TSPF vs VFFVX: 9% overlap
TSP F Fund — shown via aggregate-bond proxy and Vanguard Target Retirement 2055 share 8.7% 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 — VFFVX 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
TSPF and VFFVX hold 1,684 of the same securities. The ten contributing most to the overlap figure:
| Holding | in TSPF | in VFFVX | Δ |
|---|---|---|---|
| CASH | 2.7% | 1.9% | 0.8% |
| UST-3-10Y | 21.0% | 1.4% | 19.6% |
| AGENCY-MBS | 24.1% | 1.4% | 22.7% |
| UST-0-3Y | 16.1% | 1.1% | 15.0% |
| UST-10Y+ | 9.3% | 0.7% | 8.7% |
| 46647P | 0.5% | 0.0% | 0.5% |
| 06051G | 0.5% | 0.0% | 0.5% |
| 459058 | 0.3% | 0.0% | 0.3% |
| 68389X | 0.3% | 0.0% | 0.3% |
| 023135 | 0.3% | 0.0% | 0.3% |
Where TSPF and VFFVX 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 | TSPF | VFFVX | Δ |
|---|---|---|---|
| Treasuries | 46.5% | 3.3% | +43.2pp |
| Information Technology | 0.0% | 26.3% | −26.3pp |
| MBS Pass-Through | 24.1% | 1.4% | +22.7pp |
| Corporate — industrial & other | 14.3% | 1.1% | +13.2pp |
| Industrials | 0.0% | 10.6% | −10.6pp |
| Consumer Discretionary | 0.0% | 7.6% | −7.6pp |
| Health Care | 0.0% | 7.0% | −7.0pp |
| Financials | 8.0% | 14.1% | −6.1pp |
Δ is TSPF minus VFFVX, 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
0.4% of TSPF by weight, held in no part of VFFVX.
91.2% of VFFVX by weight, held in no part of TSPF.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| TSPF | VFFVX | |
|---|---|---|
| Top 10 holdings | 75.3% | 19.2% |
| Positions held | 1,864 | 6 |
| Cost per $10,000 held, per year | $5 | $8 |
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 TSPF and VFFVX overlap?
TSPF and VFFVX overlap 8.7% by portfolio weight — largely distinct portfolios. They share 1,684 holdings. The figure comes from current issuer holdings files (TSPF as of 2026-07-23, VFFVX as of 2026-03-31).
How is the overlap between TSPF and VFFVX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If TSPF holds a stock at 6% and VFFVX 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 TSPF and VFFVX?
That depends on your goals — we state facts, not advice. At 8.7% overlap, each fund still contributes meaningfully distinct exposure.
What does TSPF own that VFFVX doesn't?
TSPF holds 1,864 positions and VFFVX holds 6; 179 of TSPF's positions don't appear in VFFVX at all, and they are 0.4% of TSPF by weight.
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Related comparisons
Sources: issuer holdings files, TSPF as of 2026-07-23, VFFVX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.