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Technology answer

Twenty Fifteen

18,001

companies run it, 0.03% of 54,527,857 in the index. Landing 12 Sept 2026.

Hosts: 51,028 live hosts run it, of 191,809,695 hosts in the index, 0.03%. A host is a website, not a company.

Companies by month

Companies, monthly, on the fixed panel of sites crawled since 2020of 54,527,857 in the indexlanding 12 Sept 2026

18,001 at Sept 26; 19,465 twelve months earlier, -1,464, -7.5% on the fixed panel; the series starts January 2021 because the panel is anchored at 31 Dec 2020

The 69 numbers in this chart
MonthCompaniesObserved on the panel
2021-0100
2021-0200
2021-0300
2021-0400
2021-0500
2021-0600
2021-0700
2021-0800
2021-0900
2021-1000
2021-1100
2021-1200
2022-0100
2022-0200
2022-0300
2022-0400
2022-0500
2022-0600
2022-0700
2022-0800
2022-0900
2022-1000
2022-1100
2022-1200
2023-0100
2023-0200
2023-0300
2023-04902205
2023-051,600364
2023-062,298523
2023-072,996682
2023-083,695841
2023-094,3931,000
2023-105,0911,159
2023-115,7891,318
2023-126,4881,477
2024-017,1861,636
2024-027,8841,795
2024-038,8672,019
2024-049,8192,236
2024-059,8692,247
2024-0610,1262,306
2024-0710,3822,364
2024-0810,6762,431
2024-0911,2242,556
2024-1011,9642,724
2024-1112,7632,906
2024-1213,5423,084
2025-0114,4513,291
2025-0215,3053,485
2025-0316,1593,680
2025-0416,7503,814
2025-0517,3343,947
2025-0617,9424,086
2025-0718,5254,218
2025-0819,1034,350
2025-0919,4654,432
2025-1019,5714,457
2025-1119,4854,437
2025-1219,3414,404
2026-0119,2184,376
2026-0219,0564,339
2026-0318,9854,323
2026-0418,8864,301
2026-0518,7434,268
2026-0618,6214,240
2026-0718,4374,198
2026-0818,2414,154
2026-0918,0014,099

Both denominators, and a third

Shares of the same 18,001each row a different wholelanding 12 Sept 2026

Denominator
Companies
Share
companies in the index
54,527,857
0.03%
companies running anything in Themes
6,092,832
0.30%
companies running anything in WordPress themes
5,818,927
0.31%

Three wholes, three shares of one count: a share travels with its whole, never alone. Against the last of them, Twenty Fifteen is rank 35 of 165 technologies in WordPress themes.

Open as a segment

18,001 companies; add a country, a sector or a band on the segment page. Counting is free.

/companies/tech-twenty-fifteen

Open the segment

Catalogue record

As recorded in the cataloguetaxonomy release tax-2026.10last discovered 10 Sept 2026

The default 2015 theme for WordPress, available from WordPress.org.

Twenty Fifteen is a free, open-source WordPress theme. It serves as a design template for self-hosted WordPress sites and is maintained by WordPress.org contributors.

Kindextension
VendorWebsynthlabs (Website Development & Training), wordpress.org
PathWeb Platform and Content > Themes > WordPress themes
Slugtwenty-fifteen
Deploymentself-hosted
Pricingfree
Open sourceyes
First discovered2023-10-05
Last discovered2026-09-10
Taxonomy releasetax-2026.10