At 9.10am the benchmark FTSE Bursa Malaysia KLCI (FBM KLCI) was down 4.08 points at 1,522.98 from Friday's close of 1,527.06.
The index opened 5.34 points at 1,521.72.
It opened weak amid regional market uncertainty including tracking a weak close on the Wall Street market on Friday.
On the broader market, investors saw losers outnumber gainers by 252 to 111, while 259 counters were unchanged, 1,647 untraded and 11 suspended.
Total turnover at 223.78 million units worth RM112.02 million.
Ratuken Trade Sdn Bhd's vice president of equity research, Thong Pak Leng, said the Wall Street market experienced a slump as investors repositioned into the bond market as 10 -year yields fell to 1.77%.
He added that the KLCI is experiencing some problems and is expected to hover at 1,520-1,535 on Monday.
Heavyweights saw Malayan Banking Bhd (Maybank) fall 5 sen to RM8.23, Public Bank Bhd and Petronas Chemicals Group Bhd (Petchem) remained at RM4.18 and RM8.89, IHH Healthcare fell 3 sen to RM6.54, CIMB Group Holdings Bhd fell 7 sen to RM5.23 and Tenaga Nasinal Bhd (TNB) rose 4 sen to RM9.14.
Active stocks saw Dagang NeXchange Bhd (DNeX) up 1.5 sen at RM1, Coraza Integrated Technology Bhd added 8 sen at 74 sen and Aimflex Bhd and OCR Group Bhd jumped 0.5 sen at 18 sen and 15 sen.
On the index board, FBM ACE bloomed 6.59 points at 6,131.11, FBM Emas fell 28.39 points at 10,930.86, FBMT 100 declined 27.82 points at 10,637.63, FBM Emas Shariah plunged 15.12 points at 11,646.08 and FBM 70 lost 32.14 points at 13,442.69.
The Financial Services Index declined 72.26 points at 15,701.35, the Products and Services Industry index declined 0.12 points at 200.71 and the Malay Plantation index 6.81 points at 6,692.47.
