Who makes Styron now?
Styron is a Trinseo brand. In North America, polystyrene is made and sold by AmSty, a 50/50 venture of Trinseo and Chevron Phillips. Polymer: PS (GPPS, HIPS). Checked Nov 2, 2026.
The short answer
Owner now (Americas): Trinseo brand; in North America, PS is made and sold by AmSty (Trinseo and Chevron Phillips, 50/50)
Chapter 11
What changed, and when
AmSty sells STYRON A-TECH polystyrene in North America. Trinseo said in 2024 it wanted to sell its AmSty stake; no sale found as of Oct 2026. Trinseo has been in Chapter 11 since May 2026.
Sources
Ownership history
- Dow Chemical
- AmSty (Americas Styrenics; Dow and Chevron Phillips joint venture), North America (2008)
- Styron (Bain Capital); AmSty in North America (2010)
- Trinseo brand; in North America, PS is made and sold by AmSty (Trinseo and Chevron Phillips, 50/50) (2014)
What to check on your Styron paperwork
- Ask your seller about lead times and allocation while the case runs.
- Keep copies of your current data sheets, COAs and regulatory letters.
- Consider qualifying a second source now, before you need it.
Company names you may see on older Styron paperwork
Dow Chemical, Dow, Styron (company), Americas Styrenics. If an old drawing, COA or UL file names one of these, it can still refer to Styron.
Current Styron data sheets
AmSty STYRON GPPS data sheets. In the U.S., STYRON PS is sold by AmSty (Trinseo and CPChem venture). HIPS grades are at amsty.com/products/polystyrene-hips. Use the newest data sheet and COA from the current owner, not a copy saved years ago.
Styron grades on this site
Other brands from Trinseo brand
Altuglas, Calibre, Emerge, Magnum, Plexiglas, Pulse, Tyril.
Buying Styron or an alternative
ResinBridge quotes Styron where we can source it, or a matched alternative with what differs, from one gaylord to a railcar. See our guide to Polystyrene.
Questions
Who makes Styron now?
Styron is a Trinseo brand. In North America, polystyrene is made and sold by AmSty, a 50/50 venture of Trinseo and Chevron Phillips (checked Nov 2, 2026).
Did Styron change owners?
Status: Chapter 11. AmSty sells STYRON A-TECH polystyrene in North America.
Where do I find current Styron data sheets?
On the owner's site: AmSty STYRON GPPS data sheets. Use the newest data sheet and COA from the current owner.
From our resin brand ownership tracker, which covers 318 brands with a source for every row. Spot a change we missed? Tell us.
Need Styron or a matched alternative?
Send the Styron grade you run. A polymer chemist confirms it, quotes it where we can source it, or suggests a matched alternative with what differs.