The resurgence of AI-related trading has spurred a wave of retail investment, pushing shares of Taiwan Semiconductor Manufacturing (TSM.US) to a new all-time high. The stock of the world's leading chipmaker climbed to a record this week, fully recovering from its declines following the outbreak of the Iran conflict. As a key supplier to Nvidia (NVDA.US), Taiwan Semiconductor Manufacturing is scheduled to report earnings on Thursday, which will help global traders assess whether the rebound in AI infrastructure stocks is justified.

While institutional investors still hold the majority of Taiwan Semiconductor Manufacturing shares, the influence of individual investors is growing as their numbers surge. The count of "odd-lot" holders in the stock—often equated with retail investors—has increased by approximately 30% since the end of February, reaching a record high of over 2 million people. Odd-lot shareholders hold fewer shares than the standard trading unit, which is typically 100 shares.

A strategist noted that the current retail participation is not a cyclical spike but represents a structural shift in accessibility and narrative penetration. Taiwan Semiconductor Manufacturing has effectively crossed a threshold: it is no longer just a synonym for institutional semiconductor holdings but has become the "default entry point" for retail investors looking to access the AI cycle.

The number of odd-lot investors in Taiwan Semiconductor Manufacturing has now surpassed two million. In recent years, the growing importance of retail investors has been a global market theme. However, few companies have garnered such strong appeal among individual investors in their local market as Taiwan Semiconductor Manufacturing. The chipmaker holds a weighting of up to 45% in the benchmark Taiwan Weighted Index, which poses challenges for active funds with single-stock allocation caps of 10% but amplifies the influence of retail traders.

A more attractive regulatory environment is also playing a role. The introduction of regular investment plans, which support automatic and periodic purchases of stocks and ETFs, has encouraged greater household participation. The Iran conflict accelerated this trend, as foreign funds reduced positions to avoid risk, while local retail investors rushed into Taiwan Semiconductor Manufacturing. Data shows that in March, the proportion of odd-lot trading in the company's total transaction value rose, with one day's share nearing 20%.

According to the head of equity execution for Asia Pacific at a major bank, retail activity often increases with rising volatility, particularly as investors view any weakness as a buying opportunity. Odd-lot trading volume for Taiwan Semiconductor Manufacturing surged in March. The head of prime brokerage sales trading at a securities firm suggested that part of this surge may be due to arbitrage trading aimed at profiting from temporary price differences between odd lots and standard lots.

Nevertheless, exchange data shows that by the end of March, over 206,000 retail accounts were conducting regular investments in Taiwan Semiconductor Manufacturing stock, an increase of more than 20% from February. ETFs represent another major source of retail capital. The largest ETF in Taiwan recorded record inflows in March. This fund, which holds a more than 60% weighting in Taiwan Semiconductor Manufacturing, has nearly one million investor accounts enrolled in regular investment plans.

Currently, the number of odd-lot traders in Taiwan Semiconductor Manufacturing is close to 9% of Taiwan's population. The chairman of an investment trust observed that unlike during past events such as the 2008 financial crisis or the 2022 market downturn, a shift over the past year is that retail investors buy on dips but do not necessarily sell during rebounds. He added that this provides a "cushioning effect" for Taiwan Semiconductor Manufacturing's share price.

The recent return of market appetite for tech hardware stocks has also provided a boost. After Taiwan Semiconductor Manufacturing reported a 35% year-on-year increase in revenue for the January to March period last week, its upcoming detailed earnings report may deliver further positive news.