SEOUL — As aging workforces grapple with shifting economic landscapes, a growing number of South Korean employees are taking personal control of their retirement savings. However, a recent market downturn has turned this financial independence movement into a cautionary tale of hidden concentration risk.

Between January and July, the number of workers shifting their retirement accounts from Defined Benefit (DB) structures to Defined Contribution (DC) schemes skyrocketed by over 118% compared to the previous year. Many of these transitions peaked in early summer as local equity markets hit euphoric highs, driven largely by relentless enthusiasm for artificial intelligence and semiconductor manufacturing.

Eager to capitalize on the bull run, retail investors funneled their severance funds into a variety of exchange-traded funds (ETFs), believing they were effectively diversifying their risk. The reality, analysts warn, is an illusion of choice.

A comprehensive review of top-performing ETFs popular in DC and individual retirement pension (IRP) accounts reveals a striking lack of true asset dispersion. Out of several prominent domestic equity and tech-focused funds, a dominant majority share heavily overlapping underlying assets. Prominent semiconductor and broad-market index funds routinely allocate more than half of their total weighting to just two corporate giants: Samsung Electronics and SK Hynix.

For an average investor, buying three or four different domestic tech or index ETFs does not spread risk; it merely multiplies exposure to the exact same corporate entities. When the semiconductor sector correction hit international and domestic markets, the impact on these self-managed retirement portfolios was severe. While U.S.-focused tech indices experienced moderate pullbacks, domestic heavy-tech and broad index portfolios suffered steep double-digit drawdowns within a matter of weeks, shrinking retirement nest eggs by nearly a third for those who bought near market peaks.

Financial experts point out that the burden is not entirely on retail investors. Most brokerage platforms provide itemized lists of constituent stocks for individual products, but lack aggregated dashboard tools that calculate a customer's total, cross-product exposure to a single company or industry. Because investors must manually tally overlapping weights across multiple funds, uncovering true portfolio concentration remains an uphill battle for non-professionals.

Unlike DB plans—where employers guarantee a fixed payout based on tenure and final salary—DC scheme payouts depend entirely on individual investment performance. For workers nearing retirement age, these recent market corrections have translated into direct, irreversible losses on their long-term security.

Industry specialists argue that financial institutions must modernize their advisory tools. By implementing portfolio visualization software that highlights sector-specific clustering and encouraging broader geographic and style diversification—such as incorporating global dividend-growth assets alongside tech equities—brokerages can help everyday workers escape the trap of accidental over-concentration before the next market cycle unfolds.

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