The MNI India Business Sentiment Indicator, a gauge of the current sentiment among BSE listed companies, fell 2.5 per cent to 62.3 in May, from 63.9 in April.
"The May report confirms that the trend in business activity is down, with overall sentiment, output and orders all continuing to fall from the Q4 peak," Chief Economist of MNI Indicators Philip Uglow said.
This is the lowest level for the index since April 2014, which coupled with decline in output and orders point to a reduction in business activity.
Companies, according to the report, saw a significant weakening in both domestic and export orders. The index for new orders fell sharply to 57.1 in May 2015, the lowest since May 2013, while export orders shrank to 53.6, the weakest since June 2013.
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On inflation, it said, weak demand and competition have capped prices.
"Along with the continued soft official data on production and exports and the low level of inflation, we expect RBI to cut rates further at the June 2 monetary meeting," Uglow added.
The central bank has lowered its policy rate twice so far in 2015, but maintained a status quo in its last policy review on April 7 on fears of unseasonal rains impacting food prices.
The next review meet is scheduled on June 2, although the previous two cuts took place outside the policy cycle.
MNI Indicators, part of the Deutsche Borse Group, offers macro-economic data and insights into businesses and investment community.