How to Handle Domain Authority After a Company Acquisition

After an acquisition, or a merger of two companies of equal standing, one decision sits at the center of the search outcome: which domain the other should point to, if either should point anywhere. The question can get framed as “which site has the higher domain authority”. That framing hides the real inputs. The acquired site’s links, the demand for its brand name, the rankings it holds today and any problems it brings with it all move with the decision, and none of them is a single score.

“Domain authority” is not a Google number

Moz’s Domain Authority and Ahrefs’ Domain Rating are estimates that each tool vendor computes from its own link data. They are useful shorthand for “this site has a stronger or weaker link profile than that one”. They are not Google metrics, and nothing about them transfers when you redirect a domain.

What a redirect does, Google describes directly. Its documentation on redirects says a permanent redirect is used by the indexing pipeline “as a signal that the redirect target should be canonical”. The documentation gives no percentage of anything lost or kept along the way. Once the redirects are in place, links to the old URLs lead through them to the new ones, and the destination pages are the ones Google considers showing.

Look at the underlying data instead of the scores:

the referring domains of each site, and how relevant and editorial those links are;
the impressions each brand name gets, visible in each site’s Search Console queries (for the acquired site, once you have access to its property);
each site’s current rankings and organic traffic.

A domain with a high tool score built on low-quality links is weaker than its number suggests.

Four strategies

Pick the strategy from the situation, not from a default.

Full consolidation. Redirect the acquired domain into yours. It fits when the acquired brand has little search demand of its own and the two audiences and topics overlap heavily.
Keep both. Run the two domains side by side. It fits when the acquired brand has strong independent brand search, a distinct audience or product line, or a regulatory or contractual reason to stay separate. A redirect cannot rebuild demand for a name people actively search for. If both sites stay live and rank for the same terms, decide which domain owns which topics.
Partial consolidation. Move the valuable, still-relevant sections and retire the rest. It fits when only part of the acquired site earns its keep.
Reverse absorption. Redirect your site into the acquired one. It fits when the company you bought has the stronger link profile, brand recognition and rankings.

Let the data choose the direction

A costly default is redirecting the stronger domain into the weaker one because the weaker one belongs to the company that did the buying. The direction of the redirect should follow link quality, brand demand and rankings, not the org chart.

For example, imagine you acquire a company whose domain has years of editorially earned links and steady brand search, while your own domain is newer with a thinner link profile. Redirecting the acquired site into yours would point the better-linked, better-known domain at the weaker one. Either keep both, if the acquired brand’s demand is independent, or consolidate toward the domain you just bought.

Sometimes the brand decision goes the other way anyway, and that can be a legitimate business call. Make it with the link and traffic numbers on the table, so the trade is chosen, not discovered six months later in a traffic report.

Diligence: you buy the site’s history too

An acquisition buys the acquired site’s past, including its problems. Before committing to a strategy, check three things on the acquired domain:

Manual actions. Open the acquired site’s Search Console property and check the Manual Actions report. You need verified access to do this, so make access a condition of the deal. Google tells new owners what to do: if you recently bought a site that violated its spam policies before you owned it, fix the listed issues, then say in the reconsideration request that you recently acquired the site and that it no longer violates the policies. Do this before consolidating, not after.
The link profile. Google’s spam policies treat buying or selling links for ranking purposes as link spam. If a large share of the acquired site’s links come from paid placements or link networks, a redirect points all of them at your site.
The baseline. Record each site’s rankings and organic traffic before anything changes. Without that, nobody can say later what the decision gained or cost.

If you consolidate, run it as a site move

Google’s guide to site moves with URL changes covers merging multiple domains, and its rules apply directly:

Map old URLs to their closest equivalents. Google says not to redirect many old URLs to one irrelevant destination such as the new site’s home page, which can confuse users and might be treated as a soft 404.
Keep the redirects as long as possible, generally at least one year, according to the site move guide.
File a change of address. The Change of Address tool needs both properties managed by the same Google account. When moving from one domain to another, Google says to use it for all subdomain variants of the old domain, including www and non-www. The tool’s effects continue for 180 days, and Google asks that redirects stay in place for at least that long, longer if the old URLs still get traffic from Search.

In practice, you don’t need hand-made one-to-one mapping for every URL on a large site. You need it for the pages that carry value. Build that set by exporting each domain’s most-linked pages from your link tool and intersecting them with the pages that receive organic traffic in Search Console. Map that set page by page to the closest topical equivalent, and handle the long tail with section-level rules that still land each URL somewhere relevant.

Consolidate content, don’t staple it together

A merger is a chance to publish a better page than either site had.

Where both sites covered the same topic, pick the stronger page as the destination and redirect the weaker one to it. Where it is warranted, build one page that absorbs the unique value of both. Pasting two articles into one long page can produce a worse page than either.
Where two pages served different searches, keep both. Two pages answering different questions are two assets. Collapsing them because they sit in the same category gives up one of them for the sake of tidiness.

When the second domain has already gone dark

Sometimes the SEO team arrives after the other domain was switched off without redirects. Every external link to it now leads to an error. Google’s Page indexing help says Googlebot will probably keep trying a 404 URL for some time but will crawl it less and less often. Restore page-level redirects, starting with the most-linked pages, as soon as the mapping for them exists.

Expect fluctuation, and measure against both sites

Google’s site move guide says to expect temporary fluctuation in rankings during a move. Tell stakeholders before the cutover: two properties are being traded for one, fluctuation is expected, and results will be measured against what both sites earned together.

That baseline is the measurement decision to get right first.

Measured against the surviving site alone, the redirected traffic looks like a windfall and hides the losses.
Measured against the larger of the two, the result understates what consolidation cost.
Measured against the combined pre-merger total, it shows whether the merger kept its value.

Don’t answer a dip by reversing redirects or piling on changes. Watch crawl and index status so you can tell an expected fluctuation from an execution error, such as a broken redirect or an accidental noindex.

People can keep searching for the old brand name. A clear page that says the brand is now part of the new company answers that search, and it can sit on the surviving domain.

Frequently asked questions

Will redirecting a high-DA domain raise my rankings?

Not by itself. DA is a tool vendor’s score, not a Google metric. A permanent redirect tells Google the destination should be canonical, and Google’s site move guide says to expect fluctuation while it recrawls. What the destination gains depends on the links, relevance and demand behind the old site.

Should the smaller brand always be redirected into the bigger one?

No. Redirect toward the stronger asset, judged by link quality, brand search and rankings, not by which company did the buying. Sometimes the right move is to consolidate your own site into the acquired domain.

Can an acquired site’s manual action become my problem?

A manual action is a problem Google has already flagged on that site, and consolidating means taking on that site’s history. Check the acquired site’s Manual Actions report before redirecting anything. If there is an action, fix it and tell Google in the reconsideration request that you recently acquired the site.

How long should the redirects stay in place?

As long as possible. Google’s site move guide says generally at least one year. The Change of Address documentation asks for at least 180 days, and longer if the old URLs still receive traffic from Search.