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12.12

Measuring liquidity of equity shares

Liquidity of equity shares measures how quickly and at what cost a share can be bought or sold in the market. The NISM exam tests your ability to identify, compute and interpret key liquidity metrics. Mastery of these concepts helps you evaluate stock tradability and meet SEBI expectations.

Learning Objectives

  • 1Define liquidity and its relevance for equity research analysts.
  • 2Identify the three primary liquidity measures used in the Indian market.
  • 3Apply the standard formulas for Bid‑Ask Spread, Turnover Ratio and Days to Liquidate.
  • 4Interpret liquidity figures in the context of exam questions and real‑world analysis.

Liquidity – Definition and Exam Importance

Liquidity refers to the ease with which an equity share can be converted into cash without causing a material change in its price. In the Indian equity market, high liquidity implies tight bid‑ask spreads, high trading volumes and the ability to execute large orders swiftly.

The NISM Series XV exam frequently asks candidates to compute liquidity ratios, compare stocks on a liquidity basis, and explain why liquidity matters for risk assessment. Understanding liquidity also aligns with SEBI’s emphasis on market efficiency and investor protection.

When you answer liquidity‑related questions, remember to focus on the numeric definition of each metric, the correct denominator (e.g., total outstanding shares), and the time‑frame specified in the question.

⚠️Common Trap

Do not confuse high liquidity with high profitability. A stock can be very liquid yet deliver poor returns. The exam tests liquidity metrics independently of earnings or valuation.

Primary Liquidity Measures

The NISM syllabus highlights three quantitative measures for equity liquidity: Bid‑Ask Spread, Turnover Ratio and Days to Liquidate. Each captures a different market dimension – price impact, trading activity and the time needed to unwind a position.

Bid‑Ask Spread reflects the transaction cost for an immediate trade. Turnover Ratio shows the proportion of a company’s share capital that changes hands over a period, usually a month. Days to Liquidate estimates how many trading days are required to sell the entire free‑float at the average daily volume.

Exam questions may present any of these metrics alone or ask you to rank stocks based on a combination of them. Knowing the exact formula and the variables involved is essential for scoring marks.

Bid‑Ask Spread

The Bid‑Ask Spread is the difference between the lowest price a seller is willing to accept (Ask) and the highest price a buyer is willing to pay (Bid). A narrow spread indicates a liquid market, while a wide spread signals thin trading.

For exam calculations, the spread is expressed as a percentage of the midpoint price, which is the average of Ask and Bid. Using the midpoint neutralises the effect of absolute price levels and allows comparison across high‑price and low‑price stocks.

Remember: the spread percentage is not the same as the absolute rupee difference. The exam will often give Ask and Bid values and ask for the spread in percent.

∑Formula: Bid‑Ask Spread (%)
(Ask−Bid)(Ask+Bid)/2×100\frac{(Ask - Bid)}{(Ask + Bid) / 2} \times 100

Where:

Ask= Ask price in rupees
Bid= Bid price in rupees
(Ask + Bid) / 2= Midpoint price in rupees

Worked Example

Given Ask = 105, Bid = 100: Step 1: Midpoint = (105 + 100) / 2 = 102.5 Step 2: Spread % = ((105 - 100) / 102.5) × 100 = (5 / 102.5) × 100 = 4.878% Verification: ((105 - 100) / ((105 + 100) / 2)) × 100 = 4.878%.

ℹ️Exam Tip

Always use the midpoint price in the denominator. Substituting the last traded price instead of the midpoint leads to a higher spread figure and loss of marks.

Turnover Ratio

Turnover Ratio measures the intensity of trading activity relative to the total share capital. It is calculated for a specific period, commonly a month, and expressed as a percentage.

A high turnover ratio (e.g., above 30%) signals that a large portion of the share pool is being bought and sold daily, which enhances liquidity. Conversely, a low ratio indicates limited market participation.

In NISM questions, the denominator is always the total number of shares outstanding (including promoter holdings unless otherwise stated). The numerator is the total number of shares traded during the chosen period.

∑Formula: Turnover Ratio (%)
Shares_TradedOutstanding_Shares×100\frac{Shares\_Traded}{Outstanding\_Shares} \times 100

Where:

Shares_Traded= Number of shares traded in the period
Outstanding_Shares= Total shares issued and outstanding

Worked Example

Shares traded in a month = 2,000,000; Outstanding shares = 10,000,000: Turnover Ratio = (2,000,000 / 10,000,000) × 100 = 20% Verification: (2,000,000 / 10,000,000) × 100 = 20%.

Days to Liquidate

Days to Liquidate estimates how many trading days are needed to sell the entire free‑float of a stock at its average daily volume. It is a practical measure of market depth.

The formula divides total outstanding shares by the average daily traded volume. A lower number of days indicates higher liquidity because the market can absorb larger orders quickly.

Exam setters may provide either the average daily volume directly or the total monthly volume, requiring you to first compute the daily average (monthly volume ÷ number of trading days, typically 22).

∑Formula: Days to Liquidate
Outstanding_SharesAverage_Daily_Volume\frac{Outstanding\_Shares}{Average\_Daily\_Volume}

Where:

Outstanding_Shares= Total shares issued and outstanding
Average_Daily_Volume= Average number of shares traded per trading day

Worked Example

Outstanding shares = 10,000,000; Average daily volume = 500,000: Days to Liquidate = 10,000,000 / 500,000 = 20 days Verification: 10,000,000 / 500,000 = 20.

Comparison of Core Liquidity Measures for Equity Shares

Liquidity MeasureDefinitionFormula (Exam)Typical Exam Focus
Bid‑Ask SpreadCost of an immediate trade expressed as a percent of the midpoint price.(Ask‑Bid)/(Ask+Bid)×2 ×100Compute % spread; identify narrow vs wide spreads.
Turnover RatioShare‑turnover intensity over a period (usually a month).Shares Traded ÷ Outstanding Shares ×100Interpret high (>30%) vs low (<10%) ratios.
Days to LiquidateTime required to sell the entire free‑float at average daily volume.Outstanding Shares ÷ Avg Daily VolumeAssess market depth; lower days = higher liquidity.

Worked Example – Indian Stock XYZ

Example: Liquidity Calculations for XYZ Ltd.

Scenario

XYZ Ltd. has 5,000,000 shares outstanding. The average daily volume over the last month is 250,000 shares. The current Ask price is ₹210 and the Bid price is ₹208. The month consists of 22 trading days.

Solution

1. Midpoint = (210 + 208) / 2 = 209.\n2. Bid‑Ask Spread % = ((210‑208) / 209) × 100 = (2 / 209) × 100 = 0.957% (≈0.96%).\n3. Total shares traded in the month = 250,000 × 22 = 5,500,000.\n4. Turnover Ratio % = (5,500,000 / 5,000,000) × 100 = 110%.\n5. Days to Liquidate = 5,000,000 / 250,000 = 20 days.

Conclusion

XYZ shows an extremely high turnover ratio, indicating very active trading, while its spread of under 1% reflects low transaction cost. The 20‑day liquidation period is moderate, signalling decent market depth.

Turnover Ratio Comparison of Selected Indian Stocks (Monthly)

SEBI & NISM View and Exam Tips

SEBI does not prescribe a fixed liquidity threshold, but it expects listed companies to maintain adequate market depth to protect investors. The regulator monitors illiquid stocks for potential manipulation and may impose additional disclosure requirements.

The NISM syllabus therefore stresses the ability to compute and interpret liquidity metrics rather than memorising any regulatory cut‑off. In the exam, you will be asked to calculate these metrics, compare stocks, or explain why a low‑liquidity stock may carry higher price‑risk.

Memory aid: "B‑T‑D" – Bid‑Ask spread, Turnover ratio, Days to liquidate. Remember the order of formulas and the required denominators (midpoint, outstanding shares, average daily volume).

⭐Exam Takeaways

  • Liquidity measures the ease of converting shares to cash without price distortion.
  • Bid‑Ask Spread % = ((Ask‑Bid) / Midpoint) × 100; use the midpoint as denominator.
  • Turnover Ratio % = (Shares Traded ÷ Outstanding Shares) × 100; period is usually a month.
  • Days to Liquidate = Outstanding Shares ÷ Average Daily Volume; lower days = higher depth.
  • SEBI expects sufficient liquidity but does not set a numeric threshold; NISM tests calculation ability.
  • Common mistake: mixing absolute rupee spread with percentage spread – always convert to %.
  • Use the mnemonic B‑T‑D to recall the three core metrics for quick revision.

Practice Questions

8 questions on Measuring liquidity of equity shares

1

Liquidity refers to the ease with which an equity share can be converted into cash without causing a material change in its price. Which statement best captures this definition?

2

Which three quantitative measures are identified in the NISM syllabus for assessing equity liquidity in the Indian market?

3

A stock has an Ask price of ₹120 and a Bid price of ₹115. What is the Bid‑Ask Spread expressed as a percentage of the midpoint price?

4

During a month, 3,000,000 shares of a company are traded. The company has 15,000,000 shares outstanding. What is the Turnover Ratio for the month?

5

A stock has 8,000,000 shares outstanding. Its total volume for the last month was 1,600,000 shares and the month had 20 trading days. How many trading days are required to liquidate the entire free‑float at the average daily volume?

6

Stock A: Ask ₹102, Bid ₹100, Turnover Ratio 15%. Stock B: Ask ₹150, Bid ₹148, Turnover Ratio 35%. Which stock is overall more liquid?

7

Which of the following is a common trap when answering liquidity‑related questions in the NISM exam?

8

For a company with 12,000,000 outstanding shares, 2,400,000 shares traded in a month, and an average daily volume of 300,000 shares, which statement best reflects the liquidity indicated by the computed metrics?

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