The most duplicated US ETF pairs

Edited by VoidLab· Data through 2026-10-28· Last revised 2026-10-29

Of the 94,830 pairs that the 436 US ETFs with a page and an issuer file can form, the two funds that duplicate each other most are IVV and SPY: 99.9% of their weight sits in the same 503 companies, on issuer files dated 2026-10-27. The median pair overlaps by 0%, 0.8% of pairs sit above 60% and 0.1% above 90%. Hold both funds of a pair near the top of this page and you add weight to the same companies rather than to new ones.

Download both rankings as CSV or the dated series of the whole distribution, one line per holdings state. The data is published under CC BY 4.0: use it, including commercially, with attribution to TickerInside and a link to this page. Every row below has its own anchor, so a single pair can be linked directly, as in /most-duplicated-etf-pairs/#ivv-spy.

Which US ETF pairs are the most duplicated?

IVV and SPY lead at 99.9%, followed by IVW and SPYG at 99.9% and QQQ and QQQM at 99.9%. The 25 pairs below involve 33 funds; 17 of the pairs overlap by 98% or more inside one category, which is the rule this page uses for two funds tracking the same index, and 13 of the 25 pair funds from two different issuers. The lowest figure in the table is 96.4%, for SPYM and SPYX.

Columns, in both tables: Overlap is the overlap by weight; First in second is the share of the first fund's weight held in companies the second also holds, and Second in first reads the other way; In both is the number of companies held by both funds; Files gives the dates of the two issuer files, one date when they match.

Rows at 98% or more are marked. Compare opens the written comparison where one exists, and the ETF overlap calculator with both tickers filled in for every other pair.

Which pairs duplicate each other without tracking the same index?

Among funds that do not track the same index by the rule below, the most duplicated pair is QQQ and QYLD at 99.5%, QQQ in US Large Blend and QYLD in Option Income, with 101 companies in both and 100.0% of QQQ also held in QYLD. 17 pairs meet the same-index rule and are left out of this table. A pair on one index whose two files are dated weeks apart, or whose issuers spell a share class differently, can fall under the rule's line and land here, which is why both file dates are printed on every row.

Same index, as this page counts it: overlap by weight of 98% or more between two funds in the same category, TickerInside's own, set from each fund's holdings (how). It is a rule applied to the figures, not a registry of which index each fund follows.

Cite this page

TickerInside, "The most duplicated US ETF pairs", issuer files through 2026-10-28, tickerinside.com/most-duplicated-etf-pairs/. The figures change when issuers publish new files, so a citation should carry the date it was read; the CSV and the series above keep every earlier state.

How is duplication measured here?

Overlap by weight is the sum, company by company, of the smaller weight each shared company has in the two funds, computed from the issuers' own holdings files with no estimate in between; a company at 6% of one fund and 4% of the other contributes 4 points. The share of one fund held in the other is the part of that fund's own weight sitting in companies the other also holds, so it reads differently from each side, and a small fund can be almost entirely inside a large one while making up a fraction of it. Companies in both is a plain count. A currency-hedged fund's file lists its underlying fund beside the forwards that hedge it, so its weights can sum to about 200% and its share held in common reads near 50% while the overlap by weight reads near 100%. Each fund's file is dated on its issuer's own schedule, so the two dates in a row are usually different, and a figure is only as current as the older of the two. The full definitions, with the return and correlation measures used elsewhere on the site, are on how the numbers are produced.

This page is rebuilt from the current files every trading day, so a row moves when an issuer publishes a new file. Any pair not shown here answers in the overlap calculator, in the portfolio x-ray for a whole basket, through the JSON API, or from an assistant through the MCP server. The 436 funds in the census are the ones on the fund index whose holdings come from their issuers' files; the 158 whose holdings come from an SEC filing are left out, so that every row compares two issuer files.

Holdings from the issuer files behind the pairs listed, dated 2026-10-24 to 2026-10-28. Prices through 2026-10-28. Measurements of what funds hold, not investment advice.