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
Settlement Date Short Interest Percent Change
Average Daily Share Volume Days to Cover
06/15/2021 3,829,663 (3.76) 1,921,877 1.99
05/28/2021 3,979,194 8.78 1,088,333 3.66
05/14/2021 3,657,890 (10.44) 1,698,826 2.15
04/30/2021 4,084,312 (6.75) 1,903,962 2.15
04/15/2021 4,379,822 12.23 1,667,048 2.63
03/31/2021 3,902,635 (5.58) 2,617,577 1.49
03/15/2021 4,133,061 14.86 5,481,436 1.00
02/26/2021 3,598,312 (10.65) 4,385,416 1.00
02/12/2021 4,027,269 19.56 9,495,725 1.00
01/29/2021 3,368,493 93.82 25,258,490 1.00
01/15/2021 1,737,934 (6.07) 11,980,144 1.00
12/31/2020 1,850,322 27.48 3,820,436 1.00
12/15/2020 1,451,407 (26.17) 2,633,356 1.00
11/30/2020 1,965,979 138.94 13,860,080 1.00
11/13/2020 822,783 (47.96) 2,238,066 1.00
10/30/2020 1,581,011 (29.61) 5,665,650 1.00
10/15/2020 2,246,184 624.75 41,389,728 1.00
09/30/2020 309,926 199.68 2,860,482 1.00
09/15/2020 103,420 (65.33) 637,204 1.00
08/31/2020 298,266 (54.81) 2,188,405 1.00
08/14/2020 660,019 321.87 5,258,485 1.00
07/31/2020 156,449 311.10 1,813,641 1.00
07/15/2020 38,056 (85.01) 754,384 1.00
06/30/2020 253,864 139.33 4,407,617 1.00
06/15/2020 106,071 17.24 2,452,651 1.00
05/29/2020 90,470 (42.98) 597,175 1.00
05/15/2020 158,661 (17.55) 937,638 1.00
