Institutional Manager · CIK 0000351173
FRONTIER CAPITAL MANAGEMENT CO LLC
Boston, MA · File #028-01185
Latest AUM
$9.42B
Positions
295
Top-10 Concentration
33.5%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| REDUCE | COHERENT CORP | COHR | -980,001 | -$180.9M | +$105.4M |
| REDUCE | TERADYNE INC | TER | -855,408 | -$165.6M | +$79.8M |
| ADD | ASTERA LABS INC | ALAB | +733,735 | +$122.1M | -$47,281 |
| REDUCE | VERTIV HOLDINGS CO | VRT | -663,110 | -$107.4M | +$7.9M |
| REDUCE | FTAI AVIATION LTD | FTAIN | -526,181 | -$103.6M | +$54.7M |
| REDUCE | CARLYLE GROUP INC | CGABL | -1,704,906 | -$100.8M | -$7.9M |
| NEW | CIRCLE INTERNET GROUP INC | CRCL | +1,130,104 | +$89.6M | $0 |
| REDUCE | APPLOVIN CORP | APP | -132,292 | -$89.1M | -$6.4M |
| REDUCE | MKS INC. | MKSI | -530,028 | -$84.7M | +$38.9M |
| REDUCE | EAGLE MATLS INC | 26969P108 | -398,334 | -$82.3M | -$24.9M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025295 pos · $9.42B
- 13F HOLDINGS REPORTQ/E Sep 2025297 pos · $11.15B
- 13F HOLDINGS REPORTQ/E Jun 2025294 pos · $10.80B
- 13F HOLDINGS REPORTQ/E Mar 2025283 pos · $9.15B
- 13F HOLDINGS REPORTQ/E Dec 2024285 pos · $10.52B
- 13F HOLDINGS REPORTQ/E Sep 2024281 pos · $10.62B
- 13F HOLDINGS REPORTQ/E Jun 2024279 pos · $10.10B
- 13F HOLDINGS REPORTQ/E Mar 2024269 pos · $10.70B
- 13F HOLDINGS REPORTQ/E Dec 2023267 pos · $9.10B
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | FTAI AVIATION LTD | FTAIN | 1,296,579 | $255.2M | 6.01% |
| 2 | AMENTUM HOLDINGS INC | AMTM | 5,772,976 | $167.4M | 3.94% |
| 3 | GRANITE CONSTR INC | GVA | 1,257,903 | $145.1M | 3.42% |
| 4 | ATI INC | ATI | 1,227,453 | $140.9M | 3.32% |
| 5 | MONGODB INC | MDB | 302,093 | $126.8M | 2.99% |
| 6 | ASTERA LABS INC | ALAB | 735,341 | $122.3M | 2.88% |
| 7 | NATERA INC | NTRA | 521,750 | $119.5M | 2.82% |
| 8 | POPULAR INC | BPOPM | 954,230 | $118.8M | 2.80% |
| 9 | ALASKA AIR GROUP INC | ALK | 2,280,772 | $114.7M | 2.70% |
| 10 | EAGLE MATLS INC | 26969P108 | 545,349 | $112.7M | 2.65% |
| 11 | TERADYNE INC | TER | 571,240 | $110.6M | 2.60% |
| 12 | KNIGHT-SWIFT TRANSN HLDGS IN | 499049104 | 1,954,547 | $102.2M | 2.41% |
| 13 | DARLING INGREDIENTS INC | DAR | 2,720,397 | $97.9M | 2.31% |
| 14 | XPO INC | XPO | 720,353 | $97.9M | 2.31% |
| 15 | SANMINA CORPORATION | SANM | 638,741 | $95.9M | 2.26% |
| 16 | CIRCLE INTERNET GROUP INC | CRCL | 1,130,104 | $89.6M | 2.11% |
| 17 | ULTRA CLEAN HLDGS INC | UCTT | 3,509,839 | $88.9M | 2.09% |
| 18 | UNITED THERAPEUTICS CORP DEL | UTHR | 181,177 | $88.3M | 2.08% |
| 19 | ENTEGRIS INC | ENTG | 1,047,498 | $88.3M | 2.08% |
| 20 | MKS INC. | MKSI | 550,735 | $88.0M | 2.07% |