Veteran investor and Asia-region expert Mark Mobius on Monday said recent events surrounding Adani Group should serve as a “good reminder” for investors to “rethink passive investing.”

What Happened: Mobius noted that major indices can be dragged down by a single constituent, in turn, heavily lowering the returns for passive investors.

The Mobius Capital Partners’ founder said he was glad the Indian markets were rebounding “so quickly,” and that it was wrong to pain all Indian companies with the “same broad brush.”

See Also: ‘Very Bullish’ Mark Mobius Predicts India’s IT Sector To Play Big Role In Global Semiconductor Production

Why It Matters: Adani Group stocks have faced immense pressure at the bourses ever since Hindenburg Research laid allegations of widespread financial malpractices at the conglomerate on Jan. 24.

Among the group’s publicly-listed companies, Adani Enterprises shares have slumped about 53% in a month, while Adani Ports & SEZ shares are down 26% over the same period.

Meanwhile, Nifty 50 is down 0.5% over one month. The index has recovered from 17,604.35 on Jan. 27, after the allegations, to 17,943.95 at the time of writing on Monday.

BSE Sensex is up 0.68% over the period, recovering from 59,330.90 on Jan. 27 to 61,034.92 on Monday.

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