IWY vs MGK: Holdings Overlap
IWYiShares Russell Top 200 Growth ETF
iShares · 110 holdings · $16.6B · as of 2026-03-31
MGKVanguard Mega Cap Growth Index Fund
Vanguard · 59 holdings · $33.7B · as of 2026-03-31
How similar are IWY and MGK?
iShares Russell Top 200 Growth ETF (IWY, by iShares) holds 110 positions; Vanguard Mega Cap Growth Index Fund (MGK, by Vanguard) holds 59. They have 52 holdings in common, and by portfolio weight the two funds are 82.7% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 82.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 52IWY holds 110 · MGK holds 59
- Weight in Shared Holdings
- IWY 85%·MGK 96%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 IWY
58 of 110 positions (14.5% of the fund) are not held by MGK. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWY | MGK |
|---|---|---|
| Information Technology | 53.1% | 54.4% |
| Communication Services | 13.0% | 16.7% |
| Consumer Discretionary | 11.3% | 13.1% |
| Health Care | 7.5% | 5.2% |
| Financials | 5.9% | 4.9% |
| Other Sectors | 9.0% | 5.6% |
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.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWY | +2.5% | +5.3% | +13.9% | +22.5% | +13.7% | +18.8% | 0.34% |
| MGK | +3.8% | +10.2% | +19.4% | +24.7% | +14.0% | +18.8% | 0.32% |
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 IWY vs MGK →
Shared Holdings(52)
The top 10 shared positions account for 74% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 14.62% | 13.75% | 13.75% |
|---|---|---|---|
 AAPLApple Inc. COM | 13.13% | 12.60% | 12.60% |
 MSFTMicrosoft Corp. COM | 9.91% | 9.01% | 9.01% |
 AMZNAmazon.com, Inc. COM | 4.46% | 4.59% | 4.46% |
 AVGOBroadcom Inc COM | 4.31% | 4.40% | 4.31% |
 GOOGLAlphabet Inc. CAP STK CL A | 3.93% | 5.51% | 3.93% |
 TSLATesla Inc COM | 3.52% | 4.18% | 3.52% |
 METAMeta Platforms, Inc., Class A | 3.42% | 4.17% | 3.42% |
 GOOGAlphabet Inc. CAP STK CL C | 3.20% | 4.37% | 3.20% |
 LLYEli Lilly & Co. COM | 2.88% | 3.17% | 2.88% |
 VVisa, Inc., Class A | 2.16% | 1.97% | 1.97% |
 NFLXNetflix, Inc. COM | 1.73% | 1.76% | 1.73% |
 MAMasterCard Incorporated CL A | 1.71% | 1.72% | 1.71% |
 PLTRPalantir Technologies, Inc., Class A | 1.36% | 1.42% | 1.36% |
 LRCXLam Research Corporation COM NEW | 1.14% | 1.25% | 1.14% |
 ORCLOracle Corp. COM | 1.05% | 1.18% | 1.05% |
 GEVGE Vernova Inc. COM | 1.00% | 1.14% | 1.00% |
 KLACKLA Corp. COM NEW | 0.82% | 0.98% | 0.82% |
 AMDAdvanced Micro Devices Inc. COM | 0.81% | 1.49% | 0.81% |
 ISRGIntuitive Surgical Inc. COM NEW | 0.69% | 0.83% | 0.69% |
 APHAmphenol Corporation CL A | 0.66% | 0.80% | 0.66% |
 UBERUber Technologies Inc COM | 0.62% | 0.78% | 0.62% |
 BKNGBooking Holdings Inc COM | 0.55% | 0.71% | 0.55% |
 PANWPalo Alto Networks Inc COM | 0.55% | 0.71% | 0.55% |
 ANETArista Networks Inc COM SHS | 0.54% | 0.70% | 0.54% |
Frequently Asked Questions
How much do IWY and MGK overlap?
IWY and MGK overlap by 82.7% of portfolio weight. They share 52 holdings (IWY holds 110 positions and MGK holds 59), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWY and MGK?
The two portfolios are 82.7% identical by weight. Owning both mostly doubles down on the shared core rather than diversifying: the same large positions drive both funds.
What are the biggest shared holdings of IWY and MGK?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and AVGO. Together the top 10 shared positions account for 74% of the total overlap.
What does IWY own that MGK doesn't?
58 positions (14.5% of IWY) are unique to IWY, led by COST, ABBV and GE. In the other direction, 7 positions (3.6% of MGK) are unique to MGK.