We read in Exodus 14 that Pharaoh personally led his army against the Jews.
There are differing opinions in the Midrash1 concerning his fate. Some say that he drowned in the Red Sea together with his army, while others opine that he survived the miraculous event. He survived in order to retell a firsthand account of the miracles and wonders that G‑d performed.
According to one Midrash,2 he made his way to Nineveh, Assyria, where he became king—the same king who when hearing the prophet Jonah's message from G‑d foretelling Nineveh's destruction, encouraged all his subjects to repent in order to avert the divine decree. Apparently he had learned his lesson.
Wishing you a happy and kosher Passover!
Yours truly,
Rabbi Menachem Posner

Exodus 15:19 KJV — For the horse of Pharaoh went in with his chariots and with his horsemen into the sea, and the LORD brought again the waters of the sea upon them; but the children of Israel went on dry land in the midst of the sea.
This is just a verse from scripture that doesn't provide any clarifying answer to the question.
"For the horse of Pharaoh went in with his chariots and with his horsemen into the sea" neither states nor implies that Pharaoh went into the sea with his horse.