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Meaning 'too big to fail' applies to hedge funds now just like investment banksLTCM wasn't making markets and it was done in by leveraged bets on Russian bonds.
The term you are looking for is systemically important financial institution (SIFI) [1]. BlackRock, with $9 trillion under management, is a SIFI. Citadel, with under $40 billion, is not.
[1] https://en.wikipedia.org/wiki/Systemically_important_financi...