On registration of a vehicle, a registration mark comprising a number of not more than 4 digits with prefix letters, other than special registration mark, will be allocated. There are two types of vehicle registration marks. A special registration mark which is not transferable consists of any number alone or one or more letters as prefix and followed by a number listed under items 1 to 14 of the Schedule, other than a registration mark consisting of letters AM and LC. A non-special registration mark which is transferable is defined as a mark other than a special registration mark and mark consisting of letters AM and LC.
In 1973, legislation was introduced whereby vehicle registration marks could be purchased by auction. Any member of the public may attend an auction organized by the Department and bid for the target marks.
Application together with a refundable deposit of $1,000 maybe submitted to reserve any unassigned special or non-special mark from the old series of prefixes (e.g. AA, AB, HK, BE... etc.) to even the next series of prefix following the current series being issued to be put up for auction. Funds raised from the auction of vehicle registration marks after deduction of the operation expenses will go to the Hong Kong Government Lotteries Fund to be used for charitable purposes.
The ten highest prices of registration marks sold since our first vehicle registration mark auction in 1973 are listed here
| Vehicle Registration Mark | Date of Auction | Price (HK$) |
| 18 | 23 Feb 2008 | 16,500,000 |
| 9 | 19 Mar 1994 | 13,000,000 |
| 2 | 27 Feb 1993 | 9,500,000 |
| 12 | 20 Feb 2005 | 7,100,000 |
| 29 | 23 Feb 2008 | 7,000,000 |
| 33 | 21 Jun 1997 | 7,000,000 |
| 8 | 13 Feb 1988 | 5,000,000 |
| 7 | 21 Jan 1989 | 4,800,000 |
| 71 | 5 Feb 1994 | 4,000,000 |
| 17 | 13 Apr 1996 | 3,950,000 |
| 23 | 31 Jan 2004 | 3,900,000 |
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