ESI is a pioneer and premier provider of photonic systems for microengineering and inspection applications on a world-wide scale. These laser-based systems optimize device features at the submicron level and are used in high-volume production environments.

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All investments involve risks, including the loss of principal. Securities trading offered through Robinhood Financial LLC, [Member SIPC ](https://www.sipc.org/) and a registered broker-dealer.

All investments involve risks, including the loss of principal. Past performance is no guarantee of future results. The provision of this information does not constitute investment advice or a recommendation of any security, transaction, account type, investment strategy involving securities, or order. Securities trading offered through Robinhood Financial LLC, [Member SIPC](https://www.sipc.org/), a registered broker-dealer, and a subsidiary of Robinhood Markets, Inc.

Options trading entails significant risk and is not appropriate for all investors. Options transactions are often complex and may involve the potential of losing your entire investment. Investors should consider their investment objectives and risks carefully before investing in options. To learn more about the risks associated with options, please read the [Characteristics and Risks of Standardized Options](https://cdn.robinhood.com/assets/robinhood/legal/Characteristics%20and%20Risks%20of%20Standardized%20Options.pdf) before you begin trading options. Supporting documentation for any claims, if applicable, will be furnished upon request.

Please also be aware of the risks listed in the following documents: [Day Trading Risk](https://d2ue93q3u507c2.cloudfront.net/assets/robinhood/legal/RHF%20Day%20Trading%20Risk%20Disclosure.pdf) [Disclosure Statement](https://d2ue93q3u507c2.cloudfront.net/assets/robinhood/legal/RHF%20Day%20Trading%20Risk%20Disclosure.pdf) and [FINRA Investor Information](https://www.finra.org/investors/learn-to-invest/advanced-investing/purchasing-margin).

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The line chart allows you to select different time spans. Each time span plots a time interval. On the 1 day span and weekly span, there is additional logic to only show the interval when trades occur. This allows you to see when trading volume occurs during periods of slower activity like extended hours or thinly traded equities. The candlestick chart works in the same manner.

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Electro Scientific Industries

Why Robinhood?

About ESIO

ESI is a pioneer and premier provider of photonic systems for microengineering and inspection applications on a world-wide scale. These laser-based systems optimize device features at the submicron level and are used in high-volume production environments.

ESIO Key Statistics

Electro Scientific Industries

Why Robinhood?

ESI is a pioneer and premier provider of photonic systems for microengineering and inspection applications on a world-wide scale. These laser-based systems optimize device features at the submicron level and are used in high-volume production environments. Show more

ESIO Key Statistics

ESI is a pioneer and premier provider of photonic systems for microengineering and inspection applications on a world-wide scale. These laser-based systems optimize device features at the submicron level and are used in high-volume production environments.