Similarweb Ltd. Ordinary Shares (SMWB)
SMWB moved a median of -0.07% 30 minutes after news, and -0.10% by the close. How SMWB actually reacts to news — the realized, point-in-time move the market made, measured across 220 labeled events over the last three years with zero look-ahead.
SMWB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 42% | 215 |
| 30-min | -0.07% | 46% | 216 |
| 60-min | +0.18% | 51% | 216 |
| to close | -0.10% | 47% | 220 |
| Middle 50% of SMWB reactions | -1.50% to +1.21% |
|---|---|
| Median reaction (30-min) | -0.07% |
| Measured reactions | 220 |
Half of all Similarweb Ltd. Ordinary Shares news events land between -1.50% and +1.21% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How SMWB reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 14 | -1.13% | 29% | +3.41% |
| Analyst downgrades | 21 | -2.92% | 33% | -2.92% |
| Coverage initiations | 10 | +1.05% | 70% | +4.84% |
| Rating reiterations | 61 | +0.47% | 59% | +0.56% |
| Price-target raises | 11 | +1.31% | 55% | +1.40% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 1 further class was observed with fewer than 10 measured events and is not published. See how SMWB ranks against every other measured name →
That’s how SMWB usually reacts — get an email when it moves on news →Email me when SMWB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to SMWB's baseline. Nothing else.
Recent SMWB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 6-K SIMILARWEB LTD. For: Oct 08 | SEC filing · Form 6-K | SEC EDGAR | +1.66% | +3.44% | |
| Form 6-K SIMILARWEB LTD. For: Sep 24 | SEC filing · Form 6-K | SEC EDGAR | -0.07% | +1.07% | |
| Similarweb Names Michael Akkerman as New Chief Executive Officer | Press release | Business Wire | -2.17% | -9.28% | |
| Similarweb State of Ecommerce 2026 Report Details How AI is Changing Shopper Journey | Press release | Business Wire | -1.62% | +1.00% | |
| NIQ and Similarweb Advance Agentic Commerce Measurement for the AI Shopping Era | Press release | Business Wire | +1.00% | -2.56% | |
| Similarweb Unlocks the Black Box of AI Ad Placements Across ChatGPT, Google AI Overviews, and AI Mode | Press release | Business Wire | -1.10% | -4.46% | |
| Form 6-K SIMILARWEB LTD. For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | -5.29% | +3.41% | |
| Similarweb Announces Second Quarter 2026 Results | Press release | Business Wire | -5.29% | +3.41% | |
| Similarweb to Announce Second Quarter 2026 Financial Results on August 12, 2026, Before Market Open | Press release | Business Wire | -0.81% | +5.27% | |
| Similarweb Secures Multi-Year, Seven-Figure ARR Contracts Worth Approximately $47 Million in Total Contract Value | Press release | Business Wire | +3.91% | +10.99% | |
| Similarweb Expands AI Ecosystem with Perplexity Collaboration Through Native AI Workflows | Press release | Business Wire | -2.84% | +2.13% | |
| Form 6-K SIMILARWEB LTD. For: May 28 | SEC filing · Form 6-K | SEC EDGAR | +1.44% | -0.72% | |
| Form 6-K SIMILARWEB LTD. For: May 14 | SEC filing · Form 6-K | SEC EDGAR | +0.70% | +7.72% | |
| Form 6-K SIMILARWEB LTD. For: Mar 31 | SEC filing · Form 6-K | SEC EDGAR | +6.09% | -8.65% | |
| Form 6-K SIMILARWEB LTD. For: May 13 | SEC filing · Form 6-K | SEC EDGAR | +6.09% | -8.65% | |
| Similarweb and Manus Expand Data Coverage, Enabling Deeper Digital Marketing Insights and Smarter AI Agents | Press release | Business Wire | +6.09% | -8.65% | |
| Similarweb Announces First Quarter 2026 Results | Press release | Business Wire | +6.09% | -8.65% | |
| Similarweb Initiates CEO Succession Planning Process | Press release | Business Wire | +6.09% | -8.65% | |
| Similarweb to Announce First Quarter 2026 Financial Results on May 13, 2026, Before Market Open | Press release | Business Wire | +0.74% | +4.07% | |
| Form 6-K SIMILARWEB LTD. For: Apr 23 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +0.00% | |
| Form 6-K SIMILARWEB LTD. For: Mar 26 | SEC filing · Form 6-K | SEC EDGAR | +0.76% | +0.76% | |
| Similarweb Appoints Harel Beit-On as Chairman of its Board of Directors | Press release | Business Wire | +0.76% | +0.76% | |
| Similarweb Expands Ecommerce and Digital Shelf Analytics with Retail Intelligence Suite | Press release | Business Wire | +0.73% | +1.82% | |
| Similarweb Files 2025 Annual Report on Form 20-F | Press release | Business Wire | -0.40% | +6.35% | |
| Similarweb Report Benchmarks AI Brand Visibility Winners and Overachievers | Press release | Business Wire | -0.40% | +6.35% | |
| Form 20-F SIMILARWEB LTD. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | +1.80% | +4.00% | |
| Form S-8 SIMILARWEB LTD. | SEC filing · Form S-8 | SEC EDGAR | +1.80% | +4.00% | |
| Form 6-K SIMILARWEB LTD. For: Feb 23 | SEC filing · Form 6-K | SEC EDGAR | -0.37% | -6.25% | |
| Form 6-K SIMILARWEB LTD. For: Dec 31 | SEC filing · Form 6-K | SEC EDGAR | -7.02% | -14.72% | |
| Similarweb Announces Fourth Quarter and Fiscal 2025 Results | Press release | Business Wire | -7.02% | -14.72% | |
| Similarweb Launches AI Studio: Enterprise Intelligence That Puts Expert Market Research at Every Employee's Fingertips | Press release | Business Wire | +0.21% | -1.06% | |
| Similarweb and Bloomberg Expand Data Available on the Bloomberg Terminal | Press release | Business Wire | +0.49% | -8.23% | |
| Similarweb to Announce Fourth Quarter 2025 Financial Results on February 17, 2026, After Market Close | Press release | Business Wire | +0.38% | -1.51% | |
| Similarweb’s Annual Digital 100 Report Finds “Serious Utility” Powers the Fastest Growing Websites and Apps | Press release | Business Wire | +2.13% | -1.83% | |
| Similarweb’s Digital 100 Awards Celebrate Web and App Growth in the US, UK, France, Germany, Japan, Australia, India, Brazil, and South Korea | Press release | Business Wire | +2.13% | -1.83% | |
| Manus Collaborates with Similarweb to Give AI Agents Digital Marketing Insight | Press release | Business Wire | +0.89% | -4.61% | |
| AI Discovery Surges: Similarweb's 2025 Generative AI Report Says | Press release | Business Wire | -0.81% | -1.03% | |
| Similarweb Fall 2025 Updates Double Down on Data-Driven AI to Give Businesses a Competitive Edge | Press release | Business Wire | -0.58% | -7.95% | |
| Form 6-K SIMILARWEB LTD. For: Sep 30 | SEC filing · Form 6-K | SEC EDGAR | -0.41% | +5.96% | |
| Similarweb Announces Third Quarter 2025 Results | Press release | Business Wire | -0.41% | +5.96% | |
| Form 6-K SIMILARWEB LTD. For: Oct 27 | SEC filing · Form 6-K | SEC EDGAR | +0.34% | +2.72% | |
| Similarweb Names Ran Vered Chief Financial Officer | Press release | Business Wire | +0.34% | +2.72% | |
| Similarweb to Announce Third Quarter 2025 Financial Results on November 11, 2025, After Market Close | Press release | Business Wire | +1.51% | +1.98% | |
| Similarweb Web Intelligence 4.0: Data You Can Trust to Help You Win Your Market | Press release | Business Wire | +0.51% | +0.34% | |
| Similarweb’s 3rd Annual Global Ecommerce Report: Growth Shifts to Apps and AI | Press release | Business Wire | -0.20% | -1.58% | |
| Similarweb Launches MCP Server to Power AI Workflows with Comprehensive Digital Intelligence | Press release | Business Wire | -0.70% | -1.30% | |
| Form 6-K SIMILARWEB LTD. For: Sep 02 | SEC filing · Form 6-K | SEC EDGAR | +1.00% | +2.43% | |
| Similarweb Announces Planned CFO Departure After 10 Years Of Service | Press release | Business Wire | +1.00% | +2.43% | |
| Form 6-K SIMILARWEB LTD. For: Aug 28 | SEC filing · Form 6-K | SEC EDGAR | -0.63% | -0.10% | |
| Similarweb Names Tamar Rapaport-Dagim to its Board of Directors | Press release | Business Wire | -0.63% | -0.10% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the SMWB section they belong to.
Where else SMWB is measured.
SMWB earnings → · Analyst actions → · SEC filings →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Similarweb Ltd. Ordinary Shares's median reaction calculated?
Every labeled SMWB news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 220 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 46% of SMWB's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does SMWB's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.