Update
The data were updated last night. There is a minor change in the total balance sheet, around -$5.5B.

2019-03-06:3,969,134
2019-02-27: 3,974,590
2019-02-20: 3,981,420
2019-02-13: 4,028,431
2019-02-06: 4,026,350
2019-01-30: 4,039,678