IWM vs LABU overlap - what they share and where they differ
IWM and LABU share 9.1% of their weight across 121 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.
IWM and LABU
9.1%
121 shared positions
IWM
iShares Russell 2000 ETF
Reported positions cover 100% of the fund, 1,966 positions · Jun 30, 2026
Top 10: 3.4%·Holdings of IWM
LABU
Direxion Daily S&P Biotech Bull 3X Shares
Reported positions cover 67% of the fund, 147 positions · Jul 31, 2026
Top 10: 9.4%·Holdings of LABU
Reported positions cover IWM 100%, LABU 67% of each fund. An overlap cannot exceed the smaller coverage, so a low figure can mean little overlap or thin reporting.
LABU vs IWM side by side
IWMiShares Russell 2000 ETF
1,966
stock positions reported to the SEC
90.7% of its weight is in 1,845 names LABU does not hold
LABUDirexion Daily S&P Biotech Bull 3X Shares
147
stock positions reported to the SEC
18.5% of its weight is in 26 names IWM does not hold
Where each fund's weight sits
Largest sectors for both funds
The widest gap is Healthcare: LABU has 47.1 points more of it.
The figures side by side
| IWM | LABU | |
|---|---|---|
| Filing date | Jun 30, 2026 | Jul 31, 2026 |
| Stock positions reported | 1,966 | 147 |
| Weight of the ten largest | 3.4% | 9.4% |
| Largest position | MOG.A 0.4% | APOGEE THERAPEUTICS INC 1.1% |
| Held alone | 1,845 positions, 90.7% | 26 positions, 18.5% |
| Covered by stock positions | 100% | 67% |
Holdings they share
| Stock | In IWM | In LABU | Counted |
|---|---|---|---|
| CYTKCytokinetics, Inc. | 0.35% | 0.79% | 0.35% |
| KRYSKrystal Biotech, Inc. | 0.30% | 0.75% | 0.30% |
| ALKSAlkermes plc | 0.27% | 0.76% | 0.27% |
| PRAXPraxis Precision Medicines, Inc. | 0.26% | 0.87% | 0.26% |
| TGTXTG Therapeutics, Inc. | 0.25% | 0.76% | 0.25% |
| PCVXVaxcyte, Inc. | 0.24% | 0.81% | 0.24% |
| PTGXProtagonist Therapeutics, Inc. | 0.23% | 0.88% | 0.23% |
| KYMRKymera Therapeutics, Inc. | 0.22% | 0.90% | 0.22% |
| PTCTPTC Therapeutics, Inc. | 0.21% | 0.63% | 0.21% |
| COGTCogent Biosciences, Inc. | 0.20% | 0.85% | 0.20% |
What each holds alone
The heaviest positions one fund reports and the other does not.
Only in IWM
Only in LABU
Questions people ask
Is IWM the same as LABU?
9.1% of their weight sits in the same 121 holdings. IWM also reports MOG.A, HUT, BTSG, which the other does not. LABU also reports RVMD, REGN, NTRA, which the other does not.
How is the overlap between IWM and LABU 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 IWM and 67% of LABU, so the number cannot exceed the smaller coverage.
Which holds more, LABU or IWM?
IWM reports 1,966 stock positions and LABU reports 147. 90.7% of IWM's weight sits in names LABU does not hold, and 18.5% of LABU's weight in names IWM does not hold. The ten largest positions are 3.4% of IWM and 9.4% of LABU.
How do IWM and LABU differ by sector?
The widest gap is Healthcare: LABU has 47.1 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.