Style Drift
The tendency of a broker or investment portfolio manager to alter his or her investment style over time.
Investopedia Commentary
This occurs for any number of reasons, but one main force is changing trends in the general investing environment. During the dotcom boom, for example, many managers - regardless of the strategies they were initially bound by - were able to justify tech stocks in their portfolio because everybody was buying them.
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See also: Broker, Focused Fund, Portfolio, Portfolio Manager, Style