Gran Tierra Energy Inc. (GTE)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Mason Hill Advisors Llc	3,390,114	$24,510,524	16.67%
2.	American Century Companies Inc	1,171,287	$8,468,405	0%
3.	Lm Asset (im) Inc.	1,096,589	$7,928,338	7.26%
4.	Ubs Group Ag	729,039	$5,270,952	0%
5.	Bridgeway Capital Management Inc	552,155	$3,992,081	0.08%