It's the highest since 2011.
Singapore's Purchasing Managers' Index (PMI) rose 0.2 points from August to 52.0 in September.
According to the Singapore Institute of Purchasing & Materials Management (SIPMM), the expansion is the highest since April 2011.
SIPMM said a faster rate of expansion in all key indicators boosted the reading.
Finished goods and input prices expanded but at a slower pace.
"The slower rate of expansion for stocks of finished goods was on the back of higher new orders, and this should bode well for the manufacturing economy," SIPMM said.
Manufacturing employment went back into expansion after four months of contractions.
SIPMM said this indicated sustained growth for the manufacturing economy since last year.
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