Technical Notice

Reminder: Odd Lot Transactions User Acceptance Test

November 18, 2013

As a reminder, FINRA will begin disseminating odd lot transactions via the Trade Data Dissemination Service (TDDS) on Monday, December 9, 2013. To support odd lot trade dissemination, FINRA will introduce the new sale condition modifier, Odd Lot Trade ("I"), which will be available to any participant to distinguish a trade resulting from a market center's execution in increments less than the defined round lot size. Odd Lot Trade transactions will be included in volume statistical calculations only. The Odd Lot Trade modifier value "I" will appear in the Sale Condition field of TDDS transaction messages.

User Acceptance Testing Details

From 9 a.m. to 12 p.m. Eastern Time on Saturday, November 23, 2013, and Saturday, December 7, 2013, market participants and data vendors are invited to test odd lot transaction reporting and dissemination for OTC securities.

Authorized firms can enter and process test odd lot transactions and data vendors can process the transactions during the User Acceptance Tests (UAT). Firms reporting trades during the tests should use their production lines and vendors receiving TDDS data should connect via their production connection ports and circuits as outlined below.

Connectivity requirements (TDDS)

  • TDDS:
    • Group IP =
    • Port = 55360
    • Source IP =
  • To purchase a circuit, contact NASDAQ OMX Subscriber Services at (212) 231-5180, Option #3. If you connect via extranet, please contact your provider.

User Acceptance Test Contact

On the day of test, contact NASDAQOMX Technical Support at (212) 231-5180.

If you have questions about this notice, contact FINRA Product Management at (866) 899-2107.