Companies using Yahoo! User Interface Library (YUI)
As of 14 October 2026, Firmable tracks 369,867 companies across 13 countries running Yahoo! User Interface Library (YUI). See who they are, and who to call.
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A breakdown of the 369K+ companies running Yahoo! User Interface Library (YUI).
Top industries
Art, sports and recreation61K+
Hospitality and travel47K+
Professional and business services37K+
Health and wellness35K+
Construction and building22K+
Education and training21K+
Consumer services18K+
Not for profit15K+
No industry recorded: 28K+
Company size
1–1093,189 (49%)
11–5050,215 (27%)
51–25031,952 (17%)
251–5007,359 (4%)
501–1,0001,877 (1%)
1,001–5,0003,477 (2%)
5,001–10,000705 (<1%)
10,001+709 (<1%)
Share of companies with a recorded size, by employees.
No size recorded: 180K+
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Frequently asked questions
About the Yahoo! User Interface Library (YUI) data on this page.
How many companies use Yahoo! User Interface Library (YUI)?
Firmable holds confirmed Yahoo! User Interface Library (YUI) detections for 369,867 distinct companies, 295,257 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Yahoo! User Interface Library (YUI)?
Pierson Ferdinand LLP, ICON International, Inc. and The Michael J. Fox Foundation for Parkinson's Research are among the most prominent in the current set.
What industries use Yahoo! User Interface Library (YUI)?
Art, sports and recreation, hospitality and travel and professional and business services lead the set, across 19 industries in total.
What size companies use Yahoo! User Interface Library (YUI)?
Adoption concentrates in the 1-10 employee band, across the companies whose size is recorded.
Where are Yahoo! User Interface Library (YUI) users based?
The United States, Australia, Canada and New Zealand account for most detections, across 13 countries.
How current is this data?
295,257 companies were confirmed in the last 90 days. Last detection 14 October 2026.
