how many times has costco stock split

Costco stock split history

Short answer (what this page answers): how many times has costco stock split, which dates and ratios are reported by common data providers, why some sources disagree, and where to verify the official record.

As of 2026-01-13, according to the secondary data providers cited below, this article compiles the commonly reported split events for Costco Wholesale Corporation (ticker: COST) and explains how to confirm the authoritative history using Costco investor relations and SEC filings.

Introduction — what this page covers and why it matters

If you searched "how many times has costco stock split," you likely want a concise, verifiable history of Costco Wholesale Corporation's share splits, plus context on how those splits affect share counts, historical prices, and investor records. This page collects reported split events from leading data aggregators, highlights discrepancies between sources, explains what a stock split does, and shows how to verify the official record using primary documents (Costco IR and SEC EDGAR). It also explains how splits appear in adjusted price and dividend history and gives a worked example for adjusting a sample holding.

Note: this article is descriptive and factual. It does not provide investment advice. Always confirm corporate-action details using primary filings and company announcements before updating cost bases or reporting holdings.

Background: Costco at a glance and why splits matter

Costco Wholesale Corporation (COST) is a large-cap membership warehouse retailer traded on a major U.S. market under the ticker COST. Share splits are corporate actions that change the number of outstanding shares and the per-share price without altering the company’s total market capitalization (absent new issuance). Investors and record-keepers care about splits because splits change share counts for existing holders, affect historical price comparisons, and require split-adjusted reporting for correct performance metrics and tax records.

For readers focused on the query how many times has costco stock split: this page gathers the split events most commonly reported by reputable secondary sources, notes where those sources disagree, and explains how to confirm the authoritative count.

What is a stock split? (brief primer)

• A forward stock split increases the number of outstanding shares and proportionally reduces the price per share (for example, a 2-for-1 split doubles shares and halves the per-share price).
• A reverse split reduces the number of outstanding shares and increases the per-share price (for example, a 1-for-10 reverse consolidates ten shares into one).
• Splits do not change a company’s market capitalization in themselves — the company’s value remains the same immediately after a split absent market movement.
• Historical price series and dividend records are normally adjusted for splits so that long-term charts and total-return calculations remain consistent.

When answering how many times has costco stock split, we therefore list the forward splits (date and ratio) reported by data providers and explain how those events are reflected in adjusted histories.

Official split count and summary (what secondary sources report)

Short summary: Secondary data providers commonly report either two or three split events for Costco in the 1990s and 2000s. The most widely reported confirmed splits are in the 1990s and 2000; a small number of aggregators include an additional earlier event that some others do not list. Because sources disagree, rely on Costco’s own investor-relations announcements and SEC corporate-action filings (8-Ks, press releases) for authoritative confirmation.

Reported counts by major secondary sources (examples):

• Macrotrends: reports two splits (commonly the 1993 and 2000 splits). (As of 2026-01-13, Macrotrends shows the split entries summarized later.)
• SplitHistory: lists split events and may include the same two splits; check the specific entries for date detail. (As of 2026-01-13, SplitHistory lists the splits summarized below.)
• CheddarFlow (article summarizing Costco split history): provides narrative and context and references the commonly listed split dates.
• Motley Fool: commentary on Costco’s share history and split occurrences.
• StatMuse / Statmuse Money Q&A pages: often answer the direct user query "how many times has costco stock split" with an enumerated count.

Discrepancy note: A few sources occasionally show a third earlier split (often cited around 1991) while others do not. This page lists the splits that are widely corroborated, states the disputed entry explicitly, and shows how to verify the authoritative record via primary filings.

Detailed split chronology

Intro: below are the split events most commonly reported for COST, listed with the date, ratio, and concise context. Where sources disagree, a short discrepancy note appears beneath the entries.

Reported split: October 1993 — 2-for-1 (commonly reported)

• Reported effective date (commonly cited): October 22, 1993 (some sources list anOctober 1993 event). The commonly quoted ratio is 2-for-1.
• Context: During the early 1990s Costco was expanding its membership-warehouse business rapidly following the company's post-Price Club era growth; a forward split at that time would have increased shares outstanding for retail investors and improved accessibility by lowering the per-share price.
• Sources that list this event: Macrotrends, SplitHistory, several financial articles. (As of 2026-01-13, these aggregators include an entry for a 1993 split.)

Reported split: January 2000 — 2-for-1 (commonly reported)

• Reported effective date (commonly cited): January 14, 2000 (a 2-for-1 forward split is frequently referenced in data aggregators).
• Context: The late 1990s were a growth phase for many retail names; a 2000 split would be consistent with other corporate-actions patterns for large-cap retailers that had rising share prices.
• Sources that list this event: Macrotrends, SplitHistory, StatMuse, dividend/history aggregators. (As of 2026-01-13, multiple providers include a 2000 split entry for COST.)

Disputed/less consistently reported split: ca. 1991 — possible 2-for-1 (disputed)

• Some secondary sources and older aggregated histories include a split entry near 1991. However, this entry is not consistently present across major data aggregators.
• Discrepancy note: Because this 1991 entry appears in some histories but not others, it should be verified against primary documents before being treated as definitive. Primary documents include Costco investor-relations announcements, press releases, and SEC filings (8-Ks and historical annual reports) that record corporate actions.

Timeline summary table (concise)

Below is a concise table summarizing the split entries commonly cited by secondary sources. The table is intended as a replication-friendly summary for editors; before publishing any definitive claim, verify each row against company press releases or SEC filings.

| Reported date (common) | Ratio | Sources (secondary) | Notes | |---|---:|---|---| | Oct 1993 | 2-for-1 | Macrotrends, SplitHistory, CheddarFlow | Widely reported; verify with Costco IR/SEC | | Jan 2000 | 2-for-1 | Macrotrends, SplitHistory, StatMuse | Widely reported; verify with Costco IR/SEC | | ca. 1991 (disputed) | 2-for-1 (reported by some) | Some archival aggregators | Inconsistent across sources — verify with primary filings |

Source-of-truth / verification: where to check the authoritative record

To resolve the question how many times has costco stock split with certainty, the authoritative documents are primary corporate filings and company announcements. Recommended verification steps:

1. Costco Investor Relations (company press releases and historical news/archive pages). Look for press releases announcing stock splits and effective dates.
2. SEC EDGAR search for Costco Wholesale Corporation. Check 8-Ks and historical 10-K or proxy statements that record corporate actions and share capital changes.
3. Transfer agent records (for historical share-count adjustments). Transfer agents maintain formal records of split processing, though access to historical transfer-agent detail may require direct inquiry.
4. Exchange corporate-action notices (the exchange where COST is listed provides corporate action bulletins historically).
5. Reputable data aggregators (Macrotrends, SplitHistory, StatMuse) are useful cross-checks but should be treated as secondary and reconciled against primary filings.

If you maintain or publish financial data, record the source and access date for each split entry, because aggregator displays occasionally adjust as providers reconcile older records.

Effect on historical prices and dividends

• Most price charts, total-return calculators, and dividend histories you see on financial websites will be split-adjusted so that long-term comparisons are consistent. That means historical prices are reduced or increased by the reverse ratio so that the time series is continuous and comparable.
• Dividend records are also typically presented on a split-adjusted basis; when a stock split occurs, per-share dividends are adjusted pro rata to reflect the new share count.
• For accounting and tax purposes, a stock split generally does not trigger a taxable event in the U.S.; instead, your cost basis per share is adjusted. If multiple splits occurred, multiply the original shares by each forward split factor to compute the current share count equivalent.

Worked formula for forward splits: New share count = Original share count × product of forward-split factors.

Worked formula for cost basis per share after splits: New cost basis per share = Original total cost / New share count.

Example (see Appendix B for a detailed worked example using the reported splits): if a shareholder originally owned 100 shares and the company completed two 2-for-1 splits, the new share count after both splits would be 100 × 2 × 2 = 400 shares; the per-share cost basis would be one-quarter of the original per-share basis.

How split events are reported by data providers (notes on adjustment practice)

• Different providers may show event dates as either the announcement date or the effective (distribution) date. When reconciling sources, confirm whether the listed date is the board announcement date or the effective distribution date when extra shares are delivered to shareholders.
• Always confirm the exact effective date from a primary filing or the company’s press release, because record dates and payment/effective dates can differ by a few business days.

Market and investor impact (observed/contextual)

• A forward split typically increases the number of tradable shares and lowers the per-share price, which can make the stock more accessible to retail investors if the per-share price was previously high.
• Empirical academic findings on whether splits lead to sustained outperformance are mixed; some observers view splits as a signal of management confidence in growth, while others treat them as largely cosmetic.
• For Costco specifically, secondary commentary has focused on the company’s steady membership-driven model and long-term earnings profile rather than on frequent corporate-actions activity.

Evidence and commentary: financial commentaries from sources such as Motley Fool and CheddarFlow discuss split timing and investor sentiment around the events. Remember to treat secondary narrative as context rather than primary evidence of the split itself.

Comparisons with peers

• Large-cap retail and technology companies have varied approaches to splits. Some companies split frequently during rapid price appreciation, while others rarely split their stock. Costco’s split frequency (two commonly reported forward splits across several decades, plus any disputed earlier entry) would place it at the lower-to-moderate frequency end compared with highly active splitters in tech.
• Examples of varied policies: some large-cap names have split multiple times as they scaled, while others maintained high per-share prices without splits.

Appendix A: Frequently reported but disputed entries

• Entry in question: circa 1991 split — appears in a minority of secondary aggregators but is omitted from several others. If you see a 1991 split cited, verify by:
  • Checking Costco IR historical press releases for 1991.
  • Searching SEC filings for 1991–1994 for mention of a stock split or share-consolidation action.
  • Reviewing archived exchange corporate action notices for relevant dates.

If no company press release or SEC filing is found for the disputed date, treat the entry as unconfirmed.

Appendix B: Worked example — how to adjust historical holdings for reported splits

Assume a shareholder purchased 100 shares of COST at $50 per share at a hypothetical purchase date earlier than the reported split events. For illustration, apply the two commonly reported splits (1993 2-for-1 and 2000 2-for-1). If a disputed 1991 2-for-1 split were confirmed, adjust accordingly as shown.

• Original position: 100 shares at $50 = $5,000 total cost.
• After a 2-for-1 split: shares = 100 × 2 = 200. Cost per share = $5,000 / 200 = $25.
• After a second 2-for-1 split: shares = 200 × 2 = 400. Cost per share = $5,000 / 400 = $12.50.

If a disputed 1991 2-for-1 split were confirmed prior to the 1993 and 2000 splits, the final share count would be 100 × 2 × 2 × 2 = 800 shares, and per-share cost = $5,000 / 800 = $6.25.

This worked example shows why confirming the complete split history matters when reporting share counts and per-share cost basis.

Practical checklist: confirming and recording splits

1. Locate company press release announcing the split (Costco IR archive).
2. Cross-check the press release against the SEC filing (8-K or similar) that records the board action.
3. Note the announcement date, record date (if applicable), and effective distribution date.
4. Update internal records: multiply share counts and recompute per-share basis using the product of forward split ratios.
5. Document the primary source (press release or SEC filing) with accession number and access date for audit trails.

References and prioritized sources to consult

Priority for verification:

• Primary: Costco Investor Relations press releases and SEC filings (EDGAR corporate filings). These are the authoritative sources for corporate actions.
• Secondary cross-checks: Macrotrends split history pages, SplitHistory, StatMuse, CheddarFlow, Motley Fool, DividendChannel, and financial data vendors. Use these as checks but prefer primary filings for definitive records.

As of 2026-01-13, secondary aggregators listed the split entries summarized above; always include the access date when citing them.

External links and where to look (no URLs included)

• Costco Investor Relations (company site) — search the site’s press-release or news archive for stock-split announcements.
• SEC EDGAR — search for Costco Wholesale Corporation filings (8-K, 10-K, proxy statements) that mention share splits and corporate actions.
• Reputable data aggregators — search split-history pages for COST to cross-check dates and ratios, then reconcile with primary documents.

Notes for editors / maintainers

• Before publishing a definitive lead statement of exactly how many times Costco has split its stock, confirm each listed split against Costco’s official press releases or SEC filings and record the date accessed.
• If you present the count in the article lead, include a citation to the primary filing(s) verifying each split.
• When adding the split table to a live page, include a column for the primary-source citation (press release or SEC accession number) and the date you accessed it.

Market-data context and timely reporting (timeliness note)

• As of 2026-01-13, secondary split-history aggregators list the events summarized above. For real-time market metrics such as current market capitalization or average daily volume, consult a real-time market quote or a financial-data provider and cite the access date. Numbers such as market cap and volume change daily; this article focuses on corporate-action history rather than intraday market metrics.

• If you require the latest market-cap and trading-volume numbers when updating this page, follow these steps:

  1. Query a reliable market-data provider and document the access date.
  2. Record market cap, average daily shares traded (or average dollar volume), and any corporate news affecting share count.

Market integrity and data reliability (practical advice)

• Aggregated historical data can include transcription errors for older events. When an older split appears in only one source, check the primary filings first.
• If a discrepancy remains after searching public filings and the investor-relations archive, contact the company’s investor-relations office or the transfer agent for a definitive historical record.

More about interpreting corporate-action dates

• Announcement date: when the company publicly announces the split.
• Record date: the date the company uses to identify shareholders eligible to receive the split shares (if applicable).
• Effective/distribution date: the date when the additional shares are actually issued and begin trading on a split-adjusted basis.

When reconciling sources, ensure you know which of these dates is being displayed by each provider.

Further reading and related topics

• Stock split (definition and mechanics)
• Reverse split (why a company might consolidate shares)
• Corporate actions and adjusted price histories
• How to compute adjusted cost basis after corporate actions

Brand note and call to action

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Editor checklist before publishing definitive counts

• Verify each split entry against Costco press releases and SEC filings, and store the primary-source citation.
• If you update the lead to state a definitive count (for example, "Costco has split X times"), ensure the primary-source citations are listed immediately after that claim.
• Keep an audit field for "date verified" to record when the primary sources were checked.

Article prepared to answer the user query "how many times has costco stock split" and to guide verification using primary documents. Secondary sources cited in this compilation were consulted as aggregator references as of 2026-01-13.