Stock Split: More Shares, Same Company, Checked on 14 Real Splits
A stock split turns each existing share into several new ones and divides the share price by the same number, so a holding is worth the same the moment it happens. When Nvidia split ten-for-one in June 2024, a share that closed at $1,208.88 on 7 Jun became ten shares worth $120.89 each.
A stock split is one of the few corporate events where the arithmetic settles the question before the market opens. The company does not raise money, does not change its business and does not hand out value. It changes the number of pieces its ownership is cut into. This page walks through one split from the company’s own filing, then checks what happened to the price in fourteen of them.
How it works
The company issues extra shares to every holder, in proportion to what they already own. In a ten-for-one split, each share becomes ten. In a four-for-one, each becomes four: Apple’s 2020 filing described it as three additional shares for every share held.
The price is divided by the same number. If there are ten times as many shares and the company is worth the same, each share is worth a tenth as much. The exchange adjusts the reference price overnight, and trading resumes on the new basis.
Nothing of value moves. The SEC’s investor site makes the point directly: a split raises the share count without changing shareholders’ equity, and it does not dilute existing owners. Everyone’s fraction of the company is exactly what it was.
Per-share numbers are divided too. Earnings per share, dividends per share and book value per share all shrink by the split ratio, and the company restates past years on the new basis so they stay comparable.
Two legal routes, one result. Some companies amend their charter to split the shares; others pay a stock dividend of the extra shares. Tesla, Alphabet and Chipotle’s filings describe the dividend route, as did Nvidia’s in 2021; Nvidia’s 2024 filing, Amazon’s and Walmart’s describe a charter amendment. For a shareholder the outcome is the same.
A reverse split runs the arithmetic the other way, combining several shares into one and multiplying the price.
The four dates in a split
Every split has a timetable, and the company’s 8-K sets it out. Nvidia’s, filed on 22 May 2024, is a clean example:
- Announcement, Wednesday 22 May 2024: the company announced a ten-for-one forward split.
- Record date, Thursday 6 Jun 2024: holders of record at the close of market that day qualified.
- Distribution, after the close on Friday 7 Jun 2024: each holder received nine more shares for every one held.
- First split-adjusted session, Monday 10 Jun 2024: trading opened on the new basis.
Buying between the record date and the distribution still gets the new shares. The SEC’s investor site explains why: for a stock dividend, the ex-date is set the first business day after the new shares are paid, so the entitlement travels with the share until then. The date that matters to a trader is the last one: every price after it is on the new basis.
Apple’s four-for-one ran the same way, according to its release of 30 Jul 2020: record date 24 Aug 2020, split-adjusted trading from 31 Aug 2020.
A worked example
Nvidia closed at $1,208.88 on Friday 7 Jun 2024, the last session before the split.
Take a holder of 10 shares. Before the split: 10 x $1,208.88 = $12,088.80.
After the split: 10 x 10 = 100 shares. The equivalent price per new share is $1,208.88 / 10 = $120.888, which rounds to $120.89. The holding: 100 x $120.888 = $12,088.80, the same amount.
On Monday 10 Jun 2024 Nvidia opened at $120.37 and closed at $121.79. The open was 0.43% below the divided price, the kind of overnight move any stock makes; the split itself added or removed nothing.
The dividend was divided too. In the same 8-K, Nvidia said its next quarterly dividend would be equivalent to $0.01 per share on a post-split basis.
And so were past earnings. Nvidia’s fiscal 2024 diluted EPS was $11.93 in the 10-K filed on 21 Feb 2024. The 10-K filed on 26 Feb 2025 shows the same year as $1.19. The earnings per share page follows that restatement across four years.
Why companies split
The SEC’s investor site says companies often split to make shares more affordable to investors, and the companies’ own filings give much the same reason. Nvidia, Tesla and Broadcom said a split would make owning the stock more accessible to employees and investors; Apple and Interactive Brokers spoke of investors. Walmart tied its 2024 split to the stock purchase benefits of its own staff.
Before fractional shares were common, a high price kept small buyers out. A single Chipotle share closed at $3,283.04 on 25 Jun 2024, the day before its fifty-for-one split. Many brokers now sell fractional shares, which removes most of that barrier. Listed option contracts still cover 100 shares each, so a high share price still makes each contract expensive.
A split is not a signal the company has disclosed anything new. It often follows a long rise in the price, and some are announced in the same release as quarterly results, as Apple’s, Alphabet’s, Broadcom’s and Nvidia’s 2024 split were, which is why a split is easily confused with the news around it.
The original data
The data: 14 forward splits by large US companies from 2020 to 2025, a chosen set rather than every split, each checked against the company’s own 8-K or 10-Q on 25 Sep 2026. Prices are Yahoo Finance daily bars. Yahoo adjusts old prices for splits, so each close before a split is multiplied back by that split and any later ones to recover the price that actually traded. All 14, with filing links, are in a CSV of stock splits since 2020.
For each, the last close is divided by the split ratio and set against the first split-adjusted open. Six of them:
- Apple, 4-for-1, 31 Aug 2020: $499.23 / 4 = $124.81; opened at $127.58.
- Tesla, 5-for-1, 31 Aug 2020: $2,213.40 / 5 = $442.68; opened at $444.61.
- Amazon, 20-for-1, 6 Jun 2022: $2,447.00 / 20 = $122.35; opened at $125.25.
- Alphabet Class A, 20-for-1, 18 Jul 2022: $2,235.55 / 20 = $111.78; opened at $112.64.
- Nvidia, 10-for-1, 10 Jun 2024: $1,208.88 / 10 = $120.89; opened at $120.37.
- Chipotle, 50-for-1, 26 Jun 2024: $3,283.04 / 50 = $65.66; opened at $65.81.
Across all 14, the gap between the divided close and the first open ranged from 0.04% to 2.37%. Nine of the 14 were within 0.5%. The largest were Amazon at 2.37%, Apple at 2.22% and Tesla’s 2022 split at 1.77%. The split sets the starting price; the gap after it is the market’s own overnight move, and for Amazon and Walmart it was larger than on most mornings in the year before.
The share count moves the other way. Nvidia’s cover pages show 620 million shares as of 19 Feb 2021, 623 million as of 21 May 2021 and 2.5 billion as of 13 Aug 2021, after its four-for-one. They show 2.5 billion again as of 16 Feb 2024, 2.46 billion as of 24 May 2024 and 24.53 billion as of 23 Aug 2024, after its ten-for-one. The counts are in a CSV of Nvidia’s share count around its splits.
Put together, the two splits turned each early-2021 share into 40. The 620 million shares on the February 2021 cover page equal 24.8 billion shares on today’s basis.
When it fails
Unadjusted charts. A price series that has not been adjusted shows Nvidia falling from $1,208.88 to about $120 in a weekend. Any indicator, backtest or scan run on that series reads a 90% crash. Many charting platforms adjust automatically, but downloaded data, some broker histories and hand-marked levels do not.
Old per-share figures in the wrong place. Research notes, screens and spreadsheets written before a split carry the old EPS and dividend per share. Setting a pre-split EPS against a post-split price produces a P/E ten times too low for a ten-for-one split.
Reading the split as a buy signal. The company is worth the same after the split as before it. Any rise that follows is a separate market move; in the 14 openings above, the divided price was the starting point and the market moved from there.
Confusing it with a reverse split. The mechanics match, but the context rarely does: forward splits tend to follow a long rise, while reverse splits usually follow a long fall, often to keep an exchange listing.
Options holders. Listed option contracts are adjusted so the position keeps the same value, usually by changing the number of contracts and the strike price. A trader who checks only the strike on the morning of the split sees a position that looks nothing like the one bought.
Taxes and cost basis. A split is generally not a sale, but the cost of each share is divided by the ratio. A broker that records it wrongly will misreport the gain later, so check the cost basis after the split.
Related
The reverse split page covers the same arithmetic run backwards, and why it usually signals trouble. Common stock explains the share being split, and fractional shares covers the other way brokers now let small accounts buy expensive stocks. For what a split does to the numbers behind a valuation, the earnings per share and market cap pages follow it through.
When a stock I follow splits, I redraw any levels I marked by hand and check that my chart feed has adjusted the history. An unadjusted chart of a ten-for-one split shows a 90% drop that never happened.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.