Vanguard celebrated its 35th birthday last week. To mark the firm's May 1 founding, crew members ditched their suits in favor of company T-shirts on Friday, according to a Vanguard spokesperson.

All crew members also received a commemorative poster with everybody's last names and their year of hire. Yes, that's 13,000 names.

Vanguard CEO Bill McNabb gave a speech to senior management and sent out a note to the crew on the company Intranet. 

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