With "mark" as the first part:
* Mark-up: An increase in price.
* Mark-down: A decrease in price.
* Mark-out: To outline or define a space.
* Mark-time: To stand in place with alternate stepping of feet.
* Mark-up: A markup or increase in price.
* Mark-down: A markdown or decrease in price.
With "mark" as the second part:
* Bookmark: A piece of paper used to keep a place in a book.
* Watermark: A design or inscription that is incorporated into paper during the manufacturing process.
* Trademark: A legally registered symbol or design used by a company to identify its products.
* Birthmark: A pigmented spot or patch on the skin present at birth.
* High-mark: The highest point or level.
* Low-mark: The lowest point or level.
* Target-mark: A mark that is aimed at.
Other compound words with "mark":
* Hallmark: A distinctive feature or characteristic.
* Landmark: A prominent feature or object in a landscape or a place of historical importance.
* Benchmark: A standard of measurement or comparison.
* Land-mark: A landmark.
* High-mark: The highest point or level.
* Low-mark: The lowest point or level.
* Book-mark: A bookmark.
This is not an exhaustive list, but it gives you a good starting point.