Every August, the Philippine Stock Exchange enters what many traders half-jokingly call the “quiet season.” Known in Chinese culture as Ghost Month, it is traditionally viewed as an unlucky period for big financial moves, from signing contracts to investing. The question is: does it really haunt the stock market?
The Evidence
Studies suggest some impact, though not uniformly strong:
- A 2016 academic study (Almonte) found significant underperformance in the Financials, Holding Firms, and Industrial indices during August when measured on the Gregorian calendar.
- A later review, however, said the overall Ghost Month effect was inconclusive, with no consistent pattern across years or indices.
Market data paints a clearer behavioral picture:
- BDO Securities reports that trading volume in the PSE drops an average of 4.9% during Ghost Month, with some years seeing declines of over 20%.
- Price action is mixed: in the last 10 Ghost Months, the PSEi still posted gains in six years, averaging +0.6%.
- Anecdotally, fund managers note that investor caution, fewer block trades, and thinner liquidity are common during the period.
What It Means for Investors
While the numbers show trading slows down, Ghost Month is not a guaranteed bearish trap. Instead, it reflects a sentiment shift. Some investors stay on the sidelines, creating lower volume and, sometimes, sharper moves in thinly traded stocks.
Ghost Month appears more rooted in investor psychology than in market mechanics. It dampens trading volume more reliably than it affects returns. For long-term investors, understanding the sentiment shifts, not just superstition—can help turn Ghost Month into an opportunity rather than a trap.
As one fund manager told Off Market Hours: “Ghost Month is more about psychology than performance. It’s not a curse; it’s a behavior.”