# EDGAR Filing Document

**Accession Number:** 0000732697
**File Stem:** 0001410368-26-010564
**Filing Date:** 2026-2
**Character Count:** 15572
**Document Hash:** d89bf4c803b5ae7e9ca560fdc569fae3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-010564.hdr.sgml**: 20260210

**ACCESSION NUMBER**: 0001410368-26-010564

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260210

**DATE AS OF CHANGE**: 20260210

**PERIOD START**: 20251231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ULTRA SERIES FUND
- **CENTRAL INDEX KEY:** 0000732697

**ORGANIZATION NAME:**
- **EIN:** 392004659
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04815
- **FILM NUMBER:** 26614652

**BUSINESS ADDRESS:**
- **STREET 1:** 550 SCIENCE DRIVE
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53711
- **BUSINESS PHONE:** 6082740300

**MAIL ADDRESS:**
- **STREET 1:** 550 SCIENCE DRIVE
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53711

## Series and Classes Contracts Data

### Mid Cap Fund (Series ID: S000019983)

| Class ID   | Class Name            | Ticker Symbol   |
|:---|:---|:---|
| C000056041 | Mid Cap Fund Class I  |  |
| C000074788 | Mid Cap Fund Class II |  |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** ULTRA SERIES FUND

- **b. Investment Company Act file number:** 811-04815

- **c. CIK number of Registrant:** 0000732697

- **d. LEI of Registrant:** 254900JPNAJ16VJV5X45

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 550 SCIENCE DRIVE

  - **City:** MADISON

  - **State:** WI

  - **Foreign country:** US

  - **Zip / Postal Code:** 53711

  - **Telephone number:** 608-274-0300

**Item A.2. Information about the Series.**

- **a. Name of Series:** Mid Cap Fund

- **b. EDGAR series identifier (if any):** S000019983

- **c. LEI of Series:** 2549003E389BDUF7PS08

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-12-31

- **b. Date as of which information is reported:** 2025-12-31

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $111518057.95

**Total Liabilities:** $123990.00

**Net Assets:** $111394067.95

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000056041 | -1.95%               | 0.47%                | 0.40%                |
| Class ID C000074788 | -1.97%               | 0.45%                | 0.38%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $3563605.17              | $-5792664.80                               |
| Month 2  | $-1263216.80             | $1641681.65                                |
| Month 3  | $2958325.37              | $-2632187.31                               |

### Schedule of Portfolio Investments

| Name                                       | Title                                                      | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| Amphenol Corp                              | Amphenol Corp.                                             | CUSIP: 032095101<br>LEI: 549300D3L3G0R4U4VT04 | Long             | EC               | CORP              | US        |     36677 | NS      | $4956529.78   | 4.45%             |  |  |  | No            |                  1 | On Loan: No      |
| Arista Networks Inc                        | Arista Networks, Inc.                                      | CUSIP: 040413205<br>LEI: 635400H1WKBLOQERUU95 | Long             | EC               | CORP              | US        |     14917 | NS      | $1954574.51   | 1.75%             |  |  |  | No            |                  1 | On Loan: No      |
| Asbury Automotive Group Inc                | Asbury Automotive Group, Inc.                              | CUSIP: 043436104<br>LEI: 549300JH4DTA7U42GL91 | Long             | EC               | CORP              | US        |      9875 | NS      | $2296233.75   | 2.06%             |  |  |  | No            |                  1 | On Loan: No      |
| W R Berkley Corp                           | W.R. Berkley Corp.                                         | CUSIP: 084423102<br>LEI: SQOAGCLKBDWNVYV1OV80 | Long             | EC               | CORP              | US        |     47473 | NS      | $3328806.76   | 2.99%             |  |  |  | No            |                  1 | On Loan: No      |
| Bio-Techne Corp                            | Bio-Techne Corp.                                           | CUSIP: 09073M104<br>LEI: 54930073RLKQ51TILZ35 | Long             | EC               | CORP              | US        |     33268 | NS      | $1956491.08   | 1.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Brookfield Asset Management Ltd            | Brookfield Asset Management Ltd.                           | CUSIP: 113004105<br>LEI: 549300CZ84WPNJZKY093 | Long             | EC               | CORP              | CA        |     49846 | NS      | $2611431.94   | 2.34%             |  |  |  | No            |                  1 | On Loan: No      |
| Brown & Brown Inc                          | Brown & Brown, Inc.                                        | CUSIP: 115236101<br>LEI: 549300PC8KTJ71XKFY89 | Long             | EC               | CORP              | US        |     55656 | NS      | $4435783.20   | 3.98%             |  |  |  | No            |                  1 | On Loan: No      |
| CDW Corp/DE                                | CDW Corp.                                                  | CUSIP: 12514G108<br>LEI: 9845001B052ABF0B6755 | Long             | EC               | CORP              | US        |     26395 | NS      | $3594999.00   | 3.23%             |  |  |  | No            |                  1 | On Loan: No      |
| Carlisle Cos Inc                           | Carlisle Cos., Inc.                                        | CUSIP: 142339100<br>LEI: XR64VGX1ZPX6G7ZN7Z11 | Long             | EC               | CORP              | US        |     13038 | NS      | $4170334.68   | 3.74%             |  |  |  | No            |                  1 | On Loan: No      |
| Copart Inc                                 | Copart, Inc.                                               | CUSIP: 217204106<br>LEI: 549300KVYX3JWMYEHU61 | Long             | EC               | CORP              | US        |     85026 | NS      | $3328767.90   | 2.99%             |  |  |  | No            |                  1 | On Loan: No      |
| Cullen/Frost Bankers Inc                   | Cullen/Frost Bankers, Inc.                                 | CUSIP: 229899109<br>LEI: 529900V2E9G9AY665O34 | Long             | EC               | CORP              | US        |      9934 | NS      | $1257942.42   | 1.13%             |  |  |  | No            |                  1 | On Loan: No      |
| Expeditors International of Washington Inc | Expeditors International of Washington, Inc.               | CUSIP: 302130109<br>LEI: 984500B055A804AB6E40 | Long             | EC               | CORP              | US        |     14001 | NS      | $2086289.01   | 1.87%             |  |  |  | No            |                  1 | On Loan: No      |
| Floor & Decor Holdings Inc                 | Floor & Decor Holdings, Inc.                               | CUSIP: 339750101<br>LEI: 549300M5FR3N688XGQ36 | Long             | EC               | CORP              | US        |     43724 | NS      | $2662354.36   | 2.39%             |  |  |  | No            |                  1 | On Loan: No      |
| Gartner Inc                                | Gartner, Inc.                                              | CUSIP: 366651107<br>LEI: PP55B5R38BFB8O8HH686 | Long             | EC               | CORP              | US        |     14395 | NS      | $3631570.60   | 3.26%             |  |  |  | No            |                  1 | On Loan: No      |
| Glacier Bancorp Inc                        | Glacier Bancorp, Inc.                                      | CUSIP: 37637Q105<br>LEI: 549300SMJAUKZB5D7V74 | Long             | EC               | CORP              | US        |     27133 | NS      | $1195208.65   | 1.07%             |  |  |  | No            |                  1 | On Loan: No      |
| Graco Inc                                  | Graco, Inc.                                                | CUSIP: 384109104<br>LEI: 4T5VJ4S81BRT6Q7GGT78 | Long             | EC               | CORP              | US        |     13048 | NS      | $1069544.56   | 0.96%             |  |  |  | No            |                  1 | On Loan: No      |
| Kinsale Capital Group Inc                  | Kinsale Capital Group, Inc.                                | CUSIP: 49714P108<br>LEI: 529900QTUQHNZ6HOA508 | Long             | EC               | CORP              | US        |      4274 | NS      | $1671646.88   | 1.50%             |  |  |  | No            |                  1 | On Loan: No      |
| Labcorp Holdings Inc                       | Labcorp Holdings, Inc.                                     | CUSIP: 504922105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     14420 | NS      | $3617689.60   | 3.25%             |  |  |  | No            |                  1 | On Loan: No      |
| Liberty Broadband Corp                     | Liberty Broadband Corp.                                    | CUSIP: 530307305<br>LEI: 549300MIX43II8JLN536 | Long             | EC               | CORP              | US        |     35626 | NS      | $1731423.60   | 1.55%             |  |  |  | No            |                  1 | On Loan: No      |
| Liberty Media Corp-Liberty Formula One     | Liberty Media Corp.-Liberty Formula One                    | CUSIP: 531229755<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     36253 | NS      | $3571283.03   | 3.21%             |  |  |  | No            |                  1 | On Loan: No      |
| Lithia Motors Inc                          | Lithia Motors, Inc.                                        | CUSIP: 536797103<br>LEI: SE8N1EZEHPZQBCBVKD53 | Long             | EC               | CORP              | US        |      7457 | NS      | $2478184.81   | 2.22%             |  |  |  | No            |                  1 | On Loan: No      |
| MKS Inc                                    | MKS, Inc.                                                  | CUSIP: 55306N104<br>LEI: 549300KEQATBHAGVF505 | Long             | EC               | CORP              | US        |     25640 | NS      | $4097272.00   | 3.68%             |  |  |  | No            |                  1 | On Loan: No      |
| MSA Safety Inc                             | MSA Safety, Inc.                                           | CUSIP: 553498106<br>LEI: 529900DVA3258XK11O39 | Long             | EC               | CORP              | US        |     17490 | NS      | $2800848.60   | 2.51%             |  |  |  | No            |                  1 | On Loan: No      |
| Medpace Holdings Inc                       | Medpace Holdings, Inc.                                     | CUSIP: 58506Q109<br>LEI: 549300H8TYEUVTW14A54 | Long             | EC               | CORP              | US        |      7620 | NS      | $4279773.00   | 3.84%             |  |  |  | No            |                  1 | On Loan: No      |
| Moelis & Co                                | Moelis & Co.                                               | CUSIP: 60786M105<br>LEI: 549300891QNU7VTQUR83 | Long             | EC               | CORP              | US        |     31915 | NS      | $2193837.10   | 1.97%             |  |  |  | No            |                  1 | On Loan: No      |
| PACCAR Inc                                 | PACCAR, Inc.                                               | CUSIP: 693718108<br>LEI: KDTEY8BWE486IKZ3CC07 | Long             | EC               | CORP              | US        |     42931 | NS      | $4701373.81   | 4.22%             |  |  |  | No            |                  1 | On Loan: No      |
| Ross Stores Inc                            | Ross Stores, Inc.                                          | CUSIP: 778296103<br>LEI: 549300ENZFLPGRDFZQ60 | Long             | EC               | CORP              | US        |     41643 | NS      | $7501570.02   | 6.73%             |  |  |  | No            |                  1 | On Loan: No      |
| ServiceTitan Inc                           | ServiceTitan, Inc.                                         | CUSIP: 81764X103<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     17859 | NS      | $1901983.50   | 1.71%             |  |  |  | No            |                  1 | On Loan: No      |
| A O Smith Corp                             | A.O. Smith Corp.                                           | CUSIP: 831865209<br>LEI: 549300XG4US7UJNECY36 | Long             | EC               | CORP              | US        |     33998 | NS      | $2273786.24   | 2.04%             |  |  |  | No            |                  1 | On Loan: No      |
| Teledyne Technologies Inc                  | Teledyne Technologies, Inc.                                | CUSIP: 879360105<br>LEI: 549300VSMO9KYQWDND94 | Long             | EC               | CORP              | US        |      5839 | NS      | $2982152.47   | 2.68%             |  |  |  | No            |                  1 | On Loan: No      |
| Thor Industries Inc                        | Thor Industries, Inc.                                      | CUSIP: 885160101<br>LEI: 254900XZO1228PDSG060 | Long             | EC               | CORP              | US        |     28965 | NS      | $2973836.55   | 2.67%             |  |  |  | No            |                  1 | On Loan: No      |
| Waters Corp                                | Waters Corp.                                               | CUSIP: 941848103<br>LEI: 5T547R1474YC9HOD8Q74 | Long             | EC               | CORP              | US        |      8099 | NS      | $3076243.17   | 2.76%             |  |  |  | No            |                  1 | On Loan: No      |
| State Street Global Advisors               | State Street Institutional US Government Money Market Fund | CUSIP: 857492706<br>LEI: 549300BZ5TGIFZUZDZ37 | Long             | STIV             | RF                | US        |   6483353 | NS      | $6483353.19   | 5.82%             |  |  |  | No            |                  1 | On Loan: No      |
| Arch Capital Group Ltd                     | Arch Capital Group Ltd.                                    | CUSIP: 000000000<br>LEI: 549300AYR4P8AFKDCE43 | Long             | EC               | CORP              | BM        |     88813 | NS      | $8518942.96   | 7.65%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2026-01-16

**Name of Applicant:** ULTRA SERIES FUND

**Signature:** Greg Hoppe

**Name of Signer:** Greg Hoppe

**Title:** Chief Financial Officer