Shares received as a result of profits interest - when to file?

Hi there

 

In 2021 company A I had profits interests in as an employee was acquired by company B.

 

I received 75% cash and 25% stock of company B. All this was reported on a K1.

 

I paid tax on the cash portion in 2021.

 

The stock was not given to me til November 2023.

 

I have not sold the stock.

 

My questions:

1. Do I need to pay taxes in my 2023 return using the K1?

2. If not, is the taxable event when I sell the stock?

3. Will short or long term capital gains taxes be applied?

 

Thank you!