Companies

Siegel+Gale is a global brand strategy, design, and experience firm renowned for its 'Simple is Smart' philosophy, helping major organizations clarify and amplify their brand identities.

A customer data platform (CDP) and identity resolution provider that helps brands unify and activate customer data across marketing channels.

Silverpop was a cloud-based digital marketing platform specializing in email marketing and marketing automation, acquired by IBM in 2014 and integrated into IBM Marketing Cloud.

Similarweb is a digital intelligence company that provides web analytics services, offering insights into website traffic, app usage, and market trends. It helps businesses understand their competitors, customers, and overall digital landscape. The company's platform leverages big data to deliver actionable insights for marketing, sales, and research strategies.

American book publisher founded 1924. Was a subsidiary of CBS / ViacomCBS / Paramount Global from 1975 to 2023. Sold to KKR for $1.62B; deal closed October 30, 2023. Now a KKR portfolio company.

Simon Data is a customer data platform that helps companies unify, activate, and analyze their customer data to deliver personalized experiences across all channels.

Simple Analytics provides a privacy-friendly and cookie-free website analytics solution, offering a simple and transparent alternative to traditional tracking tools. It helps businesses understand their website traffic while fully complying with GDPR and other privacy regulations, focusing on data ownership and user privacy.

Simplecast is a podcast hosting and analytics platform that provides tools for podcast creation, distribution, and monetization.

Simplestream is a video streaming technology provider specializing in live and on-demand video delivery solutions for broadcasters and media companies.

Simpli.fi is a leading programmatic advertising platform that enables advertisers to execute localized campaigns across various digital channels. It specializes in unstructured data and provides solutions for local, national, and multi-location brands to target audiences with precision with its demand-side platform (DSP).

Simply Measured was a social media analytics platform that provided brands and agencies with insights and reporting tools for social media performance measurement.

SimplyCast is a Canadian-based technology company that has established itself as a comprehensive communication platform provider, uniquely bridging the gap between marketing automation and emergency notification systems. The company's flagship platform delivers multi-channel communication capabilities across email, SMS, voice, social media, and fax channels, enabling organizations to manage both routine promotional campaigns and mission-critical emergency alerts through a single unified inter...

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...