Third Party Support

Gemini allows OMS/OEMS firms to send orders on behalf of existing Gemini accounts after signing a service bureau agreement.

Once the agreement is signed, Gemini provides a unique CompID for the account. The OMS/OEMS should use this CompID in the OnBehalfOfCompID <115> field of the header:

• The customer's Gemini account identifier is used in OnBehalfOfCompID <115>
• The third-party firm identifier is used in SenderCompID <49>

Required Fields for Third-Party Messages

The following messages require both OnBehalfOfCompID <115> and SenderCompID <49>:

• New Order Single <D> for submitting orders on behalf of that account
• Order Cancel Request <F> for canceling orders on behalf of that account

Execution Report Echo Fields

When Gemini sends an Execution Report <8> in response to one of these messages:

• It echoes back the SenderCompID <49> value in the header
• The value originally in OnBehalfOfCompID <115> is placed into DeliverToCompID <128>

See Drop Copy: Third Party Support for details on Drop Copy third party support.