SAN Jose, Calif. ( TheStreet) -- SunPower ( SPWRA) filed with the Securities and Exchange Commission on Friday to delay its fourth quarter and annual report filing until March 19. SunPower has been in the midst of an internal accounting investigation since mid-November. SunPower typically reports earlier in the earnings season -- at this point, SunPower would be considered a de facto Chinese solar company based on its filing date so late in the earnings calendar. The delay in reporting fourth-quarter earnings may give some investors pause. However, the delay in reporting fourth-quarter earnings and filing its annual 10-K with the SEC can't be read as a sign that the accounting investigation has uncovered more substantial errors than SunPower has previously alluded to. Corporate lawyers and auditors often err on the side of prudence during accounting investigations and take every delay available to them before reporting. Some companies even extend their investigations as far out as they can until they would literally face de-listing by an exchange. Therefore, the SunPower delay was expected by many analysts who cover SunPower once the solar company did not report on its usual time frame. SunPower shares were close to flat on Friday, while the solar sector and technology rallied to a greater extent. The SEC filing says SunPower expects to file the annual 10-K on or before March 19. It would seem reasonable to conclude that since SunPower has already delayed its filing, it will in fact wait until March 19 to report.