A big auction held in Amelia Island, Florida this weekend earned $99 million in sales but failed to sell the top car of the event, which could be a sign of a slowing collectible car market.

More than 230 cars were sold at auction this weekend during the 2015 Amelia Concours d'Elegance, with an average sale price of $402,777 per car, according to classic-car insurance company Hagerty. The total of $99.1 million easily surpassed 2014's total of $66.9 million, but 73 more cars were sold this year.

Though 89 percent of the 269 lots were sold, the top car of the RM Auction, a 1956 Maserati 200 SI didn't even meet its reserve price of $4.7 million, according to CNBC. The car was expected to go for $5 million to $10 million.

A 1963 Mercedes-Benz 300 SL Roadster and 1973 Porsche 911 Carrera RS Sport expected to go for more than a million failed to sell as well.

At least some of the vehicles sold in private deals after the auction took place.

"The final sales results exceeded our presale predictions by 5 percent despite a couple of the potential top sellers not finding a new home," said McKeel Hagerty, CEO of Hagerty, who spoke with CNBC.

The top 10 sellers at the RM Auction by price and company include:

1. 1960 Ferrari 400 Superamerica SWB Cabriolet- $6,380,000

2. 1955 Jaguar D-Type roadster- $3,740,000

3. 1972 Ferrari 365 GTS/4 Daytona Spyder- $3,300,000

4. 1967 Ferrari 275 GTB/4 Coupe- $3,300,000

5. 1935 Mercedes-Benz 500/540K Cabriolet- $3,025,000

6. 1931 Alfa Romeo 6C 1750 Gran Sport Spider- $2,420,000 

7. 1938 Bugatti Type 57C Aravis Cabriolet- $2,337,500

8. 1971 Lamborghini Miura P400 SV Coupe- $2,310,000

9. 1988 Jaguar XJR-9 Coupe- $2,145,000

10. 1967 Shelby Cobra 427 S/C Roadster- $2,117,500 

In total, 325 vehicles were on display for nearly 30,000 attendees to check out during the 2015 Amelia Island Concours d'Elegance.

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