Yes, db2 has a top like utility called db2top written by 2 IBMers Subho Chatterjee and Jacques Milman. It uses DB2 snapshot APIs to extract information from DB2 engine and shows in a format that you are familiar with top utility on Unix systems.

Click at this link at get more information on this utility. This utility has been included in regular DB2 product since DB2 8.1 FixPak 16.

You can look at this IBM Alphawork (for emerging technologies) site for details on this tool.

Generally people ask question as how can they run db2top on windows and answer is No. But you can catalog your Windows DB2 database in your Unix system and then run db2top against your windows database.