By Due Bills and Stock Splits: Ex-Date Timing
Why a stock split's ex-date lands after the payable date, what a due bill is, who tracks it, and the full timeline from record date to first adjusted session.
A due bill is a claim attached to a stock trade: it says the buyer, not the seller, is entitled to the extra shares a company is about to distribute in a stock split. It exists to cover one gap in the calendar. For most stock splits the ex-date, the first session where shares change hands at the new adjusted price, falls the business day after the payable date, which is the reverse of the dividend calendar most investors know. Between the record date and that ex-date, shares keep trading at the old unadjusted price, and the due bill is what keeps both sides of every trade whole.
What is a due bill in a stock split?
A due bill is an entitlement that travels with a trade rather than with a person. When a company distributes shares, the record date fixes the list of holders the transfer agent will credit. A stock trade settles one business day after it prints under T+1 settlement, so a purchase made on the record date itself settles one day too late to reach that list. The additional shares land in the seller's account on the payable date, and the buyer, who paid an unadjusted price for them, holds the claim. That claim is the due bill.
Two features matter to a retail investor. It attaches to the trade rather than to an account holder, and it is tracked between the two clearing brokers standing behind that trade. Nothing appears on your statement asking you to act on it.
Why a split's ex-date comes after the payable date
Market rules sort distributions by size. Anything worth less than 25% of the value of the shares uses the calendar you already know from record date vs ex-dividend date: the ex-date lands first, the record date follows, and a buyer on or after the ex-date does not receive the distribution. A distribution of 25% or more, which covers every forward split from 5-for-4 upward, flips that order. Its ex-date is set for the first business day following the payable date.
The mechanics behind the flip are physical. Until the payable date the new shares do not exist in anyone's account. A market that cut the quoted price to the post-split level before then would be asking sellers to deliver shares they had not yet received. Holding the ex-date until after payment keeps the quoted price and the deliverable share count in step. The due bill covers the trades caught in the middle.
The full timeline, with a name for every date
Call the record date R and the ex-date X. A forward split large enough to clear the 25% line runs through the same five points.
- Announcement. The board declares the split and sets the record and payable dates. The exchange assigns the ex-date afterward.
- Record date R. Holders on the company's books at the close of business on R are the ones the transfer agent credits.
- Payable date, often the next business day after R. The additional shares are distributed to those record holders. The quoted price has not moved yet.
- Ex-date X, the first business day after the payable date. The quoted price is divided by the ratio, the share count multiplies, and trades from this session on carry no due bill.
- Redemption. A short, fixed number of business days after X, the clearing brokers settle the outstanding due bills, and the extra shares reach the buyers who bought inside the window.
The due bill period is the stretch from R through the session before X. A purchase on R settles the next business day, one day past the record list, and every purchase up to the session before X is struck at the unadjusted price. Each of those trades carries the entitlement forward to its buyer.
What a split looks like on the tape
NVIDIA's June 2024 split is a clean illustration, and the query below pins it: five sessions on each side, with the dates fixed in the SQL, so the picture never moves.
The exact SQL behind every number
SELECT
toString(a.date) AS session_date,
formatDateTime(a.date, '%b %e, %Y') AS tape_label,
if(a.date < '2024-06-10', 'before ex-date', 'on or after ex-date') AS tape_phase,
round(toFloat64(a.close), 2) AS close_price,
round(toFloat64(a.close) * s.ratio, 2) AS one_prior_share_value
FROM
(
SELECT
date,
max(close) AS close
FROM global_markets.stocks_daily_aggs
WHERE ticker = 'NVDA'
AND date >= '2024-06-03'
AND date <= '2024-06-14'
GROUP BY date
) AS a
CROSS JOIN
(
SELECT toFloat64(max(split_to)) / greatest(toFloat64(max(split_from)), 1.0) AS ratio
FROM global_markets.stocks_splits
WHERE ticker = 'NVDA'
AND execution_date BETWEEN '2024-06-05' AND '2024-06-12'
) AS s
ORDER BY a.dateRead the panel one series at a time. close_price is the stored daily close, and stored price history is restated after a split: every close before the ex-date is divided by the ratio, keeping the file continuous for anyone charting it later. That series sits at $120.89 on Jun 7, 2024 and $121.79 on Jun 10, 2024, with no step between them. Neither figure is what anyone paid on the earlier session.
one_prior_share_value undoes the restatement. It multiplies every close in the window by the split ratio, which recovers the price that printed on the tape before the ex-date and tracks the value of one pre-split holding after it. On Jun 7, 2024, the last session before the ex-date, a share changed hands at $1208.88. On Jun 10, 2024 that same original share, now a larger number of shares, was worth $1217.9. The series carries only the ordinary session-to-session move and does not step at the split: price and share count move by the same ratio, so a holder's position value is untouched by the event itself. That is the whole content of what a stock split does to your shares. By the rule above, the payable date is the business day before that first ex-date session, which places it on the before-ex-date side of the panel, and the due bill period ends there.
How often does this happen?
Forward splits large enough to reverse the calendar are ordinary events. The panel counts every split on the US tape by the year it took effect, sorted into the ones that clear the 25% line, the small forward splits below it, and reverse splits.
The exact SQL behind every number
SELECT
toString(toYear(execution_date)) AS year,
countIf(ratio >= 1.25) AS large_distributions,
countIf(ratio > 1 AND ratio < 1.25) AS small_forward_splits,
countIf(ratio < 1) AS reverse_splits
FROM
(
SELECT
ticker,
execution_date,
max(toFloat64(split_to) / greatest(toFloat64(split_from), 1.0)) AS ratio
FROM global_markets.stocks_splits
WHERE execution_date >= '2016-01-01'
AND execution_date < toStartOfYear(today())
AND ticker NOT IN ('SPCX')
GROUP BY ticker, execution_date
)
GROUP BY year
ORDER BY yearIn 2025, 239 splits were large enough for the ex-date to follow the payable date. The same year carried 1036 reverse splits, which run on different machinery: a reverse split is processed as an exchange of old shares for new ones, with the adjusted price quoted from the effective date and no due bill period at all. For forward splits, when a stock split takes effect covers the effective date itself. This page covers why that date sits after the payment.
Household names make the size of these distributions concrete. Each bar is the number of shares one share turned into at that company's most recent split since 2020.
The exact SQL behind every number
SELECT
ticker,
round(argMax(toFloat64(split_to) / greatest(toFloat64(split_from), 1.0), execution_date), 2) AS shares_from_one,
argMax(concat(toString(toUInt32(split_to)), '-for-', toString(toUInt32(split_from))), execution_date) AS ratio_label,
argMax(formatDateTime(execution_date, '%b %e, %Y'), execution_date) AS adjusted_trading_began
FROM global_markets.stocks_splits
WHERE execution_date >= '2020-01-01'
AND execution_date <= today()
AND toFloat64(split_to) / greatest(toFloat64(split_from), 1.0) >= 2
AND ticker IN ('AAPL', 'AMZN', 'AVGO', 'CMG', 'DXCM', 'FTNT', 'GOOGL', 'LRCX', 'NEE', 'NVDA', 'PANW', 'SHOP', 'SMCI', 'TSLA', 'WMT')
GROUP BY ticker
ORDER BY shares_from_one DESC, tickerCMG sits at the top, turning one share into 50, with adjusted trading beginning Jun 26, 2024. The smallest ratio in the group still multiplies the share count by 2, well past the 25% line. Listed options are adjusted on the same date under their own rulebook, which how stock splits affect options walks through, and upcoming stock splits tracks the announced calendar ahead.
Is there anything for you to do?
No. The due bill is a broker-to-broker obligation, and your broker already knows when your trade settled. Two situations are worth recognizing when they show up on a statement.
If you buy inside the due bill period, you pay the unadjusted price and receive the additional shares through the due bill rather than from the company. They can arrive a few days after the ex-date rather than on the payable date, and a short mismatch between your share count and the quoted price is normal in that window.
If you sell inside the due bill period, the entitlement goes with the shares. Additional shares may still be credited to your account on the payable date, since you were the holder of record on that list. They are not yours to keep, and your broker moves them to the buyer at redemption.
Large special dividends work the same way
The 25% test is written about distributions in general. A one-time cash payment worth a quarter or more of the share price is handled like a split: the ex-date is set the business day after the cash is paid, and due bills carry the entitlement across the gap. That is why a handful of distributions every year appear to go ex after they were already paid.
The exact SQL behind every number
SELECT
ticker,
max(dateDiff('day', pay_date, ex_dividend_date)) AS days_ex_after_pay,
argMax(formatDateTime(ex_dividend_date, '%b %e, %Y'), dateDiff('day', pay_date, ex_dividend_date)) AS ex_label
FROM global_markets.stocks_dividends
WHERE ex_dividend_date > pay_date
AND pay_date >= '2010-01-01'
AND ex_dividend_date <= today()
AND dateDiff('day', pay_date, ex_dividend_date) <= 60
AND ticker NOT IN ('SPCX')
GROUP BY ticker
ORDER BY days_ex_after_pay DESC, ticker
LIMIT 12Every bar is a company whose cash distribution went ex after its own pay date, measured in calendar days between the two. ATIB carries the widest gap in the group at 55 days, with the ex-date landing Feb 3, 2015. An ordinary quarterly dividend never looks like this, and selling on the ex-dividend date covers that standard case.
FAQ
What is a due bill in a stock split?
A due bill is an obligation attached to a stock trade that moves the right to a pending distribution from the seller to the buyer. It applies to trades that settle after the record date but before the ex-date, while shares still change hands at the unadjusted price. Clearing brokers track and redeem it without any action from the investor.
Why is a stock split's ex-date after the payable date?
Distributions worth 25% or more of a share's value are assigned an ex-date on the first business day after the payable date. The new shares do not exist in any account before payment, so the market keeps quoting the unadjusted price until they arrive. Smaller distributions, including ordinary dividends, use the familiar order with the ex-date first.
How long is the due bill period?
It runs from the record date through the session before the ex-date. The length depends on the gap a company leaves between its record date and its payable date, which is usually a small number of business days.
What happens if I sell during the due bill period?
The entitlement travels with the shares. If the distribution is credited to your account on the payable date, your broker moves it to the buyer when the due bills are redeemed, and your position ends up matching what you actually own.
Do reverse splits use due bills?
No. A reverse split is processed as an exchange of old shares for new ones, with the adjusted price quoted from the effective date. There is no window in which the old price and the new share count are both live.
Every panel here carries the SQL that produced it, expand one to see how each count was taken. To trace a split session by session, or to find the distributions that went ex after they were paid, ask the question in plain English on the Strasmore terminal.