When I run diligence on any business, I research the filings in the business's state of incorporation. Make sure you use the official state website vs. third party aggregators that usually charge stupid amounts of money.
Many states provide this service for free, but many charge for access. Sometimes, it's token ($1 per search), and in a few cases, it's several dollars.
In this case, I used the official website of the Texas Secretary of State: https://www.sos.state.tx.us/, and it cost one dollar.
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