round lots in algorithmic trading

External question — Quantitative Finance Stack Exchange Author: mark leeds Original post: https://quant.stackexchange.com/questions/54309 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. In an automated strategy, is one restricted to buying round lots of 100 shares ? If so, 100 shares of google would be on the order of 100K. Is it possible to tell the broker that you don't want to buy round lots of certain stocks. Thanks.

External answer — Quantitative Finance Stack Exchange Author: mark leeds Original post: https://quant.stackexchange.com/a/54320 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Looks like my comment was completely wrong. Rounds lots are no longer required.