The most common and most likely answer to this crossword clue is the 8 letter word EQUITIES
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More clues leading to the result EQUITIES
Buddy explains!

The straight part
We know that "Shares" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shares = equities.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does EQUITIES mean?
EQUITIES noun- Fairness, impartiality, or justice as determined in light of "natural law" or "natural right".
- Various related senses originating with the Court of Chancery in late Medieval England
- Various senses related to net value