Just as most of us were preparing for some holiday chill, Google gave us an early Christmas “present” – a new core algorithm update which officially started rolling out on December 3, 2020.

SearchLiaison’s tweet confirmed that, by the time we get to Christmas, we should have witnessed the entire reach of the third core update of 2020. 

Early Signs of a Core Update with Substantial Impact 

At the outset, the December 2020 core update looked like it could have a bigger impact than the one back in May

Early Semrush Sensor data suggests that this could be the case, as the average SERP volatility on December 4 had a score of 9.4 – similar to the May 2020 core update. January’s core update stood at a comparably lower 8-point mark.


Semrush Sensor data

Since we’re still only in the first few days from roll-out, I’d suggest we wait until the update has finished to understand its full impact. 

In the meantime, keep an eye on your traffic and visibility changes. Even if you’re hit pretty hard at the start of a core update, it’s not uncommon to recover (even partially) while the update is still happening.

December 2020 Core Update Winners and Losers

Multiple sectors seem to be affected this time. On December 4, the second day of the roll-out, SERPs for most site categories reached a 9.4 volatility mark (and all of them presented volatility above 9), even SERPs that on the first day of the update seemed to be relatively unaffected by it like Books & Literature and Real Estate. Even “green zone” categories (industries that rarely experience any noticeable volatility outside a broad algorithm update) this time shook hard.

On the same day, we also spotted a sudden spike in Shopping results on SERPs, which then quickly returned to pre-update levels.


Semrush Sensor data

The most affected industries

In general, the most affected sectors across both desktop and mobile are Health, Real Estate, and Law & Government. On desktop search, the Travel and Finance categories were also seeing high volatility rates in the first days of this roll-out; on mobile, Jobs & Education and Pets & Animals sector sites to the list. 

The most affected sites by domain size

It seems that large domains are so far affected the most. Almost 50% of the biggest winners and losers so far are domains with traffic surpassing 1 million monthly visitors.



The most affected sites by category

Although this update has a significant impact across numerous industries, we have grouped winning and losing domains by industry below. 

SERPs Winners

On the winning side are sites operating within the

Business & Industrial,Internet & Telecom and Beauty & Fitness industries.


On average, the biggest SERPs winners gained 20 positions, with sites like zoominfo.com (a for-sale business contact database) seeing their average rankings jumping 67 positions on December 3 and 4. LinkedIn was another big winner, moving up 47 positions on average on the day. 

With the results of the pandemic still dominating the economy these substantial adjustments could reflect the rapidly changing landscape in business and recruitment.

Here are the 10 sites that witnessed the largest position spikes on the first day of the December 2020 core update: 

Top 10 SERP Winning Domains (Dec 3-4)

SERP Losing Domains

Among the domains that saw the biggest organic ranking losses, sites in the Online Communities, Shopping and News sectors present the biggest position drops.


On December 4, the average position loss for sites across the worst affected industries was a whopping 23 positions. But domains like yellowpages.com and newsbreak.com saw even more dramatic drops, losing 94 and 83 positions respectively in a single day.

Here are the top 10 sites that suffered the most once December’s core update starting rolling out:

Top 10 SERP Losing Domains (Dec 3-4)

Navigating Through the December 2020 Update

The SEO community seems to be questioning the bad timing of the update – it was rolled out after Black Friday and Cyber Monday, but right before Christmas (and in a year like 2020!). 

Marie Haynes dag out a tweet by Matt Cutts from 2013, which contradicts the timing of this update. Although John Mueller told Barry Schwartz that he sees no issue, for many businesses whose biggest sales surge occurs just before the Chrismtas holidays, this algorithm update could be a matter of significant distress.

As with all other core updates, Google’s advice remains consistent:

Wait until the update’s fully rolled-out before you decide to make any significant changes to your website. 

Although Google claims that sites can see some recovery in-between core updates, if you’ve been negatively affected you will still have to work on perfecting your SEO and content experience after this update is complete:

Keep monitoring your online visibility and rankings – the Position Tracking tool’s custom triggers can be a big help here if you want to spot any position drops in a timely manner.

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