FRONTIER CAPITAL MANAGEMENT CO LLC
CIK 351173 · EDGAR ↗
- sum of disclosed values for 2026-03-31; 0 positions have no disclosed value and are left out of the sum, counted here rather than dropped
- $9.7B
- every reported holding for this filer and quarter, including ones with no disclosed value
- 291
- positions with no comparable holding in the prior quarter (kind new), 2026-03-31
- 29
- positions absent from this quarter's filing after being held last quarter (kind exit), 2026-03-31 — inferred from absence, not a sale record
- 33
Quarter-end snapshot, filed up to 45 days later — not current holdings. What a 13F covers ↓
Changes · Quarter ended 2026-03-31. Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.
by shares · How classified ↗Period
| The reviewed ticker for the filed issuer name and share class, the same mapping the Reported positions table uses. Symbols are never inferred from names; — means no reviewed mapping. | position matched across quarters by exact reported CUSIP over a registry gap — never a name match | NEW / ADD / TRIM / EXIT by share count · NO CHANGE = same shares; the value moved with price, so never an ADD or a TRIM · EXIT = absent this quarter (disposed, delisted, confidential, or reported by an affiliate) — the filing does not say which · NO PRIOR = no comparable prior quarter on record (a first filing, or a quarter filed inside an affiliate's report), so not called a new stake · n/c = not classifiable: value undisclosed on one side of the pair, or neither shares nor value can classify it · †v: the reported share count is unchanged across the pair; this build's data classified the change from its reported value; builds from 2026-09-10 on read it as NO CHANGE | derived by Public Filings from the published data; “no value” means the source did not disclose a usable value — never zero | Prev value | Curr value | Prev shares | Curr shares | |
|---|---|---|---|---|---|---|---|---|
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: SHS · position key pos:15350 · issuer key iss:2111 | TRIM | +$5.0M | −234,369 | $255M | $260M | 1,296,579 | 1,062,210 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:11686 · issuer key iss:558 | TRIM | +$53.9M | −264,729 | $97.9M | $152M | 2,720,397 | 2,455,668 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:15016 · issuer key iss:1868 | ADD | +$61.6M | +71,525 | $88.3M | $150M | 181,177 | 252,702 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM CL A · position key pos:13090 · issuer key iss:452 | ADD | +$58.1M | +418,046 | $89.6M | $148M | 1,130,104 | 1,548,150 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:10916 · issuer key iss:846 | TRIM | −$2.7M | −70,167 | $145M | $142M | 1,257,903 | 1,187,736 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:15117 · issuer key iss:1724 | ADD | +$126M | +1,388,589 | $10.4M | $137M | 160,702 | 1,549,291 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:11784 · issuer key iss:100 | TRIM | −$38.8M | −842,766 | $167M | $129M | 5,772,976 | 4,930,210 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:12941 · issuer key iss:1993 | TRIM | +$29.0M | −68,280 | $97.9M | $127M | 720,353 | 652,073 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:17142 · issuer key iss:64 | ADD | +$9.4M | +1,092,815 | $115M | $124M | 2,280,772 | 3,373,587 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:15053 · issuer key iss:1066 | ADD | +$18.0M | +131,997 | $102M | $120M | 1,954,547 | 2,086,544 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:17033 · issuer key iss:60 | ADD | +$79.2M | +579,514 | $39.9M | $119M | 457,055 | 1,036,569 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:14260 · issuer key iss:625 | ADD | +$3.0M | +65,305 | $113M | $116M | 545,349 | 610,654 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:10837 · issuer key iss:1850 | TRIM | +$22.2M | −1,722,388 | $88.9M | $111M | 3,509,839 | 1,787,451 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM NEW · position key pos:17240 · issuer key iss:1468 | TRIM | −$11.4M | −153,300 | $119M | $107M | 954,230 | 800,930 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:10851 · issuer key iss:176 | ADD | +$22.7M | +487,400 | $83.6M | $106M | 1,425,289 | 1,912,689 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:15521 · issuer key iss:76 | TRIM | −$39.9M | −533,031 | $141M | $101M | 1,227,453 | 694,422 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: SHS USD · position key pos:14655 · issuer key iss:2143 | ADD | +$66.8M | +335,083 | $31.0M | $97.8M | 182,201 | 517,284 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:13692 · issuer key iss:1802 | ADD | +$41.7M | +124,056 | $47.9M | $89.6M | 948,737 | 1,072,793 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:13239 · issuer key iss:142 | ADD | +$53.3M | +584,030 | $36.3M | $89.6M | 480,453 | 1,064,483 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:13725 · issuer key iss:664 | TRIM | +$230K | −292,792 | $88.3M | $88.5M | 1,047,498 | 754,706 |
Flags: no row carries a flag.
1–20 of the 100 changes on this page
1–100 of 317 changes
Mark-to-market only (no share change) · 7
Positions whose share count is identical in both quarters; the value changed with price, not with a decision.
| The reviewed ticker for the filed issuer name and share class, the same mapping the Reported positions table uses. Symbols are never inferred from names; — means no reviewed mapping. | position matched across quarters by exact reported CUSIP over a registry gap — never a name match | NEW / ADD / TRIM / EXIT by share count · NO CHANGE = same shares; the value moved with price, so never an ADD or a TRIM · EXIT = absent this quarter (disposed, delisted, confidential, or reported by an affiliate) — the filing does not say which · NO PRIOR = no comparable prior quarter on record (a first filing, or a quarter filed inside an affiliate's report), so not called a new stake · n/c = not classifiable: value undisclosed on one side of the pair, or neither shares nor value can classify it · †v: the reported share count is unchanged across the pair; this build's data classified the change from its reported value; builds from 2026-09-10 on read it as NO CHANGE | derived by Public Filings from the published data; “no value” means the source did not disclose a usable value — never zero | Prev value | Curr value | Prev shares | Curr shares | |
|---|---|---|---|---|---|---|---|---|
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:12127 · issuer key iss:1315 | NO CHANGE | +$62.8K | 0 | $535K | $598K | 12,822 | 12,822 |
| — | share class as filed: COM · position key sid:sec:prov:dcdf9d85329d8c12b54bf106942f0068 · issuer key cusip6:127097 | NO CHANGE | +$110K | 0 | $329K | $440K | 12,509 | 12,509 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: SHS CLASS A · position key pos:18031 · issuer key iss:2202 | NO CHANGE | +$75.3K | 0 | $312K | $387K | 8,070 | 8,070 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM SHS · position key pos:11064 · issuer key iss:1089 | NO CHANGE | +$19.6K | 0 | $309K | $329K | 1,233 | 1,233 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:18125 · issuer key iss:1092 | NO CHANGE | +$203 | 0 | $322K | $322K | 2,544 | 2,544 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:11478 · issuer key iss:1591 | NO CHANGE | −$34.1K | 0 | $309K | $275K | 1,600 | 1,600 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:16976 · issuer key iss:1084 | NO CHANGE | −$7.4K | 0 | $269K | $262K | 8,916 | 8,916 |
Flags: no row carries a flag.
Holdings without a security ID are counted, not compared. Method ↗
Reported positions — 2026-03-31
291 positionsViewThis build carries one quarter for this manager: 2026-03-31. Notable managers carry four published quarters, others two.
| This list carries reported issuer names and security identities, without a dated ticker mapping. Symbols are not inferred from names. | a position composed from a base filing plus NEW-HOLDINGS amendments keeps every source row here; the composition's latest filed date is the one shown served from this build's published holdings (derived from the filer's own reported rows); every row resolves to its filing | Share of total reported value, calculated only when the full position list has disclosed values. This is 13F long value, not total assets. | value undisclosed on the filing: retained and counted, excluded from sums, never shown as $0 | Shares | Wt |
|---|---|---|---|---|---|
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | FTAI AVIATION LTD · SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $260M | 1,062,210 | 2.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | DARLING INGREDIENTS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $152M | 2,455,668 | 1.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | UNITED THERAPEUTICS CORP DEL · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $150M | 252,702 | 1.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CIRCLE INTERNET GROUP INC · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $148M | 1,548,150 | 1.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | GRANITE CONSTR INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $142M | 1,187,736 | 1.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | STRIDE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $137M | 1,549,291 | 1.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AMENTUM HOLDINGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $129M | 4,930,210 | 1.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | XPO INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $127M | 652,073 | 1.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ALASKA AIR GROUP INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $124M | 3,373,587 | 1.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | KNIGHT-SWIFT TRANSN HLDGS IN · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $120M | 2,086,544 | 1.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AKAMAI TECHNOLOGIES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $119M | 1,036,569 | 1.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | EAGLE MATLS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $116M | 610,654 | 1.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ULTRA CLEAN HLDGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $111M | 1,787,451 | 1.1% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | POPULAR INC · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $107M | 800,930 | 1.1% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ASHLAND INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $106M | 1,912,689 | 1.1% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ATI INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $101M | 694,422 | 1.0% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | JAZZ PHARMACEUTICALS PLC · SHS USD CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $97.8M | 517,284 | 1.0% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | TIDEWATER INC NEW · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $89.6M | 1,072,793 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | APOGEE THERAPEUTICS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $89.6M | 1,064,483 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ENTEGRIS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $88.5M | 754,706 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MONOLITHIC PWR SYS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $87.1M | 79,699 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | KIRBY CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $85.6M | 644,329 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AGREE RLTY CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $83.0M | 1,101,386 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SANMINA CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $82.6M | 637,388 | 0.8% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | INSMED INC · COM PAR $.01 CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $76.8M | 469,561 | 0.8% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ASTERA LABS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $75.4M | 688,213 | 0.8% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | LIBERTY ENERGY INC · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $71.8M | 2,494,222 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | BRIDGEBIO PHARMA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $71.1M | 957,989 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | BUILDERS FIRSTSOURCE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $70.8M | 860,494 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | BURLINGTON STORES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $70.5M | 216,537 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | PERDOCEO ED CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $68.7M | 1,846,986 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | WEATHERFORD INTL PLC · ORD SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $68.6M | 725,497 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ROYAL CARIBBEAN GROUP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $65.6M | 238,299 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | INTUITIVE MACHINES INC · CLASS A COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $65.2M | 3,513,799 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | WINTRUST FINL CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $64.2M | 462,012 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SAIA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $64.1M | 182,492 | 0.7% | |
| — | SILA REALTY TRUST INC · COMMON STOCK CUSIP 146280508 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $63.9M | 2,696,692 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | KYMERA THERAPEUTICS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $63.3M | 759,848 | 0.7% | |
| — | FIRST BANCORP CORPORATION · COM NEW CUSIP 318672706 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $62.5M | 2,923,738 | 0.6% | |
| — | INDIE SEMICONDUCTOR INC · CLASS A COM CUSIP 45569U101 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $62.0M | 19,246,088 | 0.6% | |
| — | RENASANT CORP · COM CUSIP 75970E107 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $61.5M | 1,702,713 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | NATERA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $58.9M | 294,347 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ANTERO RESOURCES CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $57.3M | 1,349,237 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ELANCO ANIMAL HEALTH INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $56.5M | 2,362,526 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | LATTICE SEMICONDUCTOR CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $56.1M | 605,318 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | EVERPURE INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $55.8M | 944,522 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | EASTERN BANKSHARES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $55.6M | 2,840,293 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SELECTIVE INS GROUP INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $55.0M | 729,748 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | FIRST INDL RLTY TR INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $54.7M | 946,365 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | TERADYNE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $54.3M | 183,204 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | STAG INDUSTRIAL INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $54.1M | 1,501,567 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MARVELL TECHNOLOGY INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $53.6M | 540,979 | 0.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | FIRST AMERN FINL CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $53.1M | 880,804 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | KBR INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $52.9M | 1,434,095 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | LCI INDS · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $52.8M | 429,091 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MONGODB INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $52.5M | 214,316 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | BELDEN INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $52.3M | 455,338 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MATADOR RES CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $52.0M | 823,306 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MDU RES GROUP INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $51.9M | 2,506,549 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | TD SYNNEX CORPORATION · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $49.5M | 293,282 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ALLEGIANT TRAVEL CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $48.7M | 601,215 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | GARRETT MOTION INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $48.6M | 2,675,133 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | GULFPORT ENERGY CORP · COMMON SHARES CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $47.0M | 221,949 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AAR CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $46.8M | 427,187 | 0.5% | |
| — | PALVELLA THERAPEUTICS INC NE · COM CUSIP 697947109 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $46.6M | 374,035 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ULTRAGENYX PHARMACEUTICAL IN · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $45.9M | 2,191,182 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | WSFS FINL CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $44.2M | 675,496 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MODINE MFG CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $44.2M | 204,039 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | PERMIAN RESOURCES CORP · CLASS A COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $44.2M | 2,071,205 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | COVISTA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $43.9M | 381,161 | 0.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | JABIL INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $43.8M | 164,827 | 0.5% | |
| — | INDEPENDENCE RLTY TR INC · COM CUSIP 45378A106 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $42.7M | 2,869,720 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | LEMONADE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $42.1M | 672,383 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ATMUS FILTRATION TECHNOLOGIE · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $42.1M | 742,221 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | REGAL REXNORD CORPORATION · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $40.8M | 217,910 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | NUVALENT INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $40.5M | 395,546 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | DIODES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $40.4M | 592,499 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ARROW ELECTRS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $40.3M | 280,747 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | COHU INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $39.6M | 1,294,616 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CIPHER DIGITAL INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $39.6M | 3,079,999 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | DIGITALOCEAN HLDGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $39.2M | 457,157 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CARPENTER TECHNOLOGY CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $39.1M | 99,134 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | GUIDEWIRE SOFTWARE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $38.8M | 259,527 | 0.4% | |
| — | RXO INC · COMMON STOCK CUSIP 74982T103 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $38.8M | 2,651,537 | 0.4% | |
| — | TRIUMPH FINANCIAL INC · COM CUSIP 89679E300 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $38.5M | 644,777 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ESSENTIAL PPTYS RLTY TR INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $38.5M | 1,266,487 | 0.4% | |
| — | NMI HLDGS INC · COM CUSIP 629209305 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $38.1M | 1,016,226 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | TIMKEN CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $38.0M | 378,192 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | LXP INDUSTRIAL TRUST · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $37.8M | 817,235 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | PLANET FITNESS MASTER ISSUER · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $37.7M | 506,609 | 0.4% | |
| — | FTAI INFRASTRUCTURE INC · COMMON STOCK CUSIP 35953C106 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $37.3M | 7,555,692 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MKS INC. · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $37.1M | 161,250 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ENVISTA HOLDINGS CORPORATION · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $36.4M | 1,435,870 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SONOCO PRODS CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $36.3M | 671,598 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | INSULET CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $36.2M | 172,513 | 0.4% | |
| — | SIMMONS FIRST NATL CORP · CL A $1 PAR CUSIP 828730200 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $34.9M | 1,792,102 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | KONTOOR BRANDS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $34.6M | 492,525 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CUSHMAN AND WAKEFIELD LTD · COMMON SHARES CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $34.5M | 2,810,943 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AXSOME THERAPEUTICS INC. · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $34.3M | 203,066 | 0.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CENCORA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $34.3M | 109,048 | 0.4% |
1–20 of the 100 positions on this page
1–100 of 291 positions · page 1 of 3
One line per issuer, largest first — open a line for its reported rows. Grouping ↗
Book shape
Tick = median of the 8,748 tracked filers with a 2026-03-31 book (the index median: the 8,662 with a complete book). Concentration uses reported 13F long value, not total assets; the index is withheld when any position lacks a value.- 30.1%below median 80.0%
- integer Herfindahl–Hirschman index in basis points over disclosed position values
- 67 bpsbelow median 446 bps
- holdings with no disclosed value (undisclosed, or unreadable on the filing) — kept and counted, never shown as zero
- 291 / 291median book 97.5 positions
324 quarter-over-quarter rows
Filing history
| Period | Source |
|---|---|
| 2026-03-31 | EDGAR ↗ |
Complete source filings on SEC EDGAR
The filing on EDGAR is the record, including any filed after this build.
Open FRONTIER CAPITAL MANAGEMENT CO LLC's 13F filings on SEC EDGAR ↗A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗
13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.
Positions are quarter-end snapshots filed up to 45 days late — not current holdings: a position may have changed or closed since the quarter ended.
Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars; each record notes its original unit.
Affiliated managers may report the same position, so one position can appear under more than one filer.
Positions under confidential treatment may be omitted until a later amendment discloses them.
These are disclosures, not investment advice.