# EDGAR Filing Document

**Accession Number:** 0000002110
**File Stem:** 0001410368-26-018835
**Filing Date:** 2026-2
**Character Count:** 9472
**Document Hash:** 6c0e8404318a9d0a01fdfd68bc7f9bb3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-018835.hdr.sgml**: 20260226

**ACCESSION NUMBER**: 0001410368-26-018835

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260226

**DATE AS OF CHANGE**: 20260226

**PERIOD START**: 20251231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COLUMBIA ACORN TRUST
- **CENTRAL INDEX KEY:** 0000002110

**ORGANIZATION NAME:**
- **EIN:** 362692100
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-01829
- **FILM NUMBER:** 26684803

**BUSINESS ADDRESS:**
- **STREET 1:** 71 S. WACKER DRIVE, SUITE 2500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3126349200

**MAIL ADDRESS:**
- **STREET 1:** 71 S. WACKER DRIVE, SUITE 2500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LIBERTY ACORN TRUST
- **DATE OF NAME CHANGE:** 20010424

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ACORN INVESTMENT TRUST
- **DATE OF NAME CHANGE:** 19940204

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

## Series and Classes Contracts Data

### Columbia Thermostat Fund (Series ID: S000009189)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000024974 | Columbia Thermostat Fund Class A               | CTFAX           |
| C000024976 | Columbia Thermostat Fund Class C               | CTFDX           |
| C000024977 | Columbia Thermostat Fund Institutional Class   | COTZX           |
| C000122750 | Columbia Thermostat Fund Institutional 2 Class | CQTRX           |
| C000122751 | Columbia Thermostat Fund Institutional 3 Class | CYYYX           |
| C000251062 | Columbia Thermostat Class S                    | COTDX           |

## Form NPORT-P: Monthly Portfolio Investments Report

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

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

- **a. Name of Registrant:** COLUMBIA ACORN TRUST

- **b. Investment Company Act file number:** 811-01829

- **c. CIK number of Registrant:** 0000002110

- **d. LEI of Registrant:** 549300DX0CWIN8VE1908

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

  - **Street Address 1:** 290 Congress Street

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02210

  - **Telephone number:** 800-345-6611

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

- **a. Name of Series:** Columbia Thermostat Fund

- **b. EDGAR series identifier (if any):** S000009189

- **c. LEI of Series:** 549300EN4NJA2NPKY702

**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:** $1297199540.28

**Total Liabilities:** $684685.48

**Net Assets:** $1296514854.80

**Currency Risk Metrics (dv01):**

- 

**Credit Spread Risk - Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Credit Spread Risk - Non-Investment Grade (dv01):**

- **3-Month:** 347730.76000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 135.03000000

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000024974 | 1.04%                | 0.38%                | 0.02%                |
| Class ID C000024976 | 0.98%                | 0.32%                | -0.09%               |
| Class ID C000024977 | 1.06%                | 0.39%                | 0.03%                |
| Class ID C000122750 | 1.05%                | 0.44%                | 0.02%                |
| Class ID C000122751 | 1.05%                | 0.38%                | 0.06%                |
| Class ID C000251062 | 1.06%                | 0.39%                | 0.03%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $18473815.23             | $-8091761.73                               |
| Month 2  | $72661.08                | $1297530.95                                |
| Month 3  | $20985850.17             | $-28662695.48                              |

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| COLUMBIA DIVERSIFIED FIXED INCOME ALLOCATION ETF | COLUMBIA DIVERSIFIED FIXED INCOME ALLOCATION ETF | CUSIP: 19761L508<br>LEI: 5493000XJTC3ZADRR062 | Long             | EC               | RF                | US        |   4887459 | NS      | $89709309.95  | 6.92%             |  |  |  | No            |                  1 | On Loan: No      |
| COLUMBIA RESEARCH ENHANCED CORE ETF              | COLUMBIA RESEARCH ENHANCED CORE ETF              | CUSIP: 19761L706<br>LEI: 5493007QSD2LFRRLVI83 | Long             | EC               | RF                | US        |   1899723 | NS      | $77584687.32  | 5.98%             |  |  |  | No            |                  1 | On Loan: No      |
| COLUMBIA LARGE CAP ENHANCED CORE FUND            | COLUMBIA LARGE CAP ENHANCED CORE FUND            | CUSIP: 19765M221<br>LEI: 4NRO1OG1Z3OAV446QS07 | Long             | EC               | RF                | US        |   3429273 | NS      | $97597120.22  | 7.53%             |  |  |  | No            |                  1 | On Loan: No      |
| Columbia Large Cap Growth Fund                   | COLUMBIA CORNERSTONE GROWTH FUND                 | CUSIP: 19765Y365<br>LEI: KG8XSD65WNAI0QHT2D47 | Long             | EC               | RF                | US        |    473526 | NS      | $39255312.61  | 3.03%             |  |  |  | No            |                  1 | On Loan: No      |
| Columbia High Yield Bond Fund                    | Columbia High Yield Bond Fund                    | CUSIP: 19766C495<br>LEI: D0A8CA0QT3K0EUQM7B46 | Long             | EC               | RF                | US        |   8059554 | NS      | $90105815.89  | 6.95%             |  |  |  | No            |                  1 | On Loan: No      |
| COLUMBIA SHORT TERM CASH FUND                    | COLUMBIA SHORT TERM CASH FUND                    | CUSIP: 19766H239<br>LEI: N/A                  | Long             | STIV             | RF                | US        |   6222128 | NS      | $6220261.33   | 0.48%             |  |  |  | No            |                  1 | On Loan: No      |
| Columbia Quality Income Fund                     | COLUMBIA US GOVERNMENT MORTGAGE                  | CUSIP: 19766J581<br>LEI: TJ30X3X4Z9WHP6KG4C22 | Long             | EC               | RF                | US        |   7352254 | NS      | $134325673.29 | 10.36%            |  |  |  | No            |                  1 | On Loan: No      |
| Columbia Contrarian Core Fund                    | COLUMBIA TRUST CONTRARIAN CORE FD                | CUSIP: 19766M709<br>LEI: XDPT7NN16OBIUU173D53 | Long             | EC               | RF                | US        |   2443732 | NS      | $97651520.57  | 7.53%             |  |  |  | No            |                  1 | On Loan: No      |
| COLUMBIA INTERMEDIATE BOND FUND                  | COLUMBIA INTERMEDIATE BOND FUND                  | CUSIP: 19766M758<br>LEI: 7TUF7LZJ7F8AC48WIE77 | Long             | EC               | RF                | US        |   7253482 | NS      | $224422722.28 | 17.31%            |  |  |  | No            |                  1 | On Loan: No      |
| COLUMBIA SELECT CORPORATE INCOME FUND            | COLUMBIA SELECT CORPORATE INCOME FUND            | CUSIP: 19766M873<br>LEI: DERHCGZF5QUGBK32WQ53 | Long             | EC               | RF                | US        |  19384251 | NS      | $179498160.22 | 13.84%            |  |  |  | No            |                  1 | On Loan: No      |
| COLUMBIA FUNDS SERIES TRUST - CO                 | COLUMBIA FUNDS SERIES TRUST - CO                 | CUSIP: 19766P736<br>LEI: ORPPOX410PHMRVFIOW55 | Long             | EC               | RF                | US        |   1500185 | NS      | $77979625.66  | 6.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Columbia US Treasury Index Fund                  | Columbia US Treasury Index Fund                  | CUSIP: 19767A381<br>LEI: Z3NLJ4CB2CLTOYV0LQ23 | Long             | EC               | RF                | US        |  17863608 | NS      | $179350622.32 | 13.83%            |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2026-02-02

**Name of Applicant:** COLUMBIA ACORN TRUST

**Signature:** Jennifer Borges

**Name of Signer:** Jennifer Borges

**Title:** Senior Manager