# Parties

Repeating group denoting parties involved throughout the trade process:

<table><thead><tr><th width="118">Tag</th><th width="145">Name</th><th width="131">Data Type</th><th width="76">Req’d</th><th>Description</th></tr></thead><tbody><tr><td>453</td><td>NoPartyIDs</td><td>NumInGroup</td><td>Y</td><td>Number of parties in this repeating group.</td></tr><tr><td>448</td><td>PartyID</td><td>String</td><td>Y</td><td>Unique identifier for this party.</td></tr><tr><td>452</td><td>PartyRole</td><td>Int</td><td>Y</td><td>The role of this party.<br>Supported values:<br><code>3</code> = Client ID</td></tr><tr><td>447</td><td>PartyIDSource</td><td>Char</td><td>Y</td><td>The source of this party.<br>Supported values:<br><code>C</code> = Generally accepted market participant identifier</td></tr></tbody></table>