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Shareholder Report
6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name NEUBERGER BERMAN ADVISERS MANAGEMENT TRUST
Entity Central Index Key 0000736913
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
C000022323  
Shareholder Report [Line Items]  
Fund Name Mid Cap Growth Portfolio
Class Name Class I
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class I
$46
0.88%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.88%
AssetsNet $ 579,849,027
Holdings Count | Holding 82
InvestmentCompanyPortfolioTurnover 132.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$579,849,027
Number of Portfolio Holdings
82
Portfolio Turnover Rate
132%
Holdings [Text Block]

Sector Allocation

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Information Technology
32.3%
Industrials
23.0%
Health Care
13.3%
Consumer Discretionary
11.3%
Energy
4.6%
Financials
4.6%
Communication Services
3.6%
Consumer Staples
2.7%
Short-Term Investments
4.6%
Total
100.0%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
Largest Holdings [Text Block]

Top Ten Securities

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
State Street Institutional U.S. Government Money Market Fund Premier Class
4.3%
Monolithic Power Systems, Inc.
3.2%
Teradyne, Inc.
3.1%
Comfort Systems USA, Inc.
2.9%
Targa Resources Corp.
2.7%
Cloudflare, Inc. Class A
2.5%
Datadog, Inc. Class A
2.5%
Lumentum Holdings, Inc.
2.3%
Rocket Lab Corp.
1.9%
Microchip Technology, Inc.
1.8%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000022324  
Shareholder Report [Line Items]  
Fund Name Mid Cap Growth Portfolio
Class Name Class S
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class S
$58
1.10%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.10%
AssetsNet $ 579,849,027
Holdings Count | Holding 82
InvestmentCompanyPortfolioTurnover 132.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$579,849,027
Number of Portfolio Holdings
82
Portfolio Turnover Rate
132%
Holdings [Text Block]

Sector Allocation

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Information Technology
32.3%
Industrials
23.0%
Health Care
13.3%
Consumer Discretionary
11.3%
Energy
4.6%
Financials
4.6%
Communication Services
3.6%
Consumer Staples
2.7%
Short-Term Investments
4.6%
Total
100.0%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
Largest Holdings [Text Block]

Top Ten Securities

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
State Street Institutional U.S. Government Money Market Fund Premier Class
4.3%
Monolithic Power Systems, Inc.
3.2%
Teradyne, Inc.
3.1%
Comfort Systems USA, Inc.
2.9%
Targa Resources Corp.
2.7%
Cloudflare, Inc. Class A
2.5%
Datadog, Inc. Class A
2.5%
Lumentum Holdings, Inc.
2.3%
Rocket Lab Corp.
1.9%
Microchip Technology, Inc.
1.8%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000022326  
Shareholder Report [Line Items]  
Fund Name Mid Cap Intrinsic Value Portfolio
Class Name Class I
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class I
$46
0.85%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.85%
AssetsNet $ 112,806,500
Holdings Count | Holding 66
InvestmentCompanyPortfolioTurnover 33.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$112,806,500
Number of Portfolio Holdings
66
Portfolio Turnover Rate
33%
Holdings [Text Block]

Sector Allocation

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Information Technology
28.6%
Industrials
18.3%
Consumer Discretionary
9.8%
Financials
9.0%
Utilities
8.0%
Health Care
7.7%
Energy
4.7%
Real Estate
4.2%
Communication Services
3.5%
Consumer Staples
2.9%
Materials
1.0%
Short-Term Investments
2.3%
Total
100.0%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
Largest Holdings [Text Block]

Top Ten Securities

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Intel Corp.
3.5%
Ryan Specialty Holdings, Inc.
2.6%
Arcosa, Inc.
2.5%
Huntington Bancshares, Inc.
2.4%
IPG Photonics Corp.
2.4%
Coherent Corp.
2.4%
Teledyne Technologies, Inc.
2.3%
Williams Cos., Inc.
2.3%
Lionsgate Studios Corp.
2.3%
State Street Institutional U.S. Government Money Market Fund Premier Class
2.3%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000022327  
Shareholder Report [Line Items]  
Fund Name Mid Cap Intrinsic Value Portfolio
Class Name Class S
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class S
$59
1.10%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.10%
AssetsNet $ 112,806,500
Holdings Count | Holding 66
InvestmentCompanyPortfolioTurnover 33.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$112,806,500
Number of Portfolio Holdings
66
Portfolio Turnover Rate
33%
Holdings [Text Block]

Sector Allocation

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Information Technology
28.6%
Industrials
18.3%
Consumer Discretionary
9.8%
Financials
9.0%
Utilities
8.0%
Health Care
7.7%
Energy
4.7%
Real Estate
4.2%
Communication Services
3.5%
Consumer Staples
2.9%
Materials
1.0%
Short-Term Investments
2.3%
Total
100.0%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
Largest Holdings [Text Block]

Top Ten Securities

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Intel Corp.
3.5%
Ryan Specialty Holdings, Inc.
2.6%
Arcosa, Inc.
2.5%
Huntington Bancshares, Inc.
2.4%
IPG Photonics Corp.
2.4%
Coherent Corp.
2.4%
Teledyne Technologies, Inc.
2.3%
Williams Cos., Inc.
2.3%
Lionsgate Studios Corp.
2.3%
State Street Institutional U.S. Government Money Market Fund Premier Class
2.3%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000022328  
Shareholder Report [Line Items]  
Fund Name Quality Equity Portfolio
Class Name Class I
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class I
$46
0.86%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.86%
AssetsNet $ 977,095,567
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$977,095,567
Number of Portfolio Holdings
44
Portfolio Turnover Rate
8%
Holdings [Text Block]

Sector Allocation

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Information Technology
29.7%
Communication Services
19.9%
Financials
17.9%
Consumer Discretionary
13.1%
Health Care
9.2%
Industrials
7.2%
Consumer Staples
1.4%
Energy
1.2%
Materials
0.3%
Short-Term Investments
0.1%
Total
100.0%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
Largest Holdings [Text Block]

Top Ten Securities

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Alphabet, Inc. Class A
12.3%
Amazon.com, Inc.
9.5%
Applied Materials, Inc.
9.1%
Space Exploration Technologies Corp.
6.8%
Interactive Brokers Group, Inc. Class A
5.3%
Berkshire Hathaway, Inc. Class B
4.6%
NVIDIA Corp.
4.3%
Microsoft Corp.
3.6%
Apple, Inc.
3.2%
Taiwan Semiconductor Manufacturing Co. Ltd.
2.8%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000035621  
Shareholder Report [Line Items]  
Fund Name Quality Equity Portfolio
Class Name Class S
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class S
$59
1.12%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.12%
AssetsNet $ 977,095,567
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$977,095,567
Number of Portfolio Holdings
44
Portfolio Turnover Rate
8%
Holdings [Text Block]

Sector Allocation

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Information Technology
29.7%
Communication Services
19.9%
Financials
17.9%
Consumer Discretionary
13.1%
Health Care
9.2%
Industrials
7.2%
Consumer Staples
1.4%
Energy
1.2%
Materials
0.3%
Short-Term Investments
0.1%
Total
100.0%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
Largest Holdings [Text Block]

Top Ten Securities

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Alphabet, Inc. Class A
12.3%
Amazon.com, Inc.
9.5%
Applied Materials, Inc.
9.1%
Space Exploration Technologies Corp.
6.8%
Interactive Brokers Group, Inc. Class A
5.3%
Berkshire Hathaway, Inc. Class B
4.6%
NVIDIA Corp.
4.3%
Microsoft Corp.
3.6%
Apple, Inc.
3.2%
Taiwan Semiconductor Manufacturing Co. Ltd.
2.8%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000022322  
Shareholder Report [Line Items]  
Fund Name Short Duration Bond Portfolio
Class Name Class I
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.neuberger.com/amt. You can also request this information by contacting your financial intermediary or investment provider (such as an insurance company, broker-dealer or bank) or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website www.neuberger.com/amt
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class I
$46
0.93%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.93%
AssetsNet $ 79,181,839
Holdings Count | Holding 542
InvestmentCompanyPortfolioTurnover 35.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$79,181,839
Number of Portfolio Holdings
542
Portfolio Turnover Rate
35%
Holdings [Text Block]

Portfolio by Investment Type

(as a % of Total Net Assets) 

Table Summary
Corporate Bonds
36.3%
Mortgage-Backed Securities
35.4%
Asset-Backed Securities
19.4%
Loan Assignments
2.2%
Municipal Notes
1.5%
Short-Term Investments
3.8%
Other Assets Less Liabilities
1.4%Footnote Reference**
Total
100.0%
FootnoteDescription
Footnote**
Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any.
Largest Holdings [Text Block]

Top Ten Issuers

(as a % of Total InvestmentsFootnote Reference*)

Table Summary
Federal Home Loan Mortgage Corp.
7.0%
Federal National Mortgage Association
6.4%
Federal National Mortgage Association Connecticut Avenue Securities
3.9%
State Street Institutional U.S. Government Money Market Fund
3.8%
Trestles CLO Ltd.
3.1%
BX Trust
2.0%
RR Ltd.
1.8%
Federal Home Loan Mortgage Corp. STACR REMIC Trust
1.7%
Goldman Sachs Group, Inc.
1.7%
Government National Mortgage Association
1.6%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.