In 2015, LEGO released 7 Speed Champions sets across 3 subthemes, all of these sets have been retired. Subthemes for that year included Ferrari, McLaren, and Porsche. For that year, the total price of all retail sets cost $240, today those sets are valued around $957, a growth of 299%.
Most valuable 2015 LEGO Speed Champions set
75913 F14 T & Scuderia Ferrari Truck $306.62
Highest growth 2015 Speed Champions set
75909 McLaren P1 +467.04%
7 sets

75899 LaFerrari

Theme / Subtheme Speed Champions / Ferrari
Year 2015
Pieces / Minifigs 164 / 1
Availability Retired
75899 LEGO Speed Champions LaFerrari
Retail $14.99
Value $81.44
Growth  +443.3%
Annual growth 8.7%

75908 458 Italia GT2

Theme / Subtheme Speed Champions / Ferrari
Year 2015
Pieces / Minifigs 153 / 1
Availability Retired
75908 LEGO Speed Champions Ferrari 458 Italia GT2
Retail $14.99
Value $69.98
Growth  +366.8%
Annual growth 9.0%

75909 McLaren P1

Theme / Subtheme Speed Champions / McLaren
Year 2015
Pieces / Minifigs 168 / 1
Availability Retired
75909 LEGO Speed Champions McLaren P1
Retail $14.99
Value $85.00
Growth  +467.0%
Annual growth 10.1%

75910 Porsche 918 Spyder

Theme / Subtheme Speed Champions / Porsche
Year 2015
Pieces / Minifigs 151 / 1
Availability Retired
75910 LEGO Speed Champions Porsche 918 Spyder
Retail $14.99
Value $77.90
Growth  +419.7%
Annual growth 9.9%

75911 McLaren Mercedes Pit Stop

Theme / Subtheme Speed Champions / McLaren
Year 2015
Pieces / Minifigs 332 / 3
Availability Retired
75911 LEGO Speed Champions McLaren Mercedes Pit Stop
Retail $29.99
Value $147.50
Growth  +391.8%
Annual growth 9.2%

75912 Porsche 911 GT Finish Line

Theme / Subtheme Speed Champions / Porsche
Year 2015
Pieces / Minifigs 551 / 4
Availability Retired
75912 LEGO Speed Champions Porsche 911 GT Finish Line
Retail $49.99
Value $188.72
Growth  +277.5%
Annual growth 8.8%

75913 F14 T & Scuderia Ferrari Truck

Theme / Subtheme Speed Champions / Ferrari
Year 2015
Pieces / Minifigs 884 / 6
Availability Retired
75913 LEGO Speed Champions F14 T & Scuderia Ferrari Truck
Retail $99.99
Value $306.62
Growth  +206.7%
Annual growth 6.3%