If my PI received research grants from a company to be able to pay my postdoc salary, did I have a potential conflict interest too? I was a postdoctoral fellow at a university and received nothing but the regular postdoc salary. I received no grants myself, but worked on various projects, many of which happened to be industry sponsored. My PI disclosed them as sources of potential conflicts of interest, but I never did. Assuming that my position couldn't exist without the industry research grants received by my PI, did receiving money from a company, although indirectly, generate a potential source of a conflict of interest for me?

Edit: Just to clarify, I am not interested in how to disclose/report this financial relationship, but in the ethical repercussions.
Yes, this is a potential conflict of interest. You specifically refer to working on industry-sponsored projects in addition to your salary being paid by an industry sponsor (even if indirectly): both can be perceived as conflicts.

Since your position is contingent on the industry funds, it would be possible for you to lose your position if the sponsor was unhappy with the results you produced.

That doesn't mean your work is by rule dishonest or tainted, but it means that for people to properly interpret the meaning of your work they should be aware of how you were funded: that's the purpose of conflict of interest disclosure.  You aren't saying that the work was unethically influenced, but you are allowing others to make that determination on their own.

As @BrianBorchers pointed out in a comment, the importance of this particular conflict depends on the rules for reporting conflicts of interest in whatever context you are talking about. In general, though, it's better to err on the side of disclosure.

To clarify further, if you are asking whether you are legally required to declare a conflict (for example, to abide by US federal law) then your question is probably off-topic for this site and you should instead be consulting with staff and training materials at your university that determine what is a reportable conflict of interest. My answer should be interpreted according to the question you asked, which is whether you had a potential conflict of interest.



In response to your edit, and your comment that indicated you weren't aware of exactly where your funding was coming at the time: I think you can relax a bit and not worry too much about this potential conflict, as long as when you present your research either in talks or in published work that you make sure it is clear that the work itself was funded by an industry sponsor, even if no improper behavior actually occurred. I would definitely put it in a disclosure slide if you are talking about work related to the company that funded you and the work. If you are talking about anything unrelated to that project then I see no need to disclose: you have no continuing ongoing financial interest and there is no conflict of interests on an unrelated project.