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Are you talking about in Salesforce, or in Marketo ABM, or both?
In Salesforce, your Sales Ops team needs to set up triggers and routing. It likely involves accounts having a field for company URL, and any lead with that URL in their email domain gets matched to that account. There are also SFDC add-ons that do this also with lead cleansing, fuzzy matching, and more (Openprise, LeanData, and a whole bunch others).
In Marketo's ABM solution, there's no way to automate this. Orphan leads show up as "potential people" and you have to add them manually. It's a huge PITA. I have a recurring to-do every month where I go through and manually review the "potential people." We're about to expand our ABM 10x and I'm really dreading this.