Activist investor Carl Icahn reported a increased holdings in Navistar International Corp. (NAV) as of Sept. 30, according to a regulatory filing Thursday.

Mr. Icahn has increasingly influenced the commercial truck manufacturer. In July, Navistar reached an agreement with Mr. Icahn and Mark H. Rachesky that allows them to designate two board nominees for election in exchange for not launching a proxy contest, while also allowing them to increase their stakes in the company.

Mr. Icahn reported holding 13.3 million shares in Navistar as of Sept. 30, up 13% from the end of the previous quarter.

The investor, known for his highly public brand of shareholder activism, has been particularly busy lately. Other than his recent dealings with Apple Inc. (AAPL) and Netflix Inc. (NFLX), Mr. Icahn lost a high-profile battle against Dell Inc. (DELL) going private, but he still netted a profit in the process.

Mr. Icahn has been calling for Apple to boost its share-repurchase plan to $150 billion. The investor, who has talked and corresponded with Apple CEO Tim Cook about the buyback proposal, said last month he had boosted his stake in Apple to 4.73 million shares, or about 0.5%. As of the end of the third quarter, by comparison, Mr. Icahn had 3.9 million shares of Apple.

For Apple's part, Mr. Cook has said the company's leadership "greatly appreciated" suggestions from shareholders, adding that any changes to the company's cash-allocation plans wouldn't be announced until next year. The company in October said it had $146.8 billion in cash at the end of its fiscal fourth quarter.

Earlier this week, offshore drilling contractor Transocean Ltd. (RIG) announced it had reached an agreement with Mr. Icahn, saying it would shrink its board, propose a $3 a share dividend, and place its rigs in a master limited partnership and take it public. In a filing Tuesday, Mr. Icahn reported holding nearly 21.5 million shares of Transocean.

Mr. Icahn also reported an 5.5 million-share stake in Netflix as of Sept. 30. Last month, however, he sold more than half his stake in the video-streaming and rental company for nearly $1 billion. At the time, Mr. Icahn's investment firm, Icahn Enterprises LP (IEP) said it retained 2.66 million shares in Netflix, or a stake of about 4.5%.

Overall in the third quarter, the value of Mr. Icahn's holdings was up 14% to $24.6 billion from the previous period, according to the filing with the Securities and Exchange Commission.

Investors who manage more than $100 million are required to disclose most securities holdings within a month and a half of the end of a quarter; the third-quarter deadline was Thursday. The filings give the public a relatively fresh look at high-profile investors' portfolios.

Mr. Icahn often reports various holdings and divestitures in companies throughout the period between the required quarterly filings.

Write to Michael Calia at michael.calia@wsj.com

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