Investors & landlords

I’m actually still trying to figure this out. I had bought a really small number of shares of ET that the number in 13K is a “1”. Does it mean $1 ? Is there any point for me to file Form 8990? And what information do I use to fill the rest of that form, because I have no idea what Tentative Taxable Income from Line 6 means on that 8990 form…