H1B transfer do i need to file 539 for H4 as well having valid I-94 from previous employer ?

[shirish_sahu]

Hi,

Please provide me your advice of the following.
I am working with employer A on a H1B visa with I-797 and I-94 valid until Oct-2020. My dependents on H4 visas currently in US also had their  I-94 and stamped visa valid until Oct-2020. 

I joined employer B and they completed my H1 transfer and I have also received the approval notice. The I-797 and I-94 with employer B are valid until Nov-2020.

Do i  need to do a change of status for H4 dependents since the H4 is valid until Oct-2020 and that I can apply for change of status using I-539. In the meantime ?

Employer A has sent a notice to revoke my previous H1B with them, valid until Oct-2019.
 
1. Please let me know if I should apply for I-539 change of status for my dependents or should I not worry about it until it is due to expire in Oct-2019 .
2. Are the H4 dependents considered out of status since I changed my employer and did not apply for I-539?
3. Will Employer A revoking my H1B impact the status of my H4 dependents since they had applied for the dependents H4 visas. 

i saw some mixed response  on different forum for similar situation .
  
thank you all for your time and for all your responses in advance.
 

[JoeF]

The H4s are not tied to your employer. They are tied to your H1. So, you getting a new H1 is all that is needed.