I'm glad to see the resumption of repurchases, if only to get an idea of Warren's estimate of IV. Now we get to see Greg's personal purchases as well. Greg's highest price paid yesterday was $733,300, or 1.47x Dec 31 BV (or maybe 1.45x today's BV if BV is growing 2.5% per quarter). If Berkshire bought at similar prices to Greg, then Berkshire paid as high as 1.45x today's BV. However, Warren has stated that he would not repurchase shares at a "mere" 5% discount to IV, so his IV estimate may be 1.45x BV/0.95, or 1.53x BV.

Based on yesterday's purchases and on Warren's statement that he wouldn't purchase above 0.95x IV, we can infer that Warren thinks that IV is 1.53x BV, or maybe a bit higher.