I don’t have access to that theme, and can’t say with 100% certainty, but I think where you’re trying to get the field is outside the loop.
My guess is that the post loop is actually in whatever file or code is loaded by this line.
<?php echo $td_mod_single->get_content(); ?>
Either that or there isn’t a real loop for this theme. Some theme authors do things in incorrect ways. It is possible to get the current post id without having a loop, but without having a loop you must always supply the post id because without it WP and ACF won’t figure it out for you.
Anyway, you can try this.
<?php
$queried_object = get_queried_object();
the_field('company_name', $queried_object->ID);
?>
