Oriental Harbor Investment Master Fund 13F: Exits ARM Stake

Oriental Harbor Investment Master Fund closed out its entire position in Arm Holdings plc (ARM) by selling all 150,573 shares it previously owned, according to a Form 13F filing with the SEC on October 22, 2026. The complete exit removes the fund from the chip designer's shareholder roster entirely after holding a prior stake of 150,573 shares. Arm shares closed at $210.10 on the day of the filing.

ARM Arm Holdings plc

$210.10 ▲ +83.13% year to date

1M 3M YTD

Daily close · Oct 22, 2026

Other Institutional Activity in Arm Holdings plc

Other institutional investors have also been actively adjusting their portfolios regarding the semiconductor firm. Proshare Advisors reduced its holdings by 37,986 shares, ending the period with 177,885 shares valued at about $78,224,928.75. Mirae Asset Global Etfs Holdings trimmed its stake by 88,838 shares to hold 116,595 shares worth roughly $47,548,606.67. Schonfeld Strategic Advisors took a different approach by opening a new position, picking up 345,322 shares valued at approximately $124,136,356.35. Bank of America cut back significantly by shedding 1,639,301 shares, leaving it with 706,252 shares worth about $253,883,476.72. Ami Asset Management dialed back its holdings by 1,959 shares, finishing with 60,908 shares worth approximately $17,642,695.

Arm Holdings plc Stock Down 5.0%

Arm shares recently traded around $210.09, remaining nearly equal to the closing price of $210.10 recorded on the October 22 filing date. The stock faces downward pressure compared to its moving averages and sits well below its 52-week high of $452.70, though it remains up substantially from its 52-week low of $100.02.

Recent Earnings

Arm Holdings plc generates revenue through the development and licensing of central processing unit intellectual property and related tools. The company is scheduled to report its next round of quarterly financial results on November 4, 2026.

Insider Buying and Selling at Arm Holdings plc

Company insiders executed several transactions prior to the filing. Officer William Abbey disposed of 6,566 shares on June 1, 2026, for a total value of $2,644,252. Officer Laura Kathleen Bartels parted with 11,306 shares at an average price of $392.70 on June 2, 2026, realizing $4,439,866. Chief Financial Officer Jason E. Child sold 10,400 shares at $255.33 on August 27, 2026, totaling $2,655,432, and later sold another 10,400 shares at $300.00 on September 21, 2026, for $3,120,000.

Analysts Set New Price Targets

Wall Street firms updated their views on the stock ahead of the filing. UBS maintained a buy rating while lowering its price target to $320.00 from $360.00 on July 30, 2026. Morgan Stanley kept an equal-weight rating while raising its target to $212.00 from $202.00 on the same day. RBC Capital maintained an outperform rating but cut its target to $340.00 from $475.00. TD Cowen kept a buy rating while lowering its target from $475.00 to $350.00. Rosenblatt maintained a buy rating on July 31, 2026, while adjusting its target down to $250.00 from $270.00.

About Arm Holdings plc

Based in Cambridge, United Kingdom, Arm Holdings plc designs and licenses foundational processor architectures and software used across the global technology and semiconductor industries. Its technology powers billions of devices ranging from smartphones to servers. Institutional portfolio shifts like this one provide a window into how major holders manage their exposure to the chip sector amid fluctuating market conditions.

Bottom Line

Investors tracking Arm will likely focus on the upcoming earnings report scheduled for early November 2026 for fresh insights into licensing revenue and growth. Additional institutional disclosures will reveal whether other large holders follow Oriental Harbor by exiting the stock entirely.