WESTFIELD CAPITAL MANAGEMENT CO LP
CIK 1177719 · 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
- $23.8B
- every reported holding for this filer and quarter, including ones with no disclosed value
- 250
- positions with no comparable holding in the prior quarter (kind new), 2026-03-31
- 46
- positions absent from this quarter's filing after being held last quarter (kind exit), 2026-03-31 — inferred from absence, not a sale record
- 37
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: COM · position key pos:15642 · issuer key iss:1334 | ADD | −$8.2M | +365,990 | $1.1B | $1.1B | 5,951,049 | 6,317,039 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: SPONSORED ADR · position key pos:15965 · issuer key iss:175 | TRIM | −$4.8M | −372,256 | $1.1B | $1.1B | 5,185,696 | 4,813,440 |
| 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:17974 · issuer key iss:488 | TRIM | +$232M | −47,920 | $624M | $856M | 668,835 | 620,915 |
| 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:13215 · issuer key iss:144 | TRIM | −$95.0M | −141,205 | $890M | $795M | 3,274,318 | 3,133,113 |
| 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 | ADD | +$235M | +497,602 | $463M | $698M | 2,350,625 | 2,848,227 |
| 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:11825 · issuer key iss:1225 | ADD | −$173M | +28,294 | $784M | $611M | 1,621,219 | 1,649,513 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CAP STK CL A · position key pos:15142 · issuer key iss:89 | TRIM | −$99.1M | −151,734 | $682M | $583M | 2,178,478 | 2,026,744 |
| 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:14429 · issuer key iss:923 | ADD | +$72.7M | +70,572 | $455M | $528M | 2,219,125 | 2,289,697 |
| 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:16193 · issuer key iss:1909 | TRIM | +$113M | −356,020 | $369M | $482M | 2,277,716 | 1,921,696 |
| 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:14175 · issuer key iss:95 | TRIM | −$63.2M | −51,116 | $538M | $475M | 2,330,770 | 2,279,654 |
| 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:12735 · issuer key iss:209 | ADD | −$20.1M | +232,957 | $472M | $452M | 831,177 | 1,064,134 |
| 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:12827 · issuer key iss:323 | ADD | −$2.1M | +124,607 | $385M | $383M | 1,112,318 | 1,236,925 |
| 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:15863 · issuer key iss:1123 | ADD | +$37.1M | +87,030 | $298M | $335M | 277,549 | 364,579 |
| 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:14225 · issuer key iss:1758 | ADD | +$42.2M | +100,758 | $268M | $310M | 2,098,104 | 2,198,862 |
| 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:11390 · issuer key iss:720 | TRIM | −$131M | −128,461 | $433M | $301M | 655,283 | 526,822 |
| 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:15633 · issuer key iss:1086 | ADD | +$41.8M | +255,944 | $223M | $265M | 625,562 | 881,506 |
| 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:10888 · issuer key iss:1155 | ADD | +$106M | +206,990 | $134M | $241M | 839,773 | 1,046,763 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM PAR $.01 · position key pos:14207 · issuer key iss:973 | ADD | +$165M | +1,035,938 | $75.3M | $240M | 432,521 | 1,468,459 |
| 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:11660 · issuer key iss:1893 | ADD | +$48.6M | +106,421 | $163M | $212M | 3,539,717 | 3,646,138 |
| 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:12940 · issuer key iss:1567 | ADD | +$22.9M | +580,168 | $181M | $204M | 2,592,443 | 3,172,611 |
Flags: no row carries a flag.
1–20 of the 100 changes on this page
1–100 of 278 changes
Mark-to-market only (no share change) · 9
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 NEW · position key pos:16143 · issuer key iss:448 | NO CHANGE | +$4.9M | 0 | $7.4M | $12.3M | 31,750 | 31,750 |
| 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:11287 · issuer key iss:738 | NO CHANGE | −$833K | 0 | $6.8M | $6.0M | 3,185 | 3,185 |
| 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:15683 · issuer key iss:1526 | NO CHANGE | −$634K | 0 | $6.4M | $5.8M | 40,095 | 40,095 |
| 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:10484 · issuer key iss:805 | NO CHANGE | −$1.3M | 0 | $3.6M | $2.3M | 14,370 | 14,370 |
| — | share class as filed: COM CL A · position key sid:sec:prov:0d66c940342aa8c501c7d44a381f3a7c · issuer key cusip6:75321W | NO CHANGE | −$749K | 0 | $2.2M | $1.5M | 407,328 | 407,328 |
| 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:10136 · issuer key iss:990 | NO CHANGE | −$179K | 0 | $983K | $805K | 3,320 | 3,320 |
| 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:12576 · issuer key iss:622 | NO CHANGE | +$107K | 0 | $570K | $677K | 10,640 | 10,640 |
| 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:14157 · issuer key iss:149 | NO CHANGE | +$79.4K | 0 | $241K | $320K | 936 | 936 |
| 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:12250 · issuer key iss:1708 | NO CHANGE | −$4.5K | 0 | $238K | $233K | 6,467 | 6,467 |
Flags: no row carries a flag.
Holdings without a security ID are counted, not compared. Method ↗
Reported positions — 2026-03-31
246 issuers · 250 rowsViewThis 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) | NVIDIA CORPORATION · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $1.1B | 6,317,039 | 4.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ASCENDIS PHARMA A/S · SPONSORED ADR CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $1.1B | 4,813,440 | 4.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | COMFORT SYS USA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $856M | 620,915 | 3.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | APPLE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $795M | 3,133,113 | 3.3% | |
| 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 2026-05-11 +41d | $698M | 2,848,227 | 2.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MICROSOFT CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $611M | 1,649,513 | 2.6% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ALPHABET INC | $597M | 2,077,231 | 2.5% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | HOWMET AEROSPACE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $528M | 2,289,697 | 2.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | VERTIV HOLDINGS CO · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $482M | 1,921,696 | 2.0% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AMAZON COM INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $475M | 2,279,654 | 2.0% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AXON ENTERPRISE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $452M | 1,064,134 | 1.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | BROADCOM INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $383M | 1,236,925 | 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) | ELI LILLY & CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $335M | 364,579 | 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) | TAPESTRY INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $310M | 2,198,862 | 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) | META PLATFORMS INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $301M | 526,822 | 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) | LPL FINL HLDGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $265M | 881,506 | 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) | MKS INC. · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $241M | 1,046,763 | 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) | INSMED INC · COM PAR $.01 CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $240M | 1,468,459 | 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) | VAXCYTE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $212M | 3,646,138 | 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) | ROCKET LAB CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $204M | 3,172,611 | 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) | NETFLIX INC. · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $189M | 1,969,994 | 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) | API GROUP CORP · COM STK CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $188M | 4,634,929 | 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) | QUANTA SVCS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $182M | 331,816 | 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) | GE VERNOVA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $174M | 199,306 | 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) | ARES MANAGEMENT CORPORATION · CL A COM STK CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $172M | 1,572,787 | 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) | RHYTHM PHARMACEUTICALS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $168M | 1,929,123 | 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) | TAIWAN SEMICONDUCTOR MANUFAC · SPONSORED ADS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $167M | 493,504 | 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) | MARVELL TECHNOLOGY INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $166M | 1,673,381 | 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) | BLOOM ENERGY CORP · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $161M | 1,191,572 | 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) | SAMSARA INC · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $161M | 5,072,821 | 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) | AMETEK INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $160M | 745,832 | 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) | PERMIAN RESOURCES CORP · CLASS A COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $160M | 7,481,457 | 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) | DYNATRACE INC · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $156M | 4,209,594 | 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) | REVOLUTION MEDICINES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $151M | 1,556,578 | 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 2026-05-11 +41d | $151M | 754,729 | 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) | FABRINET · SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $149M | 284,874 | 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) | ABIVAX SA · SPONSORED ADS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $147M | 1,322,938 | 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) | SERVICENOW INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $146M | 1,394,187 | 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) | TECHNIPFMC PLC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $141M | 2,033,755 | 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) | ROYAL CARIBBEAN GROUP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $139M | 505,765 | 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) | HILTON WORLDWIDE HLDGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $139M | 457,425 | 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) | VISA INC · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $138M | 456,548 | 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) | CENCORA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $137M | 436,909 | 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) | ITT INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $134M | 703,309 | 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) | CELSIUS HLDGS INC · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $134M | 3,768,911 | 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) | NEXTPOWER INC · CLASS A COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $133M | 1,107,346 | 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) | CHENIERE ENERGY INC · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $130M | 459,044 | 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) | AMER SPORTS INC · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $130M | 3,937,521 | 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) | REGAL REXNORD CORPORATION · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $128M | 681,717 | 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) | MSCI INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $126M | 233,764 | 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) | GUARDANT HEALTH INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $126M | 1,362,539 | 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) | LIVE NATION ENTERTAINMENT IN · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $124M | 810,710 | 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) | TESLA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $118M | 316,102 | 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) | GLOBE LIFE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $117M | 842,423 | 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) | DUTCH BROS INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $117M | 2,313,357 | 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) | CLOUDFLARE INC · CL A COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $112M | 541,566 | 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) | ROKU INC · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $111M | 1,178,219 | 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) | XPO INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $111M | 571,992 | 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) | FIFTH THIRD BANCORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $111M | 2,385,422 | 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) | EVERPURE INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $111M | 1,874,763 | 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) | KRATOS DEFENSE & SEC SOLUTIO · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $110M | 1,563,146 | 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) | AMERICAN INTL GROUP INC · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $110M | 1,458,711 | 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) | SNOWFLAKE INC · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $108M | 718,810 | 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) | PRIMORIS SVCS CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $106M | 743,269 | 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) | JONES LANG LASALLE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $106M | 347,779 | 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) | LEGENCE CORP · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $105M | 1,861,653 | 0.4% | |
| — | LEGEND BIOTECH CORP · SPONSORED ADS CUSIP 52490G102 quarter ended 2026-03-31 filed filed 2026-05-11 +41d ticker not yet mapped | $104M | 5,763,475 | 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) | KEYCORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $104M | 5,193,334 | 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) | ROSS STORES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $102M | 471,916 | 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) | PALOMAR HLDGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $102M | 854,116 | 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) | PALO ALTO NETWORKS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $102M | 636,483 | 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) | DIAMONDBACK ENERGY INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $99.6M | 503,474 | 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) | PALANTIR TECHNOLOGIES INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $98.7M | 674,557 | 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) | SEMTECH CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $98.5M | 1,280,594 | 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) | WOODWARD INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $97.4M | 272,185 | 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) | ARISTA NETWORKS INC · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $95.8M | 780,402 | 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) | AUTOZONE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $95.8M | 28,363 | 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) | SHARKNINJA INC · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $95.8M | 904,541 | 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) | COHERENT CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $94.5M | 396,644 | 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) | ASTERA LABS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $94.3M | 860,113 | 0.4% | |
| — | BRAZE INC · COM CL A CUSIP 10576N102 quarter ended 2026-03-31 filed filed 2026-05-11 +41d ticker not yet mapped | $93.8M | 3,973,906 | 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) | JABIL INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $92.8M | 349,209 | 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) | LINCOLN ELEC HLDGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $89.2M | 358,165 | 0.4% | |
| — | IMAX CORP · COM CUSIP 45245E109 quarter ended 2026-03-31 filed filed 2026-05-11 +41d ticker not yet mapped | $88.9M | 2,338,776 | 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) | GENEDX HOLDINGS CORP · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $87.9M | 1,369,108 | 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) | GARMIN LTD · SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $87.3M | 376,362 | 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) | CREDO TECHNOLOGY GROUP HOLDI · ORDINARY SHARES CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $86.9M | 926,219 | 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) | F5 INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $86.4M | 298,542 | 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) | EAST WEST BANCORP INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $86.0M | 805,956 | 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) | LIFE TIME GROUP HOLDINGS INC · COMMON STOCK CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $85.8M | 3,185,515 | 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) | BIRKENSTOCK HOLDING PLC · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $83.8M | 2,338,779 | 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) | OREILLY AUTOMOTIVE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $82.0M | 887,999 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MORGAN STANLEY · COM NEW CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $81.7M | 496,558 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | XENON PHARMACEUTICALS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $81.5M | 1,401,483 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ALNYLAM PHARMACEUTICALS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $81.2M | 245,539 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | FIRSTCASH HOLDINGS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $81.2M | 431,993 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | IDEX CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $80.8M | 426,019 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MASTEC INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $80.4M | 249,980 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | HOULIHAN LOKEY INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $78.1M | 543,611 | 0.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | PLEXUS CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-11 +41d | $77.9M | 384,493 | 0.3% |
1–20 of the 100 issuers on this page
1–100 of 246 issuers · 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.- 46.5%below median 80.0%
- integer Herfindahl–Hirschman index in basis points over disclosed position values
- 141 bpsbelow median 446 bps
- holdings with no disclosed value (undisclosed, or unreadable on the filing) — kept and counted, never shown as zero
- 250 / 250median book 97.5 positions
287 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 WESTFIELD CAPITAL MANAGEMENT CO LP'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.