Key Takeaways:
- The update reinforced existing SEO fundamentals
- Specialist, authority-led sites were the biggest winners
- Thin affiliate and generic “best of” content lost visibility
- “Best” searches now show stronger commercial intent
- Trust, usefulness, and conversion matter more than rankings
In that strange period between Christmas and New Year, where remembering what day of the week it is is a challenge in itself, search rankings started wobbling, and SEOs panicked. Google had delivered a late Christmas gift with the confirmation that its core update rollout had completed on December 29.
Now that the dust has somewhat settled, one thing is clear.
This update didn’t change the rules of SEO; it reinforced them, especially Google’s preferences around specialisation, intent, and usefulness.
At Bright Sprout, we’ve spent the past few weeks analysing search results, client data, and industry chatter. Here’s what actually changed, who won, who lost, and what matters next.
What actually happened during the December core update
The rollout began on December 11 and finished 18 days later on December 29. Thankfully, for an industry that’s been constantly changing as of late, nothing “new” was introduced.
While no big changes around ranking factors or technical requirements have been observed so far, volatility was still high in certain niches.
Specialist sites won, while generalist sites suffered
By specialist, I don’t mean “small”. I mean sites with a clear topical focus, deep coverage, and obvious authority within their niche.
By generalist, I mean sites that publish widely across loosely connected topics, often without sufficient depth in any single area.
This occurred across multiple industries, with the winners being organised sites that had structured topical clusters and evergreen content.
This aligns perfectly with where Google has been heading for years since the helpful content update. E-E-A-T (Experience, Expertise, Authority, Trustworthiness) isn’t just about credentials; it’s about demonstrating over time that your site deserves to rank for a topic.
This update enforced that more decisively.
Affiliate SEO took a major hit
According to data from ALMCORP, 71% of affiliate sites reported negative impacts from the update.
If you aren’t familiar with affiliate SEO, think of your typical ‘Top 5 X on Amazon in 2026’ style articles. These are sites that publish articles designed to rank well on Google, so people click through to product links. The site then earns money when someone buys.
When you compare the ethos of much affiliate content to Google’s content guidance, this drop-off comes as no surprise.
The issue with affiliate SEO is intent mismatch. A large number of affiliate sites rely on “best of” and comparison content that exists primarily to rank, not to help. Thin reviews, generic summaries, and surface-level comparisons aren’t helpful to users or Google.
On the contrary, genuinely useful affiliate content largely held steady.
We saw better performance from sites that:
- Used products themselves
- Explained trade-offs clearly
- Focused on one niche instead of many
- Matched the reader’s decision stage accurately
In other words, Google isn’t punishing affiliate SEO; rather, it’s rewarding experience-led content over SEO-led content. This mirrors the growing effectiveness of user-generated content in establishing trust, one of the key factors in EEAT.
How ‘best of’ search results changed after the update
One of the most interesting shifts we observed was how Google treated “best of” queries.
Historically, many of these queries returned long-form informational guides, dominated by the aforementioned affiliate SEO sites. After the December core update, we’re seeing more commercial and transactional results, even when the query looks informational on the surface.
In practice, that means:
- Fewer generic guides
- More comparison-led pages
- Stronger commercial intent baked into SERPs
This suggests Google believes users searching “best X” are closer to deciding than they used to be. And the algorithm is adjusting accordingly.
For publishers relying on informational dominance alone, that’s a problem. For businesses with genuinely useful product-led content, and/or well-written product/service pages, it’s a golden opportunity.
News publishers and online communities saw the most volatility
Beyond affiliate SEO, another sector that experienced real turbulence was news and community-driven sites.
Semrush data declared news as the most volatile sector, closely followed by online communities. Some of the UK’s biggest publishers saw noticeable drops in visibility while others gained ground.
For example:
- The Guardian and The Telegraph both experienced declines across certain query types
- The Times and MoneySavingExpert emerged as relative winners
This wasn’t about “good” or “bad” journalism. It appeared to come down to how well the content aligned with search intent, trust signals, and audience loyalty.
MoneySavingExpert, in particular, possesses authority, clarity, and usefulness. It doesn’t just report, it helps people make decisions.
Online communities and forums also experienced sharp swings. Some threads gained visibility overnight, others vanished. This suggests Google is still actively testing how community content fits into modern search, following the increasing prominence of Reddit in SERPs over the past few years.
What should you do
Google’s guidance hasn’t changed: create satisfying, people-first content.
What has changed is how confidently Google enforces that standard.
Every core update triggers panic. We see it every time. Pages get deleted, links get disavowed, and theories spiral on social media. In most cases, that does more harm than good.
Core updates reward consistency. Overreaction usually makes things worse.
At Bright Sprout, our advice hasn’t changed either.
We’re helping clients:
- Strengthen topical authority instead of chasing keywords
- Remove overlapping content that dilutes relevance
- Improve clarity, usefulness, and intent alignment
- Optimise for satisfaction and conversion, not just rankings
SEO no longer works in isolation. It now sits alongside brand trust, UX, and content quality. Treating it as a standalone traffic lever is increasingly risky.
If your site exists solely to generate traffic, this update serves as a reminder to evolve. Google is no longer the predictable traffic engine it once was. Replacing lost demand with social media or PPC is often necessary. That doesn’t mean SEO is dead; the focus has shifted to getting people who visit your site to convert.
If you’re unsure how your site stacks up after the December core update, our SEO team can help you audit performance, prioritise fixes, and build a strategy that holds up through volatility. Explore our SEO services today to learn more.
Final thoughts
The December core update wasn’t a shock. It was a signal.
Google is getting far better at understanding who the content is for, why it exists, and whether it genuinely helps. Sites aligned with that direction will continue to grow visibility over time, and sites that aren’t will keep experiencing these sharp, confidence-shaking drops.
If there’s one takeaway to carry into 2026, it’s this:
Clarity beats cleverness.
If you need help making sense of how this update affected your site, or want a clear plan for what to do next, get in touch with us today.
