I think that I understand what this change for Round Lots thing is about, and here's how it affects data...
Only "round lots" go into data that make up historical charts, but the definition of a round lots will change next week. See the link below, but as an example, previously a 40-share trade for a $300 stock would be ignored - that $12,000 trade wouldn't have any effect in a chart! That's no longer the case, because this is now a "full/round lot" trade.
Schwab has a good explainer here -
https://www.schwab.com/learn/story/round-lots-regulatory-changes
Question: It's not mentioned in the link, but I wondered if the change affected the number of shares controlled by option contracts?
The answer is "no". Equity options are standardized by the Options Clearing Corporation (OCC), which is a separate from the SEC's amendments to Regulation NMS (Rules 600(b) and 603(b)) that updates the round lot definition for quoting and displaying stock order sizes to improve transparency. (Source: Grok)
Only "round lots" go into data that make up historical charts, but the definition of a round lots will change next week. See the link below, but as an example, previously a 40-share trade for a $300 stock would be ignored - that $12,000 trade wouldn't have any effect in a chart! That's no longer the case, because this is now a "full/round lot" trade.
Schwab has a good explainer here -
https://www.schwab.com/learn/story/round-lots-regulatory-changes
Question: It's not mentioned in the link, but I wondered if the change affected the number of shares controlled by option contracts?
The answer is "no". Equity options are standardized by the Options Clearing Corporation (OCC), which is a separate from the SEC's amendments to Regulation NMS (Rules 600(b) and 603(b)) that updates the round lot definition for quoting and displaying stock order sizes to improve transparency. (Source: Grok)
Rename
My research on the subject, specifically around options is the same. Options contracts will still all continue to control 100 shares, regardless of underlying equity price.
(and thank goodness they are not touching that. That would make the math around options even more annoyingly complex, like futures!!)
(and thank goodness they are not touching that. That would make the math around options even more annoyingly complex, like futures!!)
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