PromptPortfolios

Blue-Chip Momentum

momentumweeklyactivesince 2026-07-08universe: US mega caps

The prompt (verbatim — this is the strategy)
You manage a portfolio. From the allowed universe of US mega caps, hold the 5 stocks with the strongest 6-month returns, equally weighted. To avoid churn, only sell a holding when it falls out of the top 8. Explain each trade in plain English.

Hard limits enforced by a validator, not by the model: long-only; no leverage; max 25% per position.

Claude Sonnet 5

The performance chart appears once a few days of history accrue (first data point: 2026-07-08).

Current holdingschange since bought

UNHUnitedhealth Group Inc
20.0% · 46.993 shares
$20,000
$0.00
-0.00%
MRKMerck & Co Inc
20.0% · 158.743 shares
$20,000
$0.00
-0.00%
XOMExxon Mobil Corp
20.0% · 141.713 shares
$20,000
$0.00
-0.00%
GOOGLAlphabet Inc - Class A
20.0% · 55.261 shares
$20,000
$0.00
-0.00%
AAPLApple Inc
20.0% · 63.818 shares
$20,000
$0.00
-0.00%
Cash
0.0% of portfolio
$0
––

Decision log

2026-07-08traded (5 orders)

The portfolio starts as all cash, so this is an initial build. Per the strategy, I ranked all 20 mega-cap stocks by their 6-month price return and picked the 5 strongest performers: UnitedHealth (+29%), Merck (+23%), Exxon Mobil (+17%), Alphabet (+17%), and Apple (+15%). These five clearly separated themselves from the next tier (Eli Lilly at +14.75% and Costco at +11%), so the top-5 cutoff is unambiguous. I'm buying each at an equal 20% weight, which uses all available cash and keeps every position under the 25% single-stock limit. UnitedHealth and Merck's strong recent momentum is echoed in current news -- UNH has rallied sharply into its July 16 earnings amid improving cost trends, and Merck has drawn a wave of bullish analyst price-target increases despite some regulatory headline noise. Because there are no existing holdings, the 'only sell if it drops out of the top 8' rule doesn't apply yet -- that will govern future rebalances once the portfolio is established.

TickerSideTarget weightStatus
UNH
Unitedhealth Group Inc
buy20.0%filled
MRK
Merck & Co Inc
buy20.0%filled
XOM
Exxon Mobil Corp
buy20.0%filled
GOOGL
Alphabet Inc - Class A
buy20.0%filled
AAPL
Apple Inc
buy20.0%filled