As Chinese equities suffered a fresh downturn in July, quantitative funds came under renewed scrutiny, accused by some investors of accelerating the sell-off through aggressive share dumping, margin lending or short positions in index futures.Industry data, however, tells a different story. Several major quant funds were net buyers during some of the market’s weakest sessions this month, according to the Private Securities Investment Fund Professional Committee under the China Securities Investment Fund Association, as reported by domestic media last week.Market participants said the buying pattern reflected the way quantitative strategies were designed to operate.“Quant funds actually provide market liquidity rather than making one-sided directional bets,” said Wang Zheng, chief investment officer at Shanghai-based venture capital investment firm Jingxi Investment Management.Wang added that quant funds typically ran fully invested portfolios while keeping their overall positions constant, buying on dips and selling on rallies to maintain a fixed exposure.However, he noted that similarities among quantitative models could sometimes amplify market movements.