Volume reached 5.96 billion shares worth 1.5 billion pesos (27.2 million dollars) from Monday's 7.78 billion shares worth 1.74 billion pesos.
The broader all-shares index fell 6.72 points to 1,197.33. Losers beat gainers 97 to 27, with 35 stocks unchanged.
Dealers said investors had cashed in on recent gains ahead of the launch of initial public offerings for SM Investments Corp and Manila Water Co Inc expected in March. "We were having a rebound until mid-trade but when the key index fell below another support level (at 2,020), investors panicked," Rommel Macapagal of Westlink Global Equities, said.
The market's next support level was at 1,970 points, dealers said.
Benpres Holdings, the most actively traded stock, closed up four centavos at 1.30 pesos, giving back some early gains after it said it was in discussions with various parties over the sale of a substantial stake in Manila North Tollways Corp.
Benpres affiliate First Philippine Holdings was up 2.50 pesos at 52.50 pesos. Philippine Long Distance Telephone Co was up five pesos at 1,360 pesos. Ayala Land Inc fell 50.00 centavos to 8.70 pesos and parent Ayala Corp retreated 40.00 centavos to 7.30 pesos. A and B shares of San Miguel Corp fell 50.00 centavos to finish at 57.00 pesos and 80.00 pesos, respectively.