Kaarlo Viktor Holma was also known as Cajus. His mother was Anna af Enehjelm and father Anders Viktor Hellman, who in the beginning of the 1900s changed his last name into a more Finnish version, Holma. 

Cajus Holma was very ambitious and in 1911 he joined Ilmari Palmén to start a law practice that soon earned an excellent reputation in Helsinki for the quality of its work.

However, it soon became clear that pure advocacy was not enough for Cajus Holma. He got involved in the banking sector and in the spring of 1915 he was appointed as the managing director to one of the major banks in Finland, Säästöpankkien Keskus-Osake-Pankki.

When Ilmari Palmén decided to leave the firm in 1915, Cajus Holma offered partnership to his brother-in-law Henrik Wilhelm Borenius, whose sister, Anna Sofia Borenius, he had married. Henrik Wilhelm Borenius (1884 - 1962), referred to as Heikki Borenius Sr., accepted the offer and became a partner having already worked at the office during his studies.

In 1917, when Finland became independent, Cajus Holma sought his way into political life and served as the Chief Secretary at Regent Mannerheim’s civil office for six months. He was thereafter elected to the Parliament for 1919 - 1921. In 1921 - 1923, he served as Parliamentary Ombudsman. All these tasks occupied Cajus Holma’s time to such extent that he let Heikki Borenius Sr. take care of all practical work of the law firm.

After a career in banking and in politics, Cajus Holma returned to the firm in 1924 only to finally leave the firm to Heikki Borenius Sr. in 1930.

Cajus Holma continued his career as an in-house counsel for certain corporations, e.g. Suomen Puunvienti Oy and another one of Finland’s major banks at the time, Suomen Vienti-Pankki. In 1942, Cajus Holma also established another law office, in the middle of the Continuation War, this time in the city of Lahti.