Do automatic 401k contributions affect markets?

Every two weeks, about 60 million Americans have an automatic buy in their 401k accounts.

This is split up into bi-weekly, semi-monthly, and perhaps weekly, but you would expect most of these buy orders happen on a Friday.

Does this move the market at all? Is there a benefit to buying on Thursday for the Friday 401k bump?

I would imagine VOO or SPY is the biggest benefit of this. Are these funds simply too big for the paycheck bump to move the needle?