# EDGAR Filing Document

**Accession Number:** 0000798244
**File Stem:** 0001752724-25-177373
**Filing Date:** 2025-7
**Character Count:** 73756
**Document Hash:** ef2c4e13c7fa88e06904fbc5096d94fa
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-25-177373.hdr.sgml**: 20250725

**ACCESSION NUMBER**: 0001752724-25-177373

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 4

**CONFORMED PERIOD OF REPORT**: 20250531

**FILED AS OF DATE**: 20250725

**DATE AS OF CHANGE**: 20250725

**PERIOD START**: 20250831

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST I
- **CENTRAL INDEX KEY:** 0000798244

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04777
- **FILM NUMBER:** 251148683

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 18006372929

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS SERIES TRUST I /MA/
- **DATE OF NAME CHANGE:** 19940427

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS LIFETIME MANAGED SECTORS FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LIFETIME MANAGED SECTORS TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### MFS New Discovery Fund (Series ID: S000000765)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000002210 | A            | MNDAX           |
| C000002211 | R4           | MNDJX           |
| C000002215 | B            | MNDBX           |
| C000002216 | C            | MNDCX           |
| C000002217 | I            | MNDIX           |
| C000002219 | R1           | MNDGX           |
| C000002221 | R2           | MNDRX           |
| C000002222 | R3           | MNDHX           |
| C000075013 | R6           | MNDKX           |

## Nport-Ex

![](img51b6f2fa1.gif)

### Quarterly Report
May 31, 2025

MFS<sup>®</sup> New Discovery Fund

![](img2e5afa932.gif)

NDF-Q3

------

### Portfolio of Investments
5/31/25 (unaudited)

The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by broad-based asset classes.

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – 95.6% | Common Stocks – 95.6% | Common Stocks – 95.6% |
| Aerospace & Defense – 4.1% | Aerospace & Defense – 4.1% |  |
| Amentum Holdings, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4875 | $100714 |
| CACI International, Inc., "A" (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;63123 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;27016644 |
| Karman Holdings, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;257742 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11046822 |
| KBR, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;331657 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17309179 |
| Mirion Technologies, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;625471 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11946496 |
| Standard Aero, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;511687 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15007780 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$82427635 |
| Apparel Manufacturers – 0.7% | Apparel Manufacturers – 0.7% |  |
| Columbia Sportswear Co. | &nbsp;&nbsp;&nbsp;&nbsp;217750 | $13888095 |
| Automotive – 3.4% | Automotive – 3.4% |  |
| ACV Auctions, Inc. (a) | &nbsp;&nbsp;1425066 | $23342581 |
| Modine Manufacturing Co. (a) | &nbsp;&nbsp;&nbsp;&nbsp;219580 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19937864 |
| Visteon Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;278527 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;23514642 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$66795087 |
| Biotechnology – 3.2% | Biotechnology – 3.2% |  |
| ABSCI Corp. (a)(l) | &nbsp;&nbsp;1497169 | $3967498 |
| Adaptive Biotechnologies Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;967435 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9209981 |
| Blueprint Medicines Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;194742 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19737102 |
| CG Oncology, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;171101 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4383607 |
| Exact Sciences Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;268478 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15109942 |
| Immunocore Holdings PLC, ADR (a) | &nbsp;&nbsp;&nbsp;&nbsp;304295 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11137197 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$63545327 |
| Brokerage & Asset Managers – 5.0% | Brokerage & Asset Managers – 5.0% |  |
| GCM Grosvenor, Inc., "A" | &nbsp;&nbsp;1367850 | $17248588 |
| P10, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;853310 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9266947 |
| PJT Partners, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;120154 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18102402 |
| StepStone Group, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;561990 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;32511121 |
| WisdomTree Investments, Inc. | &nbsp;&nbsp;2441898 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;23051517 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$100180575 |
| Business Services – 2.8% | Business Services – 2.8% |  |
| ExlService Holdings, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;476930 | $21934011 |
| Remitly Global, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;485342 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10366905 |
| TriNet Group, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;183930 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15304815 |
| UL Solutions, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;115695 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8272193 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$55877924 |
| Chemicals – 0.7% | Chemicals – 0.7% |  |
| BioLife Solutions, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;626221 | $13701715 |
| Computer Software – 10.7% | Computer Software – 10.7% |  |
| Alkami Technology, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;927606 | $26566636 |
| CCC Intelligent Holdings, Inc. (a) | &nbsp;&nbsp;2917191 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;25612937 |
| Elastic N.V. (a) | &nbsp;&nbsp;&nbsp;&nbsp;244722 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19790668 |
| Guidewire Software, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;77533 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16671146 |
| JFrog Ltd. (a) | &nbsp;&nbsp;&nbsp;&nbsp;724792 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;31122569 |
| Kinaxis, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;140376 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19990295 |
| OneStream, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;720601 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;20220064 |
| Pegasystems, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;275843 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;27073990 |
| SentinelOne, Inc., "A" (a) | &nbsp;&nbsp;1010501 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17794923 |
| ServiceTitan, Inc., "A" (a)(l) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;82369 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9115777 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$213959005 |

---

------

Portfolio of Investments (unaudited) – continued

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – continued | Common Stocks – continued | Common Stocks – continued |
| Computer Software - Systems – 1.2% | Computer Software - Systems – 1.2% |  |
| Q2 Holdings, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;281024 | $24595220 |
| Construction – 5.6% | Construction – 5.6% |  |
| AZEK Co., Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;204692 | $10134301 |
| Independence Realty Trust, Inc., REIT | &nbsp;&nbsp;1297221 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;24115338 |
| James Hardie Industries PLC (a)(l) | &nbsp;&nbsp;&nbsp;&nbsp;604647 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14088275 |
| Knife River Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;373115 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;35110122 |
| QXO, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;410492 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6978364 |
| QXO, Inc. (PIPE) (a) | &nbsp;&nbsp;1260033 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21420561 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$111846961 |
| Consumer Products – 1.4% | Consumer Products – 1.4% |  |
| e.l.f. Beauty, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;149386 | $16804431 |
| ODDITY Tech Ltd. (a) | &nbsp;&nbsp;&nbsp;&nbsp;159695 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11886099 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$28690530 |
| Containers – 1.1% | Containers – 1.1% |  |
| AptarGroup Inc. | &nbsp;&nbsp;&nbsp;&nbsp;141112 | $22352141 |
| Electrical Equipment – 2.9% | Electrical Equipment – 2.9% |  |
| Littlefuse, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;92409 | $18949390 |
| nVent Electric PLC | &nbsp;&nbsp;&nbsp;&nbsp;591654 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;38930833 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$57880223 |
| Electronics – 3.7% | Electronics – 3.7% |  |
| Advanced Energy Industries, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;231383 | $26558141 |
| Allegro MicroSystems, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;398210 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10094623 |
| Formfactor, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;709526 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21179351 |
| Onto Innovation, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;171251 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15744817 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$73576932 |
| Energy - Independent – 2.3% | Energy - Independent – 2.3% |  |
| Antero Resources Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;301312 | $11284134 |
| Matador Resources Co. | &nbsp;&nbsp;&nbsp;&nbsp;270388 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11629388 |
| Permian Resources Corp. | &nbsp;&nbsp;&nbsp;&nbsp;898141 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11325558 |
| Viper Energy, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;282118 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11197264 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$45436344 |
| Energy - Renewables – 0.4% | Energy - Renewables – 0.4% |  |
| Bloom Energy Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;464516 | $8579611 |
| Engineering - Construction – 1.8% | Engineering - Construction – 1.8% |  |
| Jacobs Solutions, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;80132 | $10120672 |
| TopBuild Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;93499 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;26449932 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$36570604 |
| Gaming & Lodging – 2.5% | Gaming & Lodging – 2.5% |  |
| Genius Sports Ltd. (a) | &nbsp;&nbsp;3513331 | $33692844 |
| Sportradar Group AG (a) | &nbsp;&nbsp;&nbsp;&nbsp;682025 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16307218 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$50000062 |
| General Merchandise – 1.0% | General Merchandise – 1.0% |  |
| Ollie's Bargain Outlet Holdings, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;168028 | $18726721 |
| Internet – 0.3% | Internet – 0.3% |  |
| Etoro Group Ltd. (a) | &nbsp;&nbsp;&nbsp;&nbsp;113826 | $6738499 |

---

------

Portfolio of Investments (unaudited) – continued

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – continued | Common Stocks – continued | Common Stocks – continued |
| Leisure & Toys – 1.4% | Leisure & Toys – 1.4% |  |
| Brunswick Corp. | &nbsp;&nbsp;&nbsp;&nbsp;305660 | $15472509 |
| Corsair Gaming, Inc. (a) | &nbsp;&nbsp;1363977 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11989358 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$27461867 |
| Machinery & Tools – 5.8% | Machinery & Tools – 5.8% |  |
| Albany International Corp. | &nbsp;&nbsp;&nbsp;&nbsp;181484 | $11990648 |
| Crane Co. | &nbsp;&nbsp;&nbsp;&nbsp;214473 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;36760672 |
| Flowserve Corp. | &nbsp;&nbsp;&nbsp;&nbsp;694459 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;34660449 |
| RB Global, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;313188 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;32978696 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$116390465 |
| Medical & Health Technology & Services – 4.1% | Medical & Health Technology & Services – 4.1% |  |
| Certara, Inc. (a) | &nbsp;&nbsp;1085609 | $12332518 |
| GeneDX Holdings Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;139071 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9904637 |
| Guardant Health, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;206759 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8398551 |
| HealthEquity, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;198725 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19993722 |
| Schrodinger, Inc. (a) | &nbsp;&nbsp;1119750 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;24208995 |
| Tempus AI, Inc. (a)(l) | &nbsp;&nbsp;&nbsp;&nbsp;117179 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6465937 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$81304360 |
| Medical Equipment – 10.6% | Medical Equipment – 10.6% |  |
| Align Technology, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;111853 | $20238682 |
| Bio-Techne Corp. | &nbsp;&nbsp;&nbsp;&nbsp;519015 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;25120326 |
| Ceribell, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;376698 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6332293 |
| Fractyl Health, Inc. (a)(l) | &nbsp;&nbsp;&nbsp;&nbsp;639147 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1214379 |
| Gerresheimer AG | &nbsp;&nbsp;&nbsp;&nbsp;187914 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13516798 |
| Globus Medical, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;545313 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;32271623 |
| iRhythm Technologies, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;57282 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8048121 |
| Lantheus Holdings, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;202567 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15305963 |
| Masimo Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;91575 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14880937 |
| Metsera, Inc. (a)(l) | &nbsp;&nbsp;&nbsp;&nbsp;171681 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4587316 |
| Outset Medical, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;430594 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7565537 |
| PROCEPT BioRobotics Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;138369 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8025402 |
| QIAGEN N.V. | &nbsp;&nbsp;&nbsp;&nbsp;687391 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;31021956 |
| UFP Technologies, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;101803 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;23842263 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$211971596 |
| Oil Services – 0.9% | Oil Services – 0.9% |  |
| TechnipFMC PLC | &nbsp;&nbsp;&nbsp;&nbsp;600043 | $18691339 |
| Pharmaceuticals – 7.4% | Pharmaceuticals – 7.4% |  |
| Amicus Therapeutics, Inc. (a) | &nbsp;&nbsp;2443065 | $14829405 |
| Annexon, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;668226 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1363181 |
| Ascendis Pharma, ADR (a) | &nbsp;&nbsp;&nbsp;&nbsp;109771 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17875110 |
| Collegium Pharmaceutical, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;538945 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15704857 |
| Cytokinetics, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;234124 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7262526 |
| Harmony Biosciences Holdings (a) | &nbsp;&nbsp;&nbsp;&nbsp;437271 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15085850 |
| Ionis Pharmaceuticals, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;351794 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11788617 |
| Kymera Therapeutics, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;305374 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9051285 |
| Legend Biotech Corp., ADR (a) | &nbsp;&nbsp;&nbsp;&nbsp;275333 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7970890 |
| Ligand Pharmaceuticals, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;210832 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21544922 |
| Neurocrine Biosciences, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;116640 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14349053 |
| Ultragenyx Pharmaceutical, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;317856 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10816640 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$147642336 |
| Pollution Control – 1.1% | Pollution Control – 1.1% |  |
| GFL Environmental, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;422148 | $21288924 |

---

------

Portfolio of Investments (unaudited) – continued

---

| | | |
|:---|:---|:---|
| **Issuer** | **Shares/Par** | &nbsp;&nbsp;&nbsp;**Value ($)** |
| Common Stocks – continued | Common Stocks – continued | Common Stocks – continued |
| Real Estate – 0.8% | Real Estate – 0.8% |  |
| DigitalBridge Group, Inc., REIT | &nbsp;&nbsp;1448634 | $16021892 |
| Real Estate - Storage – 2.1% | Real Estate - Storage – 2.1% |  |
| STAG Industrial, Inc., REIT | &nbsp;&nbsp;&nbsp;&nbsp;405267 | $14419400 |
| Terreno Realty Corp., REIT | &nbsp;&nbsp;&nbsp;&nbsp;494129 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;27878758 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$42298158 |
| Restaurants – 4.4% | Restaurants – 4.4% |  |
| Chefs' Warehouse, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;304718 | $19434914 |
| U.S. Foods Holding Corp. (a) | &nbsp;&nbsp;&nbsp;&nbsp;447073 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;35372416 |
| Wingstop, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;95688 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;32696589 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$87503919 |
| Specialty Chemicals – 0.4% | Specialty Chemicals – 0.4% |  |
| Axalta Coating Systems Ltd. (a) | &nbsp;&nbsp;&nbsp;&nbsp;229494 | $7068415 |
| Trucking – 1.8% | Trucking – 1.8% |  |
| Knight-Swift Transportation Holdings, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;409211 | $18136231 |
| XPO, Inc. (a) | &nbsp;&nbsp;&nbsp;&nbsp;146513 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16677575 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$34813806 |
| **Total Common Stocks** |  | &nbsp;&nbsp;**$1907826288** |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Strike<br> Price** | &nbsp;&nbsp;**First<br> Exercise** |  |  |
| Warrants – 0.0% |  |  |  |  |
| Medical Equipment – 0.0% | Medical Equipment – 0.0% | Medical Equipment – 0.0% | Medical Equipment – 0.0% | Medical Equipment – 0.0% |
| OptiNose, Inc. (1 share for 15 warrants, Expiration 11/23/27) (a) | $2.565 | &nbsp;&nbsp;11/23/22 | 627544 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0 |

---

---

| | | |
|:---|:---|:---|
| Mutual Funds (h) – 3.4% | Mutual Funds (h) – 3.4% | Mutual Funds (h) – 3.4% |
| Money Market Funds – 3.4% | Money Market Funds – 3.4% |  |
| MFS Institutional Money Market Portfolio, 4.35% (v) | 68957248 | &nbsp;&nbsp;&nbsp;$68957249 |
| Collateral for Securities Loaned – 1.7% | Collateral for Securities Loaned – 1.7% | Collateral for Securities Loaned – 1.7% |
| JPMorgan U.S. Government Money Market Fund - Class IM Shares, 4.25% (j) | 34237275 | &nbsp;&nbsp;&nbsp;$34237275 |
| Other Assets, Less Liabilities – (0.7)% |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(14908554) |
| **Net Assets – 100.0%** | **Net Assets – 100.0%** | &nbsp;&nbsp;&nbsp;**$1996112258** |

---

(a) Non-income producing security.

(h) An affiliated issuer, which may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. At period end,
the aggregate values of the fund's investments in affiliated issuers and in unaffiliated issuers were $68,957,249 and $1,942,063,563, respectively.

(j) The rate quoted is the annualized seven-day yield of the fund at period end.

(l) A portion of this security is on loan.

(v) Affiliated issuer that is available only to investment companies managed by MFS. The rate quoted for the MFS Institutional Money Market Portfolio is the annualized
seven-day yield of the fund at period end.

---

| | |
|:---|:---|
| The following abbreviations are used in this report and are defined: | The following abbreviations are used in this report and are defined: |
| ADR | American Depositary Receipt |
| PIPE | Private Investment in Public Equity |
| REIT | Real Estate Investment Trust |

---

See attached supplemental information. For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.

------

### Supplemental Information
5/31/25 (unaudited)

The fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946 Financial Services - Investment Companies.

(1) Investment Valuations

Subject to its oversight, the fund's Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund's investments to MFS as the fund's adviser, pursuant to the fund's valuation policy and procedures which have been adopted by the adviser and approved by the Board. In accordance with Rule 2a-5 under the Investment Company Act of 1940, the Board of Trustees designated the adviser as the "valuation designee" of the fund. If the adviser, as valuation designee, determines that reliable market quotations are not readily available for an investment, the investment is valued at fair value as determined in good faith by the adviser in accordance with the adviser's fair valuation policy and procedures.

Under the fund's valuation policy and procedures, equity securities, including restricted equity securities, are generally valued at the last sale or official closing price on their primary market or exchange as provided by a third-party pricing service. Equity securities, for which there were no sales reported that day, are generally valued at the last quoted daily bid quotation on their primary market or exchange as provided by a third-party pricing service. Short-term instruments with a maturity at issuance of 60 days or less may be valued at amortized cost, which approximates market value. Open-end investment companies are generally valued at net asset value per share. The values of foreign securities and other assets and liabilities expressed in foreign currencies are converted to U.S. dollars using the mean of bid and asked prices for rates provided by a third-party pricing service.

Under the fund's valuation policy and procedures, market quotations are not considered to be readily available for debt instruments, floating rate loans, and many types of derivatives. These investments are generally valued at fair value based on information from third-party pricing services or otherwise determined by the adviser in accordance with the adviser's fair valuation policy and procedures. Securities and other assets generally valued on the basis of information from a third-party pricing service may also be valued at a broker/dealer bid quotation. In determining values, third-party pricing services can utilize both transaction data and market information such as yield, quality, coupon rate, maturity, type of issue, trading characteristics, spreads and other market data. An investment may also be valued at fair value if the adviser determines that the investment's value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (such as foreign exchange or market) and prior to the determination of the fund's net asset value, or after the halt of trading of a specific security where trading does not resume prior to the close of the exchange or market on which the security is principally traded. Events that occur after foreign markets close (such as developments in foreign markets and significant movements in the U.S. markets) and prior to the determination of the fund's net asset value may be deemed to have a material effect on the value of securities traded in foreign markets. Accordingly, the fund's foreign equity securities may often be valued at fair value. The adviser generally relies on third-party pricing services or other information (such as the correlation with price movements of similar securities in the same or other markets; the type, cost and investment characteristics of the security; the business and financial condition of the issuer; and trading and other market data) to assist in determining whether to fair value and at what value to fair value an investment. The value of an investment for purposes of calculating the fund's net asset value can differ depending on the source and method used to determine value. When fair valuation is used, the value of an investment used to determine the fund's net asset value may differ from quoted or published prices for the same investment. There can be no assurance that the fund could obtain the fair value assigned to an investment if it were to sell the investment at the same time at which the fund determines its net asset value per share.

Various inputs are used in determining the value of the fund's assets or liabilities. These inputs are categorized into three broad levels. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The fund's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the investment. Level 1 includes unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 includes other

------

Supplemental Information (unaudited) – continued

significant observable market-based inputs (including quoted prices for similar securities, interest rates, prepayment speed, and credit risk). Level 3 includes significant unobservable inputs, which may include the adviser's own assumptions in determining the fair value of investments. The following is a summary of the levels used as of May 31, 2025 in valuing the fund's assets and liabilities:

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Financial Instruments** | &nbsp;&nbsp;&nbsp;**Level 1** | &nbsp;&nbsp;&nbsp;**Level 2** | &nbsp;&nbsp;&nbsp;**Level 3** | &nbsp;&nbsp;&nbsp;**Total** |
| Equity Securities: |  |  |  |  |
| &nbsp;&nbsp;&nbsp;United States | &nbsp;&nbsp;&nbsp;$1647912926 | &nbsp;&nbsp;&nbsp;$21420561 | &nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;$1669333487 |
| &nbsp;&nbsp;&nbsp;Canada | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;74257915 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;74257915 |
| &nbsp;&nbsp;&nbsp;United Kingdom | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;44830041 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;44830041 |
| &nbsp;&nbsp;&nbsp;Germany | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;44538754 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;44538754 |
| &nbsp;&nbsp;&nbsp;Israel | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18624598 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18624598 |
| &nbsp;&nbsp;&nbsp;Denmark | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17875110 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17875110 |
| &nbsp;&nbsp;&nbsp;Switzerland | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16307218 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16307218 |
| &nbsp;&nbsp;&nbsp;Australia | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14088275 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14088275 |
| &nbsp;&nbsp;&nbsp;China | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7970890 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7970890 |
| Investment Companies | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;103194524 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;103194524 |
| Total | &nbsp;&nbsp;&nbsp;$1989600251 | &nbsp;&nbsp;&nbsp;$21420561 | &nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;$2011020812 |

---

For further information regarding security characteristics, see the Portfolio of Investments.

(2) Investments in Affiliated Issuers

An affiliated issuer may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. For the purposes of this report, the following were affiliated issuers for the period ended May 31, 2025:

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| **Affiliated Issuers** | &nbsp;&nbsp;**Beginning<br> Value** | &nbsp;&nbsp;**Purchases** | &nbsp;&nbsp;**Sales<br> Proceeds** | &nbsp;&nbsp;**Realized<br> Gain<br> (Loss)** | &nbsp;&nbsp;**Change in<br> Unrealized<br> Appreciation or<br> Depreciation** | &nbsp;&nbsp;**Ending<br> Value** |
| MFS Institutional Money Market Portfolio | &nbsp;&nbsp;$73609649 | &nbsp;&nbsp;$528611049 | &nbsp;&nbsp;$533232337 | &nbsp;&nbsp;$(8077) | &nbsp;&nbsp;$(23035) | &nbsp;&nbsp;$68957249 |

---

---

| | | |
|:---|:---|:---|
| **Affiliated Issuers** | &nbsp;&nbsp;**Dividend<br> Income** | &nbsp;&nbsp;**Capital Gain<br> Distributions** |
| MFS Institutional Money Market Portfolio | &nbsp;&nbsp;$2476257 | &nbsp;&nbsp;$— |

---

## Form NPORT-P: Monthly Portfolio Investments Report

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

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

- **a. Name of Registrant:** MFS SERIES TRUST I

- **b. Investment Company Act file number:** 811-04777

- **c. CIK number of Registrant:** 0000798244

- **d. LEI of Registrant:** 549300QRB5FQ35HH3533

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

  - **Street Address 1:** 111 HUNTINGTON AVENUE

  - **City:** BOSTON

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02199

  - **Telephone number:** 617-954-5000

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

- **a. Name of Series:** MFS New Discovery Fund

- **b. EDGAR series identifier (if any):** S000000765

- **c. LEI of Series:** ZVEMRLDGMDO1D1VDSU87

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

- **a. Date of fiscal year-end:** 2025-08-31

- **b. Date as of which information is reported:** 2025-05-31

**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:** $2033418128.15

**Total Liabilities:** $35293622.39

**Net Assets:** $1998124505.76

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000002221 | -6.52%               | 0.20%                | 5.22%                |
| Class ID C000002222 | -6.50%               | 0.22%                | 5.24%                |
| Class ID C000002217 | -6.50%               | 0.25%                | 5.30%                |
| Class ID C000002219 | -6.58%               | 0.15%                | 5.26%                |
| Class ID C000002215 | -6.60%               | 0.15%                | 5.24%                |
| Class ID C000002216 | -6.57%               | 0.14%                | 5.21%                |
| Class ID C000002210 | -6.56%               | 0.26%                | 5.27%                |
| Class ID C000075013 | -6.48%               | 0.24%                | 5.32%                |
| Class ID C000002211 | -6.51%               | 0.27%                | 5.29%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $5520731.29              | $-140469917.44                             |
| Month 2  | $-3065514.68             | $12130892.74                               |
| Month 3  | $6171284.81              | $96005090.43                               |

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| Ionis Pharmaceuticals Inc                 | Ionis Pharmaceuticals Inc                 | CUSIP: 462222100<br>LEI: 549300SI4ZGLG0BLUZ92 | Long             | EC               | CORP              | US        |    351794 | NS      | $11788616.94  | 0.59%             |  |  |  | No            |                  1 | On Loan: No      |
| UL Solutions Inc                          | UL Solutions Inc                          | CUSIP: 903731107<br>LEI: 549300F7CUV5ESKV9P71 | Long             | EC               | CORP              | US        |    115695 | NS      | $8272192.50   | 0.41%             |  |  |  | No            |                  1 | On Loan: No      |
| Ligand Pharmaceuticals Inc                | Ligand Pharmaceuticals Inc                | CUSIP: 53220K504<br>LEI: 5493008K7TB0IKP37H79 | Long             | EC               | CORP              | US        |    210832 | NS      | $21544922.08  | 1.08%             |  |  |  | No            |                  1 | On Loan: No      |
| Independence Realty Trust Inc             | Independence Realty Trust Inc             | CUSIP: 45378A106<br>LEI: 549300Z3L8NU44NQEB29 | Long             | EC               | CORP              | US        |   1297221 | NS      | $24115338.39  | 1.21%             |  |  |  | No            |                  1 | On Loan: No      |
| Onestream Inc                             | Onestream Inc                             | CUSIP: 68278B107<br>LEI: 254900CRBCHIYDC37W82 | Long             | EC               | CORP              | US        |    720601 | NS      | $20220064.06  | 1.01%             |  |  |  | No            |                  1 | On Loan: No      |
| AZEK Co Inc/The                           | AZEK Co Inc/The                           | CUSIP: 05478C105<br>LEI: 5493002LDDDU1RX46815 | Long             | EC               | CORP              | US        |    204692 | NS      | $10134300.92  | 0.51%             |  |  |  | No            |                  1 | On Loan: No      |
| Absci Corp                                | Absci Corp                                | CUSIP: 00091E109<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1497169 | NS      | $3967497.85   | 0.20%             |  |  |  | No            |                  1 | On Loan: —       |
| Alkami Technology Inc                     | Alkami Technology Inc                     | CUSIP: 01644J108<br>LEI: 254900FCNYU4HNEV9L47 | Long             | EC               | CORP              | US        |    927606 | NS      | $26566635.84  | 1.33%             |  |  |  | No            |                  1 | On Loan: No      |
| Mirion Technologies Inc                   | Mirion Technologies Inc                   | CUSIP: 60471A101<br>LEI: 549300BNTOWVWFNVTJ65 | Long             | EC               | CORP              | US        |    410980 | NS      | $7849718.00   | 0.39%             |  |  |  | No            |                  1 | On Loan: No      |
| P10 Inc                                   | P10 Inc                                   | CUSIP: 69376K106<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    853310 | NS      | $9266946.60   | 0.46%             |  |  |  | No            |                  1 | On Loan: No      |
| Exact Sciences Corp                       | Exact Sciences Corp                       | CUSIP: 30063P105<br>LEI: 549300VM3X1FYD4N9Z14 | Long             | EC               | CORP              | US        |    268478 | NS      | $15109941.84  | 0.76%             |  |  |  | No            |                  1 | On Loan: No      |
| BioLife Solutions Inc                     | BioLife Solutions Inc                     | CUSIP: 09062W204<br>LEI: 549300G2IVCMC2TJDW72 | Long             | EC               | CORP              | US        |    626221 | NS      | $13701715.48  | 0.69%             |  |  |  | No            |                  1 | On Loan: No      |
| UFP Technologies Inc                      | UFP Technologies Inc                      | CUSIP: 902673102<br>LEI: 549300RJ8LY41HS70C91 | Long             | EC               | CORP              | US        |    101803 | NS      | $23842262.60  | 1.19%             |  |  |  | No            |                  1 | On Loan: No      |
| nVent Electric PLC                        | nVent Electric PLC                        | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | IE        |    591654 | NS      | $38930833.20  | 1.95%             |  |  |  | No            |                  1 | On Loan: No      |
| Permian Resources Corp                    | Permian Resources Corp                    | CUSIP: 71424F105<br>LEI: 529900NXUJPOKU7OJ511 | Long             | EC               | CORP              | US        |    898141 | NS      | $11325558.01  | 0.57%             |  |  |  | No            |                  1 | On Loan: No      |
| ExlService Holdings Inc                   | ExlService Holdings Inc                   | CUSIP: 302081104<br>LEI: 81E3DTNF6OSH489ZOV15 | Long             | EC               | CORP              | US        |    476930 | NS      | $21934010.70  | 1.10%             |  |  |  | No            |                  1 | On Loan: No      |
| JFrog Ltd                                 | JFrog Ltd                                 | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | IL        |    724792 | NS      | $31122568.48  | 1.56%             |  |  |  | No            |                  1 | On Loan: No      |
| Ollie's Bargain Outlet Holdings Inc       | Ollie's Bargain Outlet Holdings Inc       | CUSIP: 681116109<br>LEI: 529900YO5DSQCPEFDZ05 | Long             | EC               | CORP              | US        |    168028 | NS      | $18726720.60  | 0.94%             |  |  |  | No            |                  1 | On Loan: No      |
| KBR Inc                                   | KBR Inc                                   | CUSIP: 48242W106<br>LEI: 254900OFQDXZRKRCV808 | Long             | EC               | CORP              | US        |    231657 | NS      | $12090178.83  | 0.61%             |  |  |  | No            |                  1 | On Loan: No      |
| iRhythm Technologies Inc                  | iRhythm Technologies Inc                  | CUSIP: 450056106<br>LEI: 549300FJI72RJGDQS384 | Long             | EC               | CORP              | US        |     57282 | NS      | $8048121.00   | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| US Foods Holding Corp                     | US Foods Holding Corp                     | CUSIP: 912008109<br>LEI: 549300UGOZSO64CFPR97 | Long             | EC               | CORP              | US        |    487453 | NS      | $38567281.36  | 1.93%             |  |  |  | No            |                  1 | On Loan: No      |
| Adaptive Biotechnologies Corp             | Adaptive Biotechnologies Corp             | CUSIP: 00650F109<br>LEI: 549300ZTF7OT1FW66Q96 | Long             | EC               | CORP              | US        |    967435 | NS      | $9209981.20   | 0.46%             |  |  |  | No            |                  1 | On Loan: No      |
| Sportradar Group AG                       | Sportradar Group AG                       | CUSIP: 000000000<br>LEI: 549300H1P33YOAT7Z533 | Long             | EC               | CORP              | CH        |    682025 | NS      | $16307217.75  | 0.82%             |  |  |  | No            |                  1 | On Loan: No      |
| Collegium Pharmaceutical Inc              | Collegium Pharmaceutical Inc              | CUSIP: 19459J104<br>LEI: 54930049FXZMTLW8D496 | Long             | EC               | CORP              | US        |    538945 | NS      | $15704857.30  | 0.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Axalta Coating Systems Ltd                | Axalta Coating Systems Ltd                | CUSIP: 000000000<br>LEI: 529900AGLPA40GV6H619 | Long             | EC               | CORP              | BM        |    229494 | NS      | $7068415.20   | 0.35%             |  |  |  | No            |                  1 | On Loan: No      |
| Advanced Energy Industries Inc            | Advanced Energy Industries Inc            | CUSIP: 007973100<br>LEI: 549300756XI3QLFT2U27 | Long             | EC               | CORP              | US        |    231383 | NS      | $26558140.74  | 1.33%             |  |  |  | No            |                  1 | On Loan: No      |
| Modine Manufacturing Co                   | Modine Manufacturing Co                   | CUSIP: 607828100<br>LEI: Z35SZFYJR8GZZRSIUU09 | Long             | EC               | CORP              | US        |    219580 | NS      | $19937864.00  | 1.00%             |  |  |  | No            |                  1 | On Loan: No      |
| Remitly Global Inc                        | Remitly Global Inc                        | CUSIP: 75960P104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    485342 | NS      | $10366905.12  | 0.52%             |  |  |  | No            |                  1 | On Loan: No      |
| GCM Grosvenor Inc                         | GCM Grosvenor Inc                         | CUSIP: 36831E108<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1367850 | NS      | $17248588.50  | 0.86%             |  |  |  | No            |                  1 | On Loan: No      |
| Ascendis Pharma A/S                       | Ascendis Pharma A/S                       | CUSIP: 04351P101<br>LEI: 549300B66JN3W3J8GH73 | Long             | EC               | CORP              | DK        |    109771 | NS      | $17875109.64  | 0.89%             |  |  |  | No            |                  1 | On Loan: No      |
| Knife River Corp                          | Knife River Corp                          | CUSIP: 498894104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    340734 | NS      | $32063069.40  | 1.60%             |  |  |  | No            |                  1 | On Loan: No      |
| Gerresheimer AG                           | Gerresheimer AG                           | CUSIP: 000000000<br>LEI: 5299006GD4UWSYZOKC28 | Long             | EC               | CORP              | DE        |    187914 | NS      | $13516797.74  | 0.68%             |  |  |  | No            |                  1 | On Loan: No      |
| JP Morgan US Government Money Market Fund | JP Morgan US Government Money Market Fund | CUSIP: 4812C2270<br>LEI: 549300NQ5E5B7ZV4T516 | Long             | STIV             | RF                | US        |  34237275 | NS      | $34237275.00  | 1.71%             |  |  |  | No            |                  1 | On Loan: No      |
| Terreno Realty Corp                       | Terreno Realty Corp                       | CUSIP: 88146M101<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    494129 | NS      | $27878758.18  | 1.40%             |  |  |  | No            |                  1 | On Loan: No      |
| QXO INC(PIPE)144APIPE PRIVATEP            | QXO INC(PIPE)144APIPE PRIVATEP            | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1260033 | NS      | $21420561.00  | 1.07%             |  |  |  | Yes           |                  2 | On Loan: No      |
| Ceribell Inc                              | Ceribell Inc                              | CUSIP: 15678C102<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    376698 | NS      | $6332293.38   | 0.32%             |  |  |  | No            |                  1 | On Loan: No      |
| Genius Sports Ltd                         | Genius Sports Ltd                         | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | GG        |   3513331 | NS      | $33692844.29  | 1.69%             |  |  |  | No            |                  1 | On Loan: No      |
| Pegasystems Inc                           | Pegasystems Inc                           | CUSIP: 705573103<br>LEI: 549300FMCOKPL06FYN26 | Long             | EC               | CORP              | US        |    275843 | NS      | $27073990.45  | 1.35%             |  |  |  | No            |                  1 | On Loan: No      |
| Chefs' Warehouse Inc/The                  | Chefs' Warehouse Inc/The                  | CUSIP: 163086101<br>LEI: 549300JYEDC8C547E980 | Long             | EC               | CORP              | US        |    304718 | NS      | $19434914.04  | 0.97%             |  |  |  | No            |                  1 | On Loan: No      |
| James Hardie Industries PLC               | James Hardie Industries PLC               | CUSIP: 47030M106<br>LEI: 635400NSGXKTVOO7JU45 | Long             | EC               | CORP              | IE        |    604647 | NS      | $14088275.10  | 0.71%             |  |  |  | No            |                  1 | On Loan: —       |
| Align Technology Inc                      | Align Technology Inc                      | CUSIP: 016255101<br>LEI: 549300N5YSE0U3LCP840 | Long             | EC               | CORP              | US        |    111853 | NS      | $20238681.82  | 1.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Standard Aero Inc                         | Standard Aero Inc                         | CUSIP: 85423L103<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    511687 | NS      | $15007779.71  | 0.75%             |  |  |  | No            |                  1 | On Loan: No      |
| OPTINOSE INC                              | OPTINOSE INC                              | CUSIP: 68404V118<br>LEI: 549300CPBME7Z3CYMN16 | N/A              | DE               |  | US        |    627544 | NS      | $0.00         | 0.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Viper Energy Inc                          | Viper Energy Inc                          | CUSIP: 927959106<br>LEI: 5299009LINL232255G03 | Long             | EC               | CORP              | US        |    282118 | NS      | $11197263.42  | 0.56%             |  |  |  | No            |                  1 | On Loan: No      |
| Wingstop Inc                              | Wingstop Inc                              | CUSIP: 974155103<br>LEI: 549300SSH3F8HPIM3Q47 | Long             | EC               | CORP              | US        |     95688 | NS      | $32696589.60  | 1.64%             |  |  |  | No            |                  1 | On Loan: No      |
| Bloom Energy Corp                         | Bloom Energy Corp                         | CUSIP: 093712107<br>LEI: 549300XB5J9BFW5JXV97 | Long             | EC               | CORP              | US        |    464516 | NS      | $8579610.52   | 0.43%             |  |  |  | No            |                  1 | On Loan: No      |
| WisdomTree Inc                            | WisdomTree Inc                            | CUSIP: 97717P104<br>LEI: 549300WIU8IS7UFO7871 | Long             | EC               | CORP              | US        |   2441898 | NS      | $23051517.12  | 1.15%             |  |  |  | No            |                  1 | On Loan: No      |
| ServiceTitan Inc                          | ServiceTitan Inc                          | CUSIP: 81764X103<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     82369 | NS      | $9115777.23   | 0.46%             |  |  |  | No            |                  1 | On Loan: —       |
| Guidewire Software Inc                    | Guidewire Software Inc                    | CUSIP: 40171V100<br>LEI: 549300WXSG0J8IXZCK32 | Long             | EC               | CORP              | US        |     77533 | NS      | $16671145.66  | 0.83%             |  |  |  | No            |                  1 | On Loan: No      |
| Guardant Health Inc                       | Guardant Health Inc                       | CUSIP: 40131M109<br>LEI: 254900M8C3E5VC8BR186 | Long             | EC               | CORP              | US        |    206759 | NS      | $8398550.58   | 0.42%             |  |  |  | No            |                  1 | On Loan: No      |
| Flowserve Corp                            | Flowserve Corp                            | CUSIP: 34354P105<br>LEI: 6Y0GK87T6V7NJKZJVM41 | Long             | EC               | CORP              | US        |    694459 | NS      | $34660448.69  | 1.73%             |  |  |  | No            |                  1 | On Loan: No      |
| Tempus AI Inc                             | Tempus AI Inc                             | CUSIP: 88023B103<br>LEI: 2549009LA0KWRAGQBX50 | Long             | EC               | CORP              | US        |    117179 | NS      | $6465937.22   | 0.32%             |  |  |  | No            |                  1 | On Loan: —       |
| Amentum Holdings Inc                      | Amentum Holdings Inc                      | CUSIP: 023939101<br>LEI: 2549009FJIBLW40CU216 | Long             | EC               | CORP              | US        |      4875 | NS      | $100713.99    | 0.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Brunswick Corp/DE                         | Brunswick Corp/DE                         | CUSIP: 117043109<br>LEI: YM4O38W15AX4YLLQKU27 | Long             | EC               | CORP              | US        |    305660 | NS      | $15472509.20  | 0.77%             |  |  |  | No            |                  1 | On Loan: No      |
| PJT Partners Inc                          | PJT Partners Inc                          | CUSIP: 69343T107<br>LEI: 549300W3WBEQUBKYTN87 | Long             | EC               | CORP              | US        |    120154 | NS      | $18102401.64  | 0.91%             |  |  |  | No            |                  1 | On Loan: No      |
| Kinaxis Inc                               | Kinaxis Inc                               | CUSIP: 49448Q109<br>LEI: 5299009VAZ14K7PFUQ15 | Long             | EC               | CORP              | CA        |    140376 | NS      | $19990295.25  | 1.00%             |  |  |  | No            |                  1 | On Loan: No      |
| GeneDx Holdings Corp                      | GeneDx Holdings Corp                      | CUSIP: 81663L200<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    139071 | NS      | $9904636.62   | 0.50%             |  |  |  | No            |                  1 | On Loan: No      |
| Globus Medical Inc                        | Globus Medical Inc                        | CUSIP: 379577208<br>LEI: 5299003M2P4CIK0RF205 | Long             | EC               | CORP              | US        |    545313 | NS      | $32271623.34  | 1.62%             |  |  |  | No            |                  1 | On Loan: No      |
| Hims & Hers Health Inc                    | Hims & Hers Health Inc                    | CUSIP: 433000106<br>LEI: 254900V041EIVTSB6D58 | Long             | EC               | CORP              | US        |    113832 | NS      | $6438337.92   | 0.32%             |  |  |  | No            |                  1 | On Loan: No      |
| Outset Medical Inc                        | Outset Medical Inc                        | CUSIP: 690145206<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    430594 | NS      | $7565536.58   | 0.38%             |  |  |  | No            |                  1 | On Loan: No      |
| Fractyl Health Inc                        | Fractyl Health Inc                        | CUSIP: 35168W103<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    639147 | NS      | $1214379.30   | 0.06%             |  |  |  | No            |                  1 | On Loan: —       |
| Immunocore Holdings PLC                   | Immunocore Holdings PLC                   | CUSIP: 45258D105<br>LEI: 213800IUE3DFS84BVN18 | Long             | EC               | CORP              | GB        |    304295 | NS      | $11137197.00  | 0.56%             |  |  |  | No            |                  1 | On Loan: No      |
| Knight-Swift Transportation Holdings Inc  | Knight-Swift Transportation Holdings Inc  | CUSIP: 499049104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    409211 | NS      | $18136231.52  | 0.91%             |  |  |  | No            |                  1 | On Loan: No      |
| RB Global Inc                             | RB Global Inc                             | CUSIP: 74935Q107<br>LEI: 5493002H8U24DJXQ4886 | Long             | EC               | CORP              | CA        |    313188 | NS      | $32978696.40  | 1.65%             |  |  |  | No            |                  1 | On Loan: No      |
| AptarGroup Inc                            | AptarGroup Inc                            | CUSIP: 038336103<br>LEI: VNPEQDQFAA7IY1T2PX43 | Long             | EC               | CORP              | US        |    141112 | NS      | $22352140.80  | 1.12%             |  |  |  | No            |                  1 | On Loan: No      |
| Jacobs Solutions Inc                      | Jacobs Solutions Inc                      | CUSIP: 46982L108<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     80132 | NS      | $10120671.60  | 0.51%             |  |  |  | No            |                  1 | On Loan: No      |
| Oddity Tech Ltd                           | Oddity Tech Ltd                           | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | IL        |    159695 | NS      | $11886098.85  | 0.59%             |  |  |  | No            |                  1 | On Loan: No      |
| Albany International Corp                 | Albany International Corp                 | CUSIP: 012348108<br>LEI: L73WCPNCZIRSQGZTW097 | Long             | EC               | CORP              | US        |    181484 | NS      | $11990647.88  | 0.60%             |  |  |  | No            |                  1 | On Loan: No      |
| Crane Co                                  | Crane Co                                  | CUSIP: 224408104<br>LEI: 5493000CQRQOTHUODL75 | Long             | EC               | CORP              | US        |    214473 | NS      | $36760672.20  | 1.84%             |  |  |  | No            |                  1 | On Loan: No      |
| Littelfuse Inc                            | Littelfuse Inc                            | CUSIP: 537008104<br>LEI: 549300MY7HLQFYTPCX75 | Long             | EC               | CORP              | US        |     92409 | NS      | $18949389.54  | 0.95%             |  |  |  | No            |                  1 | On Loan: No      |
| Blueprint Medicines Corp                  | Blueprint Medicines Corp                  | CUSIP: 09627Y109<br>LEI: 5299004CC60O9T5HVM83 | Long             | EC               | CORP              | US        |    194742 | NS      | $19737101.70  | 0.99%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio  | MFS Institutional Money Market Portfolio  | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | EC               | RF                | US        |  68683754 | NS      | $68683753.77  | 3.44%             |  |  |  | No            |                  1 | On Loan: No      |
| GFL Environmental Inc                     | GFL Environmental Inc                     | CUSIP: 36168Q104<br>LEI: 549300FYK4MBXWIVZU26 | Long             | EC               | CORP              | CA        |    422148 | NS      | $21288923.64  | 1.07%             |  |  |  | No            |                  1 | On Loan: No      |
| FormFactor Inc                            | FormFactor Inc                            | CUSIP: 346375108<br>LEI: 549300YCEEO6SZD1ZR61 | Long             | EC               | CORP              | US        |    709526 | NS      | $21179351.10  | 1.06%             |  |  |  | No            |                  1 | On Loan: No      |
| TechnipFMC PLC                            | TechnipFMC PLC                            | CUSIP: 000000000<br>LEI: 549300D5I93QWCJTCK36 | Long             | EC               | CORP              | GB        |    600043 | NS      | $18691339.45  | 0.94%             |  |  |  | No            |                  1 | On Loan: No      |
| Kymera Therapeutics Inc                   | Kymera Therapeutics Inc                   | CUSIP: 501575104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    305374 | NS      | $9051285.36   | 0.45%             |  |  |  | No            |                  1 | On Loan: No      |
| SentinelOne Inc                           | SentinelOne Inc                           | CUSIP: 81730H109<br>LEI: 984500DCD44DBF954221 | Long             | EC               | CORP              | US        |   1010501 | NS      | $17794922.61  | 0.89%             |  |  |  | No            |                  1 | On Loan: No      |
| Bio-Techne Corp                           | Bio-Techne Corp                           | CUSIP: 09073M104<br>LEI: 54930073RLKQ51TILZ35 | Long             | EC               | CORP              | US        |    470221 | NS      | $22758696.40  | 1.14%             |  |  |  | No            |                  1 | On Loan: No      |
| Columbia Sportswear Co                    | Columbia Sportswear Co                    | CUSIP: 198516106<br>LEI: 549300OTMCIEUXAH5Z60 | Long             | EC               | CORP              | US        |    196035 | NS      | $12503112.30  | 0.63%             |  |  |  | No            |                  1 | On Loan: No      |
| CCC Intelligent Solutions Holdings Inc    | CCC Intelligent Solutions Holdings Inc    | CUSIP: 12510Q100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   2917191 | NS      | $25612936.98  | 1.28%             |  |  |  | No            |                  1 | On Loan: No      |
| QIAGEN NV                                 | QIAGEN NV                                 | CUSIP: 000000000<br>LEI: 54930036WK3GMCN17Z57 | Long             | EC               | CORP              | NL        |    687391 | NS      | $31021955.83  | 1.55%             |  |  |  | No            |                  1 | On Loan: No      |
| Etoro Group Ltd                           | Etoro Group Ltd                           | CUSIP: 000000000<br>LEI: 213800XPRPJK2X5QRG86 | Long             | EC               | CORP              | VG        |    113826 | NS      | $6738499.20   | 0.34%             |  |  |  | No            |                  1 | On Loan: No      |
| Gitlab Inc                                | Gitlab Inc                                | CUSIP: 37637K108<br>LEI: 9845004Y40FACG81ED49 | Long             | EC               | CORP              | US        |    411536 | NS      | $18729003.36  | 0.94%             |  |  |  | No            |                  1 | On Loan: No      |
| Elastic NV                                | Elastic NV                                | CUSIP: 000000000<br>LEI: 2549003I48WHHH937I59 | Long             | EC               | CORP              | NL        |    215225 | NS      | $17405245.75  | 0.87%             |  |  |  | No            |                  1 | On Loan: No      |
| Legend Biotech Corp                       | Legend Biotech Corp                       | CUSIP: 52490G102<br>LEI: 254900EIUFZTW136H859 | Long             | EC               | CORP              | KY        |    275333 | NS      | $7970890.35   | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| Allegro MicroSystems Inc                  | Allegro MicroSystems Inc                  | CUSIP: 01749D105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    398210 | NS      | $10094623.50  | 0.51%             |  |  |  | No            |                  1 | On Loan: No      |
| ACV Auctions Inc                          | ACV Auctions Inc                          | CUSIP: 00091G104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1425066 | NS      | $23342581.08  | 1.17%             |  |  |  | No            |                  1 | On Loan: No      |
| Schrodinger Inc/United States             | Schrodinger Inc/United States             | CUSIP: 80810D103<br>LEI: 984500044BAE4791E559 | Long             | EC               | CORP              | US        |   1119750 | NS      | $24208995.00  | 1.21%             |  |  |  | No            |                  1 | On Loan: No      |
| Ultragenyx Pharmaceutical Inc             | Ultragenyx Pharmaceutical Inc             | CUSIP: 90400D108<br>LEI: 529900EV44GVDN1DCX77 | Long             | EC               | CORP              | US        |    317856 | NS      | $10816639.68  | 0.54%             |  |  |  | No            |                  1 | On Loan: No      |
| Harmony Biosciences Holdings Inc          | Harmony Biosciences Holdings Inc          | CUSIP: 413197104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    437271 | NS      | $15085849.50  | 0.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Neurocrine Biosciences Inc                | Neurocrine Biosciences Inc                | CUSIP: 64125C109<br>LEI: 549300FECER0XBN49756 | Long             | EC               | CORP              | US        |    116640 | NS      | $14349052.80  | 0.72%             |  |  |  | No            |                  1 | On Loan: No      |
| HealthEquity Inc                          | HealthEquity Inc                          | CUSIP: 42226A107<br>LEI: 529900LRJU1RAFQHM467 | Long             | EC               | CORP              | US        |    246915 | NS      | $24842118.15  | 1.24%             |  |  |  | No            |                  1 | On Loan: No      |
| Masimo Corp                               | Masimo Corp                               | CUSIP: 574795100<br>LEI: 549300Q4A8JK0PIYCU29 | Long             | EC               | CORP              | US        |     91575 | NS      | $14880937.50  | 0.74%             |  |  |  | No            |                  1 | On Loan: No      |
| XPO Inc                                   | XPO Inc                                   | CUSIP: 983793100<br>LEI: 54930096DB9LCLPN7H13 | Long             | EC               | CORP              | US        |    146513 | NS      | $16677574.79  | 0.83%             |  |  |  | No            |                  1 | On Loan: No      |
| CACI International Inc                    | CACI International Inc                    | CUSIP: 127190304<br>LEI: SYRPI2D1O9WRTS2WX210 | Long             | EC               | CORP              | US        |     86328 | NS      | $36948384.00  | 1.85%             |  |  |  | No            |                  1 | On Loan: No      |
| Antero Resources Corp                     | Antero Resources Corp                     | CUSIP: 03674X106<br>LEI: APVBKPOULHUX7YZLKU17 | Long             | EC               | CORP              | US        |    301312 | NS      | $11284134.40  | 0.56%             |  |  |  | No            |                  1 | On Loan: No      |
| Matador Resources Co                      | Matador Resources Co                      | CUSIP: 576485205<br>LEI: 549300CI3Q2UUK5R4G79 | Long             | EC               | CORP              | US        |    270388 | NS      | $11629387.88  | 0.58%             |  |  |  | No            |                  1 | On Loan: No      |
| Certara Inc                               | Certara Inc                               | CUSIP: 15687V109<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1085609 | NS      | $12332518.24  | 0.62%             |  |  |  | No            |                  1 | On Loan: No      |
| QXO Inc                                   | QXO Inc                                   | CUSIP: 82846H405<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    187223 | NS      | $3182791.00   | 0.16%             |  |  |  | No            |                  1 | On Loan: No      |
| CG oncology Inc                           | CG oncology Inc                           | CUSIP: 156944100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    171101 | NS      | $4383607.62   | 0.22%             |  |  |  | No            |                  1 | On Loan: No      |
| Lantheus Holdings Inc                     | Lantheus Holdings Inc                     | CUSIP: 516544103<br>LEI: 5299005HUB5IOJGO7S39 | Long             | EC               | CORP              | US        |    202567 | NS      | $15305962.52  | 0.77%             |  |  |  | No            |                  1 | On Loan: No      |
| Cytokinetics Inc                          | Cytokinetics Inc                          | CUSIP: 23282W605<br>LEI: 549300BE5DY1HW7IHA64 | Long             | EC               | CORP              | US        |    234124 | NS      | $7262526.48   | 0.36%             |  |  |  | No            |                  1 | On Loan: No      |
| TriNet Group Inc                          | TriNet Group Inc                          | CUSIP: 896288107<br>LEI: 5299003FJVBETSFKE990 | Long             | EC               | CORP              | US        |    183930 | NS      | $15304815.30  | 0.77%             |  |  |  | No            |                  1 | On Loan: No      |
| STAG Industrial Inc                       | STAG Industrial Inc                       | CUSIP: 85254J102<br>LEI: 549300QWYX2W6FASVQ07 | Long             | EC               | CORP              | US        |    405267 | NS      | $14419399.86  | 0.72%             |  |  |  | No            |                  1 | On Loan: No      |
| Visteon Corp                              | Visteon Corp                              | CUSIP: 92839U206<br>LEI: 549300MOVLYHRW4GGW78 | Long             | EC               | CORP              | US        |    278527 | NS      | $23514641.98  | 1.18%             |  |  |  | No            |                  1 | On Loan: No      |
| elf Beauty Inc                            | elf Beauty Inc                            | CUSIP: 26856L103<br>LEI: 549300U2K9TCON25C029 | Long             | EC               | CORP              | US        |    149386 | NS      | $16804431.14  | 0.84%             |  |  |  | No            |                  1 | On Loan: No      |
| Metsera Inc                               | Metsera Inc                               | CUSIP: 59267L107<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    171681 | NS      | $4587316.32   | 0.23%             |  |  |  | No            |                  1 | On Loan: —       |
| Amicus Therapeutics Inc                   | Amicus Therapeutics Inc                   | CUSIP: 03152W109<br>LEI: 549300MRD1SMUTNBPQ53 | Long             | EC               | CORP              | US        |   2443065 | NS      | $14829404.55  | 0.74%             |  |  |  | No            |                  1 | On Loan: No      |
| StepStone Group Inc                       | StepStone Group Inc                       | CUSIP: 85914M107<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    561990 | NS      | $32511121.50  | 1.63%             |  |  |  | No            |                  1 | On Loan: No      |
| PROCEPT BioRobotics Corp                  | PROCEPT BioRobotics Corp                  | CUSIP: 74276L105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    138369 | NS      | $8025402.00   | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| Q2 Holdings Inc                           | Q2 Holdings Inc                           | CUSIP: 74736L109<br>LEI: 549300M9RKR9DZXWS696 | Long             | EC               | CORP              | US        |    281024 | NS      | $24595220.48  | 1.23%             |  |  |  | No            |                  1 | On Loan: No      |
| TopBuild Corp                             | TopBuild Corp                             | CUSIP: 89055F103<br>LEI: 5493007YSKHOL4RWII46 | Long             | EC               | CORP              | US        |     93499 | NS      | $26449932.11  | 1.32%             |  |  |  | No            |                  1 | On Loan: No      |
| DigitalBridge Group Inc                   | DigitalBridge Group Inc                   | CUSIP: 25401T603<br>LEI: 549300XG87L902AGBO89 | Long             | EC               | CORP              | US        |   1448634 | NS      | $16021892.04  | 0.80%             |  |  |  | No            |                  1 | On Loan: No      |
| Annexon Inc                               | Annexon Inc                               | CUSIP: 03589W102<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    668226 | NS      | $1363181.04   | 0.07%             |  |  |  | No            |                  1 | On Loan: No      |
| Onto Innovation Inc                       | Onto Innovation Inc                       | CUSIP: 683344105<br>LEI: 254900RXZVN73CHOO062 | Long             | EC               | CORP              | US        |    171251 | NS      | $15744816.94  | 0.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Corsair Gaming Inc                        | Corsair Gaming Inc                        | CUSIP: 22041X102<br>LEI: 549300Y7YT18L8G0H525 | Long             | EC               | CORP              | US        |   1363977 | NS      | $11989357.83  | 0.60%             |  |  |  | No            |                  1 | On Loan: No      |
| Karman Holdings Inc                       | Karman Holdings Inc                       | CUSIP: 485924104<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    257742 | NS      | $11046822.12  | 0.55%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2025-06-27

**Name of Applicant:** MFS SERIES TRUST I

**Signature:** James Byrne

**Name of Signer:** James Byrne

**Title:** Assistant Treasurer