How do I sell stocks that are bought using DBS Vickers cash upfront trades? What is the platform with lowest selling fee?

Yes, you can sell stocks that were bought using DBS cash upfront. However, they will be subjected to the commission charges shown here: https://www.dbs.com.sg/vickers/en/pricing/fee-s...

As for your second question, the answer can be found here: https://blog.seedly.sg/the-ultimate-cheatsheet-...

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Good luck!