Wiktionary
n. (top-up English)
Wikipedia
In business, a top-up is a variation of a company’s stock repurchase program for common shareholders. Although this buyback reduces voting interest of its shareholder, the shareholder may subsequently increase its holdings, called a top-up.
For example, if company A holds 20% of voting power, and company B reduces this power to 10%, company A may increase its voting power to 15% within 6 months.
Usage examples of "top-ups".
There would be no rest on the next dark, for apart from infrequent top-ups taken from the wild-grown hydride cells which they would carry with them, the riders would not find food again until they reached the far side of the Wilderness.
The six-monthly top-ups produced nothing at all, and after three years he was graded Persil: investigated in depth and found to be of no intelligence interest.