| Industry | Engineering |
|---|---|
| Founded | 1834 |
| Founder | William Alltoft Summers, John Thomas Groves, Charles Arthur Day, William Baldock |
| Headquarters | , England |
| Products | Locomotives and shipbuilding |
Day, Summers and Company was a British steam locomotive manufacturer and shipbuilder in the Southampton area. The company's history is complex and involves five men: William Alltoft Summers, John Thomas Groves, Charles Arthur Day, William Baldock and Nathaniel Ogle.