Fees are higher than for an LLC: SAR 1,600 to incorporate and SAR 1,600 a year to confirm the CR, against SAR 1,200 for each. If you need neither shares nor investors, an LLC may be enough.
The most useful clauses (lock-up, compulsory transfer, arbitration) can only be added or changed with every shareholder's consent (Article 154). Write them in at incorporation, before any investor joins.
Converting an existing company into an SJSC needs the approval of all partners or shareholders (Article 220). A single objector can block it.
No statutory minimum does not mean any capital will do. MISA and the banks look at whether capital matches the activity and business plan, and issuing preferred shares triggers a mandatory auditor (Article 19).