Cboe Exchange has announced the appointment of Citadel Securities LLC as designated primary market maker (DPM) in classes to which Morgan Stanley and Co. LLC was previously appointed DPM.

Pursuant to Exchange Rule 3.53(f), on July 2, 2025, the Exchange appointed Citadel, on an interim basis, to act as the Off-Floor DPM in all of the classes to which Morgan Stanley had previously been appointed as Off-Floor DPM.

Effective September 2, 2025, pursuant to Exchange Rule 5.50(h), the Exchange is appointing Citadel as the Off-Floor DPM in all but 17 of the classes to which Morgan Stanley had previously been appointed as the Off-Floor DPM.

The 17 classes to which Citadel is not being appointed to act as Off-Floor DPM are as follows: AGNC, CLNE, GLD, GRNT, HOLX, IBRX, INMB, JBLU, KO, MODG, MPW, NVO, PLUG, TSLL, WOW, XYX, ZK.

Citadel is terminating its interim DPM appointments to these 17 classes as of the close of trading on August 26, 2025. The Exchange will reallocate these 17 classes effective as of the opening of trading on August 27 pursuant to the Exchange’s current standard DPM reallocation process.