ARKG vs IBB: Holdings Overlap
ARKGARK Genomic Revolution ETF
ARK · 32 holdings · $1.6B · as of 2026-04-30
iShares · 254 holdings · $9.3B · as of 2026-03-31
Holdings snapshots are 30 days apart (ARKG: 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 ARKG and IBB?
ARK Genomic Revolution ETF (ARKG, by ARK) holds 32 positions; iShares Biotechnology ETF (IBB, by iShares) holds 254. They have 23 holdings in common, and by portfolio weight the two funds are 8.6% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 8.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 23ARKG holds 32 · IBB holds 254
- Weight in Shared Holdings
- ARKG 85%·IBB 9%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 ARKG
9 of 32 positions (14.4% of the fund) are not held by IBB.
Sector Breakdown
| Sector | ARKG | IBB |
|---|---|---|
| Health Care | 93.3% | 91.0% |
| Other Sectors | 0.0% | 0.0% |
| Unclassified | 6.3% | 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 (6% of ARKG, 9% of IBB).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| ARKG | +1.0% | +48.6% | +84.8% | +9.2% | -13.0% | +9.2% | — |
| 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 ARKG vs IBB →
Shared Holdings(23)
The top 10 shared positions account for 89% of the overlap, led by NTRA, ILMN and IONS.
 NTRANatera Inc. COM | 4.07% | 2.41% | 2.41% |
|---|---|---|---|
 ILMNIllumina Inc COM | 4.03% | 1.68% | 1.68% |
 IONSIonis Pharmaceuticals, Inc. COM | 1.74% | 1.11% | 1.11% |
 BNTXBioNTech SE, ADR | 1.06% | 0.66% | 0.66% |
 TEMTempus AI, Inc., Class A | 9.42% | 0.43% | 0.43% |
 1CGCRISPR Therapeutics AG COM CHF0.03 | 8.91% | 0.39% | 0.39% |
 TWSTTwist Bioscience Corporation COM | 8.99% | 0.26% | 0.26% |
 VCYTVeracyte Inc COM | 2.66% | 0.23% | 0.23% |
 TXG10X Genomics, Inc., Class A | 5.77% | 0.22% | 0.22% |
 BEAMBeam Therapeutics Inc. COM | 5.43% | 0.20% | 0.20% |
 ADPTAdaptive Biotechnologies Corp COM | 2.42% | 0.19% | 0.19% |
 NRIXNurix Therapeutics Inc. COM | 2.33% | 0.14% | 0.14% |
 NTLAIntellia Therapeutics Inc COM | 3.82% | 0.13% | 0.13% |
 RXRXRecursion Pharmaceuticals, Inc., Class A | 3.51% | 0.13% | 0.13% |
 ATAIAtaiBeckley, Inc. | 1.48% | 0.09% | 0.09% |
 CDNACaredx Inc COM | 3.38% | 0.07% | 0.07% |
 CMPSCompass Pathways plc | 2.43% | 0.04% | 0.04% |
 ABSIAbsci Corp. COM | 4.78% | 0.04% | 0.04% |
 PACBPacific Biosciences Of California Inc. COM | 1.41% | 0.03% | 0.03% |
 PSNLPersonalis, Inc. | 3.58% | 0.03% | 0.03% |
 PRMEPrime Medicine Inc COM | 1.41% | 0.03% | 0.03% |
 ARCTArcturus Therapeutics Holdings Inc COM | 1.96% | 0.02% | 0.02% |
 QSIQuantum Si Inc. COM CL A | 0.55% | 0.01% | 0.01% |
Frequently Asked Questions
How much do ARKG and IBB overlap?
ARKG and IBB overlap by 8.6% of portfolio weight. They share 23 holdings (ARKG holds 32 positions and IBB holds 254), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ARKG and IBB?
The two portfolios are 8.6% 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 ARKG and IBB?
The largest positions held by both funds are NTRA, ILMN, IONS, BNTX and TEM. Together the top 10 shared positions account for 89% of the total overlap.
What does ARKG own that IBB doesn't?
9 positions (14.4% of ARKG) are unique to ARKG, led by GH, WGS and SDGR. In the other direction, 231 positions (91.3% of IBB) are unique to IBB.