Lam Research (NASDAQ:LRCX) shares are up 7.43% in today’s regular session, trading at $198.96 as of 1:15 PM ET. The catalyst came late Thursday, Nov. 5, when Lam Research announced a new $25 billion buyback authorization. The announcement followed a sharp selloff in semiconductor stocks, as Benzinga reported. For ETF investors, the move matters because Lam ranks among the larger positions in the most widely held chip and tech funds.

Lam makes the equipment chipmakers use to manufacture semiconductors, including deposition, etch, and clean tools. A buyback authorization lets the company repurchase its own shares over time. It does not require Lam to buy any shares, and the program can be suspended. Before this announcement, Lam had $3 billion remaining under its prior authorization at the end of the September quarter. It spent approximately $1 billion on repurchases in that quarter through an accelerated share repurchase that management said will keep executing in December. The long-term goal is still to return 85% of free cash flow to shareholders.

A Bounce After a Steep Slide

Today’s gain comes after a steep fall. Lam shares are down 21.79% over the past week and 40.41% over the past month. One session of buying is not a trend reversal.

Strong results could not stave off the selloff. In the fiscal first quarter, revenue reached $8.22 billion, up 54.4% year over year. Non-GAAP EPS of $2.20 beat the $2.1771 estimate, and free cash flow hit a record $3.24 billion. For the December quarter, Lam guided to revenue of about $8.60 billion, plus or minus $400 million, and non-GAAP EPS of $2.33, plus or minus $0.15. The latest quarterly dividend was $0.33, up from $0.26.

Which ETFs Hold the Most Lam Research

The figures below come from each fund’s regulatory holdings report dated June 30, 2026. That keeps the weights on the same date and makes them comparable.

Fund Holdings Date Lam Weight Lam Position Fund Net Assets VanEck Semiconductor ETF (NASDAQ:SMH) June 30, 2026 5.31% $4.10 billion $77.20 billion Technology Select Sector SPDR Fund (NYSEARCA:XLK) June 30, 2026 3.02% $3.74 billion $123.91 billion Invesco QQQ Trust (NASDAQ:QQQ) June 30, 2026 2.35% $11.50 billion $490.10 billion

SMH has the biggest weighting. Based on its June 30 weight, Lam’s gain today would add about 0.4 percentage points to the fund’s return. It is only a rough estimate. The same math gives about 0.2 points for both XLK and QQQ. Lam’s price has moved sharply since June, so its current weights in these funds probably differ from the table.

QQQ’s Lam stake is the largest in dollars, at $11.50 billion. Lam is a smaller share of that fund because QQQ is so much larger.

Concentration and Overlap Risk for Retirement Savers

In semiconductor funds, a small group of companies drives results. In the VanEck Semiconductor ETF’s June 30 report, each of the 10 largest holdings made up at least 5.04% of net assets, and the top position alone was 17.55%. Several of those top 10 names are chip-equipment makers, Lam among them. That suggests a selloff in equipment stocks can weigh on the fund even when chip designers hold up.

The bigger issue for index investors is overlap. Lam appears in all three funds above. The same chip and chip-equipment names show up in the sector fund, the Nasdaq-100 fund, and the dedicated chip fund. Owning a chip ETF alongside a tech or Nasdaq-100 fund means holding many of the same companies more than once.

In a month like this one, that increases exposure to the decline in those names. At each quarterly rebalance of the Nasdaq-100, no single issuer can exceed 24% of the index. That cap covers one company at a time. It does not limit the index’s concentration in a single industry.

What to Watch Next

The rate at which Lam actually uses the new authorization will show whether the buyback supports the stock or simply signals confidence. Watch for China’s share of revenue. It was 35% in the September quarter, and management expects it to be significantly lower in the December quarter. Also watch whether supply chain constraints continue to hold back shipments. Fund investors can check updated holdings reports to see how far Lam’s weight has shifted since June.

Disclaimer:This article represents the opinion of the author only. It does not represent the opinion of Webull, nor should it be viewed as an indication that Webull either agrees with or confirms the truthfulness or accuracy of the information. It should not be considered as investment advice from Webull or anyone else, nor should it be used as the basis of any investment decision.