Order Entry
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.