ARKK vs IBB: Holdings Overlap
ARK · 45 holdings · $6.0B · as of 2026-04-30
iShares · 254 holdings · $9.3B · as of 2026-03-31
Holdings snapshots are 30 days apart (ARKK: 2026-04-30, IBB: 2026-03-31). 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 IBB?
ARK Innovation ETF (ARKK, by ARK) holds 45 positions; iShares Biotechnology ETF (IBB, by iShares) holds 254. They have 11 holdings in common, and by portfolio weight the two funds are 4.4% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 4.4%Sum of the smaller weight of each shared holding
- Shared Holdings
- 11ARKK holds 45 · IBB holds 254
- Weight in Shared Holdings
- ARKK 26%·IBB 6%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
34 of 45 positions (74.4% of the fund) are not held by IBB. Showing the top 30 by weight.
Sector Breakdown
| Sector | ARKK | IBB |
|---|---|---|
| Health Care | 26.7% | 91.0% |
| 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% | 8.9% |
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, 9% of IBB).
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% | — |
| IBB | -0.3% | +17.3% | +51.0% | +16.4% | +3.1% | +7.4% | 0.21% |
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 IBB →
Shared Holdings(11)
The top 10 shared positions account for 99% of the overlap, led by ILMN, NTRA and TEM.
 ILMNIllumina Inc COM | 1.20% | 1.68% | 1.20% |
|---|---|---|---|
 NTRANatera Inc. COM | 1.17% | 2.41% | 1.17% |
 TEMTempus AI, Inc., Class A | 5.36% | 0.43% | 0.43% |
 1CGCRISPR Therapeutics AG COM CHF0.03 | 4.98% | 0.39% | 0.39% |
 TWSTTwist Bioscience Corporation COM | 3.05% | 0.26% | 0.26% |
 VCYTVeracyte Inc COM | 0.89% | 0.23% | 0.23% |
 TXG10X Genomics, Inc., Class A | 2.31% | 0.22% | 0.22% |
 BEAMBeam Therapeutics Inc. COM | 3.06% | 0.20% | 0.20% |
 NTLAIntellia Therapeutics Inc COM | 2.06% | 0.13% | 0.13% |
 RXRXRecursion Pharmaceuticals, Inc., Class A | 1.16% | 0.13% | 0.13% |
 PACBPacific Biosciences Of California Inc. COM | 0.36% | 0.03% | 0.03% |
Frequently Asked Questions
How much do ARKK and IBB overlap?
ARKK and IBB overlap by 4.4% of portfolio weight. They share 11 holdings (ARKK holds 45 positions and IBB holds 254), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ARKK and IBB?
The two portfolios are 4.4% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of ARKK and IBB?
The largest positions held by both funds are ILMN, NTRA, TEM, 1CG and TWST. Together the top 10 shared positions account for 99% of the total overlap.
What does ARKK own that IBB doesn't?
34 positions (74.4% of ARKK) are unique to ARKK, led by TSLA, AMD and SHOP. In the other direction, 243 positions (93.7% of IBB) are unique to IBB.