ARKK vs XBI: Holdings Overlap
ARK · 45 holdings · $6.0B · as of 2026-04-30
XBIState Street® SPDR® S&P® Biotech ETF
State Street (SPDR) · 149 holdings · $10.0B · as of 2026-08-06
Holdings snapshots are 98 days apart (ARKK: 2026-04-30, XBI: 2026-08-06). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are ARKK and XBI?
ARK Innovation ETF (ARKK, by ARK) holds 45 positions; State Street® SPDR® S&P® Biotech ETF (XBI, by State Street (SPDR)) holds 149. They have 7 holdings in common, and by portfolio weight the two funds are 6.6% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 6.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 7ARKK holds 45 · XBI holds 149
- Weight in Shared Holdings
- ARKK 16%·XBI 7%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in ARKK
38 of 45 positions (83.7% of the fund) are not held by XBI. Showing the top 30 by weight.
Only in XBI
142 of 149 positions (93.4% of the fund) are not held by ARKK. Showing the top 30 by weight.
Sector Breakdown
| Sector | ARKK | XBI |
|---|---|---|
| Health Care | 26.7% | 95.5% |
| Information Technology | 26.0% | 0.0% |
| Financials | 16.8% | 0.0% |
| Consumer Discretionary | 13.3% | 0.0% |
| Communication Services | 10.5% | 0.0% |
| Other Sectors | 4.8% | 0.0% |
| Unclassified | 1.8% | 4.6% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts. “Unclassified” is weight we could not classify (2% of ARKK, 5% of XBI).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| ARKK | -2.2% | +3.3% | +6.8% | +21.1% | -8.1% | +15.3% | — |
| XBI | -4.0% | +29.2% | +85.3% | +26.3% | +4.5% | +9.5% | 0.36% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in ARKK vs XBI →
Shared Holdings(7)
The top 7 shared positions account for 100% of the overlap, led by TWST, NTRA and 1CG.
 TWSTTwist Bioscience Corporation COM | 3.05% | 1.56% | 1.56% |
|---|---|---|---|
 NTRANatera Inc. COM | 1.17% | 1.18% | 1.17% |
 1CGCRISPR Therapeutics AG COM CHF0.03 | 4.98% | 1.01% | 1.01% |
 BEAMBeam Therapeutics Inc. COM | 3.06% | 0.89% | 0.89% |
 RXRXRecursion Pharmaceuticals, Inc., Class A | 1.16% | 0.68% | 0.68% |
 VCYTVeracyte Inc COM | 0.89% | 0.67% | 0.67% |
 NTLAIntellia Therapeutics Inc COM | 2.06% | 0.63% | 0.63% |
Frequently Asked Questions
How much do ARKK and XBI overlap?
ARKK and XBI overlap by 6.6% of portfolio weight. They share 7 holdings (ARKK holds 45 positions and XBI holds 149), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ARKK and XBI?
The two portfolios are 6.6% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of ARKK and XBI?
The largest positions held by both funds are TWST, NTRA, 1CG, BEAM and RXRX. Together the top 7 shared positions account for 100% of the total overlap.
What does ARKK own that XBI doesn't?
38 positions (83.7% of ARKK) are unique to ARKK, led by TSLA, TEM and AMD. In the other direction, 142 positions (93.4% of XBI) are unique to XBI.