I occasionally play around with options on equities, usually highly liquid stocks (i.e., Facebook, Google, etc.). I purchase and hold for usually a week to a couple of months (not day trading). When trading 1, 5, even 10 options... it's not a significant issue. But as I trade more and more options, I'm starting to be curious if there is a point that I need to change 'how' I trade? For example, I was looking at a volume chart on options that traded during the week, and volume is relatively low (averaging 5 on a trade, maybe 40 a day). Except when I did a single trade of 50 options, there is a rather large spike. Such that I can actually see my own personal trade on a volume chart, as it stands out significantly. To make things more interesting, it seems I'm the majority of open interest on that specific option. So far, not a big issue.. but as I move to larger purchases (100, 1000, etc.) do I need to change HOW I trade these options? Some of my concerns: 1) Will I personally exhaust liquidity on the option if my trade is 100x the average trade? 2) Will I inadvertently effect the price due to the larger purchases? 3) Am I going to end up being flagged on CNBC by the Najarian brothers who think I actually know what I'm doing? I am unaware exactly how I can change my trading mechanism. I do not mean making multiple purchases of smaller lots, but do concepts exist for options such as: 1) Blocktrades? 2) Darkpools? 3) Something else? Or should I just not even consider executing trades where I end up being 99% of open interest? Any ideas/feedback/suggestions would be greatly appreciated! Thank you!