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Western Digital produces DRAM-based hard disk drives (HDDs). WDC's products are used in cloud and on-premises data centers, desktop & notebook PCs, enterprise storage, video surveillance, networking products, DVRs, point-of-sale devices, and set-top boxes. In May 2016, WDC acquired NAND flash leader SanDisk. In October 2023, WDC announced plans to unwind that acquisition and spin off the NAND flash business. That deal was concluded in February 2025, returning WDC to a pure-play HDD manufacturer.

Another week and another (fourth-consecutive) set of positive insider-sentiment data from Vickers Stock Research. Let's jump right in, looking at exchange data. Vickers' NYSE One-Week Sell/Buy Ratio is currently 1.44 on a scale where any result below 2.00 is bullish. This ratio has been bullish for four weeks in a row. The ongoing strength in the one-week data has now also pushed Vickers' longer-term (eight-week) sentiment reading into bullish territory. Indeed, the NYSE Eight-Week Sell/Buy Ratio is now bullish at 1.83. Turning to the Nasdaq, the One-Week Sell/Buy Ratio is essentially flat with last week at 2.67, which is just into the neutral zone (which runs from 2.00 to 6.00). Still, the short-term Nasdaq reading has been generally improving for multiple weeks and has led the Nasdaq Eight-Week Sell/Buy Ratio (currently 2.98) on a trend of improvement that is now 10 weeks in duration. Putting this all together, Vickers Total (all exchanges) One-Week Sell/Buy Ratio is now 2.05 (oh-so-close to bullish) and the Total Eight-Week Sell/Buy Ratio is now 2.34 (neutral but having improved for 10 consecutive weeks). When this run of bullish data began back on April 7, the S&P 500 was at 5062. On Friday, it closed at 5686, almost 12% higher. On a sector basis, insider buying narrowly exceeded selling in Consumer Discretionary last week, with shares valued at $6.44 million bought versus $6.42 million sold. Buying also outpaced selling in Energy -- although volume was light, with less than $1 million shares bought during the period. Selling was the greatest in the Financial sector over the last week, with shares valued at $73 million sold versus less than $4 million bought. Selling was also notable in Healthcare, Industrials, Real Estate, and Information Technology. This week, analysts at Vickers highlighted insider transactions of interest at Molina Healthcare Inc. (NYSE: MOH) and BlackRock Inc. (NYSE: BLK).

Western Digital is a leading, vertically integrated supplier of hard disk drives. The HDD market is a practical duopoly with, Western Digital and Seagate being the two largest players. Western Digital designs and manufacturers its HDDs, with much of the manufacturing and workforce located in Asia. The primary consumers of HDDs are data centers.

Seagate Technology Holdings provides hard disk drives (HDDs) for the personal computer, enterprise server, storage, retail, and consumer device markets. In December 2011, Seagate completed the acquisition of Samsung's HDD business for $1.4 billion in cash and stock. In calendar 2014, Seagate acquired Xyratex and LSI's SSD assets. In 2018, Seagate invested $1 billion in the Bain consortium to assure adequate NVM supply. Kioxia, the successor company to Toshiba Memory, has since bought out that investment, while retaining NVM supply agreements with Seagate.