Our Company

We support the U.S. housing market and global financial markets. Through our comprehensive, innovative, and market-leading platform, we bring the power of data, transparency, and speed to financial markets.

About CSS

CSS built and operates the mortgage securitization, supporting the Uniform Mortgage-Backed Security (UMBS) of Fannie Mae and Freddie Mac.

CSS provides single-family issuance, bond administration, disclosure, and tax services. We support a broad portfolio of products for our clients with full lifecycle management.

Our market-leading, cloud-based, end-to-end platform executes transactions on an extraordinary scale which has bolstered liquidity in the secondary mortgage market, one of the largest and most important financial markets in the world. Our unique approach to securitization combines the best minds in financial services with the know-how, flexibility, and innovation of leading technologists.

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Why We Started

CSS is a joint venture of Fannie Mae and Freddie Mac. Created to provide out-of-the-box thinking and innovation to the secondary mortgage market, our team was tasked with building a state-of-the-art securitization platform that would forever change the way the mortgage industry operates in the United States.

What We’ve Done

CSS has enabled investors to access $6 trillion worth of mortgage-backed securities by removing points of friction from traditional business processes.


Where We Are Going

Our technology was carefully and thoughtfully constructed to be flexible, to change and adapt to shifting market conditions and client demands. Backed by powerful technology, and a team experienced in creating meaningful client partnerships, we are focused on delivering long-term stability and transparency for the U.S. housing finance market.
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Our Mission

We are committed to providing innovative and forward-thinking solutions for our clients and creating a work environment and culture that promotes collaboration, constant learning, and flexible and Agile processes.

Our Leaders

Our Leadership

Our diverse executive team sets the tone and culture for our company
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Our Board

CSS’s Board of Managers is comprised of a Board Chair and representatives from Fannie Mae and Freddie Mac
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Our Awards

HousingWire 2020 Tech Mortgage 100 List
HousingWire 2021 Tech Mortgage 100 List
HousingWire 2022 Tech Mortgage 100 List

The Tech100 Mortgage Award recognizes the companies and solutions that are revolutionizing the mortgage process – from origination to closing, and servicing to secondary markets