The plural form of the noun shareholder is shareholders.
The plural possessive form is shareholders'.
Example: The shareholders' votes are being counted.
The plural is inventories. The plural possessive is inventories'.
The plural form is treasurers. The plural possessive is treasurers'.
Taxes is the plural form of tax. The plural possessive is taxes'.
The singular possessive form of the noun cost is cost's.The plural form of the noun is costs.The plural possessive form is costs'.
The possessive form of the plural noun taxpayers is taxpayers'.The possessive form of the plural noun beneficiaries is beneficiaries'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural of senior is seniors. The plural possessive of seniors is seniors'
The singular possessive of "ant" is "ant's" and the plural possessive is "ants'".
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is stations. The plural possessive is stations'.
The plural is relatives. The plural possessive is relatives'.
The correct form is "its" for the possessive form in the plural. "Its" is used for both the singular and plural possessive forms, without an apostrophe.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.