Comverse Technology (CMVT) says it received a second notice from the Nasdaq warning that it may be delisted from the exchange for failure to file financial reports on time.

The New York communications software shop says it is working with the Nasdaq officials to comply with guidelines.

Comverse had some stumbles recently when CEO Kobi Alexander, CFO Dave Kreinberg and company lawyer Bill Sorin resigned May 1. The next day the company announced that it got a subpoena from the U.S. attorney for the Eastern District of New York, which was opening an inquiry into possible backdating of executive stock option grants.

Comverse shares were down 18 cents during regular trading, and fell an added 9 cents to $20.02 in postclose action Friday.