# EDGAR Filing Document

**Accession Number:** 0000790166
**File Stem:** 0001193125-26-192454
**Filing Date:** 2026-4
**Character Count:** 22299
**Document Hash:** 26ee10479a0aaca9eb6084883b5d6b07
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-192454.hdr.sgml**: 20260430

**ACCESSION NUMBER**: 0001193125-26-192454

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260430

**DATE AS OF CHANGE**: 20260429

**EFFECTIVENESS DATE**: 20260430

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** THRIVENT SERIES FUND INC
- **CENTRAL INDEX KEY:** 0000790166

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-03677
- **FILM NUMBER:** 26918419

**BUSINESS ADDRESS:**
- **STREET 1:** 901 MARQUETTE AVENUE, SUITE 2500
- **CITY:** MINNEAPOLIS
- **STATE:** MN
- **ZIP:** 55402-3211
- **BUSINESS PHONE:** 612-844-7190

**MAIL ADDRESS:**
- **STREET 1:** 901 MARQUETTE AVENUE, SUITE 2500
- **CITY:** MINNEAPOLIS
- **STATE:** MN
- **ZIP:** 55402-3211

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LB SERIES FUND INC
- **DATE OF NAME CHANGE:** 19950428

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LBVIP SERIES FUND INC/
- **DATE OF NAME CHANGE:** 19940824

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LBVIP SERIES FUND INC
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### Thrivent ESG Index Portfolio (Series ID: S000068343)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000218692 | Class A      |  |

![](g875739thrivent_blreg.jpg)

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| | |
|:---|:---|
| **April 30, 2026** | &nbsp;&nbsp; ![](g875739img795f8dd51.jpg)<br>|

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**Thrivent ESG Index Portfolio**

Summary Prospectus

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This Summary Prospectus is designed to provide investors with key portfolio information in a clear and concise format. Before you invest, you may want to review the Portfolio's complete prospectus, which contains more information about the Portfolio and its risks.

**• If you purchase shares through Thrivent:**

You can find the Portfolio's prospectus, reports to shareholders, and other information about the Portfolio online at thriventportfolios.com/prospectus. You can also get this information at no cost by calling 800-847-4839 or by sending an email request to mail@thrivent.com.

**• If you purchase shares from a firm other than Thrivent:**

You can find the Portfolio's prospectus, reports to shareholders, and other information about the Portfolio online at thriventportfolios.com/prospectus. You can also get this information by calling or emailing your financial professional.

The Portfolio's prospectus and Statement of Additional Information, both dated Apr. 30, 2026, as revised or supplemented from time to time, are incorporated by reference into this Summary Prospectus and may be obtained, free of charge, at the website, phone number or email address noted above.

Shares of the Portfolio are sold only to insurance company separate accounts or to other investment companies funded by insurance company separate accounts. This Summary Prospectus is not intended for use by other investors.

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Thrivent ESG Index Portfolio

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Investment Objective

Thrivent ESG Index Portfolio (the "Portfolio") seeks to track the investment results of an index composed of companies selected by the index provider based on environmental, social and governance characteristics. The Portfolio's investment objective may be changed without shareholder approval.

Fees and Expenses

The table below describes the fees and expenses that you may pay if you buy, hold and/or sell shares of the Portfolio. If you own a variable annuity contract or variable life insurance contract, you will have additional fees and expenses. Please refer to the prospectus for your variable contract for additional information about fees and expenses associated with your contract.

**Shareholder Fees** 

(fees paid directly from your investment)

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| |
|:---|
| &nbsp;&nbsp; Maximum Sales Charge (load) Imposed On <br> Purchases (as a % of offering price)<br>|
| &nbsp;&nbsp; Maximum Deferred Sales Charge (load) (as a % of <br> the net asset value)<br>|

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**Annual Portfolio Operating Expenses**

(expenses that you pay each year as a percentage of the value of your investment)

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| | |
|:---|:---|
| Management Fees | 0.20% |
| Other Expenses | 0.31% |
| Acquired Fund Fees and Expenses | 0.02% |
| Total Annual Portfolio Operating Expenses | 0.53% |
| &nbsp;&nbsp; Less Fee Waivers and/or Expense <br> Reimbursements<sup>1</sup> <br>| 0.17% |
| &nbsp;&nbsp; Total Annual Portfolio Operating Expenses After Fee <br> Waivers and/or Expense Reimbursements<br>| 0.36% |

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<sup>1</sup>

The Adviser has contractually agreed, through at least April 30, 2027, to waive certain fees and/or reimburse certain expenses associated with the shares of the Thrivent ESG Index Portfolio in order to limit the Total Annual Portfolio Operating Expenses After Fee Waivers and/or Expense Reimbursements to an annual rate of 0.34% of the average daily net assets of the shares. This contractual provision, however, may be terminated before the indicated termination date upon the mutual agreement between the Independent Directors of the Portfolio and the Adviser.

**Example**

The example below is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Portfolio is an investment option for variable contracts, and the example does not include charges imposed by variable contracts. If variable contract charges were included, your expenses would be higher than those shown. The example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. In addition, the example for the 1 Year period reflects the effect of the contractual fee waiver and/or expense reimbursement. The example also assumes that your investment has a 5% return each year, and that the Portfolio's operating

expenses remain the same. Although your actual cost may be higher or lower, based on the foregoing assumptions, your cost would be:

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| | | | |
|:---|:---|:---|:---|
| **1 Year** | **3 Years** | **5 Years** | **10 Years** |
| $37 | $153 | $279 | $649 |

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**Portfolio Turnover**

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 12% of the average value of its portfolio.

Principal Strategies

Under normal circumstances, the Portfolio invests substantially all of its assets (more than 80% of its net assets, plus the amount of any borrowings for investment purposes) in the common stocks of companies included in the MSCI KLD 400 Social Index (the "Index") in the proportions in which they are represented in the Index. Should the Adviser change the investments used for purposes of this 80% threshold, you will be notified at least 60 days prior to the change. This is a passively managed Portfolio, which means that the Adviser does not actively choose the securities that should make up the Portfolio. The Index is a float-adjusted market capitalization weighted index designed to provide exposure to U.S. companies with outstanding environmental, social and governance ("ESG") ratings and excluding exposure to companies with negative social or environmental impacts, all as identified by MSCI Inc. (the "Index Provider" or "MSCI"). As of March 31, 2026, the Index consisted of 402 companies identified by the Index Provider from the universe of companies included in the MSCI USA IMI Index, which targets approximately 99% of the market coverage of stocks that are listed for trading on major exchanges in the U.S., as determined by the Index Provider. MSCI constructs the Index based on considerations of ESG performance, sector alignment and size representation of each eligible company, as described in more detail below. The methodology MSCI uses to construct the Index is as of the date of this prospectus and is subject to change as determined from time to time by MSCI. The Index excludes companies whose products have negative social or environmental impacts. Companies that MSCI determines have significant involvement in the following businesses are not eligible for the Index: alcohol, gambling, tobacco, military weapons, civilian firearms, nuclear power, adult entertainment and genetically modified organisms.

In evaluating ESG performance of eligible companies, MSCI uses proprietary ratings and research covering ESG criteria. MSCI identifies companies that demonstrate an ability to manage their ESG risks and opportunities. MSCI identifies key ESG issues that hold the greatest potential risk or opportunity for each industry

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sector, which may include the following: climate change, natural resources, pollution and waste, environmental opportunities, human capital, product liability, stakeholder opposition, social opportunities, corporate governance, and corporate behavior. MSCI calculates a company's exposure relating to a key issue based on an analysis of a company's business and takes into account a company's management process of that issue. MSCI's ESG criteria also includes, but is not limited to, an analysis of companies involved in very serious controversies, which may result in those companies' exclusion from the Index.

The Index is reviewed quarterly for adjustments, and when changes to the Index occur, the Adviser will attempt to replicate these changes within the Portfolio. However, any such changes may result in slight variations from time to time. The Index may include large, mid or small cap companies. The components of the Index, and the degree to which these components represent certain industry sectors, are likely to change over time. The Portfolio may buy and sell equity index futures and exchange traded funds ("ETF") for investment exposure. For liquidity reasons, the Portfolio may invest to some degree in money market instruments.

The Portfolio intends to be diversified in approximately the same proportion as the Index is diversified. The Portfolio may become "non-diversified" as defined under the Investment Company Act of 1940, as amended (the "1940 Act"), solely because of a change in relative market capitalization or index weighting of one or more constituents of the Index. A "non-diversified" fund under the 1940 Act may invest a greater percentage of its assets in the securities of a limited number of issuers relative to a diversified fund. Shareholder approval will not be sought if the Portfolio crosses from diversified to non-diversified status under such circumstances.

Principal Risks

The Portfolio is subject to the following principal investment risks, which you should review carefully and in entirety. An investment in the Portfolio is not a deposit or other obligation of Thrivent Trust Company, Thrivent Bank, or any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other federal agency. The Portfolio may not achieve its investment objective and you could lose money by investing in the Portfolio.

**ESG (Environmental, Social & Governance) Investment Strategy Risk.** The Portfolio's ESG investment strategy limits the types and number of investment opportunities available to the Portfolio and, as a result, the Portfolio may underperform other funds that do not have an ESG focus. The Portfolio's ESG investment strategy may result in the Portfolio investing in securities or industry sectors that underperform the market as a whole or underperform other funds screened for ESG standards. In addition, the Index Provider may be unsuccessful in creating an index composed of companies that exhibit positive ESG characteristics.

**Equity Security Risk.** Equity securities held by the Portfolio may decline significantly in price, sometimes rapidly or unpredictably, over short or extended periods of time, and such declines may occur because of declines in the equity market as a whole, or because of declines in only a particular country, geographic region, company, industry, or sector of the market. From time to time, the Portfolio may invest a significant portion of its assets in companies in one particular country or geographic region or one or more related sectors or industries, which would make the Portfolio more vulnerable to adverse developments affecting such countries, geographic regions, sectors or industries. Equity

securities generally do not move in the same direction at the same time and are generally more volatile than most debt securities.

**ETF Risk.** An ETF is subject to the risks of the underlying investments that it holds. In addition, for index-based ETFs, the performance of an ETF may diverge from the performance of such index (commonly known as tracking error). ETFs are subject to fees and expenses (like management fees and operating expenses) that do not apply to an index, and the Portfolio will indirectly bear its proportionate share of any such fees and expenses paid by the ETFs in which it invests. Because ETFs trade on an exchange, there is a risk that an ETF will trade at a discount to net asset value or that investors will fail to bring the trading price in line with the underlying shares (known as the arbitrage mechanism). There is the possibility that an ETF may experience a lack of liquidity that can result in greater volatility than its underlying securities.

**Futures Contract Risk.** The value of a futures contract tends to increase and decrease in tandem with the value of the underlying instrument. The price of futures can be highly volatile; using them could lower total return, and the potential loss from futures can exceed the Portfolio's initial investment in such contracts. In addition, the value of the futures contract may not accurately track the value of the underlying instrument.

**Indexing Strategy/Index Tracking Risk.** The Portfolio is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. The structure and composition of the Index will affect the performance, volatility, and risk of the Index and, consequently, the performance, volatility, and risk of the Portfolio. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Portfolio's return may not match the return of the Index. The Portfolio incurs a number of operating expenses not applicable to the Index and incurs costs in buying and selling securities. In addition, the Portfolio may not be fully invested at times, generally as a result of cash flows into or out of the Portfolio or reserves of cash held by the Portfolio to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Portfolio's return and that of the Index.

**Issuer Risk.** Issuer risk is the possibility that factors specific to an issuer to which the Portfolio is exposed will affect the market prices of the issuer's securities and therefore the value of the Portfolio.

**Large Cap Risk.** Large-sized companies may be unable to respond quickly to new competitive challenges such as changes in technology. They may also not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.

**Market Risk.** Over time, securities markets generally tend to move in cycles with periods when security prices rise and periods when security prices decline. The value of the Portfolio's investments may move with these cycles and, in some instances, increase or decrease more than the applicable market(s) as measured by the Portfolio's benchmark index(es). The securities markets may also decline because of factors that affect a particular industry or market sector, or due to impacts from domestic or global events, including regulatory events, economic downturn, government shutdowns, the spread of infectious illness such as the outbreak of COVID-19, public health crises, war, terrorism, social unrest, recessions, natural disasters or similar events.

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**Mid Cap Risk.** Medium-sized companies often have greater price volatility, lower trading volume, and less liquidity than larger, more-established companies. These companies tend to have smaller revenues, narrower product lines, less management depth and experience, smaller shares of their product or service markets, fewer financial resources, and less competitive strength than larger companies.

**Non-Diversified Risk.** In seeking to track the Index, the Portfolio may become non-diversified as a result of a change in relative market capitalization or index weighting of one or more constituents of the Index. That means the Portfolio may invest a greater percentage of its assets in the securities of any single issuer compared to other funds. A non-diversified portfolio is generally more susceptible than a diversified portfolio to the risk that events or developments affecting a particular issuer or industry will significantly affect the Portfolio's performance.

**Sector Risk.** Companies with similar characteristics may be grouped together in broad categories called sectors. From time to time, the Portfolio may have significant positions in one or more sectors of the market. To the extent the Portfolio invests more heavily in particular sectors than others, its performance may be more susceptible to developments that significantly affect those sectors. Individual sectors may be more volatile, and may perform differently, than the broader market. The industries that constitute a sector may all react in the same way to economic, political or regulatory events.

Performance

The following bar chart and table beneath it provide some indication of the risks of investing in the Portfolio. The bar chart and table include the effects of Portfolio expenses, but not charges or deductions against your variable contract. They also assume that you sold your investment at the end of the period. The bar chart shows the Portfolio's performance from year to year while the table shows how the Portfolio's average annual returns for the indicated periods compare with those of an appropriate broad-based securities market index and a more narrowly based index. Because shares of the Portfolio are offered through variable life insurance and variable annuity contracts, you should carefully review the variable contract prospectus for information on applicable charges and expenses. If the charges and deductions against your variable contract were included, returns would be lower than those shown.

The Portfolio's past performance is not necessarily an indication of how it will perform in the future. Updated performance information is available on the Portfolio's website at thrivent.com or by calling 800-847-4836.

The Portfolio compares its performance to the Russell 3000® Index, an appropriate broad-based securities market index that represents the overall domestic equity market in which the Portfolio may invest. The Portfolio also compares its performance to the MSCI KLD 400 Social Index, which more closely reflects the market segments in which the Portfolio invests. The index descriptions appear in the "Index Descriptions" section of the prospectus.

**Year-by-Year Total Return**

![](g875739teip.jpg)

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| | | |
|:---|:---|:---|
| Best Quarter: | Q2 2025 | +13.73% |
| Worst Quarter: | Q2 2022 | (16.76)% |

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**Average Annual Total Returns**

(Periods Ending December 31, 2025)

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| | | | |
|:---|:---|:---|:---|
|  |  |  | **Since**<br> **Inception**<br>|
|  | **1 Year** | **5 Years** | **4/29/2020** |
| Portfolio (before taxes) | 17.78% | 13.56% | 17.06% |
| Russell 3000® Index<br> (reflects no deduction for <br> fees, expenses or taxes)<br>| 17.15% | 13.15% | 17.29% |
| MSCI KLD 400 Social Index<br> (reflects no deduction for <br> fees, expenses or taxes)<br>| 18.23% | 14.06% | 17.59% |

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Management

**Investment Adviser**

The Portfolio is managed by Thrivent Financial for Lutherans ("Thrivent" or the "Adviser").

**Portfolio Managers**

The following individuals are jointly and primarily responsible for the day-to-day management of the Portfolio:

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| | |
|:---|:---|
| **Name and Title** | **Portfolio Manager** <br> **of the Portfolio** <br> **Since**<br>|
| Brian W. Bomgren, CQF<br> Senior Portfolio Manager<br>| April 2020 |
| Sharon Wang, CFA, FRM<br> Senior Portfolio Manager<br>| April 2020 |

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Purchase and Sale of Shares

Shares of each series of Thrivent Series Fund, Inc. (the "Fund") may be sold, without any minimum initial or subsequent investment requirements, only to:

• Separate accounts of Thrivent;

• Separate accounts of other insurance companies not affiliated with Thrivent; and

• Other Portfolios of the Fund.

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Tax Information

For information about certain tax-related aspects of investing in the Portfolio through a variable contract, please see the variable product prospectus.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase your variable contract through a broker-dealer or other financial intermediary, Thrivent, the other issuing insurance company or their related companies may pay the intermediary for

the sale of the contract, the selection of the Portfolio and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial professional to recommend the Portfolio over another investment. Ask your financial professional or visit your financial

intermediary's website for more information.

32065AQ R4-26

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