Whether a company in Saudi Arabia needs an audit depends on its legal form and the rules that apply to it, and banks, investors and the tax authority may ask for audited statements in any case. For a foreign-owned company, the audit also has to satisfy the parent group, which may want the work done to its own timetable and reporting standards.
Several of the listed audit firms declare a licence from the Saudi Organization for Chartered and Professional Accountants (SOCPA). Ask for the licence number of the partner who will sign, check it, and ask how the firm stays independent if it also keeps your books. Ask which standards it audits under, when it needs the trial balance, and whether it can coordinate with your group auditor abroad. A quote should state the fee, the timetable and what is excluded.
Accountanty lists 61 firms offering audit in Saudi Arabia: 39 accounting firms and 22 corporate service providers, of which 34 are small, 23 medium-sized and four part of large networks. Thirty-six focus on foreign clients, and English is offered by 49 and Arabic by 40. See Riyadh, Jeddah, Dammam and Al Khobar, and the Saudi Arabia guide.
General information, not legal or tax advice. Rules, rates and fees change: check them with the official sources linked on this page or with a qualified adviser before you act.