The seller name follows the account entity, not the app name
On an organization account, the Seller line on the App Store page shows the legal entity name registered and verified on the account. It is not the app name, and it is not a team label you type into App Store Connect. So once you buy a company account, the entity users see in the store is the company behind that account. If your app serves your own customers while the page names a different company, you should know that before submission, not after launch.
Seller, developer name and copyright text are separate fields
Three items are easy to confuse. The seller name comes from the account entity. The developer name shown when users tap through is normally the same entity: a person for individual accounts, a company for organization accounts. The copyright text is something you enter yourself with each version in App Store Connect. It can name your operating company, but it is only a text statement and does not change who the seller is. Only the first two are determined by the account.
Showing your own company depends on the account's entity, not on the handover
If you want the store page to show your own company, what matters is who the account was registered as, not who logs in. If the entity is another company, getting login access and a team role will not change the seller name. Changing the entity involves Apple re-verifying organization details, and whether it is possible and what documents it needs depends on Apple's process at that time. Do not assume it can be changed. If your own company must appear, choose an account whose entity is already yours, or confirm the entity with the seller before ordering.
Aged accounts with existing apps keep showing the original entity
When you buy an account that comes with live apps, those apps are already listed under the original seller. Reviews, ratings and existing users are tied to that entity. If you plan to continue those apps, showing the original entity is the expected result. If you want your own branding instead, you need to decide whether to accept that or move the apps to an account under your own entity. App transfer has prerequisites such as agreement and app status, and the details follow Apple's current documentation.
Support URL, privacy policy and contact details should match the entity
The store page also shows a support URL, privacy policy link and marketing URL, which you provide in App Store Connect. Reviewers check that these links work and match how the app actually operates. If the seller is one company while the support email and privacy policy name another, it confuses both users and reviewers and can add back-and-forth later. Keep these pages consistent with the account entity, or state the operating relationship clearly in the privacy policy.
What to confirm with the seller before ordering
Check these points one by one: the account type is organization; the exact seller name that will appear and whether it fits your needs; whether the account includes existing apps and what their names, categories and status are; who holds the paid-apps agreement, tax and bank details and how they are handed over; who is the Account Holder and whether your side can take that role later; and whether anything in the entity details is unacceptable for public display. If the seller name does not match what you need and the entity cannot be confirmed as changeable, switch accounts instead of buying first and fixing later. Fees and procedures follow Apple's pages at the time.
FAQ
Can I show only my app brand and hide the company name on the store page?
No. The seller name is set by the account entity and appears on the page. Your brand shows through the app name and icon, which are different places.
Is it a problem if the seller name and the copyright text differ?
Not technically, since the copyright text is something you write. Just keep it truthful and consistent with your privacy policy and other pages so users are not misled.