Observatory · observe first

Where is market allocation moving?

See what is gaining weight, how quickly it is changing, and what is driving the move.

Historical time machine
Historical observation
20182026
S&P 500 matched members · 122 industries · May 2024Market-cap weights, not measured fund flows · pp = percentage points
Gaining weight
39
industries · over the last 12 months
Losing weight
71
industries · over the last 12 months
Accelerating
1
positive 3M gains are speeding up
Slowing
0
3M movement is easing, in either direction

Gaining market weight

Largest sector gains · last 12 months

Losing market weight

Largest sector declines · last 12 months

The pace is changing

Latest 3 months versus the previous 3 months

What is driving the change?

12-month company attribution · a rising industry does not mean every company is gaining

Follow the hierarchy →
Concentrated

Most of this industry's gains came from a few companies.

Packaging Corporation of America+3.941 pp
All other companies-0.027 pp
25% of companies above their 6M weight average
See what contributed →
Concentrated

Most of this industry's losses came from a few companies.

Apple Inc.-1.252 pp
All other companies-0.007 pp
14% of companies above their 6M weight average
See what contributed →
Concentrated

Most of this industry's gains came from a few companies.

GE Vernova+0.092 pp
All other companies+0.000 pp
50% of companies above their 6M weight average
See what contributed →

Industry movements at a glance

Largest absolute allocation changes · descriptive observations, not rankings of investment merit

Watch the historical rotation →
IndustryMarket weight12M changeMovementParticipationWeight history · 24M
Paper & Plastic Packaging Products & Materials
Gained weight for 1 consecutive month
31.70%+3.91 ppReversing upwardConcentrated
Technology Hardware, Storage & Peripherals
Lost weight for 1 consecutive month
5.83%-1.26 ppDeclining fasterConcentrated
Consumer Staples Merchandise Retail
Lost weight for 1 consecutive month
1.94%+0.73 ppGaining steadilyConcentrated
Automobile Manufacturers
Lost weight for 1 consecutive month
1.27%-0.55 ppDeclining fasterConcentrated
Broadline Retail
Lost weight for 1 consecutive month
3.56%+0.45 ppReversing downwardConcentrated
Semiconductors
Lost weight for 2 consecutive months
3.11%+0.43 ppReversing downwardConcentrated
Pharmaceuticals
Lost weight for 1 consecutive month
3.41%-0.36 ppReversing downwardConcentrated
Managed Health Care
Lost weight for 1 consecutive month
1.27%-0.36 ppDeclining fasterConcentrated
Health Care Equipment
Lost weight for 4 consecutive months
1.95%-0.35 ppReversing downwardBroad
Soft Drinks & Non-alcoholic Beverages
Lost weight for 1 consecutive month
1.11%-0.33 ppDeclining fasterConcentrated
How are these descriptive states defined?

Gaining / losing: 12-month weight change above +0.005pp / below −0.005pp. Direction and speed are separate dimensions, not mutually exclusive recommendations.

Accelerating / slowing: compare the most recent 3M change with the preceding 3M change. Accelerating means a positive change speeds up by >0.02pp. Slowing means the magnitude of movement declines by >0.02pp. A falling industry can also slow.

Reversing: the last two 3M changes have opposite signs, outside a ±0.005pp tolerance. Persistence counts consecutive same-direction monthly changes.

Broad / concentrated: company attribution, not a market-cap concentration shortcut. Concentrated means the three largest same-direction contributors account for ≥70% of gross same-direction changes; otherwise broad requires ≥60% of constituents moving with the industry. Other cases are mixed.

Weights use matched S&P 500 members with SEC-reported shares and monthly prices. Companies without both data series are omitted; weights are normalised across matched members each month. These are simple market-cap estimates, not official float-adjusted S&P weights or measured investor flows.