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At 2 p.m. on a sunny afternoon in August, Ms. Zhang — known reverently within the company as “Chairlady” — walked into the Old Town mill for its grand opening.

Then she turned her face to Ms. Zhang, whom she called “our Chairlady.”

Another software techie, Li Yuqin, chairlady of Beijing TRS Information Technology, became a billionaire this week.

Liu Di, 54, chairlady of Beijing Sanlian Hope Shin-Gosen Technical Service, last week became a billionaire on gains in the share price of Shenzhen-listed Beijing Sanlian Hope New Synthetic Technical Services, a supplier of textile industry technical services.

The company’s chairlady is Cheung Yan, dubbed China’s “wastepaper queen” for gathering wastepaper worldwide and turning it into packaging paper that is mostly sold in China.