Not all stocks on the Indian stock market move with the same rhythm. Some are in constant motion with thousands of trades every hour. Others, like Balaji Telefilms, may go silent for long periods, only to come alive suddenly and briefly. These quieter stocks are classified as illiquid, and to manage their unique behavior, SEBI introduced a system called the Periodic Call Auction (PCA).
Let’s break down what this means and why a well-known company like Balaji Telefilms ends up trading under this mechanism.
Why Periodic Call Auction Exists
In a typical stock, orders are matched instantly during live trading hours. But for stocks with little activity, this continuous matching can create problems. A single trade can swing the price wildly, or a manipulator can distort the price without much resistance.
To avoid this, SEBI introduced Periodic Call Auctions — a system that batches trades at specific intervals, rather than executing them in real-time. This allows for better price discovery and prevents manipulation in low-volume stocks.
SEBI’s Criteria for Illiquid Stocks
SEBI defines a stock as illiquid if:
- The average daily turnover is less than ₹2 lakhs over the last two quarters
- It’s illiquid across all stock exchanges
However, even if a stock meets the above conditions, it is excluded from the illiquid list if:
- The average market capitalization is more than ₹10 crore
- The company has paid dividends in at least two of the last three years
- The company has been profitable in at least two of the last three years, with low promoter pledge and solid book value
How Periodic Call Auction Sessions Work
A trading day is split into multiple PCA sessions, usually at least two, where each session runs for one hour. Here’s the structure:
- 45 minutes: Order entry and modification
- 8 minutes: Order matching
- 7 minutes: Buffer time to transition
Orders that don’t get matched can roll over to the next session. But there’s no instant execution — trades happen only if buyers and sellers match during those 8 minutes.
Random closure of sessions within the 44th to 45th minute prevents last-minute manipulation.
Orders that do not find a match during the matching window are removed. There is no live order matching outside these fixed sessions.
Here are the session timings:
| Session | Time Slot |
|---|---|
| 1 | 9:30 AM to 10:30 AM |
| 2 | 10:30 AM to 11:30 AM |
| 3 | 11:30 AM to 12:30 PM |
| 4 | 12:30 PM to 1:30 PM |
| 5 | 1:30 PM to 2:30 PM |
| 6 | 2:30 PM to 3:30 PM |
What’s Happening with Balaji Telefilms
On June 16, 2025, the stock of Balaji Telefilms traded during multiple PCA sessions. Here are some session-wise trades:
- 10:30 AM – 11:30 AM: Price ₹90.11, Volume 233 shares
- 12:30 PM – 1:30 PM: Price ₹90.11, Volume 34,022 shares
- 1:30 PM – 2:30 PM: Price ₹90.56, Volume 31,277 shares
- 2:30 PM – 3:30 PM: Price ₹90.56, Volume 8,029 shares
Rather than a steady flow of trades, you see sporadic and clustered trading at fixed price levels. These sessions tell a story: the stock didn’t move for hours and then saw a large batch of trades get executed — but only during that session’s matching window.
On the chart, this appears as stiff price bars with no intermediate ticks. That’s PCA in action — it captures a group of trades at once, rather than letting prices move tick-by-tick.
So even though Balaji Telefilms is a known brand, its trading activity is thin. Low daily turnover and few trades place it under PCA — not because of the company’s business, but because of how rarely its stock changes hands.
Why Balaji Telefilms Is Classified as Illiquid
Despite being a known media company, Balaji Telefilms often lacks consistent trading activity. It has:
- Limited retail or institutional participation
- Low number of trades per day
- Thin order books, leading to wide bid-ask spreads
This qualifies it as an illiquid stock under SEBI’s norms, and it’s therefore placed under the PCA system.
Additional Protections and Penalties
SEBI’s framework also ensures:
- A 20% price band applies through the day to limit volatility
- If a client places both a buy and sell order at matching prices and it results in a trade (essentially trading with oneself), a penalty of either 1% of trade value or ₹5,000 is charged per instance
These rules add accountability and transparency in a space often vulnerable to manipulation.
Key Observations About PCA Trading
- You cannot enter and exit positions instantly. Orders are matched only during call auction windows.
- Prices appear to jump rather than move smoothly, as they’re determined at fixed intervals.
- Day traders and scalpers cannot effectively trade in these stocks.
- The system helps reduce manipulation, especially for smaller companies with low investor interest.
The Periodic Call Auction system is SEBI’s way of ensuring fairness and reducing volatility in illiquid stocks. For long-term investors, it brings transparency. For short-term traders, it may feel restrictive, but it plays an important role in protecting market integrity.
Balaji Telefilms is just one example of how a familiar stock can end up in this segment—not due to fundamentals, but due to trading behavior. If you’re investing or trading in illiquid stocks, understanding PCA is essential.
