# SOFX Tracking Error: Up vs Down Days

> Over the 90 days to Nov 4, 2026, SOFX missed two times SOFI's daily return by 20.4 basis points a day on average, on its closing price.

Data as of Nov 4, 2026. Rebuilt every trading night.

As of Nov 4, 2026 . Rebuilt every trading night.

## SOFX daily tracking

Over the 90 days to Nov 4, 2026, SOFX missed two times SOFI's daily return by 20.4 basis points a day on average, on its closing price.

| Window | Read on | Average daily miss, bp | Signed average, bp | Tracking error | Up days, bp | Down days, bp | Up less down, bp | Confidence |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 30 days to Nov 4, 2026: 20 of 22 days, from Oct 7, 2026 | NAV (stated) | 11.5 | −9.7 | 1.48% | −8.0 (9 days) | −11.1 (11 days) | +3.0 | Not enough days |
| 30 days to Nov 4, 2026, 22 daily returns | closing price | 19.6 | −9.3 | 3.79% | −16.2 (10 days) | −3.5 (12 days) | −12.7 | Not significant (t −1.3) |
| 90 days to Nov 4, 2026, 63 daily returns | closing price (stated) | 20.4 | −9.3 | 3.79% | −8.5 (27 days) | −9.9 (36 days) | +1.4 | Not significant (t 0.2) |
| 180 days to Nov 4, 2026, 124 daily returns | closing price (stated) | 19.9 | −9.7 | 3.60% | −11.9 (56 days) | −7.9 (68 days) | −4.1 | Not significant (t −1.0) |
| 1 year to Nov 4, 2026, 251 daily returns | closing price (stated) | 18.7 | −9.1 | 3.48% | −12.2 (112 days) | −6.7 (139 days) | −5.5 | Not significant (t −2.0) |

### SOFX's largest daily misses

The 5 days SOFX strayed furthest from its daily target in the 1 year to Nov 4, 2026, each on its NAV where ETFIQ holds it, else its closing price.

| # | Day | Read on | SOFI moved | Target | SOFX returned | Miss |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Mar 23, 2026 | closing price | +1.48% | +2.96% | +2.21% | −0.75 pts |
| 2 | Dec 11, 2025 | closing price | −0.07% | −0.15% | −0.77% | −0.62 pts |
| 3 | Sep 30, 2026 | closing price | −1.19% | −2.39% | −2.95% | −0.56 pts |
| 4 | Jun 15, 2026 | closing price | +3.32% | +6.63% | +6.10% | −0.54 pts |
| 5 | Jun 29, 2026 | closing price | +1.73% | +3.47% | +2.92% | −0.54 pts |

### Method

The daily miss is SOFX's return each day less two times SOFI's return that day. A basis point is a hundredth of a percentage point. Each window is read twice where ETFIQ holds both NAVs: on NAVs, and on closing prices. It is stated on the closing price because NAVs for 20 of the 63 sessions. SOFX ranks 177 of 494 2x leveraged ETFs on its 90-day average daily miss. Up days and down days split the miss by whether SOFI rose or fell; Significant means the gap is at least two standard errors from zero. The average miss carries its sign: a negative one is what the fund kept below its target each day, its fees and financing among it. Not every fund here has traded for a year, and a number over eight months does not order against one over twelve. This page lists each fund with its window and dates instead of ranking them. It becomes a ranking on the night four of them share a full year. Every window ETFIQ can measure for SOFX is listed.

### Where to next

### Sources

Links are sources, not endorsements.

A ranking is not a recommendation or an opinion. ETFIQ is an independent publisher, not an adviser. Standards and sources

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Source: ETFIQ, independent ETF data. Recomputed nightly from public filings and prices.
Cite: ETFIQ, SOFX daily tracking, listed by window, data as of Nov 4, 2026. https://etfiq.com/funds/sofx/tracking/
Licence: https://etfiq.com/license/ Data ETFIQ computes is free to use with attribution: ETFIQ (etfiq.com). Issuer data stays under its owner's terms.
HTML: https://etfiq.com/funds/sofx/tracking/