GRACE W R & CO DEL NEW

CUSIP: 38388F108 Class: COM

TETRAD CORP's Holding History (CIK: 0000883597)

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

Q1 2008
Shares 500,000 Value ($000) $11,410 Avg Close — Range —
Q4 2007
Shares 500,000 Value ($000) $13,090 Avg Close — Range —
Q3 2007
Shares 445,200 Value ($000) $11,958 Avg Close — Range —
Q2 2007
Shares 113,000 Value ($000) $2,767 Avg Close — Range —
Q1 2007
Shares 77,000 Value ($000) $2,034 Avg Close — Range —
Q4 2006
Shares 77,000 Value ($000) $1,525 Avg Close — Range —