The main benefit to owning stocks is to gain value from a company growing its business. But some stocks offer side benefits in the form of shareholder perks.

Perks can range from discounts on products the company sells to free services. Some perks only require shareholders to have at least other share. Others have a higher minimum holding requirement. While perks should not be the sole reason to own a stock, they are an attractive benefit to many shareholders.

Here are four U.K. companies with substantial shareholder perks:

Carnival Corp.

Carnival Corp. (LON: CCL) offers shareholders who hold at least 100 shares onboard credit when they travel on the American-British cruise lines. (See also: Why Carnival Has Been Successful.)

Those traveling 14 days or longer get $150 British pounds per stateroom toward onboard credit on U.K. cruise line brands P & O Cruises and Cunard. Those traveling 7 to 13 days get $60 British pounds of credit, and those traveling less six days get $30 British pounds in credit.

Carnival shares were up 31.5 percent the past year, as of Sept. 29.

InternContinental Hotels Group

InterContinental Hotels Group plc (LON: IHG) celebrates shareholders with discounts on hotel says through a controlled access website. Discounts vary according to availability.

Headquartered in Denham, U.K., the company has more than 5,170 hotels in 100 countries. Its brands include hotels like Holiday Inn, Holiday Inn Express, Staybridge Suites, Intercontinental Hotels & Resorts and Candlewood Suites.

InterContinental shares are up about 10 percent in the past year, as of Sept. 29, 2017.

Mulberry Group

Mulberry Group plc (LON: MUL) shareholders can also get a 20 percent discount on up to $5,000 British pounds worth of merchandise. But they must present their discount card. And to get a discount card, customers must have at least 250 shares in the company.

Based in Somerset, England, Mulberry is a luxury fashion company known for its leather handbags that typically cost more than $1,000 British pounds. Shares of Mulberry are trading at about that same price ‒ above $1,000 British pounds in recent sessions.

That means shareholders can get a $200 discount as a perk, but they must have more than a $250,000 stake in the company.

Mulberry Group shares are up 4.4 percent the past year.

Moss Brothers Group

Owning just one share of Moss Brothers Group (LON: MOSB) allows the shareholder to receive a 20 percent discount on purchases.

The London-based retailer provides formal wear for men, offering suits, jackets, coats, ties and trousers as well as casual wear. Three-piece suits range from about $100 to $300 British pounds. With 125 stores throughout the U.K, its third-party brands include Hugo Boss, Ted Baker, NKNY, Canali and French Connection.

Moss Brothers recently reported same store sales for the first half of 2017 increased 2.8 percent as pre-tax profit increased 15.7 percent. In the past year, Moss Brothers shares declined 7 percent, as of Sept. 29, 2017.

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