[8] In April 1987 its subsidiary, Shamrock Holdings of California, purchased a controlling interest in DBMS Inc. of Naperville, Ill., a software systems and services company.

[9] After the management team of Holly Sugar submitted a plan to take the company private, two shareholders - Shamrock (5.5%) and Brookehill Equities (11.8%) - filed separately with the SEC with the intent to possibly make a counter offer.

[10] In fall 1987, Central Soya, a soybean processor, was sold by Shamrock to Ferruzzi Group of Italy, making a profit of $125 million.

In December 1987, the corporation attempted a buyout of Wherehouse Entertainment, who avoided the takeover by agreeing to be bought by Adler & Shaykin, a New York investment firm.

Instead, Shamrock purchased Music Plus from Show Industries in April 1988 to begin its move into home entertainment retailing.

[11] In 1988 and 1989, it pursued Polaroid, ultimately failing to take over the company but winning concessions such as an advertising deal for its television stations.

[17] From 2003 to 2005, Shamrock was an instrumental force in the SaveDisney campaign and the ouster of Michael Eisner as CEO of The Walt Disney Company.

[20] Shamrock Holdings' Capital Growth Fund purchased an 80% stake in the Harlem Globetrotters in September 2005 with the intent to increase merchandising and other income.

[citation needed] In October, Shamrock Activist Value Fund sued iPass Inc., a SH holding, to turn over boardroom records over failure to fire their CEO and mismanagement of a takeover.

[22] In March 2007 the corporation's Capital Growth Fund invested $50 million into Real D company, a 3D movie equipment manufacturer.

[citation needed] In June 2020, Shamrock acquired the advertising trade publication Adweek from Canadian private equity firm Beringer Capital.

[36] Trefoil Investors II is an investment company of Roy Disney and other senior executives of Shamrock Holdings Inc.

In October 1994, Trefoil Investors II purchased a significant stake in Fantastic Foods Inc., a natural-foods company with annual revenues nearing $30 million on Nature's Burger hamburger alternative and instant soups and mixes.