MGK vs PRGFX: 70% overlap
Vanguard Mega Cap Growth ETF and T. Rowe Price Growth Stock share 70.3% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 3 months apart — PRGFX as of 2026-03-31, the rest through 2026-06-30. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 1.3. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
MGK and PRGFX hold 29 of the same securities. The ten contributing most to the overlap figure:
| Holding | in MGK | in PRGFX | Δ |
|---|---|---|---|
| NVDA | 13.2% | 13.8% | 0.6% |
| AAPL | 12.1% | 11.1% | 1.1% |
| MSFT | 7.5% | 9.1% | 1.6% |
| GOOGL | 5.9% | 7.0% | 1.1% |
| AMZN | 4.4% | 4.9% | 0.5% |
| AVGO | 4.3% | 5.1% | 0.9% |
| META | 4.1% | 3.9% | 0.2% |
| LLY | 3.4% | 3.0% | 0.4% |
| TSLA | 3.9% | 2.7% | 1.2% |
| V | 1.8% | 2.3% | 0.5% |
Where MGK and PRGFX differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | MGK | PRGFX | Δ |
|---|---|---|---|
| Information Technology | 58.6% | 48.2% | +10.4pp |
| Unclassified | 0.0% | 5.9% | −5.9pp |
| Cash & Other | 0.0% | 3.5% | −3.5pp |
| Communication Services | 16.2% | 13.1% | +3.1pp |
| Industrials | 2.6% | 5.6% | −3.0pp |
| Health Care | 4.9% | 6.5% | −1.6pp |
| Financials | 4.0% | 5.1% | −1.1pp |
| Real Estate | 1.2% | 0.5% | +0.7pp |
Δ is MGK minus PRGFX, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
21.5% of MGK by weight, held in no part of PRGFX.
18.2% of PRGFX by weight, held in no part of MGK.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| MGK | PRGFX | |
|---|---|---|
| Top 10 holdings | 63.5% | 62.8% |
| Positions held | 57 | 79 |
| Cost per $10,000 held, per year | $5 | $64 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do MGK and PRGFX overlap?
MGK and PRGFX overlap 70.3% by portfolio weight — substantial duplication if you hold both. They share 29 holdings. The figure comes from current issuer holdings files (MGK as of 2026-06-30, PRGFX as of 2026-03-31).
How is the overlap between MGK and PRGFX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If MGK holds a stock at 6% and PRGFX holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both MGK and PRGFX?
That depends on your goals — we state facts, not advice. At 70.3% overlap, most of what one fund holds, the other holds too. Expense ratios: MGK 0.05% versus PRGFX 0.64%.
What does MGK own that PRGFX doesn't?
MGK holds 57 positions and PRGFX holds 79; 28 of MGK's positions don't appear in PRGFX at all, and they are 21.5% of MGK by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, MGK as of 2026-06-30, PRGFX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.