Cemex DUNS number in the Federal Procurement database is 811645654.

In looking at the Procurement DB there were other companies under the same DUNS - Rinker for example. (Australia Connection)

From Wiki: Rinker Group was acquired by CEMEX, the world's third largest cement producer, through its subsidiary CEMEX Australia Pty Ltd. in a $14.2 billion USD takeover bid. As of June 2007 CEMEX owned a 67.3% stake in Rinker Group. The Chief Executive Officer was David Clarke, who had long worked in CSR's heavy building products division. The chairman of the board of directors was Hector Medina, executive vice-president of CEMEX. The other board members were also nominees from CEMEX.

CEMEX Australia was sold to Holcim in June 2009 as part of a $2 billion AUD takeover bid, and is now known as Holcim Australia. The deal included the Readymix and Humes business units and CEMEX's 25% stake in Cement Australia (one of Australia's major cement manufacturers), but did not include the US-based Rinker Materials Corporation.[2]

Tanner Companies is another DBA (pic related)