The S-Curve

Welcome to The S-Curve

Now you will be able to receive the latest announcements, product updates, and our insights on the mortgage market in real time.

The name of the blog, the S-Curve, is a reflection of our logo and the central feature of our prepayment model. S-curves are seen in nature in many phenomenon, from population growth to prepayment and default models. Our first S-curve, in the early 1990s, used the arctangent function, then piece-wise linear functions, and evolved over time to be more complex and vary by FICO, loan size and LTV. This evolution encapsulates both the timeless nature of fundamental relationships and constant innovation to describe them better over time.

We hope you find the information useful and we look forward to your feedback.

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Blog - Latest
  • The Power of Mentoring

    Adam Marchuck

    Thoughts

    January is National Mentoring Month which is very appropriate since it coincides with the time when we typically set out our goals and intentions for the New Year. Organizations are embracing mentoring programs and these programs have indeed become a strategic imperative for many. There are many benefits to mentorship and it's easy enough to comprehend. The individuals involved in a mentoring relationship and the organizations that choose to sponsor a mentoring program all are likely to benefit.

    For the organization, mentoring can build and strengthen the talent pipeline; help build loyalty among emerging talent; set up or help identify the next generation of talent; and build strategic alignment across silos of an organization by informally encouraging knowledge sharing across different areas. Mentoring programs have proven to be an effective tool to retain and effectively onboard talent, decrease the learning curve for critical roles, build a leadership pipeline, increase employee engagement and build networking and sponsorship. Additionally, mentorship is more frequently being used as a thoughtful tool to promote diversity, equity and inclusion by ensuring that all talent within an organization is provided with opportunities to learn from what the organization may consider to be the 'best and brightest' or simply by those who 'have been there and done that' before. Mentorship promotes diversity of thought and experience to be shared, which we are universally understanding, and recognizing is a benefit to any organization.

    For the individuals in a mentorship relationship whether or not they are a part of a formal program, there is unlimited opportunity for learning, growth and development. A mentee has the benefit of getting perspective from someone who can be encouraging but also provide critical and frank feedback when needed and be instrumental in helping a mentee to increase their resiliency in the face of challenges. Mentors can help a mentee to navigate specific situations or people as well as provide sage advice on navigating a career. Solid mentorships can flourish and last for months or years.

    Mentorship programs help to connect or match individuals and provide a framework that encourages confidential dialogue on a regular and consistent basis. For organizations -launching, executing and coordinating a mentorship program may seem like a daunting task but it does not need to be. Mentorship comes in all shapes and sizes - the key is to get started. Any company or association should consider providing tools and encouragement for mentorship opportunities both inside and outside of its organization as a simple way to demonstrate that they wish to invest and focus on talent. Talented employees are often looking for opportunities for personal and professional growth just as much as they are seeking promotions and compensation increases. It is important that team members believe they have access to impactful development opportunities to hone their skills and grow into their full potential. Mentorship programs demonstrate a commitment to the employee to develop in the manner they want with goals they establish.

    If there is an existing program at your organization, see how you can get involved. If there is no formal mentoring program at your organization then consider helping to build one. In any case, no matter where you are in your personal or professional journey, look for a mentor. And for those of us who are senior leaders look for one or more mentees. I took much pride and enjoyment in starting up a mentorship program at my former company which had hundreds of employees from around the world participate through several "waves" of the program. In addition to opportunities within your company - there are many organizations that seek mentees to volunteer their time. American Corporate Partners (ACP) is a great one that I have had the pleasure of being a part of which helps our veterans, and their spouses prepare for professional opportunities outside of the military. GROW MENTORING is another that I have been a part of which began during COVID-19 by a young lawyer in the UK who simply wished to encourage junior lawyers and law students to connect with more experienced professionals during an otherwise isolated time. University alumni associations, professional organizations such as TechGC and many other groups have mentorship opportunities to get involved in and are always looking for volunteers.

    And keep in mind that in a mentoring relationship it's not only the mentee that benefits! Mentorship builds a two-way, mutually beneficial relationship. What mentors learn and take away from mentoring their junior mentees is often priceless and may be the biggest surprise in any mentorship relationship. A good mentor should be an active and open listener. As an active listener a mentor can learn new insights, new values, and tools from their mentee including strengthening their coaching and feedback skills and make important often long-lasting relationships.

    Ask most leaders if they have had one or more mentors during their career journey and the answer will undoubtedly be a resounding 'yes'. At a low cost with opportunity for high impact, it is no surprise that mentorship programs are becoming more and more popular, and more and more employees are getting involved. As you set your goals for 2023, I encourage you to seek out opportunities to be a mentor or mentee for yourself and for others.

    Happy National Mentoring Month!

Blog - Archives

The S-Curve Archives

  • Mickey Storms, Alex Levin

    Thoughts

    Recently, aggregators have crossed market borders by issuing residential mortgage-backed securities (RMBS) backed by owner-occupied (OO), GSE-eligible conforming loans. Additionally, conforming mortgage loans have drawn investment interest from insurance companies fronted by aggregators and evaluated by third-party firms. These developments constitute historically rare disintermediations of the nearly monopsonist purchases of conforming loans by the GSEs.

  • Rob Landauer, Abe Martin

    Podcast

    Join Rob Landauer in a conversation with Abe Martin as they discuss his recent Pipeline article, "Modeling the Balance Behavior of HELOC Borrowers." In this episode, they highlight key points from the article as he shares insights into the draw component of HELOCs and provide an update on the beta rele

  • Ashlea Bonds

    News

    We’re excited to announce a major addition to the Andrew Davidson & Co., Inc. (AD&Co) team. Industry leaders Kelli Sayres and Gene Park, known for building and scaling leading fixed-income analytics platforms, have joined AD&Co’s Business Development team.

  • Sanjeeban Chatterjee, Vivian Li, Joni Baker, Richard Cooperstein

    Thoughts

    Building on our earlier research on expanded consumer attributes, AD&Co continues to explore how credit data contributes to modeling delinquency and prepayment risk, which are key drivers of mortgage servicing rights cash flows and valuation.

  • Joann Gollette

    Events

    Andrew Davidson recently joined NFM Lending’s Greg Sher on the One On One podcast to discuss our recent white paper, “The Impact of Moving Away From the Tri-Merge Standard.”

  • Eknath Belbase, Daniel Swanson, Yvonne Chen

    Events

    AD&Co recently sponsored and attended SFVegas 2026 and Optimal Blue Summit 2026. This post shares the AD&Co team's unique perspectives and key takeaways from attending both conferences.

  • Alex Levin

    News

    AD&Co US Mortgage High Yield Indices

    The Federal Reserve Economic Data (FRED) portal, housed by the Federal Reserve Bank of St. Louis, has been publishing AD&Co’s CRT indices since 2019. These series posted under the overall name of “US Mortgage High-Yield” include total return rates and credit and option-adjusted spreads (crOAS) – a projected return’s spread over Treasury (in the past, Libor). These series are available going back to 2014-end and tiered by CRT initial supports.

  • Joni Baker, Sanjeeban Chatterjee, Richard Cooperstein, Andrew Davidson

    Thoughts

    In July 2025, the US Federal Housing Finance Agency (FHFA) announced that the government-sponsored entities (the Enterprises or GSEs), Fannie Mae and Freddie Mac, would permit lenders to choose between Classic FICO and VantageScore 4.0 credit score models for loans sold to the GSEs. FHFA also stated in a social media post that the tri-merge standard would be maintained for mortgage underwriting. Nevertheless, some mortgage industry stakeholders recommend moving away from the tri-merge standard for GSE mortgages in favor of a single or bi-merge report standard.

  • Joann Gollette

    News

    As housing faces more climate threats that result in more losses, the insurance program that it sits on is teetering on the brink of collapse. Yet, the home insurance market has three distinct stakeholders that have competing priorities, and today, there is no motivation for a collaborative solution.

    Understanding how to strengthen and protect the current structure requires looking at the cost burdens along with the risk for each of those parties.

  • Sanjeeban Chatterjee

    Thoughts

    There has been a flurry of activity in the mortgage markets since the 2018 passage of the Economic Growth, Regulatory Relief, and Consumer Protection Act. This act requires the Federal Housing Finance Agency (FHFA, now known as US Federal Housing) to validate and modernize the credit score models used in the housing finance system. It should be noted that so far, the discourse has been around mortgages sold to the Enterprises (Fannie Mae and Freddie Mac). Ginnie Mae has not provided any guidance on their plans to start using new credit score models.