Truth social floated on the stock market in March, and the share price has fallen from a high of $79 to under $15:

https://www.google.com/finance/quote/DJT:NASDAQ

Truth Social had been losing money and has revenues far lower than they would need to even justify this new, far lower share price. Do shareholders believe that there is some real value in the company? Or are they so invested in Donald Trump that they will buy up these shares to “own the Libs”?

Will the share price fall below $10 by the end of trading on 30th September?

If the share price falls below $10.00 according to this page (not including out-of-hours trading) this market will resolve to YES. If the final trading day of September ends without this happening, the market will resolve to NO.

Edit for clarity - If it’s trading below $10 at any point or if the daily low is shown as being below $10, this resolves to YES. It does not need to stay below $10.