Boston Partners Investment Activity in Q2 2026

Boston Partners has reported significant changes to its portfolio during the second quarter of 2026. The investment firm demonstrated notable buying activity, particularly acquiring substantial stakes in major companies like Amazon (AMZN) and Southern Co. (SO), alongside other significant investments. Conversely, the firm also showed considerable selling activity, notably reducing its positions in stocks like Micron Technology (MU) and Marvell Technology (MRVL).

The most dramatic increase occurred in Amazon, where Boston Partners added over 7.4 million shares, representing a staggering 136% rise from the previous quarter. This suggests strong confidence in Amazon's long-term prospects or perhaps an opportunity to acquire shares at favorable prices during this period.

Elsewhere, Southern Co. saw a massive 15069% increase in holdings, indicating either a very small position previously that was significantly expanded or potentially a data anomaly given the enormous percentage change relative to its portfolio allocation of just 0.53%. Similarly, Capital One (COF) and other companies listed as significant buys likely experienced substantial increases in share count or value.

Beyond these headline moves, Boston Partners also engaged in buying activities involving NVIDIA (NVDA), Zebra Technologies (ZBRA), and Booking Holdings (BKNG). These purchases, along with the significant additions to Amazon and Southern Co., show a clear pattern of capital inflow into specific sectors during Q2 2026.

The selling side saw Boston Partners exit positions in several stocks. The most notable sale was Micron Technology, where holdings were reduced by over half (57.1%) from the previous quarter. Similarly, Marvell Technology saw a significant reduction of about 71.6% (-4413895 shares). Other companies sold included Check Point Software (CHKP), Jamstack Lending (JBL, though sector is missing in data) and possibly others not fully detailed here.

In terms of portfolio allocation shifts during the quarter, Boston Partners appears to be strategically adjusting its holdings. The firm's focus on Technology remains strong despite some sales, as evidenced by the continued high allocation percentages for companies like Applied Materials (AMAT) and others listed in top holdings with unchanged or stable allocations. The overall portfolio structure reflects these significant buying and selling decisions.