SPLG vs VBTLX: 0% overlap
SPDR Portfolio S&P 500 ETF (now SPYM) and Vanguard Total Bond Market Index Admiral share 0.1% 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SPLG and VBTLX hold 1 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SPLG | in VBTLX | Δ |
|---|---|---|---|
| CASH | 0.1% | 1.1% | 1.1% |
Where SPLG and VBTLX 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 | SPLG | VBTLX | Δ |
|---|---|---|---|
| Treasuries | 0.0% | 48.2% | −48.2pp |
| Information Technology | 37.5% | 0.0% | +37.5pp |
| MBS Pass-Through | 0.0% | 20.3% | −20.3pp |
| Corporate — industrial & other | 0.0% | 14.6% | −14.6pp |
| 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 |
Δ is SPLG minus VBTLX, 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
99.9% of SPLG by weight, held in no part of VBTLX.
98.9% of VBTLX by weight, held in no part of SPLG.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| SPLG | VBTLX | |
|---|---|---|
| Top 10 holdings | 36.9% | 71.7% |
| Positions held | 507 | 2,047 |
| Cost per $10,000 held, per year | $2 | $4 |
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 SPLG and VBTLX overlap?
SPLG and VBTLX overlap 0.1% by portfolio weight — largely distinct portfolios. They share 1 holdings. The figure comes from current issuer holdings files (SPLG as of 2026-07-23, VBTLX as of 2026-06-30).
How is the overlap between SPLG and VBTLX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If SPLG holds a stock at 6% and VBTLX 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 SPLG and VBTLX?
That depends on your goals — we state facts, not advice. At 0.1% overlap, each fund still contributes meaningfully distinct exposure.
What does SPLG own that VBTLX doesn't?
SPLG holds 507 positions and VBTLX holds 2,047; 505 of SPLG's positions don't appear in VBTLX at all, and they are 99.9% of SPLG by weight.
You probably hold more than two funds
This page compares SPLG and VBTLX. Paste your whole portfolio — brokerage, 401(k), IRA — and see the overlap across every fund at once, plus what you actually own underneath them and your own Effective Funds number. Free, no account, nothing stored.
X-ray my portfolio — free →Watch SPLG vs VBTLX
We re-read both funds’ published holdings every weeknight. Leave an address and we'll tell you when what's inside actually changes.
Not sending yet — email alerts are built but switched off, and you'll be among the first when they turn on. No spam, one-click unsubscribe.
Related comparisons
Sources: issuer holdings files, SPLG as of 2026-07-23, VBTLX as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.