The Agency residential MBS market is over $8.3tn in February 2022 and is the second most liquid fixed income market after Treasuries.
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The market shares of the three agencies are:
1. Fannie Mae 3.5tn, ($1.060B in Fed Portfolio, $2,120B in Pools, $270Bin CMOs)
2. Freddie Mac 2.7tn ($840B in Fed Portfolio, $1,630B in Pools, $270B in CMOs)
3. Ginnie Mae 2.0tn ($560B in Fed Portfolio, $1,090B in Pools, $330B in CMOs)

In a recent note, we pointed out how a measure of the success of the Unified Mortgage Backed Securities (UMBS) project was the narrowing in the CMO Lockup Rate between Freddie Mac and Fannie Mae[1]. For many years, Fannie Mae benefitted from the liquidity advantage its security maintained compared to that of Freddie Mac, based on its long-standing market leadership position. To compensate, Freddie Mac locked up more of its securities in CMO’s, in an effort to create a supply-constrained premium in its own securities. The degree of success achieved using this strategy could be measured in terms of changes in the “Traditional Share”.

“Traditional Share” is a terminology widely used within Fannie and Freddie, that measures the market share held by Fannie Mae compared to its smaller rival. For example, the Traditional Share of 60, means loans guaranteed by Fannie Mae contribute to 60% of the GSE book, while those guaranteed by Freddie Mac contribute 40%. For the purposes of this note we will measure this in terms of loan count for purchase mortgages only.

In 2014, FHFA announced the establishment of a new securitization infrastructure[2] for all mortgage loans backed by single family residences into a new common security. Historically, the Traditional Share had stood at about 60%, but at that time it had risen to over 70%, putting Freddie Mac into a dire situation. With that announcement, the share started to decline, and by the time the UMBS was launched in 2019 the share had eased back towards the 60% level. As a result, Freddie Mac faced reduced pressure to lock its securities up in CMOs, and the gap between this activity and that of Fannie Mae was about halved over the 2014-2019 time frame. 

Subsequently, the question was whether investors would maintain an indifferent posture between the delivery of Fannie Mae and Freddie Mac UMBS. Lingering fears about the possibility of so-called specified trades faded along with narrowing performance differences between the two agencies, and in recent months the Lockup Gap has almost disappeared. This was recently met with a significant plunge of 8.6% in the Traditional Share in Q3 2021 to a record-low 47.4%.

As we mentioned in our previous blogs, Recursion’s proprietary tools Cohort Analyzer, and Pool Level Analyzer can analyze FED and CMO portfolios recursively down to the “simple pool” level. There are a wide range of applications of these powerful tools. We previously demonstrated how to calculate FED portfolio and CMO lockup rates at the macro level. Another important application is to study the collateral of mortgage bonds directly at the loan level in order to support investor’s trading decisions.
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Before we delve into this particular CMO bond, we want to discuss the loan leverage coverage ratio for all agency pools. As we know, Fannie Mae discloses loan level information for all pools issued in and after 2013, and Freddie Mac does this for pools issued in and after 2006, while Ginnie Mae disclosures include loan level information for all pools that are not paid off. When Recursion was founded in 2015, due to its short disclosure history, Fannie Mae pools’ loan level coverage was fairly low. However, as of today, Fannie Mae’s loan level coverage has improved to close to 90%.  As time goes on and pools issued before 2013 gradually pay off, the loan level coverage of outstanding agencies pools will reach 100% as will the CMO loan level coverage.

In a recent post[1], we discussed using Recursion’s proprietary tools to unravel the Federal Reserve’s MBS holdings of Fannie Mae and Freddie Mac loans. The Fed’s holdings, however, are part of a bigger picture issue regarding the notion of “float” in the MBS market, that is, the amount of securities outstanding that are available to trade. The holdings of the central bank serve to reduce the float as the Fed is a buy-and-hold investor. These loans are said to be “locked up”. Besides the Fed, loans can be locked up in structured products, notably Collateralized Mortgage Obligations (CMOs). The first CMOs were launched by Freddie Mac as Real Estate Mortgage Investment Conduits (REMICs) in 1988 and allow cash flows to be tranched to meet the needs of different investors[2]. Pools in CMOs’ collateral groups are also locked up.

In a recent paper, researchers at the Philadelphia Fed (Liu, Song and Vickery, May 2021) discussed the history of the differential between the pricing and the trading volume differential between Fannie Mae and Freddie Mac securities[3]. Historically, Fannie Mae securities had traded ten times as often as those of Freddie Mac, with the consequence that trading costs for Freddie Mac could be twice those of Fannie Mae. In this paper they comment that Freddie Mac compensated for this by raising its g-fee, and by locking up its securities in CMOs.
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Using the same recursive algorithms as in our prior blog, we can back out the CMO lockup, FED lockup and Float by agency: