RE: Drifting lower Not sure, whether this is by force, because there are not few sells into the BID with 500 shares only. Some days there are more, some days less.
Take a look at yesterday for example: https://de.advfn.com/p.php?pid=staticchart&s=TX^EOG&p=0&t=37&vol=1
Could be also that someboday is trying to keep the stock down. Just guessing ...
Cheers and have a good day,
Neo