Do the big bulge bracket investment banks on Wall Street require external finance-related services of nearby small boutique firms?

Do the big bulge bracket investment banks like: JPMorgan, Bank of America, Citi, UBS, Goldman Sachs, Barclays, Deutsche Bank, Morgan Stanley and Credit Suisse pay for any (external) finance-related services from nearby boutique firms that the banks can't do themselves internally?

If so, can you name some examples of these types of specialized finance-services that the small boutique-firms offer that is beneficial to the big banks?

For example, the big banks might hire a lawyer from a nearby small boutique for their legal work.

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