Its stock has returned more than 2,700 percent since it went public in 1992.
Many new issues enjoy several months of strong performance before the euphoria dies down and the stocks return to earth with a thud.
The stock has returned 227% in the past year.
Its stock, which fell 68 cents, to $17.64 in regular trading, initially rose after hours, but then returned to the level of the market close.
Moreover, about half the stocks that are in it have returned less than a money market fund this year.
Over 50 five-year periods since 1929, some of which overlap each other in part, stocks returned 7.2 percent after inflation.
It's not that stocks have not really returned an average 10.7 percent a year for much of the last century.
The company's stock did not return to its initial offering price until 1997.
The rolling stock returned when the extension opened in 1920.
The stock rose on the news, but then returned to its previous, lower level.