ARKX vs XAR overlap - what they share and where they differ
ARKX and XAR share 18.5% of their weight across 9 common positions, read from what each fund reported to the SEC.
Each week Ploutos reads the reported positions of the largest US equity ETFs and measures, pair by pair, the weight they share: for every stock both funds hold, the smaller of the two weights counts. Two funds tracking the same index land near 100%. A sector fund inside a broad index fund lands at roughly that sector's weight.
ARKX and XAR
18.5%
9 shared positions
ARKX
ARK Space & Defense Innovation ETF
Reported positions cover 100% of the fund, 34 positions · Jul 31, 2026
Top 10: 54.5%·Holdings of ARKX
XAR
State Street(R) SPDR(R) S&P(R) Aerospace & Defense ETF
Reported positions cover 100% of the fund, 47 positions · Jun 30, 2026
Top 10: 30.4%·Holdings of XAR
Reported positions cover ARKX 100%, XAR 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
XAR vs ARKX side by side
ARKXARK Space & Defense Innovation ETF
34
stock positions reported to the SEC
67.4% of its weight is in 25 names XAR does not hold
XARState Street(R) SPDR(R) S&P(R) Aerospace & Defense ETF
47
stock positions reported to the SEC
77.6% of its weight is in 38 names ARKX does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Industrials: XAR has 36.7 points more of it.
The figures side by side
| ARKX | XAR | |
|---|---|---|
| Filing date | Jul 31, 2026 | Jun 30, 2026 |
| Stock positions reported | 34 | 47 |
| Weight of the ten largest | 54.5% | 30.4% |
| Largest position | SPCX 7.7% | VSEC 3.4% |
| Held alone | 25 positions, 67.4% | 38 positions, 77.6% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In ARKX | In XAR | Counted |
|---|---|---|---|
| RKLBROCKET LAB CORP | 4.74% | 2.49% | 2.49% |
| LHXL3HARRIS TECHNOLOGIES INC | 7.53% | 2.47% | 2.47% |
| AVAVAEROVIRONMENT INC | 4.53% | 2.46% | 2.46% |
| ACHRARCHER AVIATION INC (NEW) | 3.12% | 2.41% | 2.41% |
| KTOSKRATOS DEFENSE & SECURITY SOLUTIONS INC | 6.22% | 2.34% | 2.34% |
| HEIHEICO CORP | 1.92% | 2.86% | 1.92% |
| LUNRINTUITIVE MACHINES INC | 1.72% | 2.08% | 1.72% |
| BWXTBWX TECHNOLOGIES INC | 1.62% | 2.74% | 1.62% |
| LMTLOCKHEED MARTIN CORP | 1.03% | 2.50% | 1.03% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in ARKX
Only in XAR
Questions people ask
Is ARKX the same as XAR?
18.5% of their weight sits in the same 9 holdings. ARKX also reports SPCX, DE, AMD, which the other does not. XAR also reports VSEC, AXON, SARO, which the other does not.
How is the overlap between ARKX and XAR measured?
For every stock both funds report, the smaller of the two weights counts, and the sum is the overlap. The reported positions cover 100% of ARKX and 100% of XAR, so the number cannot exceed the smaller coverage.
Which holds more, XAR or ARKX?
ARKX reports 34 stock positions and XAR reports 47. 67.4% of ARKX's weight sits in names XAR does not hold, and 77.6% of XAR's weight in names ARKX does not hold. The ten largest positions are 54.5% of ARKX and 30.4% of XAR.
How do ARKX and XAR differ by sector?
The widest gap is Industrials: XAR has 36.7 points more of it. Sectors come from each holding's SIC code in its SEC record, summed by the weight the fund reports.
Where do the numbers come from?
From each fund's own N-PORT filing to the SEC, which lists every position and its weight. The comparison uses every equity position the fund reports; cash, futures and bonds are not counted, which is why a coverage figure sits next to every result. Holdings change between filings.
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Descriptive data from public SEC filings. Nothing on this page is a recommendation to buy, sell or hold any fund or stock, and holdings change between filings.