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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ThoughtsRecently, 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.
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PodcastJoin 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
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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.
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ThoughtsBuilding 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.
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EventsAndrew 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.”
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EventsAD&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.
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NewsAD&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.
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ThoughtsIn 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.
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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.
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ThoughtsThere 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.