At the current share price – roughly $40 a share – his holdings are worth roughly $5bn – far more than analysts say is justified by the company’s sales and operations.
The firm’s share price has been notoriously volatile, often tied to events in Mr Trump’s life – and his election odds.
Shares of its predecessor company started rallying in January, after Mr Trump defeated Republican challengers in the primaries.
The price soared further after Trump Media formally debuted on the Nasdaq stock exchange in March.
But shares slumped at the start of his criminal trial in April, in which he was later convicted of fraud charges linked to hush-money that was paid to adult-film actress Stormy Daniels.
The current share price remains below levels seen in March.
“There is no current fundamental business performance of the company that supports this current ‘price’ but buyers are likely political supporters purchasing shares to support the President’s wealth ahead of the election,” said Thomas J Hayes, chairman of Great Hill Capital.
On Saturday, images of Mr Trump holding up his fist defiantly to show he had survived the assassination attempt elicited roars from his supporting crowd.
Mr Trump later told US media he felt that he had been saved “by luck or by God”.
“The most incredible thing was that I happened to not only turn [my head] but to turn at the exact right time and in just the right amount,” he said, adding that the bullet that grazed his ear could have easily killed him.
One audience member was killed in the attack, while two other people were seriously injured. The gunman has been named as Thomas Matthew Crooks.
The motive of the shooter remains unclear.