Data sources
We use primary sources: the fund issuer for SGOV data and the US Treasury for rates. Here is each source, what it supplies and when it was last retrieved.
By the SGOVResource.com editorial team Last reviewed Data refreshed How we calculate Editorial policy
| Source | Supplies | Frequency | Last retrieved |
|---|---|---|---|
| iShares SGOV product page (BlackRock) | NAV, closing price, 52-week range, yields, expense ratio, net assets, shares outstanding, volume, premium/discount, maturity and duration, fund facts, average annual returns, distribution history | Daily (business days) | Oct 24, 2026 |
| iShares SGOV holdings file (CSV) | Individual holdings, weights, maturities, yields | Daily (business days) | Oct 24, 2026 |
| U.S. Treasury Fiscal Data API | Average interest rate on marketable Treasury bills (monthly) | Monthly | Oct 24, 2026 |
| iShares 2025 U.S. Government Source Income Information | Share of SGOV income from US government obligations | Annually (manual) | Oct 24, 2026 |
| Peer fund issuers (Vanguard, State Street, WisdomTree, Fidelity) | Expense ratios and structural facts for comparison pages | Checked manually | Oct 24, 2026 |
Every field, its schedule and its current status
Each field is tracked separately, with its own as-of date. A field is marked stale when it is older than its allowed age; the last valid value stays on the site with its real date.
| Field | Source | Updates | Latest as of | Stale after | Status |
|---|---|---|---|---|---|
| NAV (4:00 pm ET) Net asset value per share, calculated by the issuer at the 4:00 pm ET market close. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| Closing market price Price of the last trade on the listing exchange for the day, as reported by the issuer (end of day, not real time). | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| 1-day NAV change Change in NAV per share versus the previous business day. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| 52-week NAV low Lowest NAV per share over the trailing 52 weeks, as reported by the issuer. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| 52-week NAV high Highest NAV per share over the trailing 52 weeks, as reported by the issuer. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| 30-day SEC yield Standardized SEC formula: net investment income per share over the most recent 30-day period, annualized and divided by the maximum offering price at the end of the period. Net of fund expenses. | iShares SGOV product page (BlackRock) | Each business day | Oct 22, 2026 | 2 business days | ✓ Current |
| 12-month trailing yield Sum of the distributions paid over the past 12 months divided by the latest NAV (plus any capital gains distributed over the same period). | iShares SGOV product page (BlackRock) | Each business day | Oct 22, 2026 | 2 business days | ✓ Current |
| Expense ratio Annual fund operating expenses as a percentage of average net assets, as stated in the prospectus. | iShares SGOV product page (BlackRock) | When the issuer changes it | Oct 23, 2026 | 5 business days | ✓ Current |
| Net assets of fund Total value of the fund’s assets minus liabilities. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| Shares outstanding Number of fund shares in issue. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| 30-day average volume Average daily number of shares traded over the last 30 trading days. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| Premium/discount to NAV Amount the closing market price is above (premium) or below (discount) the NAV, as a percentage of NAV. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| Weighted average maturity Average time until the fund’s holdings mature, weighted by position size. | iShares SGOV product page (BlackRock) | Each business day | Oct 22, 2026 | 2 business days | ✓ Current |
| Effective duration Approximate percentage change in price for a 1 percentage point parallel change in interest rates. | iShares SGOV product page (BlackRock) | Each business day | Oct 22, 2026 | 2 business days | ✓ Current |
| Average yield to maturity Weighted average yield the holdings would earn if held to maturity, before fund expenses. | iShares SGOV product page (BlackRock) | Each business day | Oct 22, 2026 | 2 business days | ✓ Current |
| Distribution history Every distribution with ex-dividend, record and payable dates and income / capital-gain / return-of-capital components. | iShares SGOV product page (BlackRock) | Monthly | Oct 1, 2026 | 45 days | ✓ Current |
| Average annual total returns Issuer-reported NAV, market-price and after-tax returns for 1y, 3y, 5y and since inception, as of the latest month end. | iShares SGOV product page (BlackRock) | Monthly | Sep 30, 2026 | 50 days | ✓ Current |
| Fund facts Fund name, exchange, inception date, benchmark, distribution frequency, CUSIP. | iShares SGOV product page (BlackRock) | When the issuer changes it | Oct 24, 2026 | 5 business days | ✓ Current |
| Holdings Each holding with weight, market value, maturity and yield to maturity. | iShares SGOV holdings file (CSV) | Each business day | Oct 22, 2026 | 3 business days | ✓ Current |
| Average interest rate on Treasury bills Month-end average interest rate on all outstanding marketable Treasury bills (not SGOV’s yield). | U.S. Treasury Fiscal Data — Average Interest Rates on U.S. Treasury Securities | Monthly | Sep 30, 2026 | 70 days | ✓ Current |
| Daily NAV / close history (collected by SGOVResource) One NAV and closing-price observation per business day, appended from the iShares page on each successful run. | iShares SGOV product page (BlackRock) | Each business day | Oct 23, 2026 | 2 business days | ✓ Current |
| US government income share (state tax) Share of a tax year’s Form 1099-DIV Box 1a income derived from US government obligations, per iShares. | iShares annual U.S. Government Source Income document (PDF) | Annually (manual) | Feb 1, 2026 | 425 days | ✓ Current |
| Peer fund expense ratios and structure Expense ratios and structural facts for VBIL, BIL, USFR, SPAXX, BND. | Peer fund issuer pages (Vanguard, State Street, WisdomTree, Fidelity) | Quarterly (manual) | Oct 24, 2026 | 100 days | ✓ Current |
What we do not have
- No real-time quotes. Prices are official end-of-day figures. We do not use an exchange data feed.
- No third-party historical price series. We are building our own daily NAV and close history from the issuer (1 day collected so far) and will chart it once enough has accumulated.
- No peer-fund yields. Comparison pages link to each issuer for current yields instead of showing figures we cannot keep current.
Validation and failures
Each update is checked before publishing: required fields present, values within plausible ranges, valid dates, no duplicate distributions, distribution components summing to the total, holdings weights summing to about 100%, and the issuer’s trailing yield agreeing with the distribution history. A failed update leaves the previous snapshot in place, and pages show a stale-data warning if the snapshot ages. We never label delayed data as live.
Attribution and use
Fund data is © BlackRock, Inc. and is shown for informational purposes with attribution and links to the source. Treasury data is public. SGOVResource.com is independent and not affiliated with BlackRock, iShares or any fund issuer.
Educational information only. SGOVResource.com is independent and not affiliated with BlackRock or iShares. Nothing here is a recommendation to buy or sell any security or individualized tax advice. Estimates depend on the assumptions shown and actual results will differ. Read the fund’s prospectus before investing. Disclaimer.