I have tried to locate this text/"Company name"? and change it, but failed to locate it.
Where do I find this text?
Can it be different text for different Apps?
How do I change the "text" just below the App name in AppStore.
The 'name' is the name used to register the developer account. Unless you submitted documents to register as a company, that will be a person's name. If you have a company/LLC and wish to change from your own name, get your documents together and contact Apple directly.
LLC:
iOS Dev Center / Enrollment - Support
If I am enrolled as an individual, can I change to a company membership?
Yes. To convert your iOS Developer Program membership from an individual to a company, please contact us. You can make this change only if you are the founder/co-founder of the company. As part of the conversion process, you may be asked to submit business documents to verify your company's identity.
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Different names require different/multiple accounts/