Abstract Four ethylene‐1‐decene copolymers, covering a wide range of compositions, were analyzed in solution by means of 13C NMR spectroscopy. A detailed assignment of the signals to the different triad sequences was carried out. The experimental triad distributions were compared with calculations assuming Bernouillian and first‐order Markov statistics, finding a better agreement for the latter model. The triad distributions were also used for the determination of the reactivity ratios of the two comonomers.