Where can I find financial reports archives?

Hey,

Let's say I want a place to gather large amounts of data of companies from major exchanges, for example all the quarterly reports from several companies over the last 10 years, what is the most effective service for me to get that? (we're talking about 100s of PDFs)

I know it's available over each companies website but a lot of times things are missing or that it's take a lot of manual work for me to download it all.

If there's a service that provides that or provides an API it'll be fantastic!

Thanks!