Frontier Capital Management Co. LLC
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 15, 2026), Frontier Capital Management Co. LLC reported 291 stock positions worth $9.7 billion. Its top holding was Ftai Aviation (FTAI) at 2.7% of the portfolio, followed by Darling Ingredients (DAR, 1.6%) and United Therapeutics (UTHR, 1.5%). Compared with Q4 2025, it opened 29 new positions, sold out of 33, added to 117 and reduced 138. The biggest buy was Stride (LRN, shares +864%) and the biggest sale Mongodb (MDB, shares −29%).
- Most Recent 13F
- Q2 2026
- Location
- Boston, MA
- CIK
- 0000351173
- Portfolio Value
- $9.7B (Q1 2026)
- SEC Filing
- 0001172661-26-002082 ↗ filed May 15, 2026
Holdings Value
Holdings 291 stocks · $9.7B
| FTAI Ftai Aviation Ltd. | 2.67% | 1,062,210 | $260.2M | Reduce -18.1% |
| DAR Darling Ingredients Inc. | 1.56% | 2,455,668 | $151.9M | Reduce -9.7% |
| UTHR United Therapeutics Corp. | 1.54% | 252,702 | $149.8M | Add +39.5% |
| CRCL Circle Internet Group Inc. | 1.52% | 1,548,150 | $147.7M | Add +37.0% |
| GVA Granite Construction Inc. | 1.46% | 1,187,736 | $142.4M | Reduce -5.6% |
| LRN Stride Inc. | 1.40% | 1,549,291 | $136.6M | Add +864.1% |
| AMTM Amentum Holdings Inc. | 1.32% | 4,930,210 | $128.6M | Reduce -14.6% |
| XPO Xpo Inc. | 1.30% | 652,073 | $126.9M | Reduce -9.5% |
| ALK Alaska Air Group Inc. | 1.28% | 3,373,587 | $124.1M | Add +47.9% |
| KNX Knight-Swift Transportation | 1.23% | 2,086,544 | $120.1M | Add +6.8% |
| AKAM Akamai Technologies Inc. | 1.22% | 1,036,569 | $119.0M | Add +126.8% |
| EXP Eagle Materials Inc. | 1.19% | 610,654 | $115.7M | Add +12.0% |
| UCTT Ultra Clean Holdings Inc. | 1.14% | 1,787,451 | $111.1M | Reduce -49.1% |
| BPOP Popular Inc. | 1.10% | 800,930 | $107.5M | Reduce -16.1% |
| ASH Ashland Inc. | 1.09% | 1,912,689 | $106.4M | Add +34.2% |
| ATI Ati Inc. | 1.04% | 694,422 | $101.0M | Reduce -43.4% |
| JAZZ Jazz Pharmaceuticals PLC | 1.01% | 517,284 | $97.8M | Add +183.9% |
| TDW Tidewater Inc. | 0.92% | 1,072,793 | $89.6M | Add +13.1% |
| APGE Apogee Therapeutics Inc. | 0.92% | 1,064,483 | $89.6M | Add +121.6% |
| ENTG Entegris Inc. | 0.91% | 754,706 | $88.5M | Reduce -27.9% |
| MPWR Monolithic Power Systems Inc. | 0.90% | 79,699 | $87.1M | Reduce -5.3% |
| KEX Kirby Corp. | 0.88% | 644,329 | $85.6M | Add +384.7% |
| ADC Agree Realty Corp. | 0.85% | 1,101,386 | $83.0M | Add +36.6% |
| SANM Sanmina Corp. | 0.85% | 637,388 | $82.6M | Reduce -0.2% |
| INSM Insmed Inc. | 0.79% | 469,561 | $76.8M | Add +64.8% |
| ALAB Astera Labs Inc. | 0.78% | 688,213 | $75.4M | Reduce -6.4% |
| LBRT Liberty Energy Inc. | 0.74% | 2,494,222 | $71.8M | Add +1277.0% |
| BBIO Bridgebio Pharma Inc. | 0.73% | 957,989 | $71.1M | Add +16.0% |
| BLDR Builders Firstsource Inc. | 0.73% | 860,494 | $70.8M | Add +49.4% |
| BURL Burlington Stores Inc. | 0.72% | 216,537 | $70.5M | Add +10.1% |
| PRDO Perdoceo Education Corp. | 0.71% | 1,846,986 | $68.7M | Reduce -3.4% |
| WFRD Weatherford International PL | 0.71% | 725,497 | $68.6M | Add +1.5% |
| RCL Royal Caribbean Cruises Ltd. | 0.67% | 238,299 | $65.6M | Add +10.4% |
| LUNR Intuitive Machines Inc. | 0.67% | 3,513,799 | $65.2M | Add +31.6% |
| WTFC Wintrust Financial Corp. | 0.66% | 462,012 | $64.2M | Reduce -14.9% |
| SAIA Saia Inc. | 0.66% | 182,492 | $64.1M | Reduce -1.2% |
| SILA Sila Realty Trust Inc. | 0.66% | 2,696,692 | $63.9M | Add +18.1% |
| KYMR Kymera Therapeutics Inc. | 0.65% | 759,848 | $63.3M | Add +19.5% |
| FBP First Bancorp Puerto Rico | 0.64% | 2,923,738 | $62.5M | Reduce -4.1% |
| INDI Indie Semiconductor Inc. Class A | 0.64% | 19,246,088 | $62.0M | Add +2.1% |
| RNST Renasant Corp. | 0.63% | 1,702,713 | $61.5M | Reduce -15.2% |
| NTRA Natera Inc. | 0.60% | 294,347 | $58.9M | Reduce -43.6% |
| AR Antero Resources Corp. | 0.59% | 1,349,237 | $57.3M | New |
| ELAN Elanco Animal Health Inc. | 0.58% | 2,362,526 | $56.5M | Reduce -8.3% |
| LSCC Lattice Semiconductor Corp. | 0.58% | 605,318 | $56.1M | Reduce -38.1% |
| P Everpure Inc. Class A | 0.57% | 944,522 | $55.8M | Add +7.2% |
| EBC Eastern Bankshares Inc. | 0.57% | 2,840,293 | $55.6M | Reduce -4.1% |
| SIGI Selective Insurance Group | 0.57% | 729,748 | $55.0M | Add +18.6% |
| FR First Industrial Realty TR | 0.56% | 946,365 | $54.7M | Reduce -5.2% |
| TER Teradyne Inc. | 0.56% | 183,204 | $54.3M | Reduce -67.9% |
| STAG Stag Industrial Inc. | 0.56% | 1,501,567 | $54.1M | Add +2.3% |
| MRVL Marvell Technology Inc. | 0.55% | 540,979 | $53.6M | Add +2.3% |
| FAF First American Financial | 0.55% | 880,804 | $53.1M | Add +4.4% |
| KBR KBR Inc. | 0.54% | 1,434,095 | $52.9M | Add +3.8% |
| LCII Lci Industries | 0.54% | 429,091 | $52.8M | Reduce -28.0% |
| MDB Mongodb Inc. | 0.54% | 214,316 | $52.5M | Reduce -29.1% |
| BDC Belden Inc. | 0.54% | 455,338 | $52.3M | Reduce -1.4% |
| MTDR Matador Resources Co. | 0.53% | 823,306 | $52.0M | Add +8.4% |
| MDU Mdu Resources Group Inc. | 0.53% | 2,506,549 | $51.9M | Reduce -4.2% |
| SNX TD Synnex Corp. | 0.51% | 293,282 | $49.5M | Reduce -4.2% |
| ALGT Allegiant Travel Co. | 0.50% | 601,215 | $48.7M | Add +31.1% |
| GTX Garrett Motion Inc. | 0.50% | 2,675,133 | $48.6M | Add +17.2% |
| GPOR Gulfport Energy Corp. | 0.48% | 221,949 | $47.0M | New |
| AIR Aar Corp. | 0.48% | 427,187 | $46.8M | Reduce -9.2% |
| PVLA Palvella Therapeutics Inc. | 0.48% | 374,035 | $46.6M | New |
| RARE Ultragenyx Pharmaceutical Inc. | 0.47% | 2,191,182 | $45.9M | Add +11.5% |
| WSFS WSFS Financial Corp. | 0.45% | 675,496 | $44.2M | Reduce -14.8% |
| MOD Modine Manufacturing Co. | 0.45% | 204,039 | $44.2M | Add +27.9% |
| PR Permian Resources Corp. Class A | 0.45% | 2,071,205 | $44.2M | Reduce -1.1% |
| CVSA Covista Inc. | 0.45% | 381,161 | $43.9M | Reduce -4.2% |
| JBL Jabil Inc. | 0.45% | 164,827 | $43.8M | Add +2.1% |
| IRT Independence Realty Trust Inc. | 0.44% | 2,869,720 | $42.7M | Reduce -6.6% |
| LMND Lemonade Inc. | 0.43% | 672,383 | $42.1M | New |
| ATMU Atmus Filtration Technologie | 0.43% | 742,221 | $42.1M | Add +13.6% |
| RRX Regal Rexnord Corp. | 0.42% | 217,910 | $40.8M | Reduce -44.0% |
| NUVL Nuvalent Inc. Class A | 0.42% | 395,546 | $40.5M | Add +46.2% |
| DIOD Diodes Inc. | 0.42% | 592,499 | $40.4M | Reduce -4.3% |
| ARW Arrow Electronics Inc. | 0.41% | 280,747 | $40.3M | Reduce -4.3% |
| COHU Cohu Inc. | 0.41% | 1,294,616 | $39.6M | Reduce -7.5% |
| CIFR Cipher Digital Inc. | 0.41% | 3,079,999 | $39.6M | New |
| DOCN Digitalocean Holdings Inc. | 0.40% | 457,157 | $39.2M | Reduce -52.0% |
| CRS Carpenter Technology | 0.40% | 99,134 | $39.1M | Reduce -33.3% |
| GWRE Guidewire Software Inc. | 0.40% | 259,527 | $38.8M | Add +117.1% |
| RXO Rxo Inc. | 0.40% | 2,651,537 | $38.8M | Add +69.8% |
| TFIN Triumph Financial Inc. | 0.40% | 644,777 | $38.5M | Reduce -14.3% |
| EPRT Essential Properties Realty | 0.40% | 1,266,487 | $38.5M | Reduce -12.3% |
| NMIH Nmi Holdings Inc. filed as NMI HLDGS INC | 0.39% | 1,016,226 | $38.1M | Reduce -4.1% |
| TKR Timken Co. | 0.39% | 378,192 | $38.0M | Reduce -31.0% |
| LXP LXP Industrial Trust | 0.39% | 817,235 | $37.8M | Add +3.4% |
| PLNT Planet Fitness Inc. Class A | 0.39% | 506,609 | $37.7M | Add +66.7% |
| FIP Ftai Infrastructure Inc. | 0.38% | 7,555,692 | $37.3M | Add +14.9% |
| MKSI MKS Inc. | 0.38% | 161,250 | $37.1M | Reduce -70.7% |
| NVST Envista Holdings Corp. | 0.37% | 1,435,870 | $36.4M | Reduce -4.2% |
| SON Sonoco Products Co. | 0.37% | 671,598 | $36.3M | Add +4.3% |
| PODD Insulet Corp. | 0.37% | 172,513 | $36.2M | Add +48.9% |
| SFNC Simmons First Natl Corp. Class A | 0.36% | 1,792,102 | $34.9M | New |
| KTB Kontoor Brands Inc. | 0.36% | 492,525 | $34.6M | Add +16.5% |
| CWK Cushman & Wakefield Ltd. | 0.35% | 2,810,943 | $34.5M | Reduce -20.9% |
| AXSM Axsome Therapeutics Inc. | 0.35% | 203,066 | $34.3M | Add +28.8% |
| COR Cencora Inc. | 0.35% | 109,048 | $34.3M | New |
Portfolio Sells Q4 2025 → Q1 2026
| MDB Mongodb Inc. | Reduce -29.1% | 0.54% | −0.81 |
| NTRA Natera Inc. | Reduce -43.6% | 0.60% | −0.66 |
| MAT Mattel Inc. | Reduce -59.9% | 0.25% | −0.63 |
| TER Teradyne Inc. | Reduce -67.9% | 0.56% | −0.62 |
| MKSI MKS Inc. | Reduce -70.7% | 0.38% | −0.55 |
| WBS Webster Financial Corp. | Sold out | 0.00% | −0.53 |
| ALAB Astera Labs Inc. | Reduce -6.4% | 0.78% | −0.52 |
| U Unity Software Inc. | Sold out | 0.00% | −0.49 |
| COHR Coherent Corp. | Reduce -71.1% | 0.28% | −0.49 |
| ATI Ati Inc. | Reduce -43.4% | 1.04% | −0.46 |
| AMTM Amentum Holdings Inc. | Reduce -14.6% | 1.32% | −0.46 |
| SNCY Sun Country Airlines Holding | Reduce -82.2% | 0.10% | −0.40 |
| CRDO Credo Technology Group Holdi | Reduce -66.0% | 0.11% | −0.40 |
| GENI Genius Sports Ltd. | Reduce -3.3% | 0.23% | −0.37 |
| BILL Bill Holdings Inc. | Sold out | 0.00% | −0.37 |
| HXL Hexcel Corp. | Reduce -72.0% | 0.12% | −0.28 |
| EPAM Epam Systems Inc. | Reduce -54.0% | 0.11% | −0.27 |
| CWK Cushman & Wakefield Ltd. | Reduce -20.9% | 0.35% | −0.26 |
| LCII Lci Industries | Reduce -28.0% | 0.54% | −0.22 |
| LAD Lithia Motors Inc. | Reduce -46.8% | 0.14% | −0.22 |
| DKNG Draftkings Inc. Class A | Reduce -53.1% | 0.09% | −0.21 |
| PGY Pagaya Technologies Ltd. Class A | Reduce -81.1% | 0.02% | −0.21 |
| TRU Transunion | Reduce -58.0% | 0.10% | −0.20 |
| RKLB Rocket Lab Corp. | Reduce -35.0% | 0.27% | −0.19 |
| SIMO Silicon Motion Technol-ADR | Reduce -46.8% | 0.31% | −0.19 |
| WING Wingstop Inc. | Reduce -44.7% | 0.10% | −0.19 |
| LSCC Lattice Semiconductor Corp. | Reduce -38.1% | 0.58% | −0.19 |
| PCOR Procore Technologies Inc. | Reduce -45.9% | 0.13% | −0.18 |
| ONON On Holding AG Class A | Sold out | 0.00% | −0.18 |
| CRL Charles River Laboratories | Reduce -61.1% | 0.09% | −0.18 |
| IONQ Ionq Inc. | Reduce -97.2% | 0.00% | −0.17 |
| SANM Sanmina Corp. | Reduce -0.2% | 0.85% | −0.17 |
| VST Vistra Corp. | Reduce -29.4% | 0.30% | −0.17 |
| AESI Atlas Energy Solutions Inc. | Sold out | 0.00% | −0.17 |
| FLYW Flywire Corp.-Voting | Sold out | 0.00% | −0.17 |
| APH Amphenol Corp. Class A | Reduce -45.0% | 0.16% | −0.16 |
| MGNI Magnite Inc. | Sold out | 0.00% | −0.16 |
| RRX Regal Rexnord Corp. | Reduce -44.0% | 0.42% | −0.16 |
| BPOP Popular Inc. | Reduce -16.1% | 1.10% | −0.16 |
| MXL Maxlinear Inc. | Sold out | 0.00% | −0.15 |
| CG The Carlyle Group Inc. | Reduce -33.4% | 0.17% | −0.15 |
| WTFC Wintrust Financial Corp. | Reduce -14.9% | 0.66% | −0.15 |
| SNOW Snowflake Inc. | Reduce -34.7% | 0.11% | −0.14 |
| INSP Inspire Medical Systems Inc. | Sold out | 0.00% | −0.14 |
| VEEV Veeva Systems Inc. Class A | Reduce -62.6% | 0.05% | −0.14 |
| BKU Bankunited Inc. | Reduce -36.1% | 0.23% | −0.14 |
| IRT Independence Realty Trust Inc. | Reduce -6.6% | 0.44% | −0.13 |
| PSN Parsons Corp. | Reduce -94.6% | 0.01% | −0.13 |
| BWXT BWX Technologies Inc. | Sold out | 0.00% | −0.13 |
| WEAV Weave Communications Inc. | Reduce -26.4% | 0.10% | −0.13 |
Portfolio Buys Q4 2025 → Q1 2026
| LRN Stride Inc. | Add +864.1% | 1.40% | +1.29 |
| AKAM Akamai Technologies Inc. | Add +126.8% | 1.22% | +0.80 |
| KEX Kirby Corp. | Add +384.7% | 0.88% | +0.72 |
| LBRT Liberty Energy Inc. | Add +1277.0% | 0.74% | +0.70 |
| JAZZ Jazz Pharmaceuticals PLC | Add +183.9% | 1.01% | +0.68 |
| UTHR United Therapeutics Corp. | Add +39.5% | 1.54% | +0.60 |
| AR Antero Resources Corp. | New | 0.59% | +0.59 |
| CRCL Circle Internet Group Inc. | Add +37.0% | 1.52% | +0.57 |
| APGE Apogee Therapeutics Inc. | Add +121.6% | 0.92% | +0.54 |
| GPOR Gulfport Energy Corp. | New | 0.48% | +0.48 |
| PVLA Palvella Therapeutics Inc. | New | 0.48% | +0.48 |
| LMND Lemonade Inc. | New | 0.43% | +0.43 |
| TDW Tidewater Inc. | Add +13.1% | 0.92% | +0.41 |
| CIFR Cipher Digital Inc. | New | 0.41% | +0.41 |
| SFNC Simmons First Natl Corp. Class A | New | 0.36% | +0.36 |
| COR Cencora Inc. | New | 0.35% | +0.35 |
| AGI Alamos Gold Inc. Class A | New | 0.33% | +0.33 |
| INSM Insmed Inc. | Add +64.8% | 0.79% | +0.26 |
| RYZ Ryerson Holding Corp. | Add +304.6% | 0.35% | +0.25 |
| AAOI Applied Optoelectronics Inc. | New | 0.25% | +0.25 |
| CHE Chemed Corp. | New | 0.24% | +0.24 |
| ADC Agree Realty Corp. | Add +36.6% | 0.85% | +0.24 |
| MOD Modine Manufacturing Co. | Add +27.9% | 0.45% | +0.23 |
| MUSA Murphy USA Inc. | New | 0.22% | +0.22 |
| LUNR Intuitive Machines Inc. | Add +31.6% | 0.67% | +0.21 |
| FLR Fluor Corp. | Add +145.1% | 0.32% | +0.21 |
| ASH Ashland Inc. | Add +34.2% | 1.09% | +0.21 |
| BJ Bj's Wholesale Club Holdings | Add +136.6% | 0.32% | +0.19 |
| MTDR Matador Resources Co. | Add +8.4% | 0.53% | +0.19 |
| RXO Rxo Inc. | Add +69.8% | 0.40% | +0.19 |
| BWIN Baldwin Insurance Group Inc./ | Add +329.1% | 0.25% | +0.18 |
| PRAX Praxis Precision Medicines I | New | 0.18% | +0.18 |
| WDAY Workday Inc. Class A | New | 0.15% | +0.15 |
| KNX Knight-Swift Transportation | Add +6.8% | 1.23% | +0.15 |
| GWRE Guidewire Software Inc. | Add +117.1% | 0.40% | +0.14 |
| ACHC Acadia Healthcare Co. Inc. | New | 0.14% | +0.14 |
| RRC Range Resources Corp. | New | 0.14% | +0.14 |
| SYNA Synaptics Inc. | New | 0.13% | +0.13 |
| DECK Deckers Outdoor Corp. | New | 0.13% | +0.13 |
| CVLT Commvault Systems Inc. | New | 0.13% | +0.13 |
| NUVL Nuvalent Inc. Class A | Add +46.2% | 0.42% | +0.13 |
| SOLS Solstice Adv Materials Inc. | New | 0.13% | +0.13 |
| SYM Symbotic Inc. | Add +2069.0% | 0.13% | +0.13 |
| KYMR Kymera Therapeutics Inc. | Add +19.5% | 0.65% | +0.13 |
| PWP Perella Weinberg Partners | Add +53.0% | 0.35% | +0.12 |
| BURL Burlington Stores Inc. | Add +10.1% | 0.72% | +0.12 |
| INSW International Seaways Inc. | Add +25.1% | 0.26% | +0.12 |
| WFRD Weatherford International PL | Add +1.5% | 0.71% | +0.11 |
| MMSI Merit Medical Systems Inc. | Add +97.9% | 0.31% | +0.10 |
| SWKS Skyworks Solutions Inc. | New | 0.10% | +0.10 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 300 | $10.7B | FTAI, GVA, ALK, AAOI, AKAM |
| Q1 2026 | 291 | $9.7B | FTAI, DAR, UTHR, CRCL, GVA |
| Q4 2025 | 295 | $9.4B | FTAI, AMTM, GVA, ATI, MDB |
| Q3 2025 | 297 | $11.2B | FTAI, EXP, TER, BLDR, MPWR |
| Q2 2025 | 294 | $10.8B | FTAI, ATI, MAT, EXP, XPO |
| Q1 2025 | 283 | $9.1B | FTAI, BECN, MAT, EXP, ATI |
| Q4 2024 | 285 | $10.5B | FTAI, BECN, ATI, XPO, EXP |
| Q3 2024 | 281 | $10.6B | FTAI, EXP, ATI, BECN, MAT |
| Q2 2024 | 279 | $10.1B | FTAI, BECN, ATI, UCTT, EXP |
| Q1 2024 | 269 | $10.7B | FTAI, EXP, XPO, BECN, BLDR |