Advices for internship search in commodity trading

Hi all

I'm currently searching for a 6 months internship in commodity trading.

Any advice is welcome !!

I'm thinking to send my CV and cover letter to many companies but I'm not sure which way is preferable.

These firms often don't offer internship. Often you can find this on their website: "X is always looking for experienced and motivated candidates to join our teams throughout the world; however, the opportunities available are limited"

Is it better to send my application documents to the HR or to a person with high management position I've never meet ?

Best regards

HH