The club, who are listed on the New York Stock Exchange, saw their share price rise to $18.10 a share, a bump from the $17.47 low on Monday as rumours emerged of Moyes' impending sacking.
The previous peak for Manchester United was in last May, when news of Ferguson's retirement sparked a stock market slump.
"The club would like to place on record its thanks for the hard work, honesty and integrity he brought to the role," Manchester United said in a brief statement,
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Ryan Giggs has been unveiled as Moyes' interim successor, as he will manage the team until the end of the season.
Moyes was confirmed as Ferguson's successor on 9 May, just a day after his predecessor announced his retirement, having managed Everton for 11 years, and he survived in the post for 11 months.
Selected personally by Ferguson to replace him, Moyes has broken several unwanted records despite inheriting a title-winning squad and spending £64.6 million on Marouane Fellaini and Juan Mata.