The Cleansweep Eleven, manufactured by the Cleansweep Broom Company, was released in 1995, making it the latest broomstick in the series.
Ron Weasley received one as a reward upon being made a Prefect (OP9) and was very happy about it. He tried out for and became a Keeper on the Gryffindor Quidditch Team flying a Cleansweep 11 (OP11, OP13, OP19, HBP11).
Lexicon list of Broom Manufacturers
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