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 · Oct 2019Market-cap weights, not measured fund flows · pp = percentage points
Gaining weight
112
industries · over the last 12 months
Losing weight
2
industries · over the last 12 months
Accelerating
9
positive 3M gains are speeding up
Slowing
12
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.

Microsoft+2.922 pp
All other companies+0.040 pp
100% of companies above their 6M weight average
See what contributed →
Concentrated

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

Garmin-44.325 pp
All other companies+0.000 pp
100% of companies above their 6M weight average
See what contributed →
Broad

The gain is shared across much of the industry.

Fidelity National Information Services+0.306 pp
All other companies+1.056 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
Consumer Electronics
Gained weight for 3 consecutive months
0.10%-44.32 ppReversing upwardConcentrated
Systems Software
Gained weight for 1 consecutive month
5.79%+2.96 ppReversing upwardConcentrated
Diversified Banks
Gained weight for 2 consecutive months
6.60%+2.43 ppReversing upwardConcentrated
Aerospace & Defense
Lost weight for 1 consecutive month
5.29%+2.16 ppSlowingBroad
Pharmaceuticals
Gained weight for 1 consecutive month
5.34%+1.80 ppReversing upwardBroad
Health Care Equipment
Lost weight for 2 consecutive months
3.37%+1.57 ppReversing downwardBroad
Semiconductors
Gained weight for 2 consecutive months
3.26%+1.48 ppReversing upwardBroad
Transaction & Payment Processing Services
Gained weight for 1 consecutive month
2.34%+1.36 ppAcceleratingBroad
Application Software
Lost weight for 2 consecutive months
3.07%+1.32 ppSlowingConcentrated
Movies & Entertainment
Lost weight for 3 consecutive months
1.29%+1.24 ppReversing downwardConcentrated
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.