HDOGTX: Can you check into ASYTQ, to see if it fits your criteria for your 3 Stages.
Yes******* Stage 2: would be filing a 15-12g (Still very weak, might be nothing more than someone who couldn't afford their auditor anymore, unless coupled with a name change).
Yes******* Stage 3: would be a change in officers and company address (This one is a decent place to real radar this one, maybe nibble a bit). What you want to see is the new officers have a decent track record on past business deals especially if they did a successful merger in the past.
Yes******* Stage 4: would be a name change (I split this stage into two lists. One's I can not find any info on new company. These I watch but don't buy. A real company who is already doing a lot of business should be al over google. The good one's are the one's where new company name is all over google, appears to have decent revenue.