The short version: Two big things are happening in Google Search right now. First, the September 2026 spam update (launched September 24) is still rolling out and could run until around October 8 — the longest spam update of the year. Second, new data shows AI Overviews exploded on branded searches in September, jumping from about 26% to over 90% of tracked brand queries. If you run a business, here’s what both mean for you — and the one thing you should not do this week.

What’s happening with the September 2026 spam update?

Google unleashed the September 2026 spam update on September 24, 2026, and unusually, estimated the rollout could take up to two weeks — which points to around October 8. For context, the year’s three earlier spam updates each wrapped up in under three days, so this one is being treated as a bigger deal. A second wave of volatility hit around October 1–2, suggesting the rollout is happening in phases.

Google hasn’t said which spam tactics this update targets. That’s normal — Google rarely does. The October 2026 Google Webmaster Report recaps the timeline, and also notes Google is testing paying publishers for content used in AI Mode and AI Overviews (though payouts sound small), plus new AI performance reports in Search Console.

The one thing not to do: don’t make reactive changes to your site while a spam update is still rolling out. Rankings will bounce around. Compare your Search Console data from before vs. after September 24, take notes, and wait for Google to confirm the rollout is complete before you touch anything. Changing things mid-rollout is like steering during turbulence — you’ll usually make it worse.

AI Overviews just surged on branded searches — the data

Here’s the number that stopped us in our tracks. DemandSphere tracked AI Overview presence across branded keywords through September 2026 and found it rose from 26.12% on September 1 to a peak of 90.48% on September 27, settling at 82.06% on September 29 — all without any official announcement from Google.

One important nuance, flagged in the writeup of the data: DemandSphere measured whether an AI Overview appeared on the results page — not whether your brand was actually cited or mentioned inside it. So this doesn’t prove your branded traffic fell. But it does make branded AI visibility something you should be measuring, not guessing about.

Why does this matter so much? Because branded searches — people literally typing your business name — used to be the safest traffic you had. If Google now answers “what is [your brand]” with an AI-generated summary, you need to make sure that summary is accurate, flattering, and cites you. That means: a complete Google Business Profile, consistent business information everywhere, fresh reviews, and clean structured data on your site. (This is the core of what we cover in our GEO guide: how to win in AI search.)

Three more changes from the past week worth knowing

Beyond the two headlines, a few smaller rollouts from the past week affect local businesses directly:

1. Google is testing URL tracking for AI Overview clicks

Google has begun testing dedicated tracking parameters on links clicked inside AI Overviews and AI Mode, according to reports this week. For months, marketers complained that AI-referred visits looked identical to regular organic visits in Google Analytics. If this rolls out widely, you’ll finally be able to segment AI-search visitors and see whether they convert better or worse than traditional searchers. Worth setting up a GA4 segment for once it lands.

2. Local Service Ads are hiding phone numbers

Google started hiding raw phone numbers by default on Local Service Ads, pushing users toward native tracked call buttons instead. If you run LSAs, double-check your call tracking still attributes correctly — and expect your “calls from ads” reporting to shift toward Google’s native numbers.

3. Google Maps now requires sign-in to read all reviews

Google Maps now asks users to sign in to a Google account to see every review on a Business Profile, and to sort or leave reviews. As the weekly marketing trends roundup notes: check your listing while signed out to see what a stranger actually sees — and keep your best reviews displayed on your own website too, where you control them.

What should a business owner actually do this week?

1. Don’t panic-tweak your site. The spam update is still rolling out. Document ranking changes; act after Google confirms completion (~October 8).
2. Google your own brand name. Is there an AI Overview? Is it accurate? Does it cite you or a competitor? Screenshot what you see — this is your new reputation front line.
3. Audit the accuracy signals AI pulls from. Your Business Profile info, reviews, website schema, and “about” pages are what AI Overviews synthesize. Inaccuracies here now cost you twice: in classic search and in AI answers.
4. Review anything AI-generated on your site. This pairs directly with Google’s October 1 guidance update: human review of AI-assisted titles, descriptions, schema, and alt text is now explicitly “critical.”
5. Keep your reviews on your own site too. With Maps gating full review visibility behind sign-in, your website should showcase testimonials independently.

Search is changing faster right now than at any point since mobilegeddon — and most small businesses are navigating it with a strategy built for 2022. If you want someone to look at your Google presence, your search traffic, and your AI visibility together and tell you what to fix first, that’s literally what we do. Book a call with us and we’ll sort it out.

Frequently asked questions

When will the Google September 2026 spam update finish rolling out?

Google launched the September 2026 spam update on September 24 and estimated up to two weeks for the full rollout, suggesting completion around October 8, 2026. A second wave of ranking volatility was observed around October 1–2. Wait for Google’s official confirmation before making reactive site changes.

What did the DemandSphere data show about AI Overviews on branded searches?

DemandSphere reported AI Overview presence on tracked branded keywords rose from 26.12% on September 1, 2026, to a peak of 90.48% on September 27, ending the month at 82.06%. The data measures AI Overview presence on the page, not whether the brand was cited within the overview, and Google made no official announcement about the increase.

Should I change my SEO strategy because of AI Overviews?

Evolve it, don’t abandon it. AI Overviews appear most on informational queries and far less on transactional ones. Keep investing in commercial-intent content (pricing, comparisons, hiring guides) while restructuring informational content — clear headings, direct answers, sourced statistics, schema — so AI Overviews cite you instead of replacing you. Our analysis of what AI search means for brands in 2026 goes deeper.

How can I track traffic coming from AI Overviews?

Google is testing dedicated URL tracking parameters for AI Overview and AI Mode citation links, which would let you segment AI-referred visits in GA4. Until that rolls out widely, monitor Search Console’s AI performance reports, track brand mentions in AI answers manually, and watch for traffic pattern changes on informational pages.