Mobay

 Sarin and Mustard Gas is produced by Mobay (1954)

Mobay is a Subsidiary Split Off of Monsanto (1901) and joining of Bayer (1954) who were responsible for HIV infected blood products.

It seems that since Monsanto technically created Sarin , so they could effectively hold the Patent and permissions for it's key ingredients usage with Mobay.
See, back in the 1970s, Mobay brought out all the shares that Monsanto had of Mobay,
but it seems that they still work together even today.

In 2002 Monsanto was found guilty of “negligence, wantonness, suppression of truth, nuisance, trespass, and outrage.  (source: http://decryptedmatrix.com/live/monsanto-the-godfather-of-chemical-capitalism)

Interestingly, Monsanto's influence can bee seen in today's Detergent dominance by Unilever, since Monsanto sold their "All Detergent" to them in 1946, just as Unilever was Born. Also Coca Cola, which, without buying Monsanto's supply of Saccaharin, would not be selling Diet Coke, Sprite or Fanta today. Other famous, and infamous products include:

 Aspirin, Aspartame (Saccharine is the main ingredient), Vanillin, even Sulphuric Acid. Even PCBs and Agent Orange (of which a co-inventor scientist joined Oppenheimer's Manhattan Project). All this came from Monsanto.

We all Know that Monsanto is not a good company, compromising people's health, and monopolizing markets for profit, but they aren't the only ones:
Bayer has done it too


Full Story:
Bayer Documents: AIDS Tainted Blood Killed Thousands of Hemophiliacs

In April 1990, Mobay and Occidental Chemical Corporation refused to supply the Department of Defense with thionyl chloride, a chemical needed for the production of Sarin. 

The US government considered filing suit against Mobay and Occidental for violating Title III of the Defense Production Act of 1950, which gives the government the power to requisition supplies for warfare.