Mario Gabelli acquired 73.5 Thousand ON Semiconductor shares worth $3.28 Million. That's 0.03% of their equity portfolio (400th largest holding). The first ON Semiconductor trade was made in Q3 2008. Since then Mario Gabelli bought shares three more times and sold shares on one occasions. The stake costed the investor $512 Thousand, netting the investor a gain of 540% so far.