Weekly Market Movers Review
Market-cap attribution and breadth review for the week ending 2026-08-14. Educational research only.
Savior’s Take
This week’s market structure should be read beneath the headline. The key question is whether leadership is broadening or staying concentrated.
Weekly Snapshot
|
Period
2026-08-07 to 2026-08-14
|
Names Used
485 / 503
|
Cap-Weighted Return
-0.03%
|
|
Equal-Weight Return
+1.11%
|
Top 50 Contribution
-0.369 percentage points
|
Bottom 450 Contribution
+0.342 percentage points
|
|
Next 50 Contribution
+0.162 percentage points
|
Next 100 Contribution
+0.058 percentage points
|
Middle 100 Contribution
+0.096 percentage points
|
|
Final 200 Contribution
+0.027 percentage points
|
Advancers / Decliners
285 / 198
|
Largest $ Gainer
SNDK / $62.6B
|
|
Largest $ Loser
AVGO / $-165.4B
|
Week’s Top Contributor
SNDK / +0.086 percentage points
|
Week’s Top Detractor
AVGO / -0.228 percentage points
|
Leadership Read
- Equal weight outperformed the cap-weighted read, meaning the average stock held up better than the headline index.
Day-by-Day Market Movers
This table shows the biggest daily market-cap contributor and detractor during the weekly window. It helps identify whether leadership was consistent or whether last week’s winner became this week’s pressure point.
| Date | Top Daily Contributor | Top Daily Detractor |
|---|---|---|
| 2026-07-13 | MSFT Microsoft $43.8B / +0.069 percentage points |
NVDA Nvidia $-180.0B / -0.283 percentage points |
| 2026-07-14 | NVDA Nvidia $200.3B / +0.315 percentage points |
IBM IBM $-68.8B / -0.108 percentage points |
| 2026-07-15 | AAPL Apple Inc. $185.6B / +0.292 percentage points |
MU Micron Technology $-89.0B / -0.140 percentage points |
| 2026-07-16 | AAPL Apple Inc. $84.6B / +0.133 percentage points |
GOOGL Alphabet Inc. (Class A) $-200.9B / -0.316 percentage points |
| 2026-07-17 | CSCO Cisco $9.0B / +0.014 percentage points |
NVDA Nvidia $-111.2B / -0.175 percentage points |
Weekly Contribution by Market-Cap Bucket
| Bucket | Names | Contribution | Read |
|---|---|---|---|
| Top 50 1-50 |
50 | -0.369 percentage points | Largest companies / headline index leadership |
| Next 50 51-100 |
50 | +0.162 percentage points | Large but less dominant companies |
| Next 100 101-200 |
100 | +0.058 percentage points | Middle of the index |
| Middle 100 201-300 |
100 | +0.096 percentage points | Broader market participation |
| Final 200 301-end |
185 | +0.027 percentage points | Smallest S&P 500 constituents |
Breadth Read
The top 50 contributed -0.369 percentage points. The bottom 450 contributed +0.342 percentage points. A headline return is most convincing when the average stock and broader market-cap buckets confirm the move.
Top Positive Weekly Contributors
| Name | Return | Mkt Cap Change | Contribution |
|---|---|---|---|
| SNDK Sandisk |
+35.38% | $62.6B | +0.086 percentage points |
| TSLA Tesla, Inc. |
+4.17% | $54.1B | +0.074 percentage points |
| AMD Advanced Micro Devices |
+6.42% | $50.7B | +0.070 percentage points |
| STX Seagate Technology |
+19.77% | $36.4B | +0.050 percentage points |
| NVDA Nvidia |
+0.54% | $29.1B | +0.040 percentage points |
| XOM ExxonMobil |
+4.61% | $29.0B | +0.040 percentage points |
| WMT Walmart |
+3.06% | $27.2B | +0.037 percentage points |
| CVX Chevron Corporation |
+7.20% | $26.4B | +0.036 percentage points |
Top Negative Weekly Contributors
| Name | Return | Mkt Cap Change | Contribution |
|---|---|---|---|
| AVGO Broadcom |
-8.13% | $-165.4B | -0.228 percentage points |
| AMZN Amazon |
-4.31% | $-127.6B | -0.176 percentage points |
| GOOG Alphabet Inc. (Class C) |
-2.81% | $-121.4B | -0.167 percentage points |
| AAPL Apple Inc. |
-2.28% | $-104.1B | -0.143 percentage points |
| GOOGL Alphabet Inc. (Class A) |
-2.37% | $-102.7B | -0.141 percentage points |
| MNST Monster Beverage |
-48.19% | $-85.3B | -0.117 percentage points |
| CSCO Cisco |
-8.03% | $-38.4B | -0.053 percentage points |
| BRK-B Berkshire Hathaway |
-3.41% | $-38.0B | -0.052 percentage points |
The Bottom Line
This weekly report is designed to show whether headline index performance was driven by concentrated leadership or confirmed by broader participation. That distinction matters because the next Compass report, weekly email, and market structure dashboard rely on the same leadership and breadth read.