Sphere Entertainment, the operator of the newly opened landmark Las Vegas arena as well as the MSG regional sports network, led all sports stocks in March, gaining more than 20% in the month as CEO Jim Dolan more than doubled his personal stock ownership the past five weeks.

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Sphere was the month’s best performer of the Sportico Sports Stock Index, which tracks the state of the sports business as reflected in 40 U.S.-listed team, media, gear and gambling stocks. The index edged one point higher in March, closing at 1,169. That puts the index up a tad more than 1% for the year, and nearly 12% higher from its debut in 2020.