3M Company

CUSIP: 88579y101 Class: COM

CHECK CAPITAL MANAGEMENT INC/CA's Holding History (CIK: 0001032814)

Note: Option positions (PUT/CALL) are excluded.

Q1 2016
Shares 1,527 Value ($000) $254 Avg Close — Range —
Q4 2012
Shares 59,494 Value ($000) $5,524 Avg Close — Range —
Q3 2012
Shares 61,725 Value ($000) $5,705 Avg Close — Range —