leading independent ad serving and programmatic advertising platform that powered campaigns across display, video, mobile, and social channels before filing for bankruptcy in 2019.

Skai (formerly Kenshoo) is a leading marketing technology platform that empowers brands and agencies to manage, measure, and optimize their advertising and marketing campaigns across a wide range of digital channels. Leveraging AI and data-driven insights, Skai provides solutions for paid search, social media, retail media, and app marketing, helping clients maximize their return on ad spend and achieve their business objectives.

Strategic comms + Democratic political consulting (formerly SKDKnickerbocker). Offices DC, NYC, LA. Acquired by Stagwell Group 2015.

Sketch is a leading vector-based design platform that has established itself as a premier tool for digital product design, particularly in the UI/UX space. Founded in the Netherlands, Sketch revolutionized the design industry by offering a Mac-native application specifically tailored for interface design, moving away from traditional graphic design tools that were not optimized for digital product workflows. The platform provides designers with an intuitive, streamlined interface combined wit...

Sketchfab is a 3D model publishing and sharing platform that enables creators to upload, view, and distribute interactive 3D content directly in web browsers.

Skimlinks is a commerce content monetization platform that automatically affiliates product links for publishers and content creators.

Digital wallet and online payment platform enabling international money transfers, online payments, and prepaid card services for consumers and businesses.