Information gain isn't new, Google patented it back in 2019. But it took the March 2026 update to dial up the signal strength to the point where sites that regurgitate top content visibly drop. Pages that add unique data, first-hand experience or perspective rise.
What exactly is information gain?
It's a ranking signal that measures how much new information your page adds compared to what's already in the top-10. Writing an SEO tips article with the same 10 points every competitor lists? Information gain = low. Adding your own benchmark, a unique case, or a contrarian view? Information gain = high.
Three types of information gain that work
1. Original data
A sample of 100 client sites with a table of their average INP scores. An internal database query showing 73% of checkout flows have a long task on the payment step. Anything only you can produce because only you have the data.
2. First-hand experience
Not "5 tips you should know". Yes: "We implemented llms.txt on 14 client sites in 2025, here's what happened". E-E-A-T's *Experience* (the first E) has been weighted more heavily since December 2025. Concrete projects with concrete numbers outweigh abstract advice.
3. Contrarian but defensible opinions
"AI Overviews lowers CTR, but not for brands that get cited", if you bring that nuance with data, you get clicks from people who don't trust the mainstream take. Risk: if you're contrarian without evidence, you get nothing.
What lost in March 2026?
- Generic listicles that summarise other top-10 articles
- AI-generated content without human editing or unique angle
- Affiliate sites copy-pasting manufacturer product specs
- How-to pages without author bio or date stamp
- Pages that count words but show no knowledge
What won?
- Research reports with own methodology
- Forums and community posts (Reddit got a boost)
- Pages with case studies including actual numbers
- Sites with clear author names, bios, and LinkedIn links
- Content updated within the last 90 days with explicit dateModified
How do you measure it?
Not directly, Google doesn't publish an information-gain score. Indirectly: compare your positions before and after March 2026. Pages that rose while competitors fell = proof you added value. Pages that fell while competitors rose = probably too generic.