IWF vs PRGFX: 61% overlap
iShares Russell 1000 Growth ETF and T. Rowe Price Growth Stock share 61.3% 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 4 months apart — PRGFX as of 2026-03-31, the rest through 2026-07-23. 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 1.4. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IWF and PRGFX hold 44 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IWF | in PRGFX | Δ |
|---|---|---|---|
| NVDA | 15.1% | 13.8% | 1.3% |
| AAPL | 7.8% | 11.1% | 3.3% |
| GOOGL | 5.7% | 7.0% | 1.3% |
| AVGO | 5.7% | 5.1% | 0.5% |
| MSFT | 4.4% | 9.1% | 4.7% |
| META | 3.4% | 3.9% | 0.5% |
| LLY | 2.9% | 3.0% | 0.0% |
| TSLA | 2.9% | 2.7% | 0.2% |
| V | 1.8% | 2.3% | 0.5% |
| MA | 1.3% | 1.9% | 0.6% |
Where IWF 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 | IWF | PRGFX | Δ |
|---|---|---|---|
| Information Technology | 55.0% | 48.2% | +6.8pp |
| Unclassified | 0.0% | 5.9% | −5.9pp |
| Cash & Other | 0.0% | 3.5% | −3.5pp |
| Consumer Discretionary | 7.5% | 10.7% | −3.2pp |
| Industrials | 8.5% | 5.6% | +3.0pp |
| Communication Services | 15.7% | 13.1% | +2.6pp |
| Health Care | 5.6% | 6.5% | −0.9pp |
| Energy | 0.5% | 0.0% | +0.5pp |
Δ is IWF 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
33.9% of IWF by weight, held in no part of PRGFX.
11.0% of PRGFX by weight, held in no part of IWF.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IWF | PRGFX | |
|---|---|---|
| Top 10 holdings | 56.1% | 62.8% |
| Positions held | 370 | 79 |
| Cost per $10,000 held, per year | $19 | $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 IWF and PRGFX overlap?
IWF and PRGFX overlap 61.3% by portfolio weight — substantial duplication if you hold both. They share 44 holdings. The figure comes from current issuer holdings files (IWF as of 2026-07-23, PRGFX as of 2026-03-31).
How is the overlap between IWF and PRGFX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IWF 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 IWF and PRGFX?
That depends on your goals — we state facts, not advice. At 61.3% overlap, each fund still contributes meaningfully distinct exposure.
What does IWF own that PRGFX doesn't?
IWF holds 370 positions and PRGFX holds 79; 325 of IWF's positions don't appear in PRGFX at all, and they are 33.9% of IWF by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, IWF as of 2026-07-23, PRGFX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.