Fund · T. Rowe Price Ultra Short-Term Bond ETF · measured from SEC filings
TBUX holdings
TBUX reports 625 holdings and behaves like 283.9 equally weighted ones, computed from its SEC Form N-PORT filing for 2026-05-31. The fact sheet publishes the first number; this page computes the second, and traces it across 19 quarters of filings.
Measured concentration
as of 2026-05-31Computed by this site from the fund's SEC Form N-PORT filing; what the measure does not tell you · every fund in one table · hold it with other funds? X-ray the mix. Pricing: 0.13% at a quoted market price (level 1), 27 issuer countries, 0.28% restricted securities.
What stands out
as of 2026-05-31TBUX's largest investment is US Treasury N/B 02/28 3.375 at 1.65% of net assets. Fnma Pool Ma4919 FN 02/53 Fixed 5.5 and Brunswick Corp Disc follow; the three together are 4.26%. Ten companies are 9.27% of the fund; the other 615 share the rest. Among the 192 bond funds measured here, TBUX behaves like 283.9 holdings against a median of 236.4 — close to the median. Across 19 quarterly filings TBUX has become less concentrated: it behaved like 84.3 at 2021-11-30 and 283.9 at 2026-05-31. Between the 2026-02-28 and 2026-05-31 filings 178 positions were added and 186 dropped; 49.7% of the weight moved. the United States is the largest country at 73.01% of the portfolio, across 27 countries in the filing.
Each sentence is read from the fund's own SEC filing; the class median is computed across the comparable bond funds on this site. Nothing here is a view on the fund.
Every filing since 2021
19Between 2021-11-30 and 2026-05-31, TBUX went from behaving like 84.3 equally weighted positions to 283.9 — 237% more, while its top ten went from 17.82% to 9.27% of net assets. Read across the funds on the concentration-over-time table.
| Period | Holdings | Effective | Top 10 | Largest |
|---|---|---|---|---|
| 2026-05-31 | 625 | 283.9 | 9.27% | 1.64% |
| 2026-02-28 | 635 | 273.5 | 9.63% | 1.24% |
| 2025-11-30 | 597 | 286.8 | 9.05% | 1.48% |
| 2025-08-31 | 596 | 286.8 | 9.32% | 1.26% |
| 2025-05-31 | 564 | 289.8 | 8.55% | 1.4% |
| 2025-02-28 | 537 | 287.2 | 8.54% | 0.96% |
| 2024-11-30 | 507 | 283.3 | 9.03% | 1.23% |
| 2024-08-31 | 460 | 279.9 | 8.34% | 0.99% |
Earlier filings (11 more, back to 2021-11-30)
| Period | Holdings | Effective | Top 10 | Largest |
|---|---|---|---|---|
| 2024-05-31 | 441 | 277.7 | 7.82% | 0.91% |
| 2024-02-29 | 381 | 235.4 | 9.1% | 1.21% |
| 2023-11-30 | 367 | 231.8 | 8.93% | 1.04% |
| 2023-08-31 | 367 | 218.4 | 9.82% | 1.25% |
| 2023-05-31 | 320 | 212.6 | 9.57% | 1.84% |
| 2023-02-28 | 324 | 220.4 | 9.55% | 1.85% |
| 2022-11-30 | 311 | 212.4 | 10.35% | 1.58% |
| 2022-08-31 | 313 | 197.5 | 11.56% | 2.52% |
| 2022-05-31 | 251 | 154.1 | 11.99% | 3.98% |
| 2022-02-28 | 202 | 142.3 | 12.84% | 3.42% |
| 2021-11-30 | 160 | 84.3 | 17.82% | 7.31% |
One row per filed reporting period, newest first, read from EDGAR. Quarterly because that is the public filing cadence. Rows marked * are published but held out of the comparison above; the methodology page says when and why.
Largest positions, as filed
as of 2026-05-31The 15 largest of 625 positions in TBUX's Form N-PORT, weight as a share of net assets, securities-lending collateral excluded. Every position, every quarter: TBUX.csv.gz.
| # | Position | Weight | Cumulative |
|---|---|---|---|
| 1 | US TREASURY N/B | 1.64% | 1.6% |
| 2 | FNMA 30 YR | 1.60% | 3.2% |
| 3 | BRUNSWICK CORP 4/2 144A CP | 0.99% | 4.2% |
| 4 | INTL FLAVORS & FRAGRANCE 4/2 144A CP | 0.92% | 5.2% |
| 5 | JPMCC 2016-NINE A 144A | 0.77% | 5.9% |
| 6 | PHILLIPS 66 4/2 144A CP | 0.70% | 6.6% |
| 7 | HOMES 2026-NQM3 A1 144A | 0.68% | 7.3% |
| 8 | BATLN 2021-19A AR 144A | 0.67% | 8.0% |
| 9 | US TREASURY N/B | 0.65% | 8.6% |
| 10 | BAYER US FINANCE II LLC 144A | 0.65% | 9.3% |
| 11 | BCC 2020-5A ARR 144A | 0.61% | 9.9% |
| 12 | HONEYWELL AEROSPACE INC 144A | 0.61% | 10.5% |
| 13 | SONIC 2020-1A A2I 144A | 0.60% | 11.1% |
| 14 | MORGN 2019-5A AR2 144A | 0.56% | 11.6% |
| 15 | AMERICAN HOMES 4 RENT | 0.55% | 12.2% |
By country of issuer
as of 2026-05-31Share of TBUX's own investments by the issuer country the filer reported (incorporation, not revenue). Each country links to every fund that holds it.
| Country | Share |
|---|---|
| United States | 72.97% |
| Cayman Islands° | 7.58% |
| United Kingdom | 4.24% |
| Canada | 2.16% |
| Netherlands° | 2.15% |
| France | 2.03% |
| Bermuda° | 1.14% |
| South Korea | 1.04% |
Returns the fund reported
2021-09 – 2026-05Monthly total returns from Item B.5 of TBUX's own filings, 57 months on record. Not computed here and not from a price feed.
Cross-checked against a series computed separately from prices: median difference 0.04 percentage points over 56 months, which is roughly the distributions. Every month with the filing it came from: TBUX.json · all funds.
Who borrows TBUX's shares
2026-05-31The fund lends its holdings, and Item B.4.a of the filing names every firm holding them. At 2026-05-31, $1m was out to 3 borrowers, 0.12% of net assets. The largest, NATWEST MARKETS SECURITIES INC, held 46.9% of it.
| Borrower | On loan | Share of the loan |
|---|---|---|
| NATWEST MARKETS SECURITIES INC | $641,163 | 46.9% |
| BARCLAYS BANK PLC | $594,001 | 43.4% |
| CITIGROUP GLOBAL MARKETS INC. | $132,183 | 9.7% |
Cash collateral reported against the loan: 0.12% of net assets, 100.3% of the amount lent. That is a floor on the collateral, not the whole of it — collateral the fund does not hold as a position is not in this filing, so a figure under 100% is not evidence of under-collateralisation. How that figure behaves across all funds. Every quarter TBUX has filed, with each borrower: TBUX.json · all funds.
Since the previous filing
2026-02-28 → 2026-05-31631 positions became 623: 178 added (45.4% of the fund at the later date), 186 dropped (39.1% at the earlier date). Half the sum of all weight changes, a turnover proxy: 49.7%. Positions are matched on identifiers, so a security whose identifier changed shows as one drop and one add. Every filing of TBUX compared this way, as a feed: changes.xml · all funds: filings received.
| Largest increases | 2026-02-28 | 2026-05-31 | Largest decreases | 2026-02-28 | 2026-05-31 |
|---|---|---|---|---|---|
| DANSKE BANK A/S 144A | 0.10% | 0.52% | CNH INDUSTRIAL CAP LLC | 0.41% | 0.17% |
| BOOZ ALLEN HAMILTON INC 144A | 0.10% | 0.48% | STANDARD CHARTERED PLC 144A | 0.38% | 0.24% |
| JPMCC 2016-NINE B 144A | 0.08% | 0.40% | MEDLINE BORROWER LP 144A | 0.32% | 0.18% |
| CVS HEALTH CORP | 0.04% | 0.34% | BATLN 2016-10A A1R3 144A | 0.61% | 0.47% |
| BNP PARIBAS 144A | 0.10% | 0.39% | FNMA 30 YR | 0.65% | 0.52% |
| EQUITABLE AMERICA GLOBAL 144A | 0.06% | 0.34% | JPMCC 2016-NINE A 144A | 0.90% | 0.77% |
New: US TREASURY N/B (1.64%), FNMA 30 YR (1.60%), BRUNSWICK CORP 4/2 144A CP (0.99%), INTL FLAVORS & FRAGRANCE 4/2 144A CP (0.92%), PHILLIPS 66 4/2 144A CP (0.70%), HOMES 2026-NQM3 A1 144A (0.68%). Gone: ENERGY TRANSFER PARTNERS 4/2 144A CP (1.24%), U S TREASURY BILL (1.11%), OVINTIV INC 4/2 CP (1.08%), BRUNSWICK CORP 4/2 144A CP (0.96%), GLOBAL PAYMENTS INC 4/2 CP (0.96%), STANLEY BLACK & DECKER 4/2 144A CP (0.94%).
Asset categories and pricing
as of 2026-05-31| Asset category (as filed) | Share of investments |
|---|---|
| debt DBT | 65.74% |
| ABS-O ABS-O | 15.62% |
| mortgage-backed ABS-MBS | 12.08% |
| CDO/CLO ABS-CBDO | 6.43% |
| short-term investment STIV | 0.12% |
0.1% of TBUX is carried at a quoted market price (fair-value level 1). Categories and levels are the filer's, from Form N-PORT; what a low level-1 share does and does not mean is in the measure's page.
Derivative exposure and counterparties
as of 2026-05-31A position count cannot describe a fund that uses derivatives, because a swap is filed at its unrealised gain, not its exposure. These are the notionals the fund itself reported, against net assets of $1.14B. Notional of an interest-rate or currency swap is not equity exposure.
5 option positions filed, 2 of them written. The book as filed:
| Type | Side | Strike | Expiry | Underlying |
|---|---|---|---|---|
| Put | Purchased | 65 | 2026-07-15 | as filed, not named |
| Put | Written | 75 | 2026-07-15 | as filed, not named |
| Put | Purchased | 55 | 2026-06-17 | as filed, not named |
| Put | Written | 62.5 | 2026-06-17 | as filed, not named |
| Call | Purchased | 104.625 | 2026-07-24 | as filed, not named |
Full detail for every fund that files derivatives: leverage.json (CC BY 4.0).
Neighbours by effective holdings, debt funds
10Every measured debt fund lined up by how many holdings it behaves like; these sit either side of TBUX (283.9). Same filings, same arithmetic. Position in this list says nothing about which fund is better.
| Fund | Reports | Behaves like | Top ten | As of |
|---|---|---|---|---|
| HMOP Hartford Municipal Opportunities ETF | 624 | 271.2 | 10.03% | 2026-07-31 |
| JPST JPMorgan Ultra-Short Income ETF | 805 | 271.6 | 10.65% | 2026-05-31 |
| MUNI PIMCO Intermediate Municipal Bond Active Exchange-Traded Fund | 648 | 280.1 | 10.8% | 2026-06-30 |
| XEMD BondBloxx JP Morgan USD Emerging Markets 1-10 Year Bond ETF | 425 | 282.3 | 9.56% | 2026-07-31 |
| IBDZ iShares iBonds Dec 2034 Term Corporate ETF | 375 | 283.2 | 8.35% | 2026-07-31 |
| DFGP Dimensional Global Core Plus Fixed Income ETF | 1,540 | 284.7 | 11.54% | 2026-07-31 |
| BBAG JPMorgan BetaBuilders U.S. Aggregate Bond ETF | 1,810 | 286.5 | 11.44% | 2026-05-31 |
| EAGG iShares ESG Aware U.S. Aggregate Bond ETF | 5,212 | 288.9 | 8.45% | 2026-05-31 |
| IGEB iShares Investment Grade Systematic Bond ETF | 466 | 289.4 | 5.51% | 2026-05-31 |
| FLUD Franklin Ultra Short Bond ETF | 519 | 307.6 | 8.86% | 2026-06-30 |
Essays that examine TBUX
0Mentions are detected across the full text of every article, so an appearance may be a passing comparison rather than the subject. Nothing here is a recommendation to buy or sell — see the disclaimer.