In 2010, LEGO released 6 Harry Potter sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Chamber of Secrets and HalfBlood Prince. For that year, the total price of all retail sets cost $341, today those sets are valued around $856, a growth of 151%.
Most valuable 2010 LEGO Harry Potter set
4842 Hogwarts Castle $253.74
Highest growth 2010 Harry Potter set
4736 Freeing Dobby +258.87%
6 sets

4736 Freeing Dobby

Theme / Subtheme Harry Potter / Chamber of Secrets
Year 2010
Pieces / Minifigs 73 / 3
Availability Retired
4736 LEGO Harry Potter Chamber of Secrets Freeing Dobby
Retail $10.99
Value $39.44
Growth  +258.9%
Annual growth 6.6%

4737 Quidditch Match

Theme Harry Potter
Year 2010
Pieces / Minifigs 153 / 5
Availability Retired
4737 LEGO Harry Potter Quidditch Match
Retail $19.99
Value $64.28
Growth  +221.6%
Annual growth 5.2%

4738 Hagrid's Hut

Theme Harry Potter
Year 2010
Pieces / Minifigs 442 / 4
Availability Retired
4738 LEGO Harry Potter Hagrid's Hut
Retail $39.99
Value $83.60
Growth  +109.1%
Annual growth 7.0%

4840 The Burrow

Theme / Subtheme Harry Potter / Half-Blood Prince
Year 2010
Pieces / Minifigs 568 / 6
Availability Retired
4840 LEGO Harry Potter Half-Blood Prince The Burrow
Retail $59.99
Value $197.37
Growth  +229.0%
Annual growth 8.4%

4841 Hogwarts Express

Theme Harry Potter
Year 2010
Pieces / Minifigs 646 / 5
Availability Retired
4841 LEGO Harry Potter Hogwarts Express
Retail $79.99
Value $217.55
Growth  +172.0%
Annual growth 6.2%

4842 Hogwarts Castle

Theme Harry Potter
Year 2010
Pieces / Minifigs 1,290 / 11
Availability Retired
4842 LEGO Harry Potter Hogwarts Castle
Retail $129.99
Value $253.74
Growth  +95.2%
Annual growth 5.7%