H1B transfer concerns

[ajmer1981]

I came to the US on H1B visa, in January, 2008 through Company A.

I've had a few company changes, and i joined Company X in Feb 2010, and have been with them ever since.

 

The expiry on my visa (through company X) was set to January 2014 (Considering 6 years tenure).

 

This company X was bought by a bigger company Y in September 2012.

 

Now, they refiled my visa (for transfer) and it somehow got extended for three more years (past the 6 year duration, till October 2015). I would believe this happened as i've also filed my Green card through company Y.

 

My concerns are:

 

- Is this even possible, or could it have been an error?

- If i change my job from Company Y to any new company, would it jeopardize my H1B validity, considering it's more than 6 years?

 

I have some personal issues, and I am being forced to looking for a job outside Company Y.

 

Please advise, and thanks for your help!

 

Cheers!