This is interesting because in this SEC generated graph the period of Nov '18 -> Jan '19 there is a gap in the data (neither price nor FTD shares appear).
I observed the absence of any FTD's of TSLA
at the time in the SEC reported data sets (because there didn't seem to be a way to get SEC generated graphs back then). It was so surprising compared to previous years that I wrote some software to scan the histories of all comparable volume stocks (~6000 companies with volume from 10 times less than TSLA up to any larger volume) to see if other actively traded stocks ever had similar long periods of no FTDs. It turned out that no other heavily traded stock ever had even 1/5 as long a period of no FTD reports. I actually wrote to the SEC about it because it seemed like it couldn't be true. They never responded to me. I'm guessing that this auto-generated graph queries the same data set, and when FTDs are (allegedly) zero, there is no entry and therefore also no price, So this creates a gap on the graph.
You can see for yourself that no other symbols have this gap behavior by choosing any (active volume) symbol and there will be no big gaps. e.g.
https://sec.report/fails.php?tc=AAPL has no gap in the Nov '18 -> Jan '19 time frame or any other time frame.
One thing you will see is that large spikes in FTDs are common with many other stocks, not just TSLA. But no others ever have a reporting gap.
So there is still the big question about what happened during November 2018 through January 2019 that magically caused TSLA to have no FTDs at all or, more likely, none were reported even though they existed. Did someone at the NSCC tweak the code that generates the report in order to hide something going on with TSLA and made a mistake that accidentally set it to zero?
edit: fixed messed up link.