General Discussion

Stocks drop on good earnings if the "guidance" is negative or if it is less than expected or if a competitor is coming on strong or if a sector is deteriorating or if any one of many factors outside of a particular report apply. Debt load may have increased, sales might have been artificially goosed by one big customer, or regulatory changes may presage negative financial effects or there might have been a write-off or other depressing event in the previous quarter (so only by comparison) or a company officer may have been fired for good cause or personality clash or there was (rarely) manipulation.