ETF overlap

IBB vs VTWO overlap - what they share and where they differ

IBB and VTWO share 10.8% of their weight across 168 common positions, read from what each fund reported to the SEC.

Each week Ploutos reads the equity positions the largest US ETFs report to the SEC and works out the overlap of every pair. For each stock both hold, we use the smaller of its two weights.

IBB and VTWO

10.8%

168 shared stocks

IBBiShares Biotechnology ETF

Holdings of IBB

Stock positions reported: 238
Weight of the ten largest: 44.7%
Only here, not in VTWO: 74.7%

VTWOVanguard Russell 2000 Index Fund

Holdings of VTWO

Stock positions reported: 1,966
Weight of the ten largest: 3.2%
Only here, not in IBB: 88.9%

Positions coveredIBB 100%VTWO 100%Filings: Jun 30, 2026, Aug 31, 2026

IBB vs VTWO side by side

The same figures from the two funds' filings, side by side.

Largest sectors for both funds

IBBVTWO

The widest gap is Healthcare: IBB has 78.2 points more of it.

Filing date
IBBJun 30, 2026
Stock positions reported
IBB238
Weight of the ten largest
IBB44.7%
Largest position
IBBVRTX 8.1%
Held alone
IBB70 positions, 74.7%
Covered by stock positions
IBB100%

	IBB	VTWO
Filing date	Jun 30, 2026	Aug 31, 2026
Stock positions reported	238	1,966
Weight of the ten largest	44.7%	3.2%
Largest position	VRTX 8.1%	FROG 0.4%
Held alone	70 positions, 74.7%	1,798 positions, 88.9%
Covered by stock positions	100%	100%

What each holds alone

The heaviest positions one fund reports and the other does not.

Only in IBB

70 positions only here, 74.7% of the fund

VRTXVertex Pharmaceuticals, Inc.8.08%
AMGNAmgen, Inc.7.83%
GILDGilead Sciences, Inc.6.84%
REGNRegeneron Pharmaceuticals, Inc.4.91%
ARGXArgenx SE3.76%
ALNYAlnylam Pharmaceuticals, Inc.3.12%
NTRANatera, Inc.2.89%
RVMDRevolution Medicines, Inc.2.78%
BIIBBiogen, Inc.2.47%
ILMNIllumina, Inc.2.07%

Only in VTWO

1,798 positions only here, 88.9% of the fund

FROGJFrog Ltd0.35%
MOG.AMoog Inc0.34%
GKOSGlaukos Corp0.33%
UMBFUMB Financial Corp0.33%
EATBrinker International Inc0.32%
BTSGBrightSpring Health Services Inc0.30%
ONBOld National Bancorp0.29%
SMSM Energy Co0.29%
CTRECareTrust REIT Inc0.28%
FCFSFirstCash Holdings Inc0.28%

Holdings they share

168 shared stocks

CYTKCytokinetics, Inc.
Counted0.30%
KRYSKrystal Biotech, Inc.
Counted0.30%
PTGXProtagonist Therapeutics, Inc.
Counted0.29%
TWSTTwist Bioscience Corp.
Counted0.29%
CRINETICS PHARMACEUTICALS INCCrinetics Pharmaceuticals, Inc.
Counted0.28%
PRAXPraxis Precision Medicines, Inc.
Counted0.28%
PCVXVaxcyte, Inc.
Counted0.26%
ALKSAlkermes plc
Counted0.25%
KYMRKymera Therapeutics, Inc.
Counted0.24%
TXG10X Genomics, Inc.
Counted0.24%

Stock	In IBB	In VTWO	Counted
CYTKCytokinetics, Inc.	0.79%	0.30%	0.30%
KRYSKrystal Biotech, Inc.	0.75%	0.30%	0.30%
PTGXProtagonist Therapeutics, Inc.	0.58%	0.29%	0.29%
TWSTTwist Bioscience Corp.	0.48%	0.29%	0.29%
CRINETICS PHARMACEUTICALS INCCrinetics Pharmaceuticals, Inc.	0.29%	0.28%	0.28%
PRAXPraxis Precision Medicines, Inc.	0.68%	0.28%	0.28%
PCVXVaxcyte, Inc.	0.64%	0.26%	0.26%
ALKSAlkermes plc	0.67%	0.25%	0.25%
KYMRKymera Therapeutics, Inc.	0.64%	0.24%	0.24%
TXG10X Genomics, Inc.	0.34%	0.24%	0.24%

Other pairs with these funds

VTWO against other funds in the table

IWM vs VTWO89.9%

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Questions people ask

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Is IBB the same as VTWO?

10.8% of their weight sits in the same 168 holdings. IBB also reports VRTX, AMGN, GILD, which the other does not. VTWO also reports FROG, MOG.A, GKOS, which the other does not.

How is the overlap between IBB and VTWO 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 IBB and 100% of VTWO, so the number cannot exceed the smaller coverage.

Which holds more, VTWO or IBB?

IBB reports 238 stock positions and VTWO reports 1,966. 74.7% of IBB's weight sits in names VTWO does not hold, and 88.9% of VTWO's weight in names IBB does not hold. The ten largest positions are 44.7% of IBB and 3.2% of VTWO.

How do IBB and VTWO differ by sector?

The widest gap is Healthcare: IBB has 78.2 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.

US stocksThe market today, the sectors, the largest companies and the week's results.US dividend stocksEach dividend's yield next to whether the company's cash covers it and whether it was ever cut.Bond ETFsWhat each bond ETF's bonds yield, how far its price would fall if rates rose, and how it did in 2022.Methodology and sourcesWhere every figure comes from and how it is checked.

Descriptive data from public SEC filings. Holdings change between filings.