Oversubscribed

[Jessica]

If something is oversubscribed, people still want to buy things, especially shares or tickets, although all of them are already sold:

[Dorothey Allen]

if a share issue (= occasion on which new shares are sold) is oversubscribed, people want to buy more shares than are available:

[Tanya Shivari]

Applied for in greater quantities than are available or expected.

[Vitius Petroff]

thanks