# EDGAR Filing Document

**Accession Number:** 0000933691
**File Stem:** 0000933691-25-000335
**Filing Date:** 2025-6
**Character Count:** 27006
**Document Hash:** 76377352f736e59172dcdbdc670e3239
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000933691-25-000335.hdr.sgml**: 20250605

**ACCESSION NUMBER**: 0000933691-25-000335

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250605

**DATE AS OF CHANGE**: 20250605

**EFFECTIVENESS DATE**: 20250605

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** JNL SERIES TRUST
- **CENTRAL INDEX KEY:** 0000933691

**ORGANIZATION NAME:**
- **EIN:** 381659835
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-87244
- **FILM NUMBER:** 251026480

**BUSINESS ADDRESS:**
- **STREET 1:** 1 CORPORATE WAY
- **CITY:** LANSING
- **STATE:** MI
- **ZIP:** 48951
- **BUSINESS PHONE:** (517) 367-4336

**MAIL ADDRESS:**
- **STREET 1:** 1 CORPORATE WAY
- **CITY:** LANSING
- **STATE:** MI
- **ZIP:** 48951

## Series and Classes Contracts Data

### JNL/MELLON S&P 400 MIDCAP INDEX FUND (Series ID: S000001728)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000004635 | JNL/MELLON S&P 400 MIDCAP INDEX FUND (A) |  |
| C000067969 | JNL/MELLON S&P 400 MIDCAP INDEX FUND (I) |  |

#### Summary Prospectus – April 28, 2025, as amended June 5, 2025

#### JNL/Mellon S&P 400 MidCap Index Fund

#### Class A

#### Class I
Before you invest, you may want to review the Fund's Prospectus, which contains more information about the Fund and its risks. You can find the Fund's Prospectus and other information about the Fund, including the Statement of Additional Information ("SAI") and most recent reports to shareholders, online at https://www.jackson.com/fund-literature.html. You can also get this information at no cost by calling 1-800-644-4565 (Annuity and Life Service Center), 1-800-599-5651 (NY Annuity and Life Service Center), 1-800-777-7779 (for contracts purchased through a bank or financial institution) or 1-888-464-7779 (for NY contracts purchased through a bank or financial institution), or by sending an email request to <u>ProspectusRequest@jackson.com</u>. The current Prospectus and SAI, both dated April 28, 2025, as amended, are incorporated by reference into (which means they legally are a part of) this Summary Prospectus.

------

**Investment Objective.** The investment objective of the Fund ("Fund" or "Feeder Fund") is to track the performance of the S&P MidCap 400<sup>®</sup> Index to provide long-term capital growth by investing in equity securities of medium capitalization-weighted domestic corporations through exclusive investment in shares of the JNL Mid Cap Index Fund ("Master Fund").

**Expenses.** This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund.

The expenses do not reflect the expenses of the variable insurance contracts or the separate account through which you indirectly invest in the Fund, whichever may be applicable, and the total expenses would be higher if they were included.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

**Shareholder Fees**<br> **(fees paid directly from your investment)**<br> Not Applicable

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses<br> (Expenses that you pay each year as a percentage of the value of your investment)** | **Annual Fund Operating Expenses<br> (Expenses that you pay each year as a percentage of the value of your investment)** |
|  | **Class A<sup>1</sup>** |
| Management Fee | 0.34% |
| Distribution and/or Service (12b-1) Fees | 0.30% |
| Other Expenses<sup>2</sup> | 0.12% |
| Total Annual Fund Operating Expenses | 0.76% |
| Less Waiver/Reimbursement<sup>3</sup> | 0.20% |
| Total Annual Fund Operating Expenses After Waiver/Reimbursement | 0.56% |

---

<sup>1</sup> The fee table and the example reflect the expenses of both the Fund and the Master Fund.

<sup>2</sup> "Other Expenses" include an Administrative Fee of 0.10% which is payable to Jackson National Asset Management, LLC ("JNAM" or "Adviser").

<sup>3</sup> JNAM has entered into a contractual agreement with the Fund under which it will waive a portion of its management fee for such time as the Fund is operated as a Feeder Fund, because during that time, the Adviser will not be providing the portfolio management portion of the advisory and management services. This fee waiver will continue as long as the Fund is part of a master-feeder fund structure, but in any event, the waiver will continue for at least one year from the date of this Prospectus, and continue thereafter unless the Board of Trustees approves a change in or elimination of the waiver.

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses<br> (Expenses that you pay each year as a percentage of the value of your investment)** | **Annual Fund Operating Expenses<br> (Expenses that you pay each year as a percentage of the value of your investment)** |
|  | **Class I<sup>1</sup>** |
| Management Fee | 0.34% |
| Distribution and/or Service (12b-1) Fees | 0.00% |
| Other Expenses<sup>2</sup> | 0.12% |
| Total Annual Fund Operating Expenses | 0.46% |
| Less Waiver/Reimbursement<sup>3</sup> | 0.20% |
| Total Annual Fund Operating Expenses After Waiver/Reimbursement | 0.26% |

---

<sup>1</sup> The fee table and the example reflect the expenses of both the Fund and the Master Fund.

<sup>2</sup> "Other Expenses" include an Administrative Fee of 0.10% which is payable to Jackson National Asset Management, LLC ("JNAM" or "Adviser").

<sup>3</sup> JNAM has entered into a contractual agreement with the Fund under which it will waive a portion of its management fee for such time as the Fund is operated as a Feeder Fund, because during that time, the Adviser will not be providing the portfolio management portion of the advisory and management services. This fee waiver will continue as long as the Fund is part of a master-feeder fund structure, but in any event, the waiver will continue for at least one year from the date of this Prospectus, and continue thereafter unless the Board of Trustees approves a change in or elimination of the waiver.

**Expense Example.** <sup>(1)</sup> This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Also, this example does not reflect the expenses of the variable insurance contracts or the separate account through which you indirectly invest in the Fund, whichever may be applicable, and the total expenses would be higher if they were included. The table below shows the expenses you would pay on a $10,000 investment, assuming (1) 5% annual return; (2) redemption at the end of each time period; and (3) that the Fund operating expenses remain the same. The example also assumes that the contractual expense limitation agreement is discontinued after one year. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

---

| | | | |
|:---|:---|:---|:---|
| **JNL/Mellon S&P 400 MidCap Index Fund Class A** | **JNL/Mellon S&P 400 MidCap Index Fund Class A** | **JNL/Mellon S&P 400 MidCap Index Fund Class A** | **JNL/Mellon S&P 400 MidCap Index Fund Class A** |
| 1 year | 3 years | 5 years | 10 years |
| $57 | $223 | $403 | $924 |

---

---

| | | | |
|:---|:---|:---|:---|
| **JNL/Mellon S&P 400 MidCap Index Fund Class I** | **JNL/Mellon S&P 400 MidCap Index Fund Class I** | **JNL/Mellon S&P 400 MidCap Index Fund Class I** | **JNL/Mellon S&P 400 MidCap Index Fund Class I** |
| 1 year | 3 years | 5 years | 10 years |
| $27 | $127 | $238 | $560 |

---

<sup>(1)</sup> The example reflects the aggregate expenses of both the Fund and the Master Fund.

**Portfolio Turnover (% of average value of portfolio).** The Fund, which operates as a "feeder fund," does not pay transaction costs, such as commissions, when it buys and sells shares of the Master Fund (or "turns over" its portfolio). The Master Fund 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. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Example above, affect the Fund's and Master Fund's performance. The following table shows the Master Fund's portfolio turnover rate during the most recent fiscal year.

---

| | |
|:---|:---|
| **Period** | **Master Fund** |
| 1/1/2024 - 12/31/2024 | 16% |

---

**Principal Investment Strategies.** The Fund operates as a "feeder fund" and seeks to achieve its goal by investing all of its assets in Class I shares of the Master Fund.

The Master Fund invests, under normal circumstances, at least 80% of its assets (net assets plus the amount of any borrowings made for investment purposes) in the stocks in the S&P MidCap 400<sup>®</sup> Index ("Index") in proportion to their market capitalization weighting in the Index. The Master Fund employs a passive investment approach, called indexing, which attempts to replicate the investment performance of the Index through representative sampling. The Master Fund does not employ traditional methods of active investment management, which involves the buying and selling of securities based upon security analysis. The Master Fund attempts to replicate the Index by investing all or substantially all of its assets in the stocks that make up the Index. As of December 31, 2024, the market capitalization range of the Index is $955 million to $23.56 billion. Indexing may offer a cost-effective investment approach to gaining diversified market exposure over the long term.

When attempting to replicate a capitalization-weighted index such as the Index, portfolio turnover is reduced to what the index adds and deletes, contract owner contributions and withdrawals, and reinvestment of income. The replicated portfolio does not require rebalancing as a result of market movement. It is rebalanced automatically with the change in share prices of the securities owned. The Master Fund's holdings are rebalanced on a regular basis to reflect changes in the composition of the Index.

The Master Fund may also invest in a combination of exchange-traded funds ("ETFs") and cash to maintain correlation to its index, to assist with index rebalances, and to meet redemption or purchase requests.

The Master Fund may invest in financial futures, a type of derivative that may be used to obtain exposure to a variety of underlying assets, to provide liquidity for cash flows, to hedge dividend accruals or for other purposes that facilitate meeting the Master Fund's objective. The Master Fund's use of financial futures is intended to assist replicating the investment performance of the Index.

**Principal Risks of Investing in the Fund.** An investment in the Fund is not guaranteed. As with any mutual fund, the value of the Fund's shares will change, and you could lose money by investing in the Fund. The principal risks associated with investing in the Fund include:

&nbsp;&nbsp;&nbsp;&nbsp;• *Market risk* – Portfolio
 securities may decline in value due to factors affecting securities markets generally, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates or adverse investor
 sentiment, public health issues, including widespread disease and virus epidemics or pandemics, war, terrorism or natural disasters, among others. Adverse market conditions may be prolonged and may not have the same impact on all types of
 securities. The values of securities may fall due to factors affecting a particular issuer, industry or the securities market as a whole.

&nbsp;&nbsp;&nbsp;&nbsp;• *Equity securities risk* –
 Common and preferred stocks represent equity ownership in a company. Stock markets are volatile, and equity securities generally have greater price volatility than fixed-income securities. The price of equity or equity-related securities
 will fluctuate and can decline and reduce the value of a portfolio investing in equity or equity-related securities. The value of equity or equity-related securities purchased or held by the Master Fund could decline if the financial
 condition of the companies the Master Fund invests in decline or if overall market and economic conditions deteriorate. They may also decline due to factors that affect a particular industry or industries, such as labor shortages or an
 increase in production costs and competitive conditions within an industry. In addition, they may decline due to general market conditions that are not specifically related to a company or industry, such as real or perceived adverse economic
 conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates or generally adverse investor sentiment.

&nbsp;&nbsp;&nbsp;&nbsp;• *Mid-capitalization investing risk* **–** The stocks of mid-capitalization companies can be more volatile and their shares can be less liquid than those of larger
 companies. Mid-capitalization companies may have limited product lines, markets or financial resources or may depend on the expertise of a few people and may be subject to more abrupt or erratic market movements than securities of larger,
 more established companies or the market averages in general. Securities of such issuers may lack sufficient market liquidity to effect sales at an advantageous time or without a substantial drop in price.

&nbsp;&nbsp;&nbsp;&nbsp;• *License termination risk* **–** The Master Fund may rely on licenses from a third party (licensor) that permit the Master Fund to use that party's intellectual property in
 connection with the Master Fund's name and/or investment strategies. The license may be terminated by the licensor, and as a result the Master Fund may lose its ability to use the licensed name or strategy, or receive important data from the
 licensor. Accordingly, a license may have a significant effect on the future operation of the Master Fund, including the need to change the investment strategy.

&nbsp;&nbsp;&nbsp;&nbsp;• *Derivatives risk* **–** Investments in derivatives, which are financial instruments whose value depends on, or is derived from, the value of underlying assets,
 reference rates, or indices, can be highly volatile and may be subject to transaction costs and certain risks, such as unanticipated changes in securities prices and global currency investment. Derivatives also are subject to leverage risk,
 liquidity risk, interest rate risk, market risk, counterparty risk, and credit risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate perfectly with the
 underlying asset, interest rate or index. Gains or losses from derivatives can be substantially greater than the derivatives' original cost.

&nbsp;&nbsp;&nbsp;&nbsp;• *Exchange-traded funds investing risk –* An investment in an ETF generally presents the following risks: (i) the same primary risks as an investment in a conventional fund (i.e., one that is not exchange-traded) that has the same investment objectives, strategies
 and policies; (ii) the risk that an ETF may fail to accurately track the market segment or index that underlies its investment objective; (iii) price fluctuation, resulting in a loss to the Master Fund; (iv) the risk that an ETF may trade at
 a discount to its net asset value; (v) the risk that an active market for an ETF's shares may not develop or be maintained; and (vi) the risk that an ETF may no longer meet the listing requirements of any applicable exchanges on which that
 ETF is listed. When the Master Fund invests in an ETF, shareholders of the Master Fund bear their proportionate share of the ETF's fees and expenses as well as their share of the Master Fund's fees and expenses.

&nbsp;&nbsp;&nbsp;&nbsp;• *Financial services risk* –
 An investment in issuers in the financial services sector may be adversely affected by, among other things: (i) changes in the regulatory framework or interest rates that may negatively affect financial service businesses; (ii) exposure of a
 financial institution to a non-diversified or concentrated loan portfolio; (iii) exposure to financial leverage and/or investments or agreements which, under certain circumstances, may lead to losses (e.g., sub-prime loans); and (iv) the risk
 that a market shock or other unexpected market, economic, political, regulatory, public health or other event might lead to a sudden decline in the values of most or all companies in the financial services sector.

&nbsp;&nbsp;&nbsp;&nbsp;• *Index investing risk –* The
 Master Fund's indexing strategy does not attempt to manage volatility, use defensive strategies, or reduce the effects of any long-term periods of poor stock performance. Should the Master Fund engage in index sampling, the performance of
 the securities selected will not provide investment performance tracking that of the Index. Master Fund performance may not exactly correspond with the performance of the relevant index for a number of reasons, including, but not limited to:
 the timing of purchases and redemptions of the Fund's shares, changes in the composition of the index, and the Fund's expenses. Certain regulatory limitations, such as fund diversification requirements, may limit the ability of the Master
 Fund to completely replicate an index.

&nbsp;&nbsp;&nbsp;&nbsp;• *Large-capitalization investing risk* – Large-capitalization stocks as a group could fall out of favor with the market, which may cause the Master Fund to
 underperform funds that focus on other types of stocks.

&nbsp;&nbsp;&nbsp;&nbsp;• *Passive investment risk* –
 The Master Fund is not actively managed. Unlike with an actively managed fund, the Master Fund does not use techniques or defensive strategies designed to lessen the effects of market volatility or to reduce the impact of periods of market
 decline. This means that, based on market and economic conditions, the Master Fund's performance could be lower than actively managed funds that realign their portfolios more frequently based on the real-time market trends.

&nbsp;&nbsp;&nbsp;&nbsp;• *Tracking error risk* –
 Tracking error is the divergence of the Fund's performance from that of the Index. The Master Fund's return may not track the return of the Index for a number of reasons. Tracking error may occur because of differences between the securities
 and other instruments held in the Master Fund's portfolio and those included in the Index, pricing differences, differences in transaction costs, the Master Fund's holding of uninvested cash, differences in timing of the accrual of or the
 valuation of dividends or interest, tax gains or losses, changes to the Index or the costs to the Master Fund of complying with various new or existing regulatory requirements. This risk may be heightened during times of increased market
 volatility or other unusual market conditions. Tracking error also may result because the Fund incurs fees and expenses, while the Index does not. However, the Master Fund may be required to deviate its investments from the securities and
 relative weightings of the Index to comply with the 1940 Act, as amended to meet the issuer diversiﬁcation requirements of the Internal Revenue Code of 1986, as amended, applicable to regulated investment companies, or as a result of local
 market restrictions, or other legal reasons, including regulatory limits or other restrictions on securities that may be purchased by the Investment Adviser and its afﬁliates.

&nbsp;&nbsp;&nbsp;&nbsp;• *Securities lending risk* –
 Securities lending involves the risk of loss or delays in recovery of the loaned securities or loss of rights in the collateral if the borrower fails to return the security loaned or becomes insolvent.

<br>**Performance.** Prior to April 26, 2021, the Fund was managed by JNAM and implemented its investment strategy directly through a sub-adviser. Effective April 26, 2021, the Fund operates as a "feeder fund" of the Master Fund. Performance prior to April 26, 2021 reflects the Fund's results when its investment strategy was implemented by a sub-adviser rather than via investment in the Master Fund. The performance information shown provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns compared with those of a broad-based securities market index and an additional index that the Adviser believes more closely reflects the market segments in which the Fund invests. Performance results include the effect of expense waiver/reduction arrangements for some or all of the periods shown. If such arrangements had not been in place, performance for those periods would have been lower. The Fund's past performance is not necessarily an indication of how the Fund will perform in the future.

The returns shown in the bar chart and table do not include charges that will be imposed by variable insurance products. If these amounts were reflected, returns would be less than those shown.

Effective April 27, 2020, the Fund was combined with JNL/S&P Mid 3 Fund (the "Acquired Fund"), with the Fund as the surviving Fund. The performance shown is the Fund's historic performance and does not reflect the performance of the Acquired Fund.

Effective April 29, 2024, the Morningstar<sup>®</sup> US Market Extended Index℠ replaced the S&P MidCap 400<sup>®</sup> Index as the Fund's broad-based securities market index in accordance with new regulatory disclosure requirements. The S&P MidCap 400<sup>®</sup> Index is included as an additional index for the Fund because the Adviser believes it more closely reflects the market segments in which the Fund invests.

#### Annual Total Returns as of December 31

#### Class A
![](image0.jpg)

**Best Quarter (ended 12/31/2020):** 24.21%; **Worst Quarter (ended 3/31/2020):** -29.80%

#### Annual Total Returns as of December 31

#### Class I
![](image1.jpg)

**Best Quarter (ended 12/31/2020):** 24.31%; **Worst Quarter (ended 3/31/2020):** -29.73%

---

| | | | |
|:---|:---|:---|:---|
| **Average Annual Total Returns as of 12/31/2024** | | | |
|  | **1 year** | **5 year** | **10 year** |
| JNL/Mellon S&P 400 MidCap Index Fund (Class A) | 13.34% | 9.74% | 9.10% |
| Morningstar US Market Extended Index (reflects no deduction for fees, expenses, or taxes) | 23.81% | 13.84% | 12.56% |
| S&P MidCap 400 Index (reflects no deduction for fees, expenses, or taxes) | 13.93% | 10.34% | 9.68% |

---

---

| | | | |
|:---|:---|:---|:---|
| **Average Annual Total Returns as of 12/31/2024** | | | |
|  | **1 year** | **5 year** | **10 year** |
| JNL/Mellon S&P 400 MidCap Index Fund (Class I) | 13.67% | 10.07% | 9.36% |
| Morningstar US Market Extended Index (reflects no deduction for fees, expenses, or taxes) | 23.81% | 13.84% | 12.56% |
| S&P MidCap 400 Index (reflects no deduction for fees, expenses, or taxes) | 13.93% | 10.34% | 9.68% |

---

#### Portfolio Management.
**Investment Adviser to the Fund:**<br> Jackson National Asset Management, LLC ("JNAM")

Currently, JNAM provides those services that are normally provided by a fund's investment adviser with the exception of portfolio management. See the Additional Information About Each Fund section for more information regarding management of the Fund.

**Investment Sub-Adviser to the Master Fund:**<br> Mellon Investments Corporation ("Mellon")

#### Portfolio Managers:

---

| | | |
|:---|:---|:---|
| **Name:** | **Joined Fund Management Team In:** | **Title:** |
| Marlene Walker Smith | October 2020\* | Senior Director and Chief Investment Officer, Mellon |
| David France, CFA | October 2020\* | Senior Vice President and Senior Portfolio Manager, Mellon |
| Todd Frysinger, CFA | October 2020\* | Senior Vice President and Senior Portfolio Manager, Mellon |
| Vlasta Sheremeta, CFA | October 2020\* | Senior Vice President and Senior Portfolio Manager, Mellon |
| Michael Stoll | October 2020\* | Senior Vice President and Senior Portfolio Manager, Mellon |

---

\* Prior to April 26, 2021, the Fund was managed by JNAM and implemented its investment strategy directly through a sub-adviser. Effective April 26, 2021, the Fund operates as a "feeder fund" of the Master Fund. These dates refer to the time during which the Fund was managed by JNAM and implemented its investment strategy directly through Mellon as sub-adviser.

#### Purchase and Redemption of Fund Shares
Only separate accounts of Jackson National Life Insurance Company ("Jackson National") or Jackson National Life Insurance Company of New York ("Jackson National NY") and series, including fund of funds, of registered investment companies in which either or both of those insurance companies invest may purchase shares of the Fund. You may invest indirectly in the Fund through your purchase of a variable annuity or life insurance contract issued by a separate account of Jackson National or Jackson National NY that invests directly, or through a fund of funds, in this Fund. Any minimum initial or subsequent investment requirements and redemption procedures are governed by the applicable separate account through which you invest indirectly.

This Fund serves as an underlying investment by insurance companies, affiliated investment companies, and retirement plans for funding variable annuity and life insurance contracts and retirement plans.

#### Tax Information
The Fund expects to be treated as a partnership for U.S. federal income tax purposes, and does not expect to make regular distributions (other than in redemption of Fund shares) to shareholders, which generally are the participating insurance companies investing in the Fund through separate accounts of Jackson National or Jackson National NY and mutual funds owned directly or indirectly by such separate accounts. You should consult the prospectus of the appropriate separate account or description of the plan for a discussion of the U.S. federal income tax consequences to you of your contract, policy, or plan.

#### Payments to Broker-Dealers and Financial Intermediaries
If you invest in the Fund under a variable insurance contract or a plan that offers a variable insurance contract as a plan option through a broker-dealer or other financial intermediary (such as a financial institution), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's Website for more information.