Choosing a Singapore Broker: CDP-Linked vs Nominee Custody Models

Beansprout's August 2026 comparison of Singapore brokerages segments the retail stack by execution venue, custody model, and market access — no single platform clears all asset classes at acceptable cost, the review finds.

Custody split: CDP-linked vs nominee

Two architectures define the field. The CDP-linked model — Moomoo's CDP-linked account and DBS Vickers Cash Upfront — places Singapore shares directly in the investor's Central Depository position. Shares survive broker failure and remain transferable across brokers. Custodian models (Longbridge, Tiger Brokers, Webull, Interactive Brokers, IG Markets) hold assets under the broker's nominee. Onboarding is lighter, fractional shares are standard, but custody risk sits with the broker, not the depository. For pure SGX execution, CDP-linked wins on recoverability. For US equities and ETFs, the nominee model is the de facto standard — IG, Interactive Brokers, and Webull all run nominee structures, with FX spread embedded in the conversion layer rather than the order ticket.

Cost surface: commissions, FX, RSP plumbing

Fee differentials cluster around three vectors: commission per lot, USD conversion spread, and platform or regulatory add-ons. Longbridge sits at the low end for Singapore equities. Webull for US stocks and options. Interactive Brokers compresses per-share cost for active traders but carries heavier platform overhead. RSP mechanics diverge by design. FSMOne retains granular DCA control for Singapore-listed ETFs and equities; Webull's Dynamic Regular Savings Plan extends scheduled execution to US-listed names. FSMOne routes through a fixed batch window; Webull fires against live market orders. Same end-state, different execution pipelines.

CPF/SRS: limited order book

CPF-OA and SRS-funded allocations exclude most newer entrants. POEMS and FSMOne retain the relevant integrations. Brokers without explicit CPF/SRS rails cannot accept those transfers — a hard limitation, not a feature gap. Investors running CPF or SRS money have a narrower field to evaluate; each candidate requires direct verification of supported fund types, minimums, and settlement timing before account opening.

Verdict before funding

Confirm custody model and nominee status for SGX positions. Pull the full commission schedule — exchange, clearing, platform, inactivity. Test the RSP execution window against intended DCA timing. Verify CPF/SRS support if applicable. Check fractional-share mechanics: synthetic division strips corporate-action eligibility; real-share pooling preserves it.

System stability verdict: fragmented. Match the platform to the asset class, not the other way round.