All four major indexes declined in the August 18, 2026 U.S. regular session, with the Nasdaq Composite and Russell 2000 each falling more than 1%. Among the tracked stocks, SanDisk, Micron, and Meta saw steep declines, while Apple rose against the broader market weakness, creating a wide gap in individual stock performance.

Nasdaq and Russell 2000 close down more than 1%

All figures below are U.S. regular-session closing data for August 18, 2026. Index levels and day-over-day changes are in points, while percentage changes are in %.

Major index August 18, 2026 close (points) Change from prior day (points, %)
S&P 500 7,691.76 -53.30(-0.69%)
Nasdaq Composite 26,289.71 -355.20(-1.33%)
Dow Jones 53,343.40 -116.38(-0.22%)
Russell 2000 3,017.89 -39.65(-1.30%)

On August 18, 2026, the S&P 500 closed at 7,691.76 points, down 53.30 points, or 0.69%. The Nasdaq Composite fell 355.20 points, or 1.33%, to 26,289.71 points, the largest percentage decline among the four major indexes. This can be confirmed in the S&P 500 closing data and Nasdaq Composite closing data.

The Dow Jones finished August 18, 2026 at 53,343.40 points, down 116.38 points, or 0.22%. The Russell 2000 fell 39.65 points, or 1.30%, to 3,017.89 points on the same trading day. Closing data directly show that the large-cap-focused Dow Jones declined relatively less, while the tech-heavy Nasdaq Composite and small-cap Russell 2000 posted larger losses. Dow Jones closing data Russell 2000 closing data

SanDisk and Micron losses exceeded the index declines

SanDisk closed at $1,625.78 in the August 18, 2026 regular session, down $161.07, or 9.01%, from the prior trading day. Its intraday high was $1,724.99, its low was $1,600.20, and volume was 17,991,792 shares. It had the largest absolute percentage move among the tracked stocks that day. Historical analysis is available through the SanDisk closing data and SanDisk stock hub.

Micron closed at $940.76 on August 18, 2026, down $70.99, or 7.02%. Its intraday low was $926.64 and volume was 36,640,946 shares on the same trading day. The declines in SanDisk and Micron exceeded the Nasdaq Composite’s 1.33% decline on the same day. See the Micron closing data and Micron stock hub.

Nvidia also closed at $219.74 on August 18, 2026, down $5.27, or 2.34%. Volume was 102,376,166 shares, and its intraday low was $218.69. The three stocks’ simultaneous declines are visible in their closing data for that trading day, but their concurrent closing moves alone do not establish that a particular sector-related factor was the cause. Individual records are available through the Nvidia closing data and Nvidia stock hub.

Meta plunges while Apple rises

Meta finished the August 18, 2026 regular session at $543.67, down $25.30, or 4.45%. Its intraday high was $560.66, its low was $543.21, and volume was 26,550,374 shares. Meta’s decline exceeded the S&P 500’s 0.69% decline and the Nasdaq Composite’s 1.33% decline on the same trading day. Previous analysis is available through the Meta closing data and Meta stock hub.

By contrast, Apple closed at $310.03 on August 18, 2026, up $4.44, or 1.45%. Its intraday high was $311.49 and volume was 46,601,840 shares. Microsoft and Alphabet closed at $481.63, up $1.28, or 0.27%, and $344.20, up $0.20, or 0.06%, respectively. Apple closing data Apple stock hub Microsoft closing data Microsoft stock hub Alphabet closing data Alphabet stock hub

Amazon stood at $259.45 on August 18, 2026, down $1.86, or 0.71%, while Tesla finished at $336.87, down $2.43, or 0.72%. Accordingly, the tracked large-cap technology stocks did not all close in the same direction. Amazon closing data Amazon stock hub Tesla closing data Tesla stock hub

Higher volatility and lower yields: distinguishing reported background from interpretation

The VIX closed at 15.87 points on August 18, 2026, up 0.68 points, or 4.48%. In contrast, the U.S. 10-year yield fell 0.018 percentage points to 4.706% on the same trading day. WTI crude oil closed at $84.22 per barrel, down $0.28, or 0.33%. VIX closing data U.S. 10-year yield data WTI crude oil closing data

The closing data show that declining stock indexes, a higher VIX, a lower U.S. 10-year yield, and lower WTI crude oil occurred together on August 18, 2026. This should not be interpreted as a causal relationship.

The original Schwab article cited weakness in semiconductor stocks as market context and noted that 10 of the S&P 500’s 11 sectors declined, with only the energy sector rising. The original Investopedia article also addressed the retreat in major indexes and technology-stock moves in its headline. These are the market interpretations presented by the articles, and the regular-session closing moves in individual stocks and indexes cannot be conclusively attributed to that single explanation.

Three items to check in the next regular session

  1. It is necessary to check how the Nasdaq Composite and Russell 2000, which fell 1.33% and 1.30%, respectively, on August 18, 2026, perform relative to the Dow Jones, which declined only 0.22%, at the next regular-session close.

  2. It is possible to examine whether SanDisk, Micron, and Nvidia, which fell 9.01%, 7.02%, and 2.34%, respectively, on August 18, 2026, continue their performance gap versus Apple, which rose 1.45%, and Microsoft and Alphabet, which posted near-flat gains.

  3. It is necessary to check what combination of moves the VIX, which rose 4.48% to 15.87 points on August 18, 2026, and the U.S. 10-year yield, which fell 0.018 percentage points to 4.706%, show at the next regular-session close. These are observation items only and do not indicate a direction for the next trading day or recommend buying or selling.