Tax-Loss Harvest Finder
Sell the loss, keep the exposure. For any fund, ranked stand-ins that track the same market — scored on a year of price correlation, holdings overlap, and fee — with a flag when two funds follow the same index and a swap could look substantially identical.
Correlation computed on ~250 shared sessions per pair · not tax advice — the flag is a heuristic, your compliance desk has the final word
| Substitute | Correlation | Book overlap | Fee vs XMMO | Assets | Wash-sale read | |
|---|---|---|---|---|---|---|
| MDYG SPDR S&P 400 Mid Cap Growth ETF | 0.910 | 28% | -19bp | $2.8B | different index | Compare |
| VFMO Vanguard U.S. Momentum Factor ETF | 0.892 | 8% | -21bp | $646M | different index | Compare |
| SPMD State Street SPDR Portfolio S&P 400 Mid Cap ETF | 0.836 | 23% | -31bp | $18.4B | different index | Compare |
| VBK Vanguard Small Cap Growth Index Fund | 0.855 | 14% | -27bp | $17.7B | different index | Compare |
| SEIM SEI Enhanced U.S. Large Cap Momentum Factor ETF | 0.880 | — | -34bp | $500M | different index | Compare |
| MTUM iShares MSCI USA Momentum Factor ETF | 0.863 | 1% | -19bp | $18.1B | different index | Compare |
RANKED BY CORRELATION, FEE, AND OVERLAP · “SAME INDEX” PAIRS ARE FLAGGED BECAUSE THE IRS HAS NEVER DEFINED “SUBSTANTIALLY IDENTICAL” — MOST DESKS TREAT SAME-INDEX SWAPS AS OFF-LIMITS AND DIFFERENT-INDEX SWAPS AS DEFENSIBLE
Cached coverage for 2,093 funds. Latest price/flow record dates: 2024-08-23 to 2026-10-23 (1,065 funds with dated records). Fund details retrieved: 2026-09-25 to 2026-10-27. Data dates vary by fund; these are not live quotes. Flow totals include available records only; missing coverage is not evidence of zero flow.