With the help of Ahrefs' Link Intersect tool, you can easily find sites that link to your competitors (or their pages) but don't link to you (yet). 

Once you have added the respective domains/URLs(you can add up to 10), click on "Show link opportunities".

The next page shows the referring domains that link to your competitor domains but do not link to your website or the target domain set. Here you can also use the handy filter that lets you pick the number of intersecting targets:

If you click on the down arrow for any of the domains, you'll get quick links to in-depth data of the particular domain and a snapshot of its statistics. 

Click on "Export" to export the list of intersecting referring domains.

Click through on the number to view the actual backlinks originating from the intersecting referring domains. If you want to export the backlinks from the intersecting referring domains, click on "Export" to export the list of backlinks.

Do note that you will need to do the export of the set of backlinks from each intersecting domain separately.

Once prompted, select the export type and click "Start export." 

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