I think I would want to explore the specific facts here in more detail. An LLC is free to change membership. If the other company is a member of your LLC, you really do not have any authority over who from that entity can speak on its behalf unless this was some kind of contractual obligation which I highly doubt, but I really would want to make sure I am understanding everything.
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When in doubt, refer to the Operating Agreement. If the other 49% member is an LLC, then an authorized representative can request financial and confidential information. Just make sure it is an authorized representative. Get it in writing. You owe the LLC member a duty to provide information upon request and they owe you a duty to conduct themselves in the best interest of ABC LLC.
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My colleagues comments are on point. I would ask for a proof/evidence as to the ownership of the 49% member. Clearly there should be an Operating Agreement that they could show you as well as an officer's certificate attesting to the validity of the document presented. Put the onus on them to establish who is the appointed "Member Representative" with authority delegated by the LLC to such named person for all matters in regard to the investment in your LLC. How about some Resolutions to show you, etc. In addition, even if arguably not necessary, it still may be in your best interest to make someone sign a confidentiality agreement that is tailored specifically to the information you disclose to them (if you ultimately decide you will or have to). You may find out in your course of dealing that there is a dispute in the other LLC and it may be about "value" of the 49% interest in your LLC and what it means to the disgruntled member seeking information to evaluate what the investment is worth....so I am saying you may amidst a squabble here so be careful lest you get sucked into someone else's mess. Good luck to you.
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