Historic short interest:
You can go to this link to check short interest in a stock:
http://nasdaqtrader.com/Trader.aspx?id=ShortInterest
Publication schedule is here:
http://nasdaqtrader.com/Trader.aspx?id=ShortIntPubSch
(I like to keep this posted on a stock I follow because NASDAQ only keeps 12 months. If anyone has older data it would be interesting to see)
Settlement Date Short Interest Percent Change Average Daily Share Volume Days to Cover
07/15/2020 32,653,635 7.96 3,147,715 10.37
06/30/2020 30,244,846 16.05 4,440,585 6.81
06/15/2020 26,061,751 (4.32) 4,444,238 5.86
05/29/2020 27,239,015 2.76 10,723,636 2.54
05/15/2020 26,507,994 23.82 8,097,608 3.27
04/30/2020 21,408,484 (8.34) 5,552,583 3.86
04/15/2020 23,356,262 (7.02) 3,908,466 5.98
03/31/2020 25,118,416 (2.07) 8,103,375 3.10
03/13/2020 25,648,785 7.73 5,206,303 4.93
02/28/2020 23,809,064 (7.08) 8,945,089 2.66
02/14/2020 25,622,422 (0.08) 5,286,567 4.85
01/31/2020 25,642,035 25.93 7,272,759 3.53
01/15/2020 20,362,771 (24.28) 6,731,086 3.03
12/31/2019 26,890,498 0.13 5,435,540 4.95
12/13/2019 26,855,728 (2.10) 17,911,481 1.50
11/29/2019 27,431,603 1.85 16,550,496 1.66
11/15/2019 26,932,138 22.53 12,804,991 2.10
10/31/2019 21,979,837 2.21 3,916,605 5.61
10/15/2019 21,503,874 3.58 3,126,971 6.88
09/30/2019 20,761,101 (6.58) 4,819,292 4.31
09/13/2019 22,223,363 6.11 3,109,896 7.15
08/30/2019 20,943,066 19.86 3,063,310 6.84
08/15/2019 17,473,086 82.03 6,821,417 2.56
07/31/2019 9,599,270 (14.21) 2,124,097 4.52
07/15/2019 11,189,700 7.35 1,579,277 7.0