SPYM vs VGT: 38% overlap
State Street SPDR Portfolio S&P 500 ETF and Vanguard Information Technology ETF share 37.6% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
You would hold two tickers and get the diversification of 1.6. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SPYM and VGT hold 75 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SPYM | in VGT | Δ |
|---|---|---|---|
| NVDA | 7.9% | 16.1% | 8.2% |
| AAPL | 7.4% | 14.3% | 6.9% |
| MSFT | 4.4% | 8.3% | 3.8% |
| AVGO | 2.9% | 3.8% | 0.9% |
| MU | 1.8% | 5.0% | 3.3% |
| AMD | 1.4% | 3.6% | 2.3% |
| INTC | 0.7% | 2.4% | 1.7% |
| AMAT | 0.7% | 2.3% | 1.6% |
| CSCO | 0.7% | 1.8% | 1.1% |
| LRCX | 0.6% | 2.1% | 1.5% |
Where SPYM and VGT 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 | SPYM | VGT | Δ |
|---|---|---|---|
| Information Technology | 37.5% | 99.5% | −61.9pp |
| Financials | 12.4% | 0.0% | +12.3pp |
| Communication Services | 9.3% | 0.0% | +9.3pp |
| Health Care | 9.1% | 0.0% | +9.1pp |
| Industrials | 8.9% | 0.0% | +8.9pp |
| Consumer Discretionary | 8.7% | 0.0% | +8.7pp |
| Consumer Staples | 4.6% | 0.1% | +4.6pp |
| Energy | 3.4% | 0.0% | +3.4pp |
Δ is SPYM minus VGT, 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
62.4% of SPYM by weight, held in no part of VGT.
12.6% of VGT by weight, held in no part of SPYM.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| SPYM | VGT | |
|---|---|---|
| Top 10 holdings | 36.9% | 59.9% |
| Positions held | 507 | 322 |
| Cost per $10,000 held, per year | $2 | $9 |
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 SPYM and VGT overlap?
SPYM and VGT overlap 37.6% by portfolio weight — moderate overlap. They share 75 holdings. The figure comes from current issuer holdings files (SPYM as of 2026-07-23, VGT as of 2026-06-30).
How is the overlap between SPYM and VGT calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If SPYM holds a stock at 6% and VGT 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 SPYM and VGT?
That depends on your goals — we state facts, not advice. At 37.6% overlap, each fund still contributes meaningfully distinct exposure.
What does SPYM own that VGT doesn't?
SPYM holds 507 positions and VGT holds 322; 431 of SPYM's positions don't appear in VGT at all, and they are 62.4% of SPYM by weight.
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Related comparisons
Sources: issuer holdings files, SPYM as of 2026-07-23, VGT as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.