Block Execution in a F&O-Banned Midcap
A domestic mutual fund client instructs your institutional desk to buy 4.8 million shares of XYZ Ltd, a midcap, before today's close. XYZ has 60 million free-float shares and trades at ₹428.5 after opening at ₹410; the exchange has a 5% daily circuit, so the upper limit is ₹430.5. The stock is on the exchange's F&O ban list because open interest in its futures is above 95% of the market-wide position limit. Average daily volume in the cash segment over the last 20 sessions is 1.1 million shares, but today only 380,000 shares have traded. The client's order is 8% of free float and 4.4 times normal ADV. Your desk's single-order limit is 500,000 shares unless approved by risk. The client refuses to disclose any unpublished information and wants best execution. Cash margins are funded, but the client cannot provide additional collateral today.
1. What is the immediate execution problem, and how would you structure the order to avoid a failed or manipulative execution?
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The order is too large for today's liquidity and is arriving with the stock only ₹2 below the 5% upper circuit. A market order would sweep visible bids, push XYZ to ₹430.5, and leave most of the 4.8 million shares unfilled. That creates execution risk and can look like an attempt to create artificial price or volume.
Structure it as an agency POV/VWAP order capped at 10-15% of traded volume, using limited orders below the circuit and multiple brokers if approved. Do not cross the circuit or post a large visible bid. Seek risk approval for the first 500,000 shares and pre-arrange a block deal for the balance in the next block window if the client can accept a one-day delay. If the client insists on same-day completion, execute only what can be filled within the risk limit and document that the residual was declined. The key judgement is that best execution does not mean guaranteeing full size at any price.
2. Which regulatory and risk controls are triggered, and what would you do about the F&O ban?
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The F&O ban restricts new positions in XYZ futures and options, not cash-market purchases. That matters because the desk cannot hedge a pre-bought cash position with single-stock derivatives; any inventory taken before the client allocation carries unhedged price risk. The 5% circuit caps the maximum price at ₹430.5 and may lock the stock, so fills are not assured. The single-order limit of 500,000 shares is a hard control unless risk approves an exception. Cash margins must be funded upfront, and the client cannot add collateral today, so the desk should not assume extra intraday exposure. Block deals have separate window, size and disclosure requirements. Because the client says there is no unpublished information, still confirm this in writing and keep the order confidential. The practical response is to allow cash buying within approved limits, avoid proprietary pre-positioning, and escalate any request to exceed limits.
3. The client insists on completing the full quantity today. Draft your response and the fallback plan.
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Response: 'We can execute up to 500,000 shares today within our approved single-order limit using a volume-capped algo. Completing 4.8 million shares today would require crossing the 5% circuit and breaching our risk limit; we will not do that. We can seek same-day risk approval for an additional tranche, but we cannot guarantee a full fill because today's volume is only 380,000 shares and the stock is near the upper circuit.'
Fallback: execute the approved tranche today, then arrange a negotiated block or multi-day VWAP for the remainder. If the client needs certainty, offer a block at a disclosed price to institutional sellers, subject to the block window and settlement. Document the client's instruction, the liquidity constraint, the limit breach refusal, and the alternative offered. Do not use the client's order information for proprietary trading.