HomeNewsBusinessMarketsInside the stock market’s VIP lounge: How Sebi plans to stop the gatecrashers

Inside the stock market’s VIP lounge: How Sebi plans to stop the gatecrashers

Block deals promise quiet, high-stakes trades - but leaks, opportunists, and Bollywood-villain tactics have turned them into a circus. Sebi's new move could rewrite the script.

August 12, 2025 / 15:40 IST
Story continues below Advertisement
When there’s a known seller, there's often an overhang on the stock—buyers retreat, prices stagnate. If that seller dumps shares in the open market, prices crash, hurting both retail and institutional investors.
When there’s a known seller, there's often an overhang on the stock—buyers retreat, prices stagnate. If that seller dumps shares in the open market, prices crash, hurting both retail and institutional investors.

If the regulated stock market is a bustling bazaar, the block deal window is the swanky VIP lounge. Here, massive trades happen away from the noise. But lately? The script’s gone off-plot.

Let’s rewind. FY24 saw a record number of block deals, with promoters and private equity funds offloading stock like there was no tomorrow, and mutual funds - flush with fund flows - were eager buyers. But in any market, if a buyer knows a seller is desperate, it’s only natural to negotiate hard. Read More

Story continues below Advertisement

Here’s the catch: block deals must be executed within a ±1 percent price band of the previous day’s close. This deal window, open twice a day, is only for the two parties - the buyer and the seller - to execute their negotiated transaction within the prescribed price band through their broker’s terminals. So, if you’re trying to negotiate a meaty 5 percent discount, you can’t execute it on the exchange’s block deal window. What happens instead is a series of rapid phone calls between the buyer, seller, and brokers, negotiating over percentages until they agree. Then, during regular trading hours, the brokers from both sides hit 'execute' at a pre-decided time. That’s when things can get murky.

Sometimes, deal info leaks. Mystery bidders swoop in, offer a slightly better price, and steal the deal. The original buyer? Left in the lurch. In more notorious cases, portfolio managers running PMS or AIFs buy block deals in their personal accounts - often based on leaked details - and then flip the stock back to their own funds at a smaller discount (or even a higher price) once prices recover, pocketing the spread. It's like playing both sides of the trade - Bollywood villain style.
Mutual funds, expected to protect the retail investor, often end up not getting their well-deserved (well-negotiated) meat. Before, they get the stuff, someone else has paid pennies more and wiped the trading window clear.