Table of Contents
Key Takeaways
- The Dow has no fixed selection criteria. A 5-person committee at S&P Dow Jones Indices picks the 30 companies — and they explicitly say it’s judgment, not a formula.
- The Dow is price-weighted, not market-cap-weighted. A $400 stock has more influence on the index than a $100 stock — even if the $100 stock is a much larger company.
- Real recent changes: Amazon added Feb 2024 (replaced Walgreens). Salesforce added 2020 (replaced ExxonMobil). Apple added 2015 (replaced AT&T). Each move shifted the index’s character more than most investors notice.
The Dow Is Picked by a Committee, Not a Formula
The S&P 500 has clear rules: $20.5+ billion market cap, US-domiciled, profitable in the most recent quarter and over the trailing year, sufficient liquidity, etc. Run those rules and you can predict (mostly) which companies qualify.
The Dow doesn’t work that way. There’s a 5-person Index Committee — staff from S&P Dow Jones Indices plus one representative from The Wall Street Journal — that picks the 30 names. The official methodology document is unusually candid about it: companies should have an “excellent reputation,” show “sustained growth,” and be “of interest to a large number of investors.” Those aren’t rules. They’re vibes.
Source: S&P Dow Jones Indices — Dow Methodology.
That’s worth absorbing because it changes how you should think about Dow inclusion. There’s no “Apple finally hit the threshold” moment. Someone on a committee decided Apple should be in, and someone decided AT&T should be out, on the same day in March 2015.
Trump’s Tariffs May Spark an AI Gold Rush
While headlines focus on trade wars, our AI has identified one specific $1.5 trillion opportunity that remains completely overlooked. Take the 30-second assessment now to see if your trading profile matches this high-growth play before the opportunity expires.
SEE MY AI ASSESSMENT ➔The Price-Weighted Quirk That Shapes Everything
The Dow is one of the only major indexes still using price weighting. The S&P 500, Nasdaq Composite, FTSE 100, MSCI World — all market-cap weighted. The Dow is the holdout.
What that means in practice: a stock priced at $500 contributes ten times more to Dow movement than a stock priced at $50, regardless of which company is bigger. UnitedHealth (~$550 in early 2025) moves the Dow far more than Verizon (~$40), even though Verizon’s market cap is comparable.
This is why stock splits matter for the Dow in a way they don’t for the S&P 500. When Apple did its 4-for-1 split in August 2020, Apple’s price dropped from ~$500 to ~$125 — and Apple’s weight in the Dow dropped along with it, even though nothing about Apple’s actual size changed. Apple went from a top-three Dow influencer to a middle-of-the-pack one overnight.
The committee uses something called the Dow Divisor to keep the index level continuous when companies are swapped or splits happen. As of 2025 the divisor is around 0.15 (it was 16.67 in 1928 — adjustments compound over decades). Multiplying the sum of 30 stock prices by 1/divisor gives you the index level.
How Companies Actually Get Added or Removed
The committee meets as needed — there’s no fixed schedule like the Russell rebalance. Changes typically happen for one of three reasons:
- Sector rebalancing. The committee wants the Dow to reflect the broader US economy. When a sector becomes underweight (or overweight), names get swapped.
- A company no longer fits. Bankruptcy, acquisition, prolonged underperformance, or a stock price so low it has near-zero index influence (a sub-$10 stock barely moves the Dow).
- A peer company has obviously eclipsed an existing member. When the committee added Apple in 2015, it had been the largest US company by market cap for years. The exclusion was getting embarrassing.
Stock splits often trigger reshuffles. Apple’s 2020 split is the textbook case — it pulled Apple’s Dow weight down sharply, and the committee added Salesforce (replacing ExxonMobil) the same week, partly to maintain technology-sector representation now that Apple’s contribution had shrunk.
Five Real Recent Changes Worth Knowing
February 2024 — Amazon in, Walgreens Boots Alliance out
Amazon’s addition was overdue by most accounts. Walgreens had been struggling for years (stock down ~70% from its peak); Amazon represented retail and cloud computing in a way Walgreens couldn’t. The change increased the Dow’s tech and consumer-discretionary tilt.
August 2020 — Salesforce in (replacing ExxonMobil), Amgen in (Pfizer out), Honeywell in (Raytheon out)
Three changes in one move — the largest reshuffle in years. ExxonMobil had been in the Dow since 1928 (originally as Standard Oil of New Jersey). Removing it signaled the committee’s view that the energy sector’s role in the broader economy had diminished. The shuffle was triggered by Apple’s 4-for-1 split, which had reduced tech-sector weight.
March 2015 — Apple in, AT&T out
The committee waited until Apple’s 7-for-1 split in mid-2014 brought the price down to a more “Dow-friendly” range (~$125, vs. the $700+ it would have been pre-split). At a $700 share price, Apple alone would have moved the Dow as much as several other components combined.
September 2013 — Goldman Sachs, Visa, Nike in; Bank of America, Hewlett-Packard, Alcoa out
Triple swap to refresh sector representation post-financial-crisis. Bank of America’s price had collapsed during the crisis (sub-$15), making its Dow contribution negligible. Alcoa’s removal effectively ended the Dow’s traditional materials-sector representation.
September 2008 — Kraft in, AIG out
AIG’s collapse during the financial crisis forced an emergency removal — its near-zero stock price made it useless for index purposes. This is a rare example of forced removal rather than committee preference.
What These Changes Actually Mean for Investors
Three concrete effects:
1. The Dow’s character shifts more than people realize
The Dow of 2025 is heavily tech-tilted (Apple, Microsoft, Salesforce, Amazon, Cisco, IBM, Intel) in a way it wasn’t a decade ago. The energy-and-industrial flavor of the 1990s and early 2000s is largely gone. Comparing “the Dow” across decades is like comparing two different indexes — the names underneath have changed substantially.
2. Index-tracking funds rebalance immediately
The DIA ETF (SPDR Dow Jones Industrial Average) holds the 30 components. When a swap happens, DIA sells the outgoing name and buys the incoming one. This creates short-term price effects: incoming names often see a small “inclusion bump” from forced ETF buying, outgoing names face the opposite.
3. The Dow remains a poor portfolio benchmark
Despite its visibility on TV news, the Dow is too narrow (30 names) and too price-weighted to be a useful benchmark for most portfolios. The S&P 500 is what professionals actually compare against. Capital gains rules apply identically to Dow vs S&P 500 ETFs — the choice is about index quality, not tax treatment.
Why the Dow Survives Despite Its Flaws
By every academic measure, price-weighted indexes are inferior to cap-weighted ones. The Dow’s 30-name selection is too narrow for serious diversification analysis. Most institutional money tracks the S&P 500 or broader Russell indexes.
So why does “the Dow” still lead financial news?
Three reasons:
- Brand inertia. The Dow has existed since 1896. The S&P 500 only since 1957. The headline has stuck.
- Simplicity. “Dow up 200” is one round number a non-investor can grasp. “S&P up 0.7%” requires more context.
- Accuracy on direction. The Dow and S&P 500 correlate above 0.95 daily. The Dow is wrong about the magnitude but right about the direction most days, which is good enough for headlines.
For investing decisions, watch the S&P 500. For knowing whether stocks went up today, the Dow is fine.
Common Questions
Who decides which companies are in the Dow?
A 5-person committee from S&P Dow Jones Indices, including one editor from The Wall Street Journal. They meet as needed and there’s no fixed schedule. Their criteria are explicitly judgment-based, not formulaic.
Why isn’t Tesla, Berkshire Hathaway, or Google in the Dow?
Tesla’s stock price is volatile and historically very high — including it would create distortion in a price-weighted index. Berkshire Hathaway’s Class A shares trade above $700,000 (yes, that’s the actual price) — completely incompatible with the Dow structure. Google (Alphabet) trades at hundreds of dollars and the committee simply hasn’t added it; competing tech names already cover the sector.
How often does the Dow change its components?
There’s no fixed rebalance. Recent history: changes in 2024 (Amazon/Walgreens), 2020 (three-way swap), 2019 (Dow Inc replaced DowDuPont after spinoff), 2018 (Walgreens replaced GE — yes, GE was an original 1896 component). Roughly one major change per year, plus occasional spinoff-driven swaps.
What happens to a stock when it’s added or removed from the Dow?
Index funds tracking the Dow (DIA being the largest, ~$30B AUM) immediately rebalance. Incoming names see modest buying pressure for a few days; outgoing names see the opposite. The price effect is usually 1-3% in either direction, often reversed within weeks once the rebalance flow completes.
Is the Dow a good index to invest in?
It’s fine but not ideal. The S&P 500 (via VOO, IVV, or SPY) gives broader diversification and uses cap-weighting that better reflects company size. The Dow’s 30 names skew toward established large-caps — exposure overlap with the S&P 500 is high but the price-weighting introduces structural quirks. Most investors should own the S&P 500 over the Dow if forced to choose.
The Bottom Line
The Dow is a historical artifact maintained by a small committee that values continuity and brand strength over methodological rigor. Companies get added when the committee thinks the index needs them; they get removed when they no longer fit the committee’s read of the US economy. Macro policy shifts reshape sectors over time, and the Dow’s composition follows — slowly, judgmentally, and visibly. Knowing the Dow’s mechanics doesn’t change your portfolio. It does help you read the financial news with the right amount of skepticism.
