It did, but it was temporary:
> The goal of the ACA’s temporary reinsurance program was to stabilize individual market premiums during the early years of new market reforms (e.g. guaranteed issue). The temporary program is in place from 2014 through 2016. The program transfers funds to individual market insurance plans with higher-cost enrollees in order to reduce the incentive for insurers to charge higher premiums due to new market reforms that guarantee the availability of coverage regardless of health status.
https://www.kff.org/health-reform/issue-brief/explaining-hea...