After an IPO, what is the research quiet period during which syndicate member analysts are restricted from publishing research on the newly public company?

Why C — 25 calendar days for all syndicate members as previously required, though FINRA eliminated the mandatory quiet period in 2015, though firms may maintain internal policies

FINRA historically required a 40-day (later reduced to 25-day for managers and 10-day for other syndicate members) research quiet period after an IPO, during which syndicate analyst coverage was restricted. However, in 2015, FINRA eliminated the mandatory post-IPO research quiet period through amendments to its rules, citing the Global Research Settlement and other regulatory changes that had addressed the conflicts of interest the rule was designed to prevent. Many firms nonetheless maintain internal quiet period policies as a best practice to manage potential conflicts.