CIK: 0000351173
Total reported value
$9.7B
Reporting period: 2026-03-31 · Number of holdings: 291
FRONTIER CAPITAL MANAGEMENT CO LLC disclosed 291 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $9.7B and a quarterly turnover rate of 39.8%.
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Frontier Capital Management Co LLC's disclosed holdings carry a Herfindahl concentration index of 0.007 — mathematically equivalent to about 148 equally-sized positions, well below its 291 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.98), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Add LRN
+864.1% $126.2M
Trim MDB
-29.1% -$74.3M
Add AKAM
+126.8% $79.2M
Add KEX
+384.7% $71.0M
Add LBRT
+1277.0% $68.5M
Add JAZZ
+183.9% $66.8M
Showing top 200 holdings (of 291 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | FTAI | FTAI Aviation Ltd. | Stock-Industrials | 2.67% | — | -18.08% | |
| 2 | DAR | Darling Ingredients INC | Stock-Consumer Staples | 1.56% | +0.52% | -9.73% | |
| 3 | UTHR | United Therapeutics CORP | Stock-Healthcare | 1.54% | +0.60% | +39.48% | |
| 4 | CRCL | Circle Internet Group INC | Stock-Financials | 1.52% | +0.57% | +36.99% | |
| 5 | GVA | Granite Construction INC | Stock-Industrials | 1.46% | — | -5.58% | |
| 6 | LRN | Stride INC | Stock-Consumer Staples | 1.40% | +1.29% | +864.08% | |
| 7 | AMTM | Amentum Holdings INC | Stock-Industrials | 1.32% | -0.46% | -14.60% | |
| 8 | XPO | Xpo INC | Stock-Industrials | 1.30% | +0.26% | -9.48% | |
| 9 | ALK | Alaska Air Group INC | Stock-Industrials | 1.28% | — | +47.91% | |
| 10 | KNX | Knight-swift Transportation | Stock-Industrials | 1.23% | — | +6.75% | |
| 11 | AKAM | Akamai Technologies INC | Stock-Tech | 1.22% | +0.80% | +126.79% | |
| 12 | EXP | Eagle Materials INC | Stock-Materials | 1.19% | — | +11.97% | |
| 13 | UCTT | Ultra Clean Holdings INC | Stock-Other | 1.14% | +0.20% | -49.07% | |
| 14 | BPOP | Popular INC | Stock-Financials | 1.10% | — | -16.07% | |
| 15 | ASH | Ashland INC | Stock-Materials | 1.09% | +0.20% | +34.20% | |
| 16 | ATI | Ati INC | Stock-Industrials | 1.04% | -0.45% | -43.43% | |
| 17 | JAZZ | Jazz Pharmaceuticals plc | Stock-Healthcare | 1.01% | +0.68% | +183.91% | |
| 18 | TDW | Tidewater INC | Stock-Energy | 0.92% | +0.41% | +13.08% | |
| 19 | APGE | Apogee Therapeutics INC | Stock-Other | 0.92% | +0.54% | +121.56% | |
| 20 | ENTG | Entegris INC | Stock-Tech | 0.91% | — | -27.95% | |
| 21 | MPWR | Monolithic Power Systems INC | Stock-Tech | 0.90% | — | -5.25% | |
| 22 | KEX | Kirby CORP | Stock-Industrials | 0.88% | +0.72% | +384.71% | |
| 23 | ADC | Agree Realty CORP | Stock-Real Estate | 0.85% | +0.23% | +36.61% | |
| 24 | SANM | Sanmina CORP | Stock-Tech | 0.85% | — | -0.21% | |
| 25 | INSM | Insmed INC | Stock-Healthcare | 0.79% | +0.26% | +64.85% | |
| 26 | ALAB | Astera Labs INC | Stock-Tech | 0.78% | -0.52% | -6.41% | |
| 27 | LBRT | Liberty Energy INC | Stock-Energy | 0.74% | +0.70% | +1277.04% | |
| 28 | BBIO | Bridgebio Pharma INC | Stock-Healthcare | 0.73% | — | +15.96% | |
| 29 | BLDR | Builders Firstsource INC | Stock-Industrials | 0.73% | — | +49.35% | |
| 30 | BURL | Burlington Stores INC | Stock-Consumer Disc | 0.72% | — | +10.07% | |
| 31 | PRDO | Perdoceo Education CORP | Stock-Other | 0.71% | — | -3.42% | |
| 32 | WFRD | Weatherford International plc | Stock-Energy | 0.71% | — | +1.53% | |
| 33 | RCL | Royal Caribbean Cruises Ltd. | Stock-Consumer Disc | 0.67% | — | +10.40% | |
| 34 | LUNR | Intuitive Machines INC | Stock-Other | 0.67% | +0.21% | +31.65% | |
| 35 | WTFC | Wintrust Financial CORP | Stock-Financials | 0.66% | — | -14.92% | |
| 36 | SAIA | Saia INC | Stock-Industrials | 0.66% | — | -1.21% | |
| 37 | SILA | Sila Realty Trust INC | Stock-Other | 0.66% | — | +18.05% | |
| 38 | KYMR | Kymera Therapeutics INC | Stock-Other | 0.65% | — | +19.48% | |
| 39 | FBP | First Bancorp Puerto Rico | Stock-Other | 0.64% | — | -4.09% | |
| 40 | INDI | Indie Semiconductor Inc-a | Stock-Other | 0.64% | — | +2.14% | |
| 41 | RNST | Renasant CORP | Stock-Other | 0.63% | — | -15.23% | |
| 42 | NTRA | Natera INC | Stock-Healthcare | 0.61% | -0.67% | -43.58% | |
| 43 | AR | Antero Resources CORP | Stock-Energy | 0.59% | +0.59% | NEW | |
| 44 | ELAN | Elanco Animal Health INC | Stock-Healthcare | 0.58% | — | -8.30% | |
| 45 | LSCC | Lattice Semiconductor CORP | Stock-Tech | 0.58% | — | -38.15% | |
| 46 | P | Everpure Inc-a | Stock-Tech | 0.57% | — | +7.22% | |
| 47 | EBC | Eastern Bankshares INC | Stock-Other | 0.57% | — | -4.10% | |
| 48 | SIGI | Selective Insurance Group | Stock-Financials | 0.57% | — | +18.62% | |
| 49 | FR | First Industrial Realty Tr | Stock-Real Estate | 0.56% | — | -5.20% | |
| 50 | TER | Teradyne INC | Stock-Tech | 0.56% | -0.61% | -67.93% |
Performance for Q3 2026
+4.5%
Performance Last 4 Quarters
+39.9%
Based on 77% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 291 | $9.7B | 40 | |
| 2025-12-31 | 295 | $9.4B | 51 | |
| 2025-09-30 | 297 | $11.2B | 57 | |
| 2025-06-30 | 294 | $10.8B | 0 | |
| 2025-03-31 | 283 | $9.1B | 100 | |
| 2024-12-31 | 285 | $10.5B | 0 | |
| 2024-09-30 | 281 | $10.6B | 0 | |
| 2024-06-30 | 279 | $10.1B | 0 | |
| 2024-03-31 | 269 | $10.7B | 0 | |
| 2023-12-31 | 263 | $9.9B | 0 | |
| 2023-09-30 | 267 | $9.1B | 0 | |
| 2023-06-30 | 261 | $10.4B | 0 | |
| 2023-03-31 | 257 | $9.7B | 0 | |
| 2022-12-31 | 262 | $9.2B | 0 | |
| 2022-09-30 | 268 | $8.5B | 0 | |
| 2022-06-30 | 274 | $8.7B | 0 | |
| 2022-03-31 | 267 | $11.0B | 0 | |
| 2021-12-31 | 274 | $12.7B | 0 | |
| 2021-09-30 | 280 | $12.7B | 0 | |
| 2021-06-30 | 284 | $13.7B | 98 | |
| 2021-03-31 | 276 | $13.2B | 40 | |
| 2020-12-31 | 284 | $13.5B | 38 | |
| 2020-09-30 | 291 | $11.5B | 33 | |
| 2020-06-30 | 291 | $11.3B | 41 | |
| 2020-03-31 | 275 | $8.9B | 58 | |
| 2019-12-31 | 281 | $13.5B | 30 | |
| 2019-09-30 | 289 | $12.8B | 38 | |
| 2019-06-30 | 288 | $13.3B | 33 | |
| 2019-03-31 | 296 | $14.1B | 36 | |
| 2018-12-31 | 287 | $12.4B | 36 | |
| 2018-09-30 | 287 | $15.5B | 30 | |
| 2018-06-30 | 298 | $14.1B | 29 | |
| 2018-03-31 | 311 | $13.7B | 25 | |
| 2017-12-31 | 320 | $13.7B | 24 | |
| 2017-09-30 | 321 | $13.9B | 22 | |
| 2017-06-30 | 322 | $13.7B | 25 | |
| 2017-03-31 | 324 | $13.5B | 21 | |
| 2016-12-31 | 321 | $13.0B | 34 | |
| 2016-09-30 | 344 | $12.5B | 27 | |
| 2016-06-30 | 340 | $12.2B | 26 | |
| 2016-03-31 | 342 | $12.6B | 28 | |
| 2015-12-31 | 351 | $12.1B | 36 | |
| 2015-09-30 | 352 | $11.9B | 33 | |
| 2015-06-30 | 363 | $13.9B | 26 | |
| 2015-03-31 | 363 | $13.9B | 30 | |
| 2014-12-31 | 359 | $13.6B | 35 | |
| 2014-09-30 | 349 | $12.4B | 26 | |
| 2014-06-30 | 348 | $13.6B | 24 | |
| 2014-03-31 | 348 | $13.8B | 30 | |
| 2013-12-31 | 309 | $13.5B | 28 | |
| 2013-09-30 | 320 | $13.0B | 29 | |
| 2013-06-30 | 322 | $12.0B | 0 |
Frontier Capital Management Co LLC's most significant position changes for 2026-03-31: New buy: Antero Resources CORP (AR); Sold out: Webster Financial CORP (WBS); New buy: Gulfport Energy CORP (GPOR); New buy: Palvella Therapeutics INC (PVLA); Sold out: Unity Software INC (U).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | LRN | Stride INC | +1.3% | +864.08% | Add |
| 2 | AKAM | Akamai Technologies INC | +0.8% | +126.79% | Add |
| 3 | KEX | Kirby CORP | +0.7% | +384.71% | Add |
| 4 | LBRT | Liberty Energy INC | +0.7% | +1277.04% | Add |
| 5 | JAZZ | Jazz Pharmaceuticals plc | +0.7% | +183.91% | Add |
| 6 | UTHR | United Therapeutics CORP | +0.6% | +39.48% | Add |
| 7 | CRCL | Circle Internet Group INC | +0.6% | +36.99% | Add |
| 8 | APGE | Apogee Therapeutics INC | +0.5% | +121.56% | Add |
| 9 | DAR | Darling Ingredients INC | +0.5% | -9.73% | Trim |
| 10 | TDW | Tidewater INC | +0.4% | +13.08% | Add |
| 11 | XPO | Xpo INC | +0.3% | -9.48% | Trim |
| 12 | INSM | Insmed INC | +0.3% | +64.85% | Add |
| 13 | RYZ | Ryerson Holding CORP | +0.3% | +304.65% | Add |
| 14 | ADC | Agree Realty CORP | +0.2% | +36.61% | Add |
| 15 | MOD | Modine Manufacturing Co | +0.2% | +27.94% | Add |
| 16 | LUNR | Intuitive Machines INC | +0.2% | +31.65% | Add |
| 17 | ASH | Ashland INC | +0.2% | +34.20% | Add |
| 18 | UCTT | Ultra Clean Holdings INC | +0.2% | -49.07% | Trim |
| 19 | FLR | Fluor CORP | +0.2% | +145.12% | Add |
| 20 | DKNG | Draftkings Inc-cl A | -0.2% | -53.14% | Trim |
| 21 | LAD | Lithia Motors INC | -0.2% | -46.75% | Trim |
| 22 | CWK | Cushman & Wakefield Limited | -0.3% | -20.88% | Trim |
| 23 | HXL | Hexcel CORP | -0.3% | -71.98% | Trim |
| 24 | EPAM | Epam Systems INC | -0.3% | -54.03% | Trim |
| 25 | GENI | Genius Sports Limited | -0.4% | -3.27% | Trim |
| 26 | CRDO | Credo Technology Group Holding Ltd | -0.4% | -66.04% | Trim |
| 27 | SNCY | Sun Country Airlines Holding | -0.4% | -82.23% | Trim |
| 28 | ATI | Ati INC | -0.5% | -43.43% | Trim |
| 29 | AMTM | Amentum Holdings INC | -0.5% | -14.60% | Trim |
| 30 | COHR | Coherent CORP | -0.5% | -71.12% | Trim |
| 31 | ALAB | Astera Labs INC | -0.5% | -6.41% | Trim |
| 32 | MKSI | Mks INC | -0.6% | -70.72% | Trim |
| 33 | TER | Teradyne INC | -0.6% | -67.93% | Trim |
| 34 | MAT | Mattel INC | -0.6% | -59.88% | Trim |
| 35 | NTRA | Natera INC | -0.7% | -43.58% | Trim |
| 36 | MDB | Mongodb INC | -0.8% | -29.06% | Trim |
| 37 | AR | Antero Resources CORP | — | NEW | New buy |
| 38 | WBS | Webster Financial CORP | — | EXIT | Sold out |
| 39 | GPOR | Gulfport Energy CORP | — | NEW | New buy |
| 40 | PVLA | Palvella Therapeutics INC | — | NEW | New buy |
| 41 | U | Unity Software INC | — | EXIT | Sold out |
| 42 | LMND | Lemonade INC | — | NEW | New buy |
| 43 | CIFR | Cipher Digital INC | — | NEW | New buy |
| 44 | BILL | Bill Holdings INC | — | EXIT | Sold out |
| 45 | SFNC | Simmons First Natl Corp-cl A | — | NEW | New buy |
| 46 | COR | Cencora INC | — | NEW | New buy |
| 47 | AGI | Alamos Gold Inc-class A | — | NEW | New buy |
| 48 | AAOI | Applied Optoelectronics INC | — | NEW | New buy |
| 49 | CHE | Chemed CORP | — | NEW | New buy |
| 50 | MUSA | Murphy USA INC | — | NEW | New buy |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-15 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-17 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-14 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-14 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-15 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-14 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-14 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-14 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-14 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-14 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-14 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-15 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-14 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-07-20 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-04-14 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-01-19 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-10-19 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-09 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-13 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-01-19 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-16 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-07-17 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-04-16 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-14 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-14 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-07 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-01-25 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-10-30 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-03 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-04-30 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-01-18 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-10-31 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-04 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-10 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-03 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-02 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-04 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-01-27 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-10-23 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-07-24 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-04 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-01-23 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-31 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-01 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-04-30 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-01-31 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-10-23 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-07-22 | 13F-HR | View on EDGAR |
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