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AI Visibility Index · September 2026

Accountants in Basel that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for accountants in Basel, three times each, in German, and counted who they named. These are the businesses named in two or more of the 36 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Accountants · Basel
94%of answers named BDO
Answers
36
Businesses named
32
Named only once
9
Named by 2+ assistants
9 of 23
Named again on a rerun
55%

Edition September 2026. Download the data

Asked for accountants in Basel, ChatGPT, Claude and Gemini most often named BDO (94% of answers), OBT (58%) and TRETOR (42%). Across 36 answers they named 32 different businesses, 9 of them only once. Each of four buyer questions was asked three times, in German, in September 2026.

The ranking

The AI Recommendation Rate is the fraction of the 36 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Accountants in Basel named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1BDOAlso written BDO AG Basel, BDO AG, Basel, BDO AG, BDO AG – BaselIs this your business?94%95%: 82 to 99%83%100%100%4 of 42
2OBTAlso written OBT AG Basel, OBT AG, Basel, OBT AG, OBT AG – BaselIs this your business?58%95%: 42 to 73%83%75%17%4 of 42
3TRETORAlso written TRETOR AG, TRETOR AG, BaselIs this your business?42%95%: 27 to 58%58%67%0%4 of 43.1
4PwCAlso written PwC Schweiz, PricewaterhouseCoopers AG Basel, PwC Schweiz, Basel, PwC Basel, PWC Schweiz, BaselIs this your business?31%95%: 18 to 47%17%17%58%3 of 42.5
5Buchhaltungs- und Treuhand AG BaselIs this your business?17%95%: 8 to 32%33%17%0%2 of 41
6Treuhand- und Revisionsgesellschaft Mattig-Suter und PartnerIs this your business?17%95%: 8 to 32%0%0%50%3 of 43.2
7KPMGAlso written KPMG AG, KPMG AG Basel, KPMG AG, Basel, KPMG Schweiz, BaselIs this your business?17%95%: 8 to 32%8%8%33%2 of 43.7
8Wullschleger Treuhand AGIs this your business?17%95%: 8 to 32%0%0%50%2 of 43.8
9Treuhand Basel AGIs this your business?14%95%: 6 to 29%0%0%42%2 of 43
10Fiducia TreuhandAlso written Fiducia Treuhand AG Basel, Fiducia Treuhand AG, Fiducia Treuhand AG, BaselIs this your business?14%95%: 6 to 29%0%0%42%4 of 44.4
11Copartner Revision AGIs this your business?11%95%: 4 to 25%0%33%0%3 of 42.5
12Balmer-EtienneAlso written Balmer-Etienne AG, Basel, Balmer-Etienne AG, Balmer-Etienne AG BaselIs this your business?11%95%: 4 to 25%25%8%0%2 of 43
13Gfeller & PartnerAlso written Gfeller + Partner AG, Gfeller & Partner AG, Gfeller & Partner AG, BaselIs this your business?11%95%: 4 to 25%0%0%33%4 of 44.8
14BANDO TREUHAND AGIs this your business?8%95%: 3 to 22%8%17%0%3 of 42.3
15RST Treuhand AGIs this your business?8%95%: 3 to 22%0%25%0%2 of 43.7
16Fineac Treuhand AGIs this your business?6%95%: 2 to 18%0%0%17%1 of 43
17thvAlso written thv AG – Basel, thv AG Treuhand und RevisionIs this your business?6%95%: 2 to 18%17%0%0%2 of 43
18DeloitteAlso written Deloitte AG, BaselIs this your business?6%95%: 2 to 18%8%0%8%1 of 43.5
19KENDRIS AG BaselIs this your business?6%95%: 2 to 18%17%0%0%1 of 43.5
20Pestalozzi Rechtsanwälte AG, BaselIs this your business?6%95%: 2 to 18%0%17%0%2 of 43.5
21Ammann Treuhand AGIs this your business?6%95%: 2 to 18%0%0%17%1 of 44.5
22A&O Treuhand AGIs this your business?6%95%: 2 to 18%0%0%17%1 of 45
23Wullschleger & Partner AGIs this your business?6%95%: 2 to 18%0%0%17%1 of 45.5

Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 9 more names came up in a single answer and are counted above but not listed.

Is this your business?

See what the assistants say about your business today. The free checker asks ChatGPT, Claude, Gemini and Grok two of the Index questions for this category, with the category and the place already filled in, and shows every answer word for word. About 30 seconds, no sign-up.

Check your businessNamed above? Add the badgeWhat the audit does

What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#ChatGPTClaudeGemini
1BDO83%BDO100%BDO100%
2OBT83%OBT75%PwC58%
3TRETOR58%TRETOR67%Treuhand- und Revisionsgesellschaft Mattig-Suter und Partner50%
4Buchhaltungs- und Treuhand AG Basel33%Copartner Revision AG33%Wullschleger Treuhand AG50%
5Balmer-Etienne25%RST Treuhand AG25%Treuhand Basel AG42%

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing
Named by AI assistants: Accountants in Basel, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/accountants/basel"><img src="https://aigrow.gg/badges/index/2026-09/accountants/basel.svg" width="312" height="100" alt="Named by AI assistants: Accountants in Basel, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant, in German. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

  1. 1Wer ist der beste Treuhänder in Basel?Who is the best accountant in Basel?
  2. 2Ich habe ein kleines Unternehmen in Basel. Welches Treuhandbüro empfiehlst du?I run a small business in Basel. Which accounting firm would you recommend?
  3. 3Ich brauche in Basel einen Treuhänder für meine Steuererklärung. Wen würdest du empfehlen?I need someone to do my taxes in Basel. Which CPA should I use?
  4. 4Welches Buchhaltungsbüro in Basel würdest du einem kleinen Unternehmen empfehlen?Which bookkeeping service in Basel would you recommend for a small company?

How to read this page

The full method
What it measures
Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter
36 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings
Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong
If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Where the assistants look

The sites read most often, with web search on, before the assistants answer about this category in Switzerland. From the AI Source Map: 7 answers.

See every site for this category
wikipedia.org
Read in 86% of the answers
bdo.ch
Read in 57% of the answers
localsearch.ch
Read in 57% of the answers

Elsewhere in the Index

Accountants elsewhere
BernGenevaLausanneLuganoZurichBerlin
Also in Basel
DentistsLawyersPlumbersGymsReal estate agenciesRestaurants

Is your business on this list?

The free scan asks the same assistants the questions your customers ask, scores whether they name you, and lists who they name instead.

Run the free AI scanRead the method

Edition September 2026 · published by Guglielmo Paesano, founder of AIGROW · data under CC BY 4.0