HDFC Bank Stock Plunges 8.6%: Which Mutual Funds Are Most Exposed?

Introduction: A Sudden Shock for HDFC Bank

Shares of HDFC Bank experienced one of their most severe single-day declines since the Covid-19 pandemic on Thursday, March 18, 2026. The stock plummeted 8.6% on the National Stock Exchange (NSE), hitting a 52-week low of ₹770 per share during intraday trading. The sharp sell-off was triggered by the sudden resignation of Atanu Chakraborty, the bank's part-time Chairman and independent director. Chakraborty cited "ethical concerns" and practices that did not align with his personal values as the reasons for his departure, a development that sent shockwaves through the market and raised questions about the lender's corporate governance.

The Catalyst for the Sell-Off

The resignation of a chairman is a significant event for any company, but when accompanied by remarks on ethical issues, it becomes a major red flag for investors. Atanu Chakraborty's statement that he observed certain practices over the last two years that were inconsistent with his values immediately spooked the market. This led to intense selling pressure on the stock, erasing a significant portion of its market capitalization in a single session. The bank's American Depositary Receipts (ADR) also reflected the negative sentiment, declining over 7% overnight. While the bank issued clarifications stating there were no undisclosed concerns, the chairman's exit under such circumstances has undeniably weighed on near-term investor confidence.

Widespread Impact on Mutual Funds

The sharp fall in HDFC Bank's stock has had a direct and substantial impact on the Indian mutual fund industry. The bank is a cornerstone holding for a vast number of equity schemes. As of the end of the December 2025 quarter, mutual funds collectively held a significant 26.66% stake in HDFC Bank. Before the crash, data from February 27, 2026, showed that mutual funds held nearly 359 crore shares valued at approximately ₹3.19 lakh crore. With 49 different mutual fund houses holding the stock, the sudden drop in its value has likely eroded the Net Asset Values (NAVs) of numerous large-cap, flexi-cap, and index funds across the industry.

Top Funds with the Highest Exposure

Several mutual funds had a considerable portion of their assets invested in HDFC Bank, making them particularly vulnerable to the stock's decline. As of December 2025, Navi Mutual Fund had the highest exposure in percentage terms, with the stock constituting 7.83% of its total assets under management (AUM). It was closely followed by PPFAS Mutual Fund at 7.48% and UTI Mutual Fund at 7.39%. In absolute terms, large fund houses like SBI Mutual Fund held the highest value, with holdings worth ₹80,201.6 crore.

Here is a summary of the top 10 mutual funds with the highest exposure to HDFC Bank based on their AUM at the end of December 2025:

Source: ACE Equity, Data as of December 2025

Fund Manager Activity in the Preceding Quarter

An analysis of fund manager activity in the third quarter of fiscal year 2026 (October-December 2025) reveals a mixed sentiment towards the banking giant. While some funds were aggressively increasing their positions, others were trimming their stakes.

Funds That Increased Stakes

Showing strong conviction, Quant Mutual Fund dramatically increased its exposure to HDFC Bank by 5,066% compared to its September 2025 holding, acquiring 5.5 million shares. Similarly, new entrant Jio BlackRock Mutual Fund raised its holding by 1,991.6%. Other notable buyers included WhiteOak Capital MF, which increased its stake by 18.17%, and DSP MF, which added 9.62% more shares.

Funds That Reduced Stakes

On the other side, Samco Mutual Fund led the sellers, cutting its stake by a substantial 81.34% during the December quarter. Mahindra Manulife MF also reduced its holding by 16.31%, selling 1.3 million shares. Among the larger players, SBI Mutual Fund trimmed its position by 3.16%, offloading over 26.43 million shares, indicating a slight reduction in its otherwise massive holding.

Broader Market Implications

The turmoil in HDFC Bank's stock is not an isolated event. Given its colossal weightage in benchmark indices—13.52% in the NIFTY50 and 29.39% in the Bank NIFTY—its performance has an outsized impact on the entire market. The 8.6% crash was a primary driver behind the broader market decline, dragging the Sensex and Nifty down. The negative sentiment was compounded by a cautious global environment, with the U.S. Federal Reserve holding interest rates steady but signaling a higher inflation outlook, which dampened investor confidence across asset classes.

Analysis and Outlook

The sharp correction in HDFC Bank's stock is a stark reminder of how governance issues can override strong financial performance in the eyes of investors. Despite the bank's solid fundamentals and its status as a core holding for hundreds of institutional investors, the chairman's abrupt exit on ethical grounds has introduced a significant element of uncertainty. The event tests the long-held conviction of many fund managers. While the stock's technical indicators may suggest it is oversold, the path to recovery will likely depend on the bank's ability to address the governance concerns transparently and reassure its stakeholders. For mutual fund investors, this event highlights the importance of diversification, as even a blue-chip stock is not immune to sudden shocks.

Conclusion

The resignation of HDFC Bank's chairman has triggered a significant market event, leading to a steep fall in its stock price and causing considerable collateral damage to mutual fund portfolios. Funds with high concentrations in the stock have seen their NAVs impacted. The market will now be closely watching for further clarifications from the bank's management and any subsequent actions from institutional investors. Fund managers will need to re-evaluate their positions and decide whether the current crisis presents a buying opportunity or a signal to de-risk their portfolios from a stock now clouded by governance concerns.