Worldwide, chemical companies saw a slight increase in revenues in 2013. The top 50 companies showed combined revenues of $ 980.5 billion (US); an increase of 1.7 % [1].
The general trend for companies at the moment is to focus their business on core areas instead of looking out for large mergers.

The Top Ten Chemical Companies

with amount of chemical sales ($ millions) and as a percentage of the company’s total sales (%)

Chemical Sales of Global Top 50 Companies by Region

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All data taken from:

[1] Alexander H. Tullo, C&EN’s Global Top 50 Chemical Firms For 2014, C&EN  2014, July, 10–13. Link

Also of interest:

• Top Ten Chemical Companies 2012,
  ChemViews Mag. 2013.
  DOI: 10.1002/chemv.201300088
• Top Ten Chemical Companies in 2011,
  ChemViews Mag. 2012.
  DOI: 10.1002/chemv.201200101
• All Industry Roundups