ARKG vs XBI overlap - what they share and where they differ
ARKG and XBI share 9.8% of their weight across 12 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.
ARKG and XBI
9.8%
12 shared positions
ARKG
ARK Genomic Revolution ETF
Reported positions cover 100% of the fund, 32 positions · Jul 31, 2026
Top 10: 59.1%·Holdings of ARKG
XBI
State Street(R) SPDR(R) S&P(R) Biotech ETF
Reported positions cover 100% of the fund, 149 positions · Jun 30, 2026
Top 10: 13.3%·Holdings of XBI
Reported positions cover ARKG 100%, XBI 100% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
XBI vs ARKG side by side
ARKGARK Genomic Revolution ETF
32
stock positions reported to the SEC
55.6% of its weight is in 20 names XBI does not hold
XBIState Street(R) SPDR(R) S&P(R) Biotech ETF
149
stock positions reported to the SEC
90.1% of its weight is in 137 names ARKG does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Healthcare: XBI has 7.3 points more of it.
The figures side by side
| ARKG | XBI | |
|---|---|---|
| Filing date | Jul 31, 2026 | Jun 30, 2026 |
| Stock positions reported | 32 | 149 |
| Weight of the ten largest | 59.1% | 13.3% |
| Largest position | TXG 9.4% | APOGEE THERAPEUTICS INC 1.5% |
| Held alone | 20 positions, 55.6% | 137 positions, 90.1% |
| Covered by stock positions | 100% | 100% |
Holdings they share
| Stock | In ARKG | In XBI | Counted |
|---|---|---|---|
| TWSTTWIST BIOSCIENCE CORP | 7.73% | 1.41% | 1.41% |
| NTRANATERA INC | 4.13% | 1.16% | 1.16% |
| BEAMBEAM THERAPEUTICS INC | 3.78% | 1.08% | 1.08% |
| CRSPCRISPR THERAPEUTICS AG | 6.29% | 1.02% | 1.02% |
| IONSIONIS PHARMACEUTICALS INC | 1.77% | 1.00% | 1.00% |
| NTLAINTELLIA THERAPEUTICS INC | 1.83% | 0.91% | 0.91% |
| VCYTVERACYTE INC | 2.55% | 0.82% | 0.82% |
| RXRXRECURSION PHARMACEUTICALS INC | 2.63% | 0.76% | 0.76% |
| ABSIABSCI CORP | 5.14% | 0.56% | 0.56% |
| NRIXNURIX THERAPEUTICS INC | 2.51% | 0.56% | 0.56% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in ARKG
Only in XBI
Questions people ask
Is ARKG the same as XBI?
9.8% of their weight sits in the same 12 holdings. ARKG also reports TXG, TEM, PSNL, which the other does not. XBI also reports APOGEE THERAPEUTICS INC, MRNA, ORKA, which the other does not.
How is the overlap between ARKG and XBI 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 ARKG and 100% of XBI, so the number cannot exceed the smaller coverage.
Which holds more, XBI or ARKG?
ARKG reports 32 stock positions and XBI reports 149. 55.6% of ARKG's weight sits in names XBI does not hold, and 90.1% of XBI's weight in names ARKG does not hold. The ten largest positions are 59.1% of ARKG and 13.3% of XBI.
How do ARKG and XBI differ by sector?
The widest gap is Healthcare: XBI has 7.3 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.