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 · Mar 2023Market-cap weights, not measured fund flows · pp = percentage points
Gaining weight
39
industries · over the last 12 months
Losing weight
70
industries · over the last 12 months
Accelerating
3
positive 3M gains are speeding up
Slowing
17
3M movement is easing, in either direction

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.

Amazon+3.332 pp
All other companies-0.032 pp
50% of companies above their 6M weight average
See what contributed →
Broad

The loss is shared across much of the industry.

Bank of America-0.339 pp
All other companies-0.492 pp
0% of companies above their 6M weight average
See what contributed →
Concentrated

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

Tesla, Inc.+0.990 pp
All other companies-0.091 pp
33% 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
Broadline Retail
Gained weight for 1 consecutive month
3.69%+3.30 ppReversing upwardConcentrated
Automobile Manufacturers
Lost weight for 1 consecutive month
2.57%+0.90 ppAcceleratingConcentrated
Diversified Banks
Lost weight for 1 consecutive month
3.40%-0.83 ppReversing downwardBroad
Technology Hardware, Storage & Peripherals
Gained weight for 3 consecutive months
9.19%-0.77 ppReversing upwardConcentrated
Systems Software
Gained weight for 2 consecutive months
7.60%-0.34 ppReversing upwardConcentrated
Rail Transportation
Lost weight for 1 consecutive month
0.80%-0.30 ppDeclining fasterConcentrated
Transaction & Payment Processing Services
Lost weight for 2 consecutive months
1.34%-0.28 ppSlowingConcentrated
Soft Drinks & Non-alcoholic Beverages
Gained weight for 2 consecutive months
1.99%+0.27 ppReversing downwardConcentrated
Movies & Entertainment
Lost weight for 2 consecutive months
0.73%-0.25 ppReversing upwardConcentrated
Cable & Satellite
Lost weight for 2 consecutive months
0.58%-0.22 ppSlowingConcentrated
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.