[GUEST ACCESS MODE: Data is scrambled or limited to provide examples. Make requests using your API key to unlock full data. Check https://lunarcrush.ai/auth for authentication information.]

![kshaughnessy2 Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::22259843.png) kristen shaughnessy [@kshaughnessy2](/creator/twitter/kshaughnessy2) on x 24.3K followers
Created: 2025-07-10 19:27:41 UTC

"Citadel Securities bought Morgan Stanley’s unit focused on electronic market-making for US equity options, expanding the firm’s already dominant role in the popular derivatives, according to people familiar with the matter.

The trading firm founded by billionaire Ken Griffin acquired Morgan Stanley’s on-exchange options business and took on a large portfolio of equity options positions, the people said. 

The deal includes specialist posts on venues including Cboe, Nasdaq, NYSE and MIAX, the people said, asking not to be identified discussing private information...

...Morgan Stanley was the last major bank in the market-making business, which is now dominated by high-frequency trading firms.."

![](https://pbs.twimg.com/media/GvhQcf9WEAEQa00.jpg)

XXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1943391694164205627/c:line.svg)

[Post Link](https://x.com/kshaughnessy2/status/1943391694164205627)