This bit of reported speech (did it come from an article or a blog?) is typical of the writing style used by business and financial reporters. It's not easy, and is frequently incorrect. What's more, authors of these sorts of articles often employ lots of jargon which most people outside of the financial world are not familiar with.
In my opinion, use of the term "rally" means that "Citic Securities Co. jumped more than 5 percent,leading a revival for brokerages...
This "revival" could mean that the share price of other brokerage firms traded on the exchange increased that day.
"Paced gains", as it's used in your example, could have many meanings. When I first read it, I thought it may have been a typo. "Posted gains" came to mind. But, "pace" also means "to lead in order to establish a competitive speed" and this would make some sense given the context of the rest of the paragraph.
I wish I could answer your question definitively, but there are so many possibilities that I cannot say for certain.
Let's see what others have to say.
Student or Learner