Welcome to The S-Curve
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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.
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Insights and Takeaways from IMN’s 11th Annual Mortgage Servicing Rights ForumEventsAndrew Davidson & Co., Inc (AD&Co) proudly sponsored IMN’s 11th Annual Mortgage Servicing Rights (MSR) Forum by Informa at the New York Hilton Midtown. Senior modeler Daniel Swanson joined the “Managing Delinquencies & Forbearance Value” panel in discussing how servicers are adapting to today’s market and the evolving delinquency trends. Rob Landauer, Kevin Lin, and Vivian Li from our Business Development and Financial Engineering teams connected with industry leaders to exchange insights on MSR valuation, risk, hedging, and sensitivity analysis.
Below are some of the themes and takeaways gathered from conversations with attendees and from the AD&Co materials exhibited at the conference.
Rising Delinquency in Recent Vintages
Delinquency was a frequently discussed topic due to increases in delinquency rates in recent vintages. Panelists noted that tax and insurance (T&I) costs continue to increase and along with broader inflation pressures, these factors are driving higher monthly payments; panelists speculated on how much responsibility these higher payments had for the increases in delinquency.
Daniel Swanson shared several slides illustrating this trend, including:
Figure 1. 60+ Days Delinquency Percentage
Figure 2. Roll Rate from Always Current to Delinquent
AD&Co’s LoanDynamics Model (LDM) remains one of our most widely used tools for delivering prepayment and credit analytics. In addition, we recently launched our Climate Impact Suite (CIS), which incorporates climate-related costs — in the form of higher insurance premiums — into borrower behavior (prepayments and delinquencies) and home price appreciation/depreciation projections. First, property-level climate risk data provided by geospatial data vendors is translated into homeowners’ insurance premium forecasts to feed as input to CIS, which then enables users to analyze how these climate-driven payment shocks influence delinquencies, prepayments, and MSR valuations. Homes with substantial equity may see increased prepayment activity in response as cost rises, while lower-equity borrowers may be at higher risk of default.
For more details, see Eknath Belbase, “Introducing Pilot Projects for Climate Impact Suite,” The Pipeline 191 (September 2025).
MSR Valuation and Hedging in the current environment
The relative stability of interest rates over the last few years has created a welcoming environment for new opportunistic MSR investors to enter the market. The increased bid from new investors, along with stable rates, has contributed to strong MSR valuations.
However, a panelist raised an important question: Will these transitory investors remain committed if interest rate volatility increases? Some panelists also highlighted concerns about the politicalization of Federal Reserve monetary policy, with potential rate decisions influenced by political considerations rather than inflation and employment mandates. Rate and political uncertainty could put downward pressure on MSR values.
Some companies leverage MSRs as a natural hedge to their loan origination business. Some companies deploy extensive hedging with 100% of the MSR book hedged to control convexity risk. A new hedge instrument, SOFR Swap Futures from Eris, was discussed as an alternative to TBAs and other current hedge instruments because it more directly tracks SOFR risk and provides more efficient use of capital versus swaps.
AD&Co’s Mortgage Servicing Rights Kinetics (MSRK) platform allows users to value servicing assets, visualize rate-risk dynamics, and evaluate hedge strategies.
During the conference, we set up MSRK demos in our booth, highlighting:
Rate-shock sensitivities from –200 bps to +200 bps on MSRs for note rates from 4% to 7.9% (Figure 3).
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Results emphasized the importance of hedging par and premium MSRs against rising-rate scenarios.
A hedge example applying TBA swap to a 6.7% MSR (Figure 4).
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The TBA swap overlay helped flatten returns across rate paths and stabilize value.
Figure 3. Impact of Interest Rate Shocks on Different MSR Note Rate Prices

Figure 4. GSE 6.7% MSR: Interest Rate Shocks with TBA Swap
Highlighted topics:
Recapture
Recapture remained one of the most prominent themes—continuing the strong focus seen at last year’s forum. Industry participants highlight recapture as a critical component of MSR valuation and bidding, as market participants are assigning up to a 20% value to this factor. AI and related marketing efforts have put customer retention/recapture at a four-year all-time high. Failure to incorporate the value of recapture in an MSR bid will likely lead to failure. Further, high WAC loans can be more valuable MSR as the refinance propensity generates recapture value.
50-year mortgages
Recently, the administration drew national attention to 50-year mortgages, framing them as a pathway for home affordability and lower monthly payments. The general consensus among conference participants was that 50-year mortgages offer little in the way of promoting home affordability as the increase in overall interest paid by borrowers over the life of the loan more than offsets the relatively modest savings in monthly Principal & Interest (P&I). There were concerns regarding the credit profile of borrowers who cannot qualify for 30-year mortgages but could qualify for 50-year terms. Such products may introduce market distortions or unintended consequences for both credit performance and mortgage securitization markets.
Conclusion
This year’s IMN MSR Forum brought together a wide cross-section of the mortgage servicing ecosystem, fostering discussions on delinquency trends, climate impacts, evolving valuation practices, new policy developments, as well as other topics such as technology, credit score, and more. AD&Co was grateful for the opportunity to participate, share our analytics, and engage with clients and partners. We look forward to continuing these conversations in the months ahead.
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The S-Curve Archives
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Thoughts
The growing prevalence of artificial intelligence in the mortgage industry is shining a new light on the human biases that have pervaded the industry since its inception. AI is meant to bring fairness and objectivity to mortgage decisions, but it can’t perform fairly if it was built on an unfair system.
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Products
The LDM v3.0.2 library adds AutoLDM to the v3.0.1 library.
Key benefits include:
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EventsWe at Andrew Davidson & Co., Inc. (AD&Co) are once again thrilled to celebrate Pride Month, especially the contributions of LGBTQ professionals in the field of finance including affordable housing policy and the GSEs. This year, in addition to celebrating, we are also paying increased attention to the challenges that LGBTQ individuals face, particularly around issues of housing. Our pride in our LGBTQ staff and community sits alongside our concern about discriminatory lending practices, including in mortgages. As of February 2021, for the first time, lesbian, gay, bisexual, transgender, queer, and questioning (LGBTQ) Americans will be protected from housing discrimination under the Fair Housing Act.
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News
For several years, AD&Co has tracked the total rate of return (TRR) performance of the GSE CAS and STACR CRT in its U.S. Mortgage High-Yield Indices. The AD&Co Mid-Tier index constitutes a broad market measure of the TRR performance of GSE CRT. The related sub-indices segregate the CRT market into 4 index Tiers by attachment point, reflective of the credit exposure of the various classes of underlying CRT ranging from B to M1.
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EventsWe at Andrew Davidson & Co., Inc. (AD&Co) stand in solidarity with the Asian community and speak out against the xenophobic ignorance that has led to increased racist attacks against Asians. We protest against these hate crimes. This is a time to celebrate the richness that we have gained from the diversity of the Asian culture. We pledge to support the heritage that is part of what makes us American.
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Events
What does it mean to be mentally healthy? The answer is different for everyone. With all the extra anxiety that many of us have experienced since 2020, whether from uncertainty about COVID-19 or from other experiences that may be new to us, it’s important to acknowledge that it’s alright to not feel alright. Fortunately, there are numerous resources that are available locally, nationally, and in some cases through your workplace or benefits package. We might start by finding out what makes us feel better.
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Products
Today marks the publication of Chris Widman's Quantitative Perspective, a comprehensive article on the newest member of our LoanDynamics suite, the Auto LoanDynamics Model. Auto LDM will be integrated into vendor systems and AD&Co tools, allowing users to perform analysis on auto loan and ABS positions.
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EventsSince 1970, April 22nd has been the annual day to appreciate our planet and recognize the importance of protecting it. But more and more, we realize that everyday needs to be Earth Day, and that we need to take better care of the place that gives us life.
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Thoughts
To seek "causes" of poverty in this way is to enter an intellectual dead end because poverty has no causes. Only prosperity has causes. – Jane Jacobs, Activist and Author
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Events
CRTcast, a new podcast series under Freddie Mac’s Home Starts Here programming, focuses on credit risk transfer (CRT) and it’s three spokes: securities, (re)insurance and mortgage insurance. Freddie Mac leadership together with CRT industry experts cover current and relevant topics.