ETF-Sparer spüren kaum etwas: Nvidia-Aktie auf Talfahrt: Was Anleger tun sollten

Over the past month, the share price of Nvidia, the American chip manufacturer, has been declining. Recent aggravating factor was the revelation of multiple extramarital affairs involving the company's CEO, Jensen Huang, who subsequently resigned. Since the beginning of October, the stock price, which was around 240 US dollars per share, has fallen by approximately 30 percent.

What does this mean for investors? Behavioral economist Prof. Hartmut Walz advises investors holding Nvidia as a single stock in their portfolio to keep a low profile. "Activating in such a situation would be a serious craft error," he warns, irrespective of whether it is a purchase or a sale. Selling would realize past book losses and deprive those exiting the position of the chance to benefit from a possible recovery of the stock price.

Conversely, buying more would be a risky bet on the very recovery. ETF investors are largely unaffected by Nvidia's turmoil, according to Walz. "The turbulence demonstrates that diversification works," adds Niels Nauhauser from the Verbraucherzentrale Baden-Württemberg. "Typical ETF investors are virtually unaffected by Nvidia's turbulence."

Despite Nvidia's presence in popular worldwide indexes such as the FTSE All World and the MSCI World, with a combined market share of around five percent - second only to Apple - diversification protects against individual risks. "The loss of Nvidia was compensated by profit gains from other stocks," explains Prof. Hartmut Walz.

Therefore, the money deducted was simply reinvested in other companies. This effect, where one's loss becomes another's gain, is often observed, albeit not always. "The cake does not become smaller by cutting the pieces differently," notes Walz. Therefore, for broadly diversified ETF investors, doing nothing is the right course of action.

"One should never react to such events, or risk undermining the long-term success of a buy-and-hold investment strategy," advises consumer protector Niels Nauhauser. According to Walz, broad diversification across countries, industries, and asset classes is the best way to protect against individual risks on the stock market.