The FCC released the results of its biggest-ever auction of millimeter wave (mmWave) spectrum last week, and Verizon, AT&T and T-Mobile were the big spenders during the event.
But they weren't the only companies that purchased spectrum.
As noted by Stephen Wilkus of Spectrum Financial Partners, here is the full list of companies and bidding entities that purchased spectrum during the FCC's auction of licenses stretching across the 37GHz, 39GHz and 47GHz bands in an event dubbed Auction 103.

(Source: Stephen Wilkus of Spectrum Financial Partners)
Companies often participate in FCC auctions under "bidding entities." For example, Verizon bid under the "Straight Path Spectrum" entity; Verizon is listed as the "contact organization" for Straight Path Spectrum in its FCC filings.
Breaking it down
While such figures are clearly useful, they don't tell the whole story. Brian Goemmer, founder of spectrum-tracking company AllNet Insights & Analytics, offers a clear look at exactly how spectrum ownership now breaks down across the bands available during Auction 103.

(Source: Brian Goemmer of AllNet Insights & Analytics)

(Source: Brian Goemmer, founder of spectrum-tracking company AllNet Insights & Analytics)
Goemmer offers additional information on mmWave license ownership across other bands on his website.
Finally, and perhaps most importantly, spectrum licenses are allocated on a geographic basis, which means that a spectrum license covering Denver cannot be used in Socorro, New Mexico. And, not surprisingly, the licenses covering Denver (with roughly 700,000 residents) are far more valuable than licenses covering Socorro (with 8,600 residents).
Thus, here are detaileds maps showing exactly how much spectrum each of the top bidders purchased, and where those licenses are geographically located, as assembled by both Wilkus of Spectrum Financial Partners and spectrum-tracking firm Moise Advisory.
Verizon

(Source: Stephen Wilkus of Spectrum Financial Partners)

(Source: Moise Advisory)
AT&T

(Source: Stephen Wilkus of Spectrum Financial Partners)

(Source: Moise Advisory)
T-Mobile

(Source: Stephen Wilkus of Spectrum Financial Partners)

(Source: Moise Advisory)
Columbia Capital

(Source: Stephen Wilkus of Spectrum Financial Partners)
Dish Network

(Source: Stephen Wilkus of Spectrum Financial Partners)
U.S. Cellular

(Source: Stephen Wilkus of Spectrum Financial Partners)
Sprint

(Source: Stephen Wilkus of Spectrum Financial Partners)
— Mike Dano, Editorial Director, 5G & Mobile Strategies, Light Reading | @mikeddano