Depends heavily on the instrument: real stock ownership is generally permissible when screened; options, futures, margin, and short-selling are generally not.
Confidence level: Strong on options/derivatives and margin/short-selling as majority-impermissible. Genuinely more debated on short-term/day trading of real shares — see Madhab Views below.
WHY THE PLATFORM ISN'T THE ISSUE
Robinhood, Webull, and similar U.S. brokerage apps are simply neutral marketplaces — they don't make what you trade halal or haram any more than a bank makes an account halal or haram. The ruling depends entirely on the financial instrument you're buying and selling through the app, so this question really breaks into several separate rulings.
BUYING AND SELLING REAL SHARES (CASH ACCOUNT, NO MARGIN)
When you buy actual shares of a Shariah-screened company — meaning you take real, direct ownership of a fractional stake in that business, pay for it in full with your own cash, and can sell it whenever you choose — this is a genuine sale-and-purchase (bay') transaction. Most scholars hold that this remains permissible even if you sell the same day, because what determines permissibility is the underlying business and the reality of ownership transfer, not how long you hold the position. The company itself must still pass standard Shariah screening on business activity and financial ratios (debt, interest income, impermissible revenue under roughly 5%).
Some scholars express discomfort specifically with very short-term, high-frequency trading aimed purely at price speculation with no genuine investment intent, viewing it as functionally closer to gambling even when the underlying stock is halal. This is a minority caution rather than a majority prohibition — see Madhab Views for the range of positions.
OPTIONS CONTRACTS
Options (calls and puts) are generally viewed as impermissible by the majority of contemporary scholars and fatwa bodies, including positions associated with the OIC Fiqh Academy. The core problems: an option is a right to buy or sell at a future price, not an asset itself — you are trading a contract about a possible future transaction, not transferring real ownership of anything at the point of sale. This involves significant gharar (uncertainty about whether the right will ever be exercised) and closely resembles maysir (gambling), since one party's gain is structured as the other party's loss based on price movement within a fixed window, with no productive economic activity underlying the exchange. Selling ("writing") options compounds this further, since you may be obligating yourself to a transaction involving an asset you don't own (in the case of naked calls) or committing capital you don't have available (in the case of cash-secured puts used speculatively).
FUTURES CONTRACTS
Futures carry similar concerns to options — you're trading a standardized contract for a future transaction rather than a real asset, typically with high leverage and no intention by most retail traders of ever taking physical delivery. This is generally treated the same way as options by most contemporary scholars.
MARGIN TRADING (BUYING ON BORROWED MONEY)
Margin accounts let you borrow money from the brokerage to buy more securities than your cash balance allows. This borrowed amount typically carries an explicit interest charge, which is riba regardless of what you use the borrowed funds to purchase — even genuinely halal, well-screened stocks. Buying real shares with your own cash and buying the same shares on margin are not the same transaction from a Shariah standpoint; the margin interest taints the second one.
SHORT SELLING
Short selling involves selling a security you don't currently own (borrowed from the broker) with the intention of buying it back later at a lower price. This raises a distinct classical objection: you cannot sell what you do not own (bay' ma la yamluk), a prohibition with direct hadith support. Most contemporary scholars treat conventional short selling as impermissible for this reason, separate from any gharar concern.
WHAT TO DO IF YOU'RE CURRENTLY TRADING THIS WAY
If you hold only real, Shariah-screened shares in a cash account: no change needed on the instrument itself, though consider whether your trading frequency reflects genuine investment or pure speculation.
If you're trading options, futures, or on margin: stop opening new positions. Close existing positions in an orderly way rather than abruptly, since a chaotic unwind can create unnecessary financial harm. Move to a cash account and screen your holdings going forward.
If you've been short selling: unwind the position and return to purchasing real, owned shares only.
WHAT COULD CHANGE THIS ANSWER
— The "option" in question is actually a genuine Islamic alternative structure (e.g., a Salam or Arbun contract with real delivery intent), which is a different instrument from a conventional exchange-listed option despite surface similarity — A specific scholar identifies a narrow permissible use of a derivative for genuine hedging necessity in a business context, which is a different context from individual retail speculation — The underlying company fails or passes Shariah screening, which changes whether even a real-share cash purchase is appropriate
This describes the general, majority-held rulings on these instrument types. It is not a personal fatwa or trading advice. For your specific portfolio, account structure, or an unwind strategy, consult a qualified scholar and, separately, a licensed financial advisor.