Excluding one-time items, Boyd actually earned 9 cents a share, a penny shy of analysts' estimates.
Revenue slipped 6.6% to $398.2 million from $426.5 million last year.
Privately-held Harrah's Entertainment swung to a third-quarter loss of more than $1 billion and recorded a $1.33 billion drop in the value of its assets.
Harrah's is the largest casino operator in the world by revenue.Wynn plunged 11% to close at $56.13 and Boyd plummeted 17.8% to $8.78. The results are also sending shares down in the rest of the sector, as Las Vegas Sands (LVS - Get Report) lost 10.9% to end the day at $14.31, Isle of Capri (ISLE - Get Report) declined 5.6% to $8.88 and MGM Mirage (MGM - Get Report) tanked 12.5% to $9.63. Las Vegas Sands is set to report its quarterly results on Oct. 29. -- Reported by Jeanine Poggi in New York Follow TheStreet.com on Twitter and become a fan on Facebook.