The market pummeled 401(k) accounts last week. Panic selling ensued.

Last week’s tariff-induced market sell-off ripped through 401(k) accounts, and over the weekend millions of savers and retirees took matters into their own hands.

People pulled vast sums of 401(k) money from large US equity funds and target date funds and shifted to more conservative stable value, bond, and money market funds, according to Alight Solutions ’ 401(k) Index.

Trading activity on Monday was almost 10 times an average day’s volume, with investors fleeing stocks for the safety of fixed-income funds, Rob Austin, head of thought leadership at Alight Solutions, told Yahoo Finance. It was the highest daily trading level since March 2020 when the pandemic hit.

Why the Monday meltdown? Historically, when stock markets have large losses on Fridays, very high trading activity in 401(k) plans follows on Monday, Austin said. People react to the news by tweaking their portfolios over the weekend, but those changes don’t get executed until the market reopens.

“The high volume isn’t surprising as people tend to sell during market drops and buy back after rebounds, which leads to selling low and buying high,” he said. “Saving for retirement is a marathon, not a sprint and a long-term approach to investing is generally wiser, even if it means enduring occasional downturns.”

Tell that to stressed-out investors and savers. They were all over the map.

“Engagement with the markets was high among Schwab's retail clients last week,” Alex Coffey, senior trading and derivatives strategist at Charles Schwab, told Yahoo Finance.

More clients bought equities than sold, Coffey said. But in terms of dollar amounts, clients were net sellers — meaning the amount of money behind selling transactions was bigger.

In terms of individual names, there weren't many surprises. Nvidia ( NVDA ) was the most-bought stock, followed by Amazon ( AMZN ), Apple ( AAPL ), and Tesla ( TSLA ).

“We also saw a lot of buying in index-tracking ETFs, perhaps as a volatility-driven alternative to investing in individual stocks where risk can be higher,” Coffey said.

Lindsay Theodore, a certified financial planner at T. Rowe Price, said not all her clients reacted the same way.

“Some see the volatility as an opportunity to redeploy cash that had been sitting on the sideline,” she said. “Others are worried and seeking validation that they’re in the right investments and on the right track.”

Read more: How to protect your money during economic turmoil, stock market volatility

What financial experts are telling retirement savers

You can remind people again and again to sit on their hands instead of making big moves to jettison their stock holdings during economic turmoil and stock market volatility, but human nature often takes over.

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