#2 Frank Shamrock - 4 Submissions:
The last person that you could possibly want to face inside the Octagon at any point in time, is Frank Shamrock. One of the most dangerous men to ever enter the Octagon, he is also the second person on this list to also have been a massive part of the WWE product during the Attitude Era.
With an incredibly varied move set, Shamrock was someone everyone thought twice about facing back in the day, as almost each of the submission wins in title fights came in different ways, with one armbar, one kneebar, and two submissions via punches. His wins came at UFC Japan, UFC Brazil, UFC 17, and UFC 22.
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Shamrock remains second on this list, with the only next and final fighter having had more title wins by submissions.