I was wondering how big sized combo stock/option trades are arranged. For instance, this OTC short trade on OZON happened on January 31, where someone shorted 45780 shares @ 20.61: OZON 2022-01-31 15:09:42 20.61 45780 1854395 20.64 20.68 It is labelled by my data vendor like a trade paired with an option. The nearer option trade I could find was the following, where someone shorted 500 OZON PUT 17.5 (June) @ 1,96 twenty seconds earlier: OZON2217R17.5 2022-01-31 15:09:22 1.96 1635 1635 1.9 2.15 226858219 C 108 20 Given the size of the trasaction, probably it was a kind of istitutional trade and it was preshopped. If I am not misinterpreting the data, probably the buyer is covering some costs of his/her short position by selling some puts. I was wondering when Institutions shop for a big sized combo stock/option trade like this, the Market Maker also offers to find a suitable price for the underlying. Or is up to the buyer to find a godd price for both of them (option and stock) and then issue the combo trade? Also how much time can last such a combined trade? In this case took 20 seconds to complete.