 He finished second in 500 m, and won the 1500, 5000 and 10,000 m events.De Koning won the national all-around title in 1903, 1905 and 1912, and set national records in the 500 m and 10,000 m in 1905; these records stood until 1926 and 1929.De Koning also set a world record in one-hour skating, at 32,370 m in 1906, and won the Elfstedentocht in 1912 and 1917.