Criteria for delisting on Nasdaq,
the delisting process is set in motion when a company trades for 30 consecutive business days below the minimum bid price or market cap.
At this point, Nasdaq's Listing Qualifications Department will send a deficiency notice to the company, informing it that it has 90 calendar days to get up to standard in the case of the market value listing requirement or 180 calendar days if the issue is regarding the minimum bid price listing requirement.
The minimum bid price requirement, which is $4, and the market value requirement (minimum $8 million, provided other requirements are met) are the most common standards that companies fail to maintain. Exchanges typically provide relatively little leeway with their standards because most healthy, credible public companies should be able to meet such requirements on an ongoing basis.
However, while the rules are generally considered to be written in stone, they can be overlooked for a short period of time if the exchange deems it necessary.