H1B transfer possibility after I-140 withdrawn

[luck2u]

Here is my situation...

I have I-140 approved with X company and got H1B approved for 3 years by Y company using X company's I-140. Lateron I came to know that X company had withdrawn my I-140 petition. Now, if I want to transfer my H1B from Y company to Z company, is it possible even my current I-140 is withdrawn by X company?

If not, pls let me know the options to switch employer as I came to know X and Y company both are in big risk in USCIS perspective and hence I'm planning to not have my H1B with either one of them.

Thanks inadvance!!