NTIA submitted this report to Congress on October 14, 2022 pursuant to Section 207 of the Commercial Spectrum Enhancement Act (CSEA), Title II of Pub. L. 108-494. As authorized by the CSEA, the Spectrum Relocation Fund (SRF) provides a centralized and streamlined funding mechanism through which federal agencies can recover the costs associated with relocating their radio communications systems or sharing spectrum reallocated and authorized to be auctioned for commercial purposes. This report describes the progress the federal agencies have made in adhering to timelines for transition of their spectrum and also details, on a system-by-system basis, the costs estimated, funds transferred, and costs paid from the SRF. This report is based on data submitted by the federal agencies to NTIA and covers the period from January through December 2021 for the following auctions conducted by the Federal Communications Commission: Advanced Wireless Services (AWS)-1 involving federal spectrum in the 1710-1755 megahertz (MHz) band; AWS-3 involving the 1695-1710 MHz and 1755-1780 MHz bands; the 3.5 gigahertz (GHz) auction of Priority Access Licenses in the 3550-3650 MHz band; and the 3.45 GHz Service in the 3450-3550 MHz band.