What you are seeing probably understates the number of shareholders as it counts the shares held in street name at DTC as one position. In other words, if I am one of 50 or 100 people who owns NSAV in a Schwab account, that counts as "1 shareholder" on that report.
To get a true count of retail shareholders one has to pay to get a NOBO (notice of beneficial ownership) report - companies can do that, and do so on occasion, but this is usually only done in unusal circumstances.
You can be almost 100% certain that there are more than 194/197 individuals who own NSAV.