Research QuestionAsset-backed securities (ABS) allow banks to pool illiquid loans and sell them as marketable assets to investors. Contrary to the general opinion, securitized loan portfolios may change their composition after being separated from banks' balance sheets. For ABS backed by small-and medium-sized enterprise loans in particular, the reason is that the time to maturity of ABS is usually much longer than that of the underlying loans. Thus, banks need to reinvest the released capital arising from the borrowers' repayments and transfer further loans to the securitized loan portfolios after the transactions' closing. This is known as portfolio replenishment. The purpose of this paper is to reveal whether banks select loans of lower quality for portfolio replenishment than for initial securitization.
ContributionWe rely on a comprehensive and very granular data set from the only central loan-level repository for ABS in Europe collected on behalf of the European Central Bank. This novel data set enables us to explore portfolio replenishment for the first time in the academic literature. Understanding banks' portfolio replenishment behavior is especially relevant because banks have a particularly wide scope of action after the transactions' closing: investors have already made their investment decision and credit rating agencies have assigned their security ratings, both resulting in less strict monitoring.
ResultsFirst, we show that loans added to ABS portfolios after the transactions' closing perform worse than loans that are part of the initial portfolios. Second, we reveal that banks induce these performance differences since they seem to exploit their information advantage by deliberately adding low-quality loans. Third, this adverse behavior is mitigated if banks do not only securitize once and thus aim to build a good reputation as well as if transparency in the ABS market is increased. These findings provide guidance for policymakers on how securitization markets could be made more sustainable in the future.
Nichttechnische ZusammenfassungFragestellung Asset-Backed Securities (ABS) ermöglichen es Banken, illiquide Kredite zu bündeln und sie als marktfähige Wertpapiere an Investoren zu verkaufen. Entgegen der allgemeinen Auffassung kann sich die Zusammensetzung der verbrieften Kreditportfolios während der Laufzeit der Wertpapiere ändern. Insbesondere bei ABS, die mit Krediten an kleine und mittlere Unternehmen besichert sind, ist dies darauf zurückzuführen, dass die Laufzeit der ABS in der Regel deutlich länger ist als die der zugrundeliegenden Kredite. Dementsprechend müssen Banken das freigesetzte Kapital aus den Rückzahlungen der Kreditnehmer reinvestieren und weitere Kredite in die verbrieften Portfolios nach Transaktionsbeginn übertragen. Dies wird als Wiederauffüllung der Portfolios bezeichnet. Ziel dieses Beitrags ist es herauszufinden, ob Banken für die Portfolioauffüllung Kredite von geringerer Qualität auswählen als bei der initialen Verbriefung.
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