[Andreas]

In memberlist.php FIND

PHP Code:

 switch ($sortfield)
 {
         case 'username':
                 $sqlsort = 'user.username';
                 break; 


BELOW that ADD

PHP Code:

         case 'companyname':
                 $sqlsort = 'userfield.field5';
                 break; 


Revert to the original versions of your memberlist and memberlist_resultsbit templates.

Set your Company Name field to NOT show up on members list

In template memberlist FIND

<td class="thead" align="$stylevar[left]" nowrap="nowrap"><a href="$sorturl&amp;order=ASC&amp;sort=username&amp;pp=$perpage&amp;ltr=$  ltr$usergrouplink">$vbphrase[username]</a> $sortarrow[username]</td>

ABOVE that ADD

<td class="thead" nowrap="nowrap"><a href="$sorturl&amp;order=ASC&amp;sort=companyname&amp;pp=$perpage&amp;ltr=$ltr$usergrouplink">Company Name</a> $sortarrow[companyname]</td>

In template memberlist_resultsbit FIND

<td class="alt1Active" align="$stylevar[left]" id="u$userinfo[userid]">
		<a href="member.php?$session[sessionurl]u=$userinfo[userid]">$userinfo[musername]</a>
		<if condition="$show['usertitlecol']"><div class="smallfont">$userinfo[usertitle]</div></if>
	</td>

ABOVE that ADD

<td class="alt2Active">
		$userinfo[field5]
</td>