Primecap Management Co/Ca/ Portfolio Shifts: Key Technology Buys and Sells in Q2 2026
Primecap Management Co/Ca/'s portfolio experienced notable changes this quarter, marked by significant increases in positions like KLA Corp (KLAC) while seeing substantial decreases in holdings such as Micron Technology (MU).
As of June 30th, 2026, Primecap Management Co/Ca/ has shown active buying and selling patterns within its portfolio. The fund's overall composition reflects these changes through adjustments in specific stock positions.
Prominent Purchases This Quarter
Primecap Management Co/Ca/ demonstrated significant buying activity, most notably increasing its stake in KLA Corp (KLAC). The fund acquired a substantial number of shares during this period, resulting in a portfolio allocation increase from an unknown previous level to 3.66%. This large purchase is highlighted by the 742% change in KLAC's share count since the prior reporting period.
In addition to KLA Corp (KLAC), Primecap Management Co/Ca/ also boosted its position in Boston Scientific Corporation (BSX). The fund increased its holdings of BSX significantly, with a buy percentage increase of 55.31% over the quarter. Furthermore, the investor added positions to American Airlines Group Inc. (AAL) and Ericsson Ltd. (ERIC), although these additions represented smaller portfolio percentages.
The fund also purchased shares in other companies like Allogene Therapeutics Inc. (ALLO) and First Horizon Corporation (FHN). These purchases, while adding new names to the portfolio or increasing existing ones, were generally less significant than the major stake increase seen in KLAC.
Notable Sales This Quarter
The most striking change for Primecap Management Co/Ca/ was the substantial reduction in its position of Micron Technology Inc. (MU). The fund sold off a considerable portion of its MU holdings, decreasing total shares by 12.15% and reducing portfolio allocation from 13.12% to an unknown lower level.
Another significant sale occurred with FLEX Ltd. (FLEX), which saw Primecap Management Co/Ca/ reduce its stake by approximately 7.98%. The fund sold shares in this company, leading to a decrease in portfolio allocation from 2.24%. Additionally, the investor completely exited its position in ZoomInfo Technologies Inc. (ZI) through substantial selling.
The sales activity also included reductions in other holdings like Intel Corporation (INTC), NVIDIA Corporation (NVDA), and Amazon.com Inc. (AMZN). While these decreases were less dramatic than those from MU or FLEX, they still represent noteworthy exits for the fund during this period.
Other Portfolio Activity
Beyond the major buys and sells highlighted above, Primecap Management Co/Ca/ made several other adjustments to its portfolio. The investor sold shares in BIOGEN INC (BIIB) and AMAZON COM INC (AMZN), although these were less significant than the exits from MU or FLEX.
Conversely, purchases were also noted for companies like BOSTON SCIENTIFIC CORP (BSX), AMGEN INC (AMGN), and ALLOGENE THERAPEUTICS INC (ALLO). These additions reflect ongoing portfolio management activities focused on various sectors including Healthcare and Technology.
It's important to note that the data provided only reflects observable changes through holdings reporting. Primecap Management Co/Ca/ may have made other smaller purchases or sales not disclosed in this filing, which would fall under the category of "No such activity is disclosed in this filing."