You may trust them today, but what happens if one of them gets hit by a car or gets into a fight with you. Or if one of them divorces and his wife claims he owns more of the company because your shares are not shown?
You need to document the agreement and get shares issued.
In addition, company should be having board and shareholder meetings that you attend and get minutes from. These minutes should also reflect your status.
Sit down with your partners and get the corporation properly documenting agreements or you and it could have real problems.
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There's no reason not to put this partnership agreement in writing. If you don't, you may have to enforce an roal agreement, supported by emails and proof of performance and lots of "he said, she said" testimony, and your recollections and understandings of things may be very different from those of your partners.
Moreover, in CA, an oral contract only gives you 2 years from the date of breach to enforce it with a lawsuit, while a written contract not only spells out everything and goes a long way in avoiding potential misunderstandings, but also gives you 4 years fronm the date of breach oto sue if you have to.
See a business lawyer for help to make sure your company is structured right and you follow all the rules that apply to it and to ensure that you have an enforcebale contract. 2 years pf work is a lot to invest without some legal protection.
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Aside from the applicable statute of limitation issues of 2 years on an oral contract and 4 years on an written contract, your question does not make it clear what type of entity is involved. You indicate your colleagues are partners indicating a partnership, but you also indicate you have been promised shares indicating a corporate entity. Sounds like you definitely need to reduce things to writing and get a copy of the applicable entity agreements to make sure you take appropriate and enforceable actions. You should contact a business attorney in your vicinity to discuss.
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