TSO Tesoro Corporation
NYSENo longer listedCommon stock
TSO was the NYSE ticker symbol of Tesoro 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.
TSO at a glance
- Symbol
- TSO
- Company / issuer
- Tesoro Corporation
- Security type
- Common stock
- Last exchange
- NYSE
- Status
- No longer listed
- Seen in listing files
- Apr 2015
TSO ticker history
All listing names we have recorded under the symbol TSO, from periodic snapshots of US exchange listing files.
| Name | Security | First seen | Last seen |
|---|---|---|---|
| Tesoro Corporation | Common Stock | Apr 2015 | Apr 2015 |
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 TSO?
TSO was the ticker symbol of Tesoro Corporation on NYSE.
Is TSO still trading?
No. TSO does not appear in current US exchange listings as of Sep 2026; it was last seen in our listing snapshots in Apr 2015.
Which exchange was TSO listed on?
TSO was listed on NYSE.
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