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ANALYTICS
AnalysisScreenerGroups

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TAMBX

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Benchmark

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Peer Universe

Reference set for percentile ranks and factor bars

Fixed Income Funds · 2,838 total

ANALYTICS
AnalysisScreenerGroups

TAMBX

Municipal Opportunities Fund

Expense Ratio
0.74%
AUM
$1.5B
Inception
1/5/1990
1Y Return
-2.9%25th %ilevs 2,838 asset-class peers
·

The fund invests at least 80% of net assets in tax-exempt bonds of any maturity, including investment grade bonds, while allowing up to 35% in non-investment grade bonds rated BB or lower. The manager favors revenue bonds backed by specific public projects for higher yields and seeks to minimize interest rate effects through call protection. The fund may also engage in derivative transactions and leverage assets via tender option bond transactions, contributing up to 15% of holdings to such strategies.

Time Series
–

Performance

NameCumulative ReturnAnn. ReturnAnn. VolSharpeMax DD
TAMBX
Municipal Opportunities Fund
-2.9%-2.9%3.2%-2.08-6.7%
ⓘ Methodology

ETF performance based on market prices. Drag on chart to select period. Sharpe Ratio uses the one-month T-bill as the risk-free rate. From 10/7/2025 to 10/7/2026.

Trailing Returns

Name
YTD1D5D1M3M6M1Y2Y3Y5YMAX
TAMBX
Municipal Opportunities Fund
-4.2%-0.6%-0.3%-4.1%-6.0%-4.3%-2.9%-0.5%3.6%-0.1%4.2%
ⓘ Methodology

ETF performance based on market prices. Returns for periods greater than one year are annualized. As of 10/7/2026.

Annual Returns

Name
199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025YTD
TAMBX
Municipal Opportunities Fund
6.7%10.6%9.2%10.7%-9.2%20.2%4.2%9.9%5.5%-3.5%10.4%2.6%7.2%4.8%4.9%3.9%5.2%1.8%-5.3%14.4%1.1%10.2%8.5%-5.0%11.3%2.6%-0.4%5.5%0.1%7.9%4.1%3.3%-9.7%6.3%2.5%4.3%-4.2%
ⓘ Methodology

ETF performance based on market prices. As of 10/7/2026.

Correlation Matrix

Benchmark

Select a second series, or to correlate with the seven research factors.

Factor Regression

Name
Ann. αβ MKTβ SMBβ HMLβ RMWβ CMAβ UMDβ iHMLR²Obs
TAMBXUS
Municipal Opportunities Fund
-2.0%0.07**-0.01-0.04*-0.010.05*-0.020.000.18226
ⓘ Methodology

ETF performance based on market prices. US factor set. Daily OLS of excess return (fund − T-bill) on factor spread returns over the selected date range, intersected with each series' history. Bold with * |t| ≥ 1.96, ** |t| ≥ 2.58. Cell shading tracks each loading's t-stat. Betas are returns-based — compare with the holdings-based factor scores below. Factor returns are long-short spread returns (© Ken French, Dartmouth). From 10/7/2025 to 8/31/2026.

SnapshotAs ofvsⓘ

Fund Profile

Fund Documents(opens the fund company’s site in a new tab)
Family
Registrant
Type
Mutual Fund
Asset Class
Fixed Income
Region
Peer Group Benchmark
Prospectus Benchmark
Bloomberg Municipal Bond Index
Peer Group
Fixed Income - Muni Intermediate/Long (569 peers)
1Y Peer Percentile
57
3Y Peer Percentile
77
Expense Ratio
0.74%
5Y Tax Drag
0.03%/yr
AUM
$1.5B
3Y Flow
+66.0%
Yield
3.86%
Inception
1/5/1990
Holdings (Reported)
2,193
Turnover
35%
Equity
0%
Derivatives
0%
Net Equity Exposure
0%
Strategy Summary

The fund invests at least 80% of net assets in tax-exempt bonds of any maturity, including investment grade bonds, while allowing up to 35% in non-investment grade bonds rated BB or lower. The manager favors revenue bonds backed by specific public projects for higher yields and seeks to minimize interest rate effects through call protection. The fund may also engage in derivative transactions and leverage assets via tender option bond transactions, contributing up to 15% of holdings to such strategies.

ⓘ Methodology

Expense ratio and its components from the fund's prospectus fee table; tax drag from its after-tax return table. Turnover from the SEC annual report (7/21/2026). Yield as of 10/6/2026, AUM 9/30/2026. Holdings, asset class, style, peer group and exposures as of 5/31/2026. Strategy summary from the fund's prospectus.

Factor DetailsRef: Fixed Income Funds

None of the selected metrics are scored for TAMBX — switch the picker to All, or add metrics under Metrics (top right).

ⓘ Methodology

Hover or click for factor definitions. Weighted average of underlying company-level values with weights equal to position size. Solid blue dots mark the fund's position within the clean equity fund universe (5th–95th percentile scale); the shaded band spans the fund's broad class (Fixed Income Funds) 25th–75th percentile, notched at the median. Holdings as of 5/31/2026. Stock-level data as of 8/31/2026. Expense ratio, yield, and turnover as of 10/6/2026. AUM as of 9/30/2026.

Country Exposure

Level
100.0%
98.2%
Other1.8%
ⓘ Methodology

Shares are percentages of the holdings that carry a country, not portfolio weights. Based on N-PORT domicile; ADRs list under their exchange. Holdings as of 5/31/2026. Stock-level data as of 8/31/2026.

Holdings

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921 positions (top 10 shown, create for full holdings)

#NameWeight %Country
1JH Collateral
2.09
USA
2Black Belt Energy Gas District
1.11
USA
3Texas Municipal Gas Acquisition And Supply Corpora
0.93
USA
4Tennessee Energy Acquisition
0.71
USA
5New York State Dormitory Authority
0.70
USA
6Public Energy Authority Of Kentucky
0.68
USA
7Massachusetts Development Finance Agency
0.67
USA
8Metropolitan Washington Airpor Metapt 10/30 Fixed 5
0.65
USA
9Public Energy Authority Of Kentucky
0.65
USA
10Black Belt Energy Gas District
0.64
USA
ⓘ Methodology

Sector, country and factor detail need a security match; the share of weight that matched is a member figure, so the rows without one appear here with those columns blank. Holdings as of 5/31/2026. Stock-level data as of 8/31/2026.

ConcentrationRef: Fixed Income Funds

Total Holdings2,193
Effective Holdings372.3
Top 10 Weight8.8%
Max Position2.1%
Top Sector (of Net Assets)100%
Top Country (of Net Assets)99%
ⓘ Methodology

Hover or click for definitions. Solid blue dots mark the fund: percentage rows on a 0–100% scale, holdings counts log-scaled across the clean-universe 5th–95th percentile range. The shaded band spans the fund's broad class (Fixed Income Funds) 25th–75th percentile, notched at the median. Holdings as of 5/31/2026.

Benchmark DifferentiationRef: Fixed Income Funds

vs AGGBroad Benchmark
Tracking Error4.4%
Benchmark Correlation0.50
ⓘ Methodology

One sub-card per benchmark: the market primary, then the style secondary — the gap between them is the style sleeve itself. Both anchors are Sparkline-inferred (market from asset class and region, style from the holdings size-and-style map), not the fund's official prospectus benchmark. Solid blue dot marks the fund; the shaded band spans the reference set's 25th–75th percentile, notched at the median (band follows the Peer Universe selector). Active Share compares the fund's book with the benchmark's, share for share; Tracking Error is the annualized daily deviation over the trailing two years (ruler runs to just past the universe's 95th percentile, or past the fund's own figure where that is larger); Benchmark Correlation is the plain daily correlation over the trailing year. Hover the labels for full definitions.

Peer Group Rank

See All Peer Groups
Metric
TAMBX
Municipal Opportunities Fund
Peer Group
569 funds
Peer Asset Class
2,838 funds
YTD Return
-4.20%-4.42%59-2.33%22
1Y Return
-2.91%-3.14%57-1.51%25
3Y Return (Ann.)
3.56%3.02%774.80%25
5Y Return (Ann.)
-0.14%-0.57%710.27%42
Expense Ratiohigher = cheaper
0.74%0.56%310.52%31
ⓘ Methodology

Sparkline's own holdings-based peer taxonomy (1,325 share classes across 569 funds). One share class shown per fund — the exchange-listed class where the SEC series has one, else its longest-history class; percentile ranks and medians are computed against the same deduped set. Quartile chips fill the layer the fund's rank falls in (top layer = best quartile). Funds without a full return history rank only on the horizons they cover.

Similar Funds

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Nearest funds across the whole universe, by holdings and behavior — the peer taxonomy is ignored, so matches can come from any category.

Top Similarity59
Top Overlap
Top Active Tilt
Top Return Corr
FundPeer Group
1JHMU
John Hancock Dynamic Municipal Bond ETF
Fixed Income - Muni Intermediate/Long
Fixed Income - Muni Intermediate/Long
59---
2MISHX
AB Municipal Income Shares
Fixed Income - Muni Intermediate/Long
Fixed Income - Muni Intermediate/Long
42---
3JHSFX
Short Duration Municipal Opportunities Fund
Fixed Income - Muni Short
Fixed Income - Muni Short
42---
4ATCCX
AB Tax-Aware Fixed Income Opportunities Portfolio
Fixed Income - Unconstrained
Fixed Income - Unconstrained
37---
5JHTFX
High Yield Municipal Bond Fund
Fixed Income - Muni High Yield
Fixed Income - Muni High Yield
37---
6SDHAX
Lord Abbett Short Duration High Income Municipal Bond Fund
Fixed Income - Muni High Yield
Fixed Income - Muni High Yield
37---
7VWAHX
VANGUARD HIGH-YIELD TAX-EXEMPT FUND
Fixed Income - Muni High Yield
Fixed Income - Muni High Yield
36---
8PRSMX
T. Rowe Price Intermediate Municipal Bond Fund
Fixed Income - Muni Intermediate/Long
Fixed Income - Muni Intermediate/Long
35---
9VWITX
VANGUARD INTERMEDIATE-TERM TAX-EXEMPT FUND
Fixed Income - Muni Intermediate/Long
Fixed Income - Muni Intermediate/Long
35---
10AMHIX
American High-Income Municipal Bond Fund
Fixed Income - Muni High Yield
Fixed Income - Muni High Yield
35---

The method columns are members-only — create a free account to see these figures.

ⓘ Methodology

Rows are the consensus top matches (a fund must place in at least two methods' top 250 to qualify, and matches missing more than one of this fund's own methods are not ranked — a row scored on fewer methods is a noisier estimate, not a better match). Click a method column to see that method's own top matches across the whole universe instead. Gray (N) beside each method's metric is that fund's rank in the whole universe on that method. Similarity is a percentile among match-grade fund pairs, 0–100 — 87 means the pair is closer than 87% of the strongest matches in the universe, averaged across the methods — so it compares across funds: index clones tie at the top with thousands of other clone pairs, so scores top out in the high 80s to 90s, while a one-of-a-kind fund's best match can score in the 30s. Rows are ordered by the Consensus Rank — the geometric mean of those universe ranks, shown in each cell's tooltip — and the score is held down the list to the level of the closest match above it, so equal scores mean equally close and the number reads as a floor. A dash means that method has no figure for the pair at all (one of them lacks the holdings or return history it needs). Hover a column header for each method's definition. The “Top…” strips above compare against every fund's own top match across the whole universe (they deliberately don't follow the Peer Universe selector); Top Similarity is simply the best match's score, with no reference band; the Holdings and Active Tilt strips carry no reference band because computing every fund's best book overlap would require a full holdings scan per fund — the dot stands alone on its natural 0–100% scale. One share class shown per fund, and a fund's own sister share classes are excluded from its Top-match strips. Holdings as of 5/31/2026. Consensus Rank is the geometric mean of the match's universe-wide rank across the methods (#1.0 = top match on every one). Holdings Overlap = common-holdings weight (sum of the minimum weight across shared positions, long only). Active Tilt Overlap = the same statistic on active weights (holdings minus the fund's own default benchmark, floored at 0), which strips the benchmark ballast that dominates raw overlap. Return Correlation = correlation of market-hedged daily returns over the trailing two years (CAPM residuals), so only market-beta co-movement is removed; requires ~18 months of daily history (378 of the window's 504 trading days).