TMST TimkenSteel Corporation
TMST was the NYSE ticker symbol of TimkenSteel Corporation. It no longer appears in current US listing files, which usually means the security was delisted, acquired, merged, or moved to a new symbol. SEC records list “TimkenSteel Corp” as a former name of Metallus Inc., which trades today as MTUS.
TMST at a glance
- Symbol
- TMST
- Company / issuer
- TimkenSteel Corporation
- Security type
- Common stock
- Last exchange
- NYSE
- Status
- No longer listed
- Seen in listing files
- Apr 2015 – Jan 2024
- Sector
- Industrials
- Industry
- Steel/Iron Ore
- Country
- United States
- IPO year
- 2014
- Last reported market cap
- $914.0 million (Jan 2024)
TMST ticker history
All companies and securities we have recorded under the symbol TMST, from periodic snapshots of US exchange listing files.
| Name | Security | First seen | Last seen |
|---|---|---|---|
| Timken Steel Corporation | Common Shares | Apr 2015 | Apr 2015 |
| TimkenSteel Corporation | Common Shares | Jan 2021 | Jan 2024 |
Snapshots have gaps (notably 2018–2021, and 2015–2021 for NYSE listings), so the actual delisting date may be later than the last-seen date.
Frequently asked questions
What company has the ticker symbol TMST?
TMST was the ticker symbol of TimkenSteel Corporation on NYSE.
Is TMST still trading?
No. TMST does not appear in current US exchange listings as of Sep 2026; it was last seen in our listing snapshots in Jan 2024. The company now appears to trade as MTUS (Metallus Inc.).
Which companies have used the ticker TMST?
Our listing records show TMST used by: Timken Steel Corporation; TimkenSteel Corporation.
Which exchange was TMST listed on?
TMST was listed on NYSE.