In a survey of US businesses with fewer than 5,000 employees that had been growing to scale over the past 5 years, 3 out of 4 of those businesses achieved that growth in part through outsourcing at least half of their additional staffing needs
About 40% of those companies also raised compensation levels for current employees, and a little over 50% had to bring in new hires from outside the company to plug knowledge and ability holes.
Further, more than 6 out of 10 respondents had found their IT systems were not sufficient to operate at scale and had to scale their technology infrastructure in proportion to the growth of the business in order to maintain functionality, as well.
You can read more about that survey here.