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How to invest in Nifty Midcap 150 index fund? - Riding India's Growth Story with Mid-Sized Companies

21 Sept 2025 | 9 minutes read
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The NIFTY Midcap 150 Index is made up of 150 medium-sized companies from the stock market based on full market capitalization. These midcap companies can belong to different sectors like banking, IT, pharma, auto, consumer goods, and more. 

Now, as an investor, you cannot directly “buy” the index. But what you can buy instead is an “index fund”.

A NIFTY Midcap 150 index fund invests in the same 150 companies that are part of the NIFTY Midcap 150 Index. Its fund manager does not actively pick and choose stocks. Instead, they invest in the same proportion (weightage) as the index.

In this way, by investing in a NIFTY Midcap 150 index fund, you can indirectly invest in all 150 companies that form part of the index.

Want to learn more? In this article, we will first understand how the weights of companies are decided in the NIFTY Midcap 150 index fund and what free-float market capitalization means. Then, we will understand the Tata Nifty Midcap 150 Index Fund in detail and learn the simple steps to invest in it.

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How is the Weight of Each Company Decided in the Nifty Midcap 150 Index?

To decide which companies go into this index, NSE looks at the “NIFTY 500 Index”. The NIFTY 500 covers the 500 largest companies in India by market size. The top 100 companies (the biggest ones) form the NIFTY 100 Index. The next set, ranked 101 to 250 by size, forms the NIFTY Midcap 150 Index.

However, once the 150 companies are chosen, the weight of each company inside the index is not based on the full market captalisation. Instead, it is based on “free-float market capitalisation”. Let’s understand in detail:

What is Free-Float Market Capitalisation and its Role in Deciding Weightage?

Free-float market cap means the value of shares that are actually available for trading in the market. It excludes shares held by promoters and the government.

Be aware that this number is used to decide how much weight the company gets in the index. As a result, in the NIFTY Midcap 150 Index:

  • Companies with a larger free-float market cap will carry more weight and
  • Their price movements will have a bigger impact on the index compared to companies with a smaller free-float.

For more clarity, let’s study an example. Say there are only two companies included in the NIFTY Midcap 150 Index with the following details:

ParticularsCompany ACompany B
A) Share Price₹100₹200
B) Total Shares 10 lakhs5 lakh
C) Promoter Holding40%20%
D) Free-float Holding [B x (100- C)]6 lakhs [10 lakhs x (100-40%)]4 lakhs [5 lakhs x (100-20%)]
E) Free-float Market Capitalisation [A x D]₹6 crore₹8 crore

You can observe that the free-float market capitalisation of both companies is different. Now, the index will assign a weight based on it. Firstly, the total free-float will be calculated as follows:

  • ₹6 crore (Company A) + ₹8 crore (Company B) = ₹14 crore
Weight of Company AWeight of Company B
₹6 crore/ ₹14 crore = 42.9%₹8 crore/ ₹14 crore = 57.1%

Since Company B has a larger free-float market cap, changes in its share price will have more impact on the performance of the index fund.

What is the Tata Nifty Midcap 150 Index Fund?

Tata Nifty Midcap 150 Index Fund

The Tata Nifty Midcap 150 index fund is an open-ended fund replicating/tracking the Nifty Midcap 150 Index. This fund invests in the same 150 mid-sized companies in similar proportions/weights as the index subject to tracking error.

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150 Midcap Companies, One Index Fund: A Look at Tata Nifty Midcap 150 Index Fund

For a better understanding, let’s check out some key features of the Tata Nifty Midcap 150 index fund:

FeatureExplanation
Risk Level
  • Very High Risk
Constituents Selection
  • The fund invests in companies ranked 101 to 250 by full market capitalization from the NIFTY 500 list. 
  • These are medium-sized businesses.
Weighting Methodology
  • Companies with a larger free-float market cap get a higher share in the fund.
Rebalancing Frequency
  • The list of companies and their weights is reviewed and updated twice a year (March and September). Source: NiftyIndices.com
Midcap Exposure
  • The Tata Nifty Midcap 150 index fund gives you access to mid-sized companies.
  • They have more growth potential than large caps.
  • Also, they are less risky than small caps.
Sector Diversification
  • Money is spread across many industries, like: 
    • Financials
    • Consumer goods
    • Healthcare
    • Information technology (IT)
  • This leads to diversification and reduces risk.
Minimum Investment
  • You can start with a lump sum of ₹5,000 or a SIP with just ₹100 per month.

Tata Nifty Midcap 150 Index Fund is Available in 4 Options
This Nifty Mid Cap Index Fund is available in four different options:

  • Direct Growth Plan
    • You invest directly with Tata Mutual Fund without any distributor. 
    • Profits get added back to your investment (growth).
    • There are no payouts in between.
       
  • Regular Growth Plan
    • You invest through a distributor or advisor. 
    • Again, profits are reinvested and not paid out.
       
  • Regular IDCW (Income Distribution cum Capital Withdrawal)
    • You invest through a distributor.
    • You get payouts (like dividends) from the fund if declared by fund.
       
  • Direct IDCW
    • You invest directly, without distributor commission. 
    • You get payouts from the fund if declared by fund.

Tata Nifty Midcap 150 index fund (An open-ended fund replicating/tracking the Nifty Midcap 150 Index (TRI))

Tata Nifty Midcap 150 Index Fund

How to invest in the NIFTY Midcap 150 Index Fund?

When you invest in the Tata Nifty Midcap 150 index fund, you are allotted units. The value of each unit is called the NAV (Net Asset Value), which is declared at the end of each trading day.

You can invest through a lump sum or SIP (Systematic Investment Plan), without even needing a demat account. Let’s see how:

  • Step 1: Visit the official webpage here.
  • Step 2: Select the option you want to invest in (Direct Growth, Regular Growth, IDCW, etc.).
  • Step 3: Click on “Start Investing” to begin the process.
  • Step 4: You’ll be redirected to the “Quick Invest” page, where you need to enter your PAN card number.
  • Step 5: Proceed further and complete the required details (personal, bank, KYC) to finish the investment.

Conclusion

The NIFTY Midcap 150 Index represents 150 medium-sized companies in India. These are ranked 101 to 250 by size from the NIFTY 500 list. However, the NIFTY Midcap 150 Index is just a calculation showing how a group of 150 mid-sized companies is performing. It is not a security you can purchase. 

To actually invest, you need a financial product that mimics the index. That is where “index funds” come in. The Tata Nifty Midcap 150 index fund invests in these 150 mid-cap companies in the same proportion as the index. This can offer you diversification across sectors and exposure to India’s midcap growth potential.

For more information, you can visit www.tatamutualfund.com. The Investor Service Centre of Tata Asset Management Pvt. Ltd. is located at Mulla House, Ground Floor, 51, M.G. Road, Near Flora Fountain, Mumbai – 400 001, Maharashtra. The office hours are Monday to Friday, 9:00 AM to 5:30 PM, and Monday to Saturday, 9:00 AM to 5:30 PM. For assistance, you can also call (022) 6282 7777 or email service@tataamc.com.

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Disclaimer: The views mentioned above are for information & educational purposes only and do not construe to be any investment, legal or taxation advice. Investors must do their own research before investing. The views expressed in this article are personal in nature and in is no way trying to predict the markets or to time them. Any action taken by you on the basis of the information contained herein is your responsibility alone and Tata Asset Management Pvt. Ltd. will not be liable in any manner for the consequences of such action taken by you. Please consult your Mutual Fund Distributor before investing. The views expressed in this article may not reflect in the scheme portfolios of Tata Mutual Fund. There are no guaranteed or assured returns under any of the scheme of Tata mutual Fund.

*Mutual Fund Investments are subject to market risks, please read all scheme related documents carefully.

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