Shopify began rolling out session measurement improvements in Analytics from 21 September 2026 (deploying through 23 September). The update changes how sessions are counted and how bot traffic is treated in session-related reports. Orders, sales and customer counts are not rewritten by this change. Session-based rates often are.
That distinction matters for anyone doing CRO, agency reporting, or month-on-month board packs.
What Shopify changed
Shopify's own changelog and Help Centre describe three practical shifts:
1. Identified bot sessions are filtered by default
Where the Human or bot session filter is available, identified bot sessions are now excluded from session-related reports by default. You can still open the filter and include bots when you want the fuller picture.
If bots previously inflated sessions, default conversion rate can rise without a single extra order. Your marketing did not necessarily get better overnight. The denominator got cleaner.
2. Sessions no longer auto-end at midnight UTC
Sessions are now based on continued customer activity, not an automatic cut at midnight UTC. A shopper browsing either side of the UTC date change is less likely to be split into two sessions for calendar reasons alone. That should feel more like a real shopping journey — and it can change session counts versus the old method.
3. Some journeys without a traditional pageview now count
Shopify can now count some legitimate journeys that start without a standard storefront pageview — for example opening a cart or checkout link directly. That can increase reported sessions for some stores, which is the opposite direction to bot filtering.
There is no single percentage every merchant will see. Different stores will feel different mixes of "fewer bots" and "more real journeys".
Which metrics can move — and which stay put
Because so many ecommerce KPIs are built on sessions, Shopify notes that the following can look different after the update:
- Sessions
- Conversion rate
- Add-to-cart rate
- Reached checkout rate
- Checkout conversion rate
- Bounce rate
- Pageviews per session
- Online store visitors
- Searches
What this update does not change: orders, sales, and customer counts. Use those as your anchor when Analytics looks noisy.
Bot classification in Shopify Analytics also only applies to sessions from 7 October 2025 onward — another reason long historical comparisons need a footnote.
Treat 21 September 2026 as a new Analytics baseline
Shopify itself recommends treating the change as a new baseline for session-based metrics. Be careful with:
- August vs September 2026
- September 2025 vs September 2026
- Before vs after 21 September 2026
Historical data was not rewritten so every old session uses the new methodology. Annotate the date in client decks and internal dashboards now, while the memory is fresh.
How UK merchants should read the numbers this week
Use a simple stack when something looks "off":
Revenue → Orders → Customers → Sessions → Conversion behaviour
- Conversion rate up, orders and revenue flat → check measurement and bot filter before crowning a CRO win.
- Sessions down, revenue stable → bot filtering may explain part of the drop.
- Sessions up → Shopify may now be counting legitimate non-pageview journeys.
- Shopify Analytics ≠ Google Analytics session totals — different definitions, bot rules and cookies. Aim for a consistent baseline in each tool, not identical numbers.
Don't judge a CRO test only on the new conversion rate
If you launched a PDP redesign, cart drawer, or checkout messaging mid-September, your experiment now overlaps a measurement change. Separate real behaviour from measurement before you keep, kill or scale the test. Look at orders, revenue and supporting evidence — not conversion rate alone.
Why this matters for Clarity Growth
Clarity Growth works with UK Shopify merchants on storefront performance, CRO and reporting that leadership can trust. When Analytics methodology shifts, the risk is not the update itself — it is misreading a cleaner (or differently counted) session model as a business result. We help teams baseline correctly, keep CRO decisions honest, and connect Shopify data into the wider ops stack so dashboards stay useful after platform changes like this.
Sources
- Shopify Analytics session measurement improvements — Shopify Changelog (21 September 2026)
- Changes to sessions and conversion rate in Shopify Analytics — Shopify Help Centre
- Bot filtering in Shopify analytics and reports — Shopify Help Centre
- Shopify Analytics Changed in September 2026: What Merchants Need to Know — Moon Impact (23 September 2026)
Shopify ecommerce built to perform.
Clarity Growth helps UK merchants build, optimise and scale Shopify storefronts that leadership can trust — cleaner data, stronger conversion, and reliable reporting that survives platform changes.