Of 116 professional services homepages we could read on 21 October 2026, 23 run on Sitecore, 19 on WordPress and 16 on Adobe Experience Manager. Webflow runs five and HubSpot CMS three. Across the web, W3Techs puts Sitecore on less than 0.1% of sites with a known CMS, so large firms that sell expertise sit about as far from the average website as any group we have checked.
This page sets our check of 122 firms against W3Techs share by site rank, HTTP Archive field speed by platform, one law-firm study and one vendor survey on who runs the website. Every figure carries its source and date. We build marketing sites in Webflow, so the bias is stated; the counts are what each site's own code shows.
What 122 professional services firms run their websites on
No one publishes a census of professional services website platforms. W3Techs reports share by traffic rank, not by industry, so we built a sample.
Method. We listed 123 firms across seven groups: law, accounting and advisory, management consulting, IT services, engineering and architecture, recruitment and executive search, and marketing, PR and creative agencies. It is a judgement sample that leans towards large US and UK firms, so treat it as a picture of the upper market. On 21 October 2026 we fetched each homepage and its /insights path with an ordinary browser request and read the HTML, headers and cookies for platform fingerprints: Sitecore media paths and language cookies, Adobe's /content/dam and clientlibs paths, Optimizely's /globalassets/ paths, Webflow's page attributes, WordPress's wp-content paths, generator tags and the build files of JavaScript frameworks. Sixteen homepages refused the plain request and were read through a rendering proxy. Marcum's domain now serves CBIZ's site, so we dropped it, leaving 122. Six firms blocked both routes: McKinsey, Crowe, Alvarez & Marsal, EPAM, Globant and Perficient.
| Platform | Homepages | Examples |
|---|---|---|
| Sitecore | 23 | Kirkland & Ellis, Latham & Watkins, DLA Piper, Linklaters, Plante Moran, Huron, WSP |
| WordPress | 19 | CBIZ, Withum, Saffery, Capgemini, AECOM, SOM, Weber Shandwick |
| Adobe Experience Manager | 16 | Deloitte, PwC, EY, KPMG, Accenture, Booz Allen, Robert Half |
| JavaScript framework with or without a headless CMS | 15 | Baker Tilly, West Monroe, R/GA, Huge, Mother, BIG |
| Drupal | 12 | Fenwick, L.E.K. Consulting, Protiviti, Jacobs, Randstad, Edelman, Ogilvy |
| Optimizely CMS | 6 | Freshfields, Bain, Arup, Mott MacDonald, Valtech, Cherry Bekaert |
| Webflow | 5 | Korn Ferry, Russell Reynolds, Harvey Nash, Pilot, STX Next |
| HubSpot CMS | 3 | Endava, Netguru, Burns & McDonnell |
| Other packaged CMS | 8 | RubyApps at Gunderson Dettmer and Wilson Sonsini, Liferay at Kearney and Hays, Umbraco, Kentico, Craft CMS, Statamic |
| Custom build, no CMS fingerprint | 9 | BCG, Mishcon de Reya, Roland Berger, Gensler, Pentagram |
| Not identified, bot protection | 6 | McKinsey, Crowe, Alvarez & Marsal |
Source: Octo Agency check of 122 professional services homepages, 21 October 2026
Where a site renders Sitecore or Optimizely content through a Next.js front end, we counted it under the CMS, because that is the system the marketing team edits. Russell Reynolds is a split case: its homepage is a Webflow build, while its insights section is served from Sitecore. The Wilson Sonsini call is inferred: its asset paths match Gunderson Dettmer's, which sends a RubyApps header, a CMS sold to law firms.
Law runs on Sitecore, the Big Four on Adobe
The split by profession is sharper than the overall count.
| Segment | Firms | WordPress | Webflow | HubSpot CMS | Sitecore | Adobe Experience Manager | Optimizely | Drupal | Other packaged CMS | JavaScript framework | Custom or not identified |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Law | 19 | 1 | 0 | 0 | 10 | 1 | 1 | 2 | 3 | 0 | 1 |
| Accounting and advisory | 21 | 4 | 1 | 0 | 4 | 6 | 1 | 0 | 1 | 2 | 2 |
| Management consulting | 20 | 1 | 0 | 0 | 4 | 3 | 1 | 3 | 2 | 2 | 4 |
| IT services | 16 | 2 | 1 | 2 | 0 | 4 | 1 | 1 | 0 | 2 | 3 |
| Engineering and architecture | 17 | 4 | 0 | 1 | 2 | 1 | 2 | 2 | 0 | 3 | 2 |
| Recruitment and executive search | 13 | 1 | 3 | 0 | 3 | 1 | 0 | 2 | 1 | 0 | 2 |
| Marketing, PR and creative agencies | 16 | 6 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 6 | 1 |
| All | 122 | 19 | 5 | 3 | 23 | 16 | 6 | 12 | 8 | 15 | 15 |
Source: Octo Agency check, 21 October 2026. Custom or not identified includes the six blocked sites and one static Jekyll build
Law. Kirkland & Ellis, Latham & Watkins, DLA Piper, Baker McKenzie, Cooley, Linklaters, Orrick, Goodwin, Irwin Mitchell and Lewis Silkin all run Sitecore. Slaughter and May runs Umbraco, Freshfields Optimizely and Clifford Chance Adobe. Kingsley Napley is the only WordPress site among 19 law firms.
Accounting. Deloitte, PwC, EY and KPMG run Adobe Experience Manager, as do Grant Thornton and RSM. The mid-market is mixed: Plante Moran, CLA and Eide Bailly run Sitecore, BDO runs Kentico, and CBIZ, Withum, Menzies and Saffery run WordPress.
Recruitment is the one segment where Webflow shows up in numbers: Korn Ferry, Russell Reynolds and Harvey Nash, three of 13.
Agencies build like their clients' engineers. Six of 16 run JavaScript front ends on headless content stores such as Contentful, Contentstack, Sanity, Prismic and Strapi, and six run WordPress.
Smaller firms: the WordPress picture
Our sample is top-heavy, and that changes the answer. Constellate, a marketing firm that sells only to law firms, analysed 303 law firm homepages from Google results in 25 mid-size US markets in March 2024. It found 63%, or 191 sites, on WordPress, and 101 of the remaining 112 on custom builds with no off-the-shelf platform. Among the WordPress sites, Elementor showed on 27.2% and Divi on 26.7%.
Read the two together. A local firm's site is most likely WordPress with a page builder. A national or global firm's site is most likely an enterprise platform run by an IT team, often Sitecore in law and Adobe in accounting. Our sister post, Professional Services Website Conversion Rate Statistics 2026, covers how these sites perform once built.
Web-wide share against the professional services count
W3Techs reports each CMS's share of the sites where it can identify one, broken down by traffic rank. Our sample counts homepages only, and W3Techs does not count a Next.js front end as a CMS, so the comparison is rough.
| Platform | All sites with a known CMS | Top 1,000,000 | Top 10,000 | Professional services homepages, of 116 readable |
|---|---|---|---|---|
| WordPress | 58.3% | 48.3% | 50.7% | 19 |
| Webflow | 1.2% | 1.5% | 2.3% | 5 |
| Drupal | 0.9% | 3.7% | 6.7% | 12 |
| HubSpot CMS | 0.2% | 1.0% | 1.1% | 3 |
| Adobe Experience Manager | 0.1% | 1.0% | 5.3% | 16 |
| Sitecore | Less than 0.1% | 0.3% | 0.4% | 23 |
| Optimizely | Less than 0.1% | 0.2% | 0.2% | 6 |
Sources: W3Techs content management overview and ranking breakdowns, 21 October 2026; Octo Agency check, 21 October 2026
WordPress runs 16% of the readable sample, a third of its top-10,000 share. Sitecore runs 20%, against 0.4% of the top 10,000. Webflow runs 4%, about twice its top-10,000 share, and HubSpot CMS under 3%, about two and a half times its top-million share.
Headless front ends and the tag stack
Twenty-seven of the 116 readable homepages render through a JavaScript front end: 15 framework builds, 10 Sitecore sites, Freshfields on Optimizely and Bounteous on Drupal with Gatsby. Sitecore's developer portal describes XM Cloud as a "cloud-hosted headless Web CMS" with a Next.js SDK, which matches what we saw: DLA Piper, Linklaters, Goodwin and Eide Bailly serve Sitecore content from Next.js.
Language versions push firms towards these platforms. Eighteen homepages declare five or more language or region versions in hreflang tags, led by WSP with 45, Hays with 40, Capgemini with 38 and Cognizant with 34. Only one of the 18, Capgemini, runs WordPress.
The marketing stack follows the platform. Adobe's tag manager loads on 18 homepages, 14 of them on Adobe Experience Manager. HubSpot scripts appear on only 11 of the 116, Marketo on 13, Pardot on five and Eloqua on three; these are floors, because scripts loaded through a tag manager do not show in the HTML. Google's tag appears on 90. A named consent tool appears on 71, OneTrust on 48 of them.
Field speed by platform in the top million
The HTTP Archive pairs Chrome's real-user data with technology detection. An origin passes when at least 75% of real visits are good on loading, responsiveness and layout stability. Treat the top-million figures as a base rate for each platform, not a professional services benchmark.
| Platform | Top 1M origins measured | Top 1M pass rate | All origins pass rate |
|---|---|---|---|
| Optimizely Content Management | 470 | 62.6% | 71.1% |
| Drupal | 11,658 | 58.6% | 64.7% |
| WordPress | 110,537 | 50.1% | 48.3% |
| Webflow | 2,635 | 49.8% | 71.3% |
| HubSpot CMS Hub | 704 | 45.2% | 60.0% |
| Liferay | 1,135 | 41.9% | 43.6% |
| Sitecore | 1,732 | 34.5% | 39.3% |
| Adobe Experience Manager | 4,542 | 33.2% | 33.9% |
| Next.js | 39,764 | 25.5% | 35.7% |
Source: HTTP Archive Core Web Vitals Technology Report, September 2026 dataset, read through the report API on 21 October 2026
The two platforms that run 39 of our 116 readable homepages, Sitecore and Adobe Experience Manager, sit near a third in the top million. WordPress and Webflow sit near half. None of these rates proves a platform causes the result: the tag stack, images and chat widgets added after launch decide most outcomes, and the Next.js figure includes logged-in web apps.
Who owns the website: the survey data
Webflow's 2026 State of the Website report, a vendor-commissioned survey run by Vanson Bourne in June and July 2025, asked 1,000 director-level leaders, 70% in marketing and 30% in technical roles, at organisations of 50 or more staff in the US, UK and Canada. Its industry list has no professional services category, so treat it as a general proxy.
| Platform type | Struggled to deliver on time | Struggled to stay on budget |
|---|---|---|
| Custom build | 60% | 66% |
| Traditional CMS | 49% | 51% |
| Headless CMS | 45% | 65% |
| Digital experience platform | 41% | 50% |
Source: Webflow, The 2026 State of the Website, collaboration chapter, survey June to July 2025
Digital experience platforms, the category Sitecore and Adobe sell in, have the best on-time figure in the survey. In the same report, 93% of marketing leaders say they are at least somewhat reliant on developers, agencies or outside expertise to change the website, and only 34% of technical leaders are completely satisfied with theirs, falling to 29% for custom builds. Read these as a vendor's framing: Webflow sells the marketer-owned model.
What this means for a Professional Services site: a five-page test order
The 122 firms show three working models: an enterprise platform run by IT, WordPress run by marketing or an agency, and a coded front end over a headless store. The counts do not tell you which fits your firm. Before committing, we would rebuild five pages on the candidate platform, in this order, and judge it on them rather than on a demo.
1. A person page. Lawyer, partner and consultant profiles are often the largest collection on a professional services site. Load real profiles with practices, offices, credentials and insights linked, and check the item and reference limits; our Webflow CMS Limits in 2026 post covers where Webflow stops.
2. A practice or service page. Time how long a marketer takes to publish a second one, with related people and insights pulled in, without a developer.
3. An insights article. Check authorship by several people, review and approval, and how the article reaches the profile pages.
4. An office or language version. If you need more than one language, test translation, hreflang and local contact details before anything else; 18 of our firms already run five or more versions.
5. The contact or consultation page. Wire the form to your CRM and test it end to end with the consent banner loaded, then measure mobile Core Web Vitals against the 34.5% to 50.1% top-million range above.
In our own work, as a white-label partner to Web Tonic, we built more than 20 Webflow sites in twelve months at two to three weeks each, and the largest CMS held over 1,200 items. We run a four-week process for marketing sites, build them in Webflow and applications in Next.js, and quote each build per project. Our marketing websites service page explains how we scope a professional services site.
