| Abbreviation | Definition |
|---|---|
| DL | Dial Corporation |
| DLB | Dolby Laboratories, Inc. |
| DLJPA | Donaldson Lufkin & Jenrette Preferred A |
| DLJPB | Donaldson Lufkin & Jenrette Preferred B |
| DLJPT | Donaldson Lufkin & Jenrette Capital Trust I |
| DLM | Del Monte Foods Company (de-listed 2011) |
| DLP | Delta & Pine Land Company |
| DLW | Delta Woodside Industries, Inc. |
| DLX | Deluxe Corporation |
| DMAIX | Dreyfus Massachusetts Intermediate Municipal Bond Fund |
| DMCA | Dairy Mart Convenience Stores Class A (former symbol, now DMCSQ) |
| DME | Dime Bancorp, Inc. |
| DMH | Ducati Motor Holdings, SPA. |
| DMN | Dimon, Inc. |
| DNA | Genentech, Inc. |
| DNA | Genentech, Incorporated |
| DNB | Dun & Bradstreet Corporation of Delaware |
| DNL | WisdomTree Global ex-US Growth fund |
| DNN | Denison Mines Corporation |
| DNP | Duff & Phelps Utilities Income Fund |