So let's use our crayons again
3/31/2016 2,790,941 387,570 7.201128
3/15/2016 3,275,303 786,528 4.164255
2/29/2016 3,351,869 517,311 6.479408
2/12/2016 3,296,512 1,167,248 2.824174
1/29/2016 2,970,306 828,118 3.586815
1/15/2016 3,167,934 2,532,059 1.251130
12/31/2015 2,735,608 2,441,362 1.120525
12/15/2015 3,154,419 2,304,913 1.368563
11/30/2015 2,644,088 8,471,719 1.000000
11/13/2015 2,303,738 7,321,149 1.000000
10/30/2015 2,085,698 1,219,686 1.710029
3.3 million is the highest number
12/14/2018 5,542,513 186,519 29.715541
11/30/2018 5,542,897 150,113 36.924830
11/15/2018 5,744,717 160,815 35.722520
10/31/2018 5,783,150 426,886 13.547294
10/15/2018 5,553,619 220,507 25.185681
9/28/2018 5,765,630 363,517 15.860689
9/14/2018 5,689,444 180,832 31.462595
8/31/2018 5,740,454 183,845 31.224423
8/15/2018 5,814,264 287,331 20.235422
7/31/2018 5,619,190 323,299 17.380784
7/13/2018 5,512,714 1,629,466 3.383141
6/29/2018 4,987,450 1,045,374 4.770972
6/29/2018 4,987,450 1,045,374 4.770972
6/15/2018 6,160,104 1,074,516 5.732910
5/31/2018 6,081,254 277,243 21.934743
5/15/2018 5,979,269 251,146 23.807940
4/30/2018 5,876,481 325,520 18.052596
4/13/2018 5,287,123 272,186 19.424669
3/29/2018 5,019,020 281,431 17.833927
3/15/2018 4,609,105 317,430 14.520067
2/28/2018 4,388,774 211,082 20.791797
2/15/2018 4,555,968 380,550 11.972061
1/31/2018 4,404,075 356,538 12.352330
1/12/2018 4,409,183 228,264 19.316156
4.4 is the lowest number, 6.1 is the highest, 5.6 is an approximate average for the last half of the year.
I don't believe that dilution has been more than 25% and I think that's being generous. If anyone has the exact figures handy please post them.
So shorts are currently 1.69 times the older time frame and dilution is an assumed 1.25 so shorts have increased faster than dilution.
Note that shorting increased substantially roughly 4/15 to 6/15 in the last half of the year. Volume was unusually high 6/15 to 7/15 with minimal covering, "churn" seems to be responsible for this. Before and after that time period daily volume is in a similar range, dropping even further at end of year. This indicates to me that there wasn't much tax loss selling.
The dramatic increase in short interest this year would support a theory that shorting interests expected additional dilution and it just didn't happen....
**** note, I prepared this post and then forgot to post it. It was written before Steady_T's comment on volume.