How transparent should an SEO company be?
Transparent enough that you always know what was done to your site, why, and what came of it. A simple test: if you cannot tell a colleague what your SEO company did last month and what changed because of it, the company is not being transparent enough. That does not mean the company owes you everything about its business. Its internal costs, staffing, and the tools it licenses can reasonably stay private. Anything about your site, your accounts, and the work you paid for cannot.
What you should be able to see
Start with the work itself. Every change made to your site, every page written or rewritten, every technical fix, and every link earned should be listed, so a monthly report tells you what was done rather than only how numbers moved. Google’s guide to hiring an SEO sets the standard plainly: “If an SEO has FTP access to your server, they should be willing to explain all the changes they are making to your site.”
You should also be able to see the deliverables. If content was written, you should be able to read it. If technical changes were made, you should be able to check them. Work that exists only as a line in a summary is not something you can verify.
The reasoning should be open too: you should be able to ask why one page was prioritized over another and get a direct answer.
So should bad news. A campaign that underperforms, a drop after a Google update, or a deadline that slips should be reported with an explanation and a plan, not left out.
What you can check without asking
Some transparency does not depend on the company at all. If your Search Console property is in your name, its Links report shows which sites link to yours, including the top linking sites. That lets you compare the links a company reports with what Search Console shows. The same applies to your analytics: if the accounts are yours, the numbers in a report can be checked against the source.
This is why account ownership is part of transparency. If analytics, Search Console, or your website accounts were set up under the company’s name, you depend on it for your own data.
What can reasonably stay private
A company can keep its pricing structure, its staff costs, its internal processes, and the commercial terms of the tools it pays for to itself. It may describe a method in general terms rather than hand over its templates. What it cannot do is keep secret what was done to your site, which sites link to you because of its work, or what your data shows. A method that cannot be described to you at all, even in plain terms, cannot be judged as safe or effective.
If a company is not transparent
Start with a direct, written request: a complete list of work done in the last reporting period, the reasoning for it, and the links built, with the sites named. Make sure the analytics, Search Console, and website accounts are in your name, with the company as a user. Then set a point to decide. If the list does not arrive, or arrives without the detail you asked for, you have learned what you need to know about the relationship, and it is better to act on it while your data is still fully in your hands.