FRONTIER CAPITAL MANAGEMENT CO LLC — 13F Holdings & Portfolio
CIK 351173 · latest 13F-HR filed 2026-05-15
FRONTIER CAPITAL MANAGEMENT CO LLC manages $9.73B in 13F-reported U.S. long-equity assets across 291 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are FTAI (2.67%), DAR (1.56%), UTHR (1.54%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 29 new positions, exited 33, added to 115, and trimmed 107.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$9.73B
Long-equity book
291
Distinct positions
2026-03-31
Filed 2026-05-15
+29 / −33 / ↑115 / ↓107
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- STRIDE INC$126.2M +1209.1%
- AKAMAI TECHNOLOGIES INC$79.2M +198.5%
- KIRBY CORP$71.0M +484.6%
- LIBERTY ENERGY INC$68.5M +2048.4%
- JAZZ PHARMACEUTICALS PLC$66.8M +215.7%
Top Trims
- MONGODB INC-$74.3M -58.6%
- NATERA INC-$60.7M -50.8%
- MATTEL INC-$59.1M -70.6%
- TERADYNE INC-$56.3M -50.9%
- MKS INC.-$51.0M -57.9%
New Positions
- ANTERO RESOURCES CORP$57.3M
- GULFPORT ENERGY CORP$47.0M
- PALVELLA THERAPEUTICS INC NE$46.6M
- LEMONADE INC$42.1M
- CIPHER DIGITAL INC$39.6M
Exited Positions
- WEBSTER FINL CORP$50.4M
- UNITY SOFTWARE INC$46.4M
- BILL HOLDINGS INC$35.0M
- ON HLDG AG$17.0M
- ATLAS ENERGY SOLUTIONS INC$15.6M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | FTAI AVIATION LTD | FTAI | G3730V105 | $260.2M | 2.67% | 1,062,210 | SH |
| 2 | DARLING INGREDIENTS INC | DAR | 237266101 | $151.9M | 1.56% | 2,455,668 | SH |
| 3 | UNITED THERAPEUTICS CORP DEL | UTHR | 91307C102 | $149.8M | 1.54% | 252,702 | SH |
| 4 | CIRCLE INTERNET GROUP INC | CRCL | 172573107 | $147.7M | 1.52% | 1,548,150 | SH |
| 5 | GRANITE CONSTR INC | GVA | 387328107 | $142.4M | 1.46% | 1,187,736 | SH |
| 6 | STRIDE INC | LRN | 86333M108 | $136.6M | 1.40% | 1,549,291 | SH |
| 7 | AMENTUM HOLDINGS INC | AMTM | 023939101 | $128.6M | 1.32% | 4,930,210 | SH |
| 8 | XPO INC | XPO | 983793100 | $126.9M | 1.30% | 652,073 | SH |
| 9 | ALASKA AIR GROUP INC | ALK | 011659109 | $124.1M | 1.28% | 3,373,587 | SH |
| 10 | KNIGHT-SWIFT TRANSN HLDGS IN | KNX | 499049104 | $120.1M | 1.23% | 2,086,544 | SH |
| 11 | AKAMAI TECHNOLOGIES INC | AKAM | 00971T101 | $119.0M | 1.22% | 1,036,569 | SH |
| 12 | EAGLE MATLS INC | EXP | 26969P108 | $115.7M | 1.19% | 610,654 | SH |
| 13 | ULTRA CLEAN HLDGS INC | UCTT | 90385V107 | $111.1M | 1.14% | 1,787,451 | SH |
| 14 | POPULAR INC | BPOP | 733174700 | $107.5M | 1.10% | 800,930 | SH |
| 15 | ASHLAND INC | ASH | 044186104 | $106.4M | 1.09% | 1,912,689 | SH |
| 16 | ATI INC | ATI | 01741R102 | $101.0M | 1.04% | 694,422 | SH |
| 17 | JAZZ PHARMACEUTICALS PLC | JAZZ | G50871105 | $97.8M | 1.01% | 517,284 | SH |
| 18 | TIDEWATER INC NEW | TDW | 88642R109 | $89.6M | 0.92% | 1,072,793 | SH |
| 19 | APOGEE THERAPEUTICS INC | APGE | 03770N101 | $89.6M | 0.92% | 1,064,483 | SH |
| 20 | ENTEGRIS INC | ENTG | 29362U104 | $88.5M | 0.91% | 754,706 | SH |
| 21 | MONOLITHIC PWR SYS INC | MPWR | 609839105 | $87.1M | 0.90% | 79,699 | SH |
| 22 | KIRBY CORP | KEX | 497266106 | $85.6M | 0.88% | 644,329 | SH |
| 23 | AGREE RLTY CORP | ADC | 008492100 | $83.0M | 0.85% | 1,101,386 | SH |
| 24 | SANMINA CORP | SANM | 801056102 | $82.6M | 0.85% | 637,388 | SH |
| 25 | INSMED INC | INSM | 457669307 | $76.8M | 0.79% | 469,561 | SH |
| 26 | ASTERA LABS INC | ALAB | 04626A103 | $75.4M | 0.78% | 688,213 | SH |
| 27 | LIBERTY ENERGY INC | LBRT | 53115L104 | $71.8M | 0.74% | 2,494,222 | SH |
| 28 | BRIDGEBIO PHARMA INC | BBIO | 10806X102 | $71.1M | 0.73% | 957,989 | SH |
| 29 | BUILDERS FIRSTSOURCE INC | BLDR | 12008R107 | $70.8M | 0.73% | 860,494 | SH |
| 30 | BURLINGTON STORES INC | BURL | 122017106 | $70.5M | 0.72% | 216,537 | SH |
| 31 | PERDOCEO ED CORP | PRDO | 71363P106 | $68.7M | 0.71% | 1,846,986 | SH |
| 32 | WEATHERFORD INTL PLC | WFRD | G48833118 | $68.6M | 0.71% | 725,497 | SH |
| 33 | ROYAL CARIBBEAN GROUP | RCL | V7780T103 | $65.6M | 0.67% | 238,299 | SH |
| 34 | INTUITIVE MACHINES INC | LUNR | 46125A100 | $65.2M | 0.67% | 3,513,799 | SH |
| 35 | WINTRUST FINL CORP | WTFC | 97650W108 | $64.2M | 0.66% | 462,012 | SH |
| 36 | SAIA INC | SAIA | 78709Y105 | $64.1M | 0.66% | 182,492 | SH |
| 37 | SILA REALTY TRUST INC | SILA | 146280508 | $63.9M | 0.66% | 2,696,692 | SH |
| 38 | KYMERA THERAPEUTICS INC | KYMR | 501575104 | $63.3M | 0.65% | 759,848 | SH |
| 39 | FIRST BANCORP CORPORATION | FBP | 318672706 | $62.5M | 0.64% | 2,923,738 | SH |
| 40 | INDIE SEMICONDUCTOR INC | INDI | 45569U101 | $62.0M | 0.64% | 19,246,088 | SH |
| 41 | RENASANT CORP | RNST | 75970E107 | $61.5M | 0.63% | 1,702,713 | SH |
| 42 | NATERA INC | NTRA | 632307104 | $58.9M | 0.61% | 294,347 | SH |
| 43 | ANTERO RESOURCES CORP | AR | 03674X106 | $57.3M | 0.59% | 1,349,237 | SH |
| 44 | ELANCO ANIMAL HEALTH INC | ELAN | 28414H103 | $56.5M | 0.58% | 2,362,526 | SH |
| 45 | LATTICE SEMICONDUCTOR CORP | LSCC | 518415104 | $56.1M | 0.58% | 605,318 | SH |
| 46 | EVERPURE INC | P | 74624M102 | $55.8M | 0.57% | 944,522 | SH |
| 47 | EASTERN BANKSHARES INC | EBC | 27627N105 | $55.6M | 0.57% | 2,840,293 | SH |
| 48 | SELECTIVE INS GROUP INC | SIGI | 816300107 | $55.0M | 0.57% | 729,748 | SH |
| 49 | FIRST INDL RLTY TR INC | FR | 32054K103 | $54.7M | 0.56% | 946,365 | SH |
| 50 | TERADYNE INC | TER | 880770102 | $54.3M | 0.56% | 183,204 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-15 | $9.73B | 291 | 0001172661-26-002082 |
| 2025-12-31 | 2026-02-17 | $9.42B | 295 | 0001172661-26-000845 |
| 2025-09-30 | 2025-11-14 | $11.15B | 297 | 0001172661-25-004908 |