During the years ended December 31, 2022, 2021 and 2020, the Company reclassified amounts from undistributed ordinary income or accumulated realized gains (losses) to additional paid-in capital for book purposes, as follows:

As of December 31, 2022, 2021 and 2020, the components of distributable earnings on a tax basis detailed below differ from the amounts reflected in the Company’s Consolidated Statements of Assets and Liabilities by temporary book or tax differences primarily arising from the treatment of loan related yield enhancements.

The aggregate gross unrealized appreciation of the Company’s investments over cost for U.S. federal income tax purposes was $72.2 million, $121.0 million, and $166.2 million, as of December 31, 2022, 2021, and 2020, respectively. The aggregate gross unrealized depreciation of the Company’s investments under cost for U.S. federal income tax purposes was $112.0 million, $75.7 million, and $126.1 million, as of December 31, 2022, 2021, 2020, respectively. The net unrealized depreciation over cost for U.S. federal income tax purposes was $39.8 million as of December 31, 2022. The net unrealized appreciation over cost for U.S. federal income tax purposes was $45.3 million and $40.1 million as of December 31, 2021 and 2020, respectively. The aggregate cost of securities for U.S. federal income tax purposes was $3.0 billion and $2.4 billion as of December 31, 2022 and 2021, respectively.