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William Buck

Mid-tierWebsite
4 Current Clients

About William Buck

William Buck is an independent mid-tier accounting and advisory firm serving businesses, families, and individuals. With a presence in both New Zealand and Australia, the firm provides audit, tax, and business advisory services with a focus on building long-term client relationships.

Current Clients (4)

Being AI
BAIHealthcare
Last verified: 4/10/2026
Promisia Healthcare Limited
PHLHealthcare
Last verified: 4/10/2026
RTO Limited
RTOInformation Technology
Last verified: 4/10/2026
Cooks Coffee Company Limited
CCCConsumer Staples
Last verified: 11/26/2025

Former Clients (1)

Black Pearl Group Limited
BPGInformation Technology

Switching History (6)

William Buck → Grant Thornton
3 May 2026
13 Oct 2025
Departed: William Buck Audit (NZ) Limited
29 Jul 2025
BDO → William Buck
31 Jan 2020
William Buck Audit (NZ) Limited → PwC
2 Apr 2019
Moore Stephens Wellington Audit → William Buck Audit (NZ) Limited
Ill health of the only Wellington based audit partner
28 Mar 2019

Common questions

Sourced from public NZX filings, our database, and questions people ask about William Buck.

What is William Buck's experience with NZX-listed companies?

According to our records, William Buck currently provides audit services to 4 NZX-listed companies across sectors including Information Technology, Consumer Staples, Healthcare, and Real Estate. Their current NZX clients include RTO Limited, Cooks Coffee Company Limited, Being AI, and Promisia Healthcare Limited. You can view William Buck's full NZX deal history and client relationships on NZXplorer.

What sectors does William Buck audit in New Zealand?

Based on our data, William Buck covers audit and advisory work across Information Technology, Consumer Staples, Healthcare, and Real Estate sectors. The firm's sector experience is reflected in their current portfolio of NZX-listed clients operating in these industries.

Where is William Buck located in New Zealand?

William Buck operates as an independent mid-tier firm with a presence in both New Zealand and Australia. For current office locations and contact details, you can visit their website at williambuck.com or contact them directly for information about their Auckland, Tauranga, and other New Zealand offices.

What services does William Buck provide?

William Buck is an independent accounting and advisory firm offering audit, tax, and business advisory services to businesses, families, and individuals. The firm focuses on building long-term client relationships across both private and listed company sectors.

Is William Buck a Big 4 accounting firm?

No, according to our records, William Buck is classified as a mid-tier independent accounting and advisory firm, not a Big 4 firm. The Big 4 accounting firms globally are Deloitte, PwC, EY, and KPMG; William Buck operates independently in the New Zealand and Australian markets.

How many NZX clients has William Buck worked with?

According to our data as of the latest update, William Buck has worked with 5 NZX companies in total, with 4 current NZX-listed clients. You can explore the full history of their NZX relationships and audit roles on NZXplorer's firm profile pages.

What is the role of an external auditor in New Zealand?

An external auditor in New Zealand provides independent assurance that a company's financial statements are accurate and comply with applicable accounting standards and the Companies Act. For NZX-listed companies, an external auditor is a mandatory requirement and provides oversight that protects investors and stakeholders.

Can I find William Buck's careers opportunities in New Zealand?

For information about William Buck's current vacancies and graduate opportunities in New Zealand, you can visit their careers page on williambuck.com or contact their human resources team directly through their website.