Megacap Buybacks and Diluted Share Count: Are Repurchases Shrinking Shares?
$227.475 billion of observed repurchases did not guarantee a shrinking diluted share count.
Among the nine unique companies behind the S&P 500's ten largest security lines on September 9, 2026, seven had observable canonical stock-repurchase facts for their selected latest annual periods. Six showed positive repurchases. Five of those six also reduced diluted weighted-average shares, while Broadcom increased its diluted share count by 1.57%.
Apple accounted for the largest observed repurchase total
The seven covered issuers reported $227.475 billion of canonical stock-repurchase payments in their selected latest annual periods. Apple alone accounted for $90.711 billion. Micron's canonical value was an explicit zero.
Observed stock repurchases
Observed stock repurchases in billions of U.S. dollars for the seven covered issuers.
What this study can and cannot say
Year-over-year change in diluted weighted-average shares for each issuer, paired with canonical stock-repurchase payments when those facts are observable.
Diluted weighted-average shares are not point-in-time shares outstanding. The study does not attribute dilution specifically to stock-based compensation or calculate how many shares each repurchase dollar retired.
The nine companies come from the September 9, 2026 S&P 500 top-holdings snapshot. The ten security lines represented 38.09% of the index, with Alphabet appearing twice because its two share classes are separately weighted securities.
Methodology and limitations
For each issuer, use the latest normalized annual period with diluted weighted-average shares publicly filed by the filing cutoff. Net income and stock repurchases are optional secondary observations from that same selected period.
Use the latest earlier normalized annual period ending 300 to 430 days before the selected latest period and containing diluted weighted-average shares.
The selected latest annual period must end no more than 430 days before the filing cutoff; older observations fail measurement review rather than silently representing the current cohort.
Treat canonical stock-repurchase cash-flow facts as payment magnitudes by using the absolute reported value.
Share counts are company-specific units and must not be summed across issuers. Cross-company summaries may count direction of change and sum dollar-denominated repurchases only across issuers with observed repurchase facts.
Measurements use the SEC Company Facts API ↗. The public download contains the reviewed derived company rows, not raw SEC Company Facts records.
Download the reviewed company comparison
Research data
- Download CSVCSVCompany comparison CSVNine company rows with top-10 index weight, selected annual periods, diluted-share changes, observed repurchase values, coverage flags, and public accounting-concept provenance.Data snapshot September 21, 2026 · Reuse with attribution to the canonical study.
- Download JSONJSONBuybacks and share-count JSONStructured public research data with cohort metadata, coverage counts, company comparisons, selected findings, SEC Company Facts source link, and methodology boundaries. CIKs, raw SEC records, source IDs, hashes, approval metadata, and review-gate internals are excluded.Data snapshot September 21, 2026 · Reuse with attribution to the canonical study.
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Citation and reuse
When citing the $227.475 billion total, describe it as the sum across the seven issuers with observable canonical repurchase facts, not all nine companies. When citing the share-count result, describe diluted weighted-average shares as an earnings denominator rather than point-in-time shares outstanding. For methodology questions or corrections, contact Grizzly Bulls research.