13F holdings
LOOMIS SAYLES & CO L P portfolio
Managed by . 718 reported positions worth $74.3B as of 2026-03-31, filed with the SEC on 2026-05-14. Parsed from the filing itself, not a reseller.
$74.3B
Book value
718
Positions
52%
Top 10 weight
+90
New this quarter
-67
Exited
134 days
Age today
How old this actually is
Every position on this page is a snapshot of 2026-03-31. It was already 44 days old on 2026-05-14, the day it first became public. Today it is 134 days old.
That lag is the law, not a service level — Rule 13f-1 gives managers 45 days after quarter end to file, and no product can shorten it. A fund can have sold every share below before you read this sentence. Treat it as a record of what happened, never as a position you can follow.
What changed
Positions opened and closed
Against its 2025-12-31 filing. This is the part worth reading — the holdings table below is mostly years old.
New positions (90)
| Ticker | Issuer | Value | Shares | % of book |
|---|---|---|---|---|
| PIPR | PIPER SANDLER COS | $41.1M | 536,352 | 0.06% |
| PTCT | PTC THERAPEUTICS INC | $33.6M | 493,603 | 0.05% |
| ADEA | ADEIA INC | $32.1M | 1,333,941 | 0.04% |
| TWST | TWIST BIOSCIENCE CORP | $23.4M | 492,290 | 0.03% |
| XJQCX | NUVEEN CREDIT STRAT INCM | $22.0M | 4,526,488 | 0.03% |
| JFR | NUVEEN FLOAT RATE INC FD | $21.8M | 2,897,039 | 0.03% |
| SIMO | SILICON MOTION TECHNOL-ADR | $21.2M | 188,653 | 0.03% |
| SGHC | SUPER GROUP SGHC LTD | $20.2M | 1,867,557 | 0.03% |
| FTRE | FORTREA HOLDINGS INC-W/I | $17.2M | 1,822,769 | 0.02% |
| ONTO | ONTO INNOVATION INC | $16.6M | 81,072 | 0.02% |
| INVX | INNOVEX INTERNATIONAL INC | $16.4M | 671,309 | 0.02% |
| WBI | WATERBRIDGE INFRASTRUC-CL A | $16.1M | 600,602 | 0.02% |
| UCTT | ULTRA CLEAN HOLDINGS | $14.4M | 231,058 | 0.02% |
| APTV | APTIV HOLDINGS LTD | $14.0M | 202,106 | 0.02% |
| POOL | POOL CORP | $13.6M | 67,256 | 0.02% |
| FFBC | FIRST FINANCIAL BANCORP | $13.2M | 474,824 | 0.02% |
| JKHY | HENRY JACK & ASSOCIATES | $12.7M | 80,173 | 0.02% |
| TECH | BIO-TECHNE CORPORAT | $12.3M | 236,142 | 0.02% |
| ESI | ELEMENT SOLUTIONS INC | $12.2M | 356,807 | 0.02% |
| LCII | LCI INDUSTRIES | $12.0M | 97,941 | 0.02% |
| WAY | WAYSTAR HOLDING CORP | $11.9M | 493,203 | 0.02% |
| BC | BRUNSWICK CORP | $11.9M | 163,222 | 0.02% |
| NTAP | NETAPP INC | $11.5M | 112,235 | 0.02% |
| GXO | GXO LOGISTICS INC | $11.4M | 219,142 | 0.02% |
| ORCL 6.5 01/15/29 D | ORACLE CORP CVTPFD 6.5 | $11.3M | 76,607 | 0.02% |
Closed out (67)
| Ticker | Issuer | Was worth | Shares | % of book |
|---|---|---|---|---|
| 62C | PIPER SANDLER COS | $49.4M | 145,277 | 0.00% |
| 1U5 | WAVE LIFE SCIENCES PTE LTD | $34.7M | 2,040,223 | 0.00% |
| CMG | CHIPOTLE MEXICAN GRILL INC | $34.2M | 925,467 | 0.00% |
| ADBE | ADOBE SYS | $33.3M | 95,127 | 0.00% |
| BLDR | BUILDERS FIRSTSOURCE INC | $30.4M | 295,627 | 0.00% |
| STEP | STEPSTONE GROUP INC-CLASS A | $24.5M | 381,770 | 0.00% |
| RPC | P10 INC-A | $18.6M | 1,900,991 | 0.00% |
| LIF | LIFE360 INC | $18.0M | 280,074 | 0.00% |
| CYBR | CYBERARK SOFTWARE LTD/ISRAEL | $17.3M | 38,849 | 0.00% |
| EXLS | EXLSERVICE HOLDINGS INC | $16.3M | 384,887 | 0.00% |
| IEMG | ISHARES CORE MSCI EMERGING | $13.8M | 205,221 | 0.00% |
| HAE | HAEMONETICS CORP | $12.4M | 154,247 | 0.00% |
| KD | KYNDRYL HOLDINGS INC-W/I | $10.4M | 390,593 | 0.00% |
| KBH | KB HOME CORP | $10.3M | 182,047 | 0.00% |
| VYX | NCR Voyix Corp | $9.9M | 966,435 | 0.00% |
| SPOT 0 03/15/26 | SPOTIFY USA INC CVT | $7.9M | 13,581 | 0.00% |
| PXED | PHOENIX EDUCATION PARTNERS I | $7.2M | 237,333 | 0.00% |
| ADUS | ADDUS HOMECARE CORP | $6.8M | 63,017 | 0.00% |
| IIIV | I3 VERTICALS INC-CLASS A | $6.8M | 268,245 | 0.00% |
| TYL 0.25 03/15/26 | TYLER TECHNOLOGIES INC CVT | $6.3M | 13,874 | 0.00% |
| LMB | LIMBACH HOLDINGS INC | $6.0M | 77,354 | 0.00% |
| BRBR | BELLRING BRANDS INC | $5.6M | 209,085 | 0.00% |
| IRTC 1.5 09/01/29 | IRHYTHM TECHNOLOGIES INC CVT | $3.9M | 21,940 | 0.00% |
| VWO | VANGUARD FTSE EMERGING MARKETS ETF | $3.6M | 67,753 | 0.00% |
| ES | EVERSOURCE ENERGY | $3.5M | 52,696 | 0.00% |
Added to (153)
| Ticker | Issuer | Value | Shares | % of book | Shares Δ |
|---|---|---|---|---|---|
| NVDA | NVIDIA CORP | $7.1B | 40,977,042 | 9.61% | +2% |
| GOOGL | ALPHABET INC-CL A | $5.0B | 17,339,594 | 6.71% | +1% |
| AMZN | AMAZON.COM INC | $3.8B | 18,325,770 | 5.13% | +2% |
| NFLX | NETFLIX.COM INC | $3.7B | 37,973,545 | 4.91% | +2% |
| ORCL | ORACLE CORP | $2.5B | 16,839,240 | 3.33% | +4% |
| MSFT | MICROSOFT CORP | $2.2B | 6,063,327 | 3.02% | +1% |
| BKNG | BOOKING HOLDINGS INC | $517.4M | 122,877 | 0.70% | +6097% |
| MA | MASTERCARD INC-CLASS A | $307.4M | 615,244 | 0.41% | +5% |
| LSGR | NATIXIS LOOMIS FOCUSED GRWTH | $294.9M | 7,487,001 | 0.40% | +2% |
| SPGI | S&P GLOBAL | $286.9M | 674,466 | 0.39% | +6% |
| TT | TRANE TECHNOLOGIES PLC | $211.5M | 507,505 | 0.28% | +6% |
| ALNY | ALNYLAM PHARMACEUTICALS INC | $169.4M | 512,097 | 0.23% | +5% |
| PGR | PROGRESSIVE CORP | $150.8M | 760,877 | 0.20% | +26% |
| ARM | ARM HOLDINGS PLC | $130.1M | 860,262 | 0.18% | +4% |
| EXPE | EXPEDIA INC | $90.4M | 391,396 | 0.12% | +416% |
Trimmed (380)
| Ticker | Issuer | Value | Shares | % of book | Shares Δ |
|---|---|---|---|---|---|
| PEN | PENUMBRA INC | $117,557 | 358 | 0.00% | -100% |
| GIS | GEN MILLS | $4,094 | 110 | 0.00% | -96% |
| FIVN | FIVE9 INC | $564,249 | 37,195 | 0.00% | -96% |
| CNXC | CONCENTRIX CORP | $577,953 | 21,124 | 0.00% | -96% |
| PD | PAGERDUTY INC | $297,535 | 47,912 | 0.00% | -96% |
| NOMD | NOMAD FOODS LTD | $872,901 | 90,833 | 0.00% | -95% |
| UFPT | UFP TECHNOLOGIES INC | $37,977 | 196 | 0.00% | -94% |
| UFPI | UFP INDUSTRIES INC | $53,697 | 583 | 0.00% | -93% |
| PATH | UIPATH INC - CLASS A | $2,187 | 197 | 0.00% | -93% |
| BA 6 10/15/27 | BOEING CO/THE CVTPFD 6.0 | $3.9M | 19,393 | 0.01% | -93% |
| STEVANATO GROUP SPA | STEVANATO GROUP SPA | $796,180 | 57,904 | 0.00% | -93% |
| ACM | AECOM TECHNOLOGY CORP | $72,503 | 855 | 0.00% | -93% |
| UTHR | UNITED THERAPEUTICS CORP | $191,669 | 323 | 0.00% | -92% |
| FOUR | SHIFT4 PAYMENTS INC-CLASS A | $673,687 | 15,406 | 0.00% | -92% |
| CHART INDUSTRIES INC | CHART INDUSTRIES INC | $99,747 | 482 | 0.00% | -92% |
The book
Largest 150 of 718 holdings
| Ticker | Issuer | Value | Shares | % of book | Shares Δ |
|---|---|---|---|---|---|
| NVDA | NVIDIA CORP | $7.1B | 40,977,042 | 9.61% | — |
| GOOGL | ALPHABET INC-CL A | $5.0B | 17,339,594 | 6.71% | — |
| TSLA | TESLA INC | $4.7B | 12,655,011 | 6.33% | — |
| META | META PLATFORMS INC | $4.3B | 7,450,101 | 5.73% | — |
| AMZN | AMAZON.COM INC | $3.8B | 18,325,770 | 5.13% | — |
| NFLX | NETFLIX.COM INC | $3.7B | 37,973,545 | 4.91% | — |
| BA | BOEING CO | $2.8B | 14,061,954 | 3.77% | — |
| V | VISA INC-CLASS A SHRS | $2.8B | 9,253,861 | 3.76% | — |
| ORCL | ORACLE CORP | $2.5B | 16,839,240 | 3.33% | — |
| MSFT | MICROSOFT CORP | $2.2B | 6,063,327 | 3.02% | — |
| MNST | MONSTER BEVERAGE CORPORATION | $1.9B | 25,905,224 | 2.53% | — |
| VRTX | VERTEX PHARMACEUTICALS INC | $1.8B | 4,003,821 | 2.41% | — |
| SHOP | SHOPIFY INC - CLASS A | $1.7B | 14,403,445 | 2.30% | — |
| REGN | REGENERON PHARMACEUTICALS | $1.5B | 1,912,310 | 1.99% | — |
| ADSK | AUTODESK INC | $1.4B | 5,740,231 | 1.85% | — |
| DIS | THE WALT DISNEY CO | $1.3B | 13,991,645 | 1.81% | — |
| CRM | SALESFORCE.COM INC | $1.1B | 6,056,754 | 1.52% | — |
| SBUX | STARBUCKS CORP | $840.0M | 9,376,448 | 1.13% | — |
| NVS | NOVARTIS AG SPON ADR | $828.8M | 5,426,100 | 1.12% | — |
| GOOG | ALPHABET INC-CL C | $816.9M | 2,847,659 | 1.10% | — |
| EXPD | EXPEDITORS INTL WASH INC | $804.2M | 5,614,806 | 1.08% | — |
| ISRG | INTUITIVE SURGICAL INC | $783.5M | 1,699,693 | 1.05% | — |
| DE | DEERE & CO | $774.4M | 1,374,811 | 1.04% | — |
| SEIC | SEI INVESTMENTS CO | $677.1M | 8,628,879 | 0.91% | — |
| TMO | THERMO FISHER SCIENTIFIC INC | $670.3M | 1,363,758 | 0.90% | — |
| NVO | NOVO-NORDISK A/S SPONS ADR | $625.4M | 17,017,315 | 0.84% | — |
| YUM | YUM! BRANDS INC | $581.7M | 3,741,574 | 0.78% | — |
| QCOM | QUALCOMM INC | $540.8M | 4,199,416 | 0.73% | — |
| BKNG | BOOKING HOLDINGS INC | $517.4M | 122,877 | 0.70% | — |
| XYZ | BLOCK INC | $446.8M | 7,423,669 | 0.60% | — |
| NKE | NIKE INC CL B | $418.8M | 7,927,988 | 0.56% | — |
| ILMN | ILLUMINA INC | $362.8M | 2,942,977 | 0.49% | — |
| FDS | FACTSET RESEARCH SYSTEMS INC | $320.7M | 1,478,028 | 0.43% | — |
| MA | MASTERCARD INC-CLASS A | $307.4M | 615,244 | 0.41% | — |
| LSGR | NATIXIS LOOMIS FOCUSED GRWTH | $294.9M | 7,487,001 | 0.40% | — |
| SPGI | S&P GLOBAL | $286.9M | 674,466 | 0.39% | — |
| PYPL | PAYPAL HOLDINGS INC | $286.2M | 6,327,407 | 0.39% | — |
| WDAY | WORKDAY INC | $270.1M | 2,079,300 | 0.36% | — |
| TSM | TAIWAN SEMICONDUCTOR ADR | $221.1M | 654,098 | 0.30% | — |
| HLT | HILTON WORLDWIDE HOLDINGS IN | $220.7M | 725,695 | 0.30% | — |
| PH | PARKER HANNIFIN | $218.6M | 244,154 | 0.29% | — |
| TT | TRANE TECHNOLOGIES PLC | $211.5M | 507,505 | 0.28% | — |
| YUMC | YUM CHINA HOLDINGS INC | $209.5M | 4,293,911 | 0.28% | — |
| BLK | BLACKROCK INC | $201.5M | 209,554 | 0.27% | — |
| ORLY | O'REILLY AUTOMOTIVE INC COMMON STO | $194.6M | 2,107,746 | 0.26% | — |
| COST | COSTCO WHOLESALE CORP | $192.0M | 192,642 | 0.26% | — |
| JPM | JP MORGAN CHASE & CO | $188.4M | 640,498 | 0.25% | — |
| KLAC | KLA-TENCOR CORPORATION | $183.7M | 124,783 | 0.25% | — |
| ECHO 3.875 11/30/30 | ECHOSTAR CORP CVT | $183.1M | 1,563,885 | 0.25% | — |
| CMI | CUMMINS ENGINE | $180.5M | 335,571 | 0.24% | — |
| GS | GOLDMAN SACHS GROUP | $180.4M | 213,185 | 0.24% | — |
| ALNY | ALNYLAM PHARMACEUTICALS INC | $169.4M | 512,097 | 0.23% | — |
| MELI | MERCADOLIBRE INC | $157.7M | 91,225 | 0.21% | — |
| LIN | LINDE PLC | $153.2M | 309,005 | 0.21% | — |
| ROP | ROPER TECHNOLOGIES INC | $152.8M | 431,779 | 0.21% | — |
| HD | HOME DEPOT | $151.0M | 459,052 | 0.20% | — |
| PGR | PROGRESSIVE CORP | $150.8M | 760,877 | 0.20% | — |
| ABNB | AIRBNB INC | $142.0M | 1,124,819 | 0.19% | — |
| MTD | METTLER-TOLEDO INTERNATIONAL | $135.5M | 107,446 | 0.18% | — |
| ARM | ARM HOLDINGS PLC | $130.1M | 860,262 | 0.18% | — |
| RBC | RBC BEARINGS INC | $110.8M | 204,032 | 0.15% | — |
| AEIS | ADVANCED ENERGY INDS | $108.5M | 336,351 | 0.15% | — |
| DHR | DANAHER CORP | $105.6M | 556,853 | 0.14% | — |
| ATI | ALLEGHENY TECHNOLOGIES INC | $95.0M | 653,416 | 0.13% | — |
| EXPE | EXPEDIA INC | $90.4M | 391,396 | 0.12% | — |
| MAREX GROUP PLC | MAREX GROUP PLC | $85.5M | 1,918,622 | 0.12% | — |
| ESE | ESCO TECHNOLOGIES | $84.6M | 300,753 | 0.11% | — |
| ACA | ARCOSA INC | $84.2M | 793,076 | 0.11% | — |
| HQY | HEALTHEQUITY INC | $77.9M | 931,906 | 0.10% | — |
| SUPN | SUPERNUS PHARMACEUTICALS INC | $73.7M | 1,425,779 | 0.10% | — |
| MTSI | MA-COM TECHNOLOGY SOLUTIONS | $71.6M | 322,459 | 0.10% | — |
| LGND | LIGAND PHARMACEUTICALS CL B | $70.5M | 353,209 | 0.09% | — |
| AIR | AAR CORP | $69.9M | 638,885 | 0.09% | — |
| LTH | LIFE TIME GROUP HOLDINGS INC | $69.6M | 2,582,571 | 0.09% | — |
| BABA | ALIBABA GROUP HOLDING-SP ADR | $69.4M | 553,109 | 0.09% | — |
| MGY | MAGNOLIA OIL & GAS CORP - A | $68.8M | 2,179,644 | 0.09% | — |
| ITT | ITT INC | $66.2M | 347,514 | 0.09% | — |
| STRL | STERLING CONSTRUCTION CO | $65.9M | 161,706 | 0.09% | — |
| HXL | HEXCEL CORP | $65.2M | 805,513 | 0.09% | — |
| TYL | TYLER TECHNOLOGIES INC | $65.0M | 189,857 | 0.09% | — |
| ALKS | ALKERMES INC | $63.1M | 1,784,581 | 0.08% | — |
| MOG/A | MOOG INC CL A | $61.8M | 211,063 | 0.08% | — |
| OII | OCEANEERING INTL INC | $60.3M | 1,700,289 | 0.08% | — |
| ROAD | CONSTRUCTION PARTNERS INC-A | $60.2M | 541,842 | 0.08% | — |
| ABEV | AMBEV SA-SPN ADR | $59.8M | 20,490,631 | 0.08% | — |
| RMBS | RAMBUS INC | $56.8M | 659,835 | 0.08% | — |
| BOOT | BOOT BARN HOLDINGS INC | $56.2M | 383,856 | 0.08% | — |
| CIGI | COLLIERS INTERNATIONAL GROUP INC | $53.8M | 503,293 | 0.07% | — |
| ALGM | ALLEGRO MICROSYSTEMS INC | $52.8M | 1,674,108 | 0.07% | — |
| TTMI | TTM TECHNOLOGIES | $52.2M | 535,996 | 0.07% | — |
| COCO | VITA COCO CO INC/THE | $51.4M | 1,072,649 | 0.07% | — |
| LGN | LEGENCE CORP-CL A | $50.9M | 900,657 | 0.07% | — |
| OSIS | OSI SYSTEMS INC | $50.8M | 191,467 | 0.07% | — |
| ECG | EVERUS CONSTRUCTION GROUP | $50.8M | 430,548 | 0.07% | — |
| PATK | PATRICK INDUSTRIES INC | $50.0M | 450,224 | 0.07% | — |
| SF | STIFEL FINANCIAL CORP | $49.8M | 673,597 | 0.07% | — |
| MIR | MIRION TECHNOLOGIES INC | $49.6M | 2,670,228 | 0.07% | — |
| TXRH | TEXAS ROADHOUSE INC CLASS A | $48.7M | 294,637 | 0.07% | — |
| TCOM | TRIP.COM GROUP LTD | $48.6M | 976,211 | 0.07% | — |
| CWST | CASELLA WASTE SYSTEMS INC CL A | $48.3M | 608,654 | 0.06% | — |
| YETI | YETI HOLDINGS INC | $48.2M | 1,316,095 | 0.06% | — |
| MYRG | MYR GROUP INC/DELAWARE | $48.0M | 170,059 | 0.06% | — |
| SNX | SYNNEX CORP | $47.5M | 281,818 | 0.06% | — |
| DOCS | DOXIMITY INC-CLASS A | $47.5M | 2,036,984 | 0.06% | — |
| FBK | FB FINANCIAL CORP | $47.4M | 912,604 | 0.06% | — |
| MRCY | MERCURY COMPUTER SYSTEMS INC | $47.1M | 645,932 | 0.06% | — |
| SLAB | SILICON LABS INC | $46.5M | 223,342 | 0.06% | — |
| CRSP | CRISPR THERAPEUTICS AG | $46.1M | 968,135 | 0.06% | — |
| GKOS | GLAUKOS CORP | $45.4M | 421,240 | 0.06% | — |
| UNH | UNITEDHEALTH GROUP | $45.1M | 166,589 | 0.06% | — |
| VEEV | VEEVA SYSTEMS INC-CLASS A | $44.9M | 255,396 | 0.06% | — |
| VSEC | VSE CORP | $44.7M | 242,376 | 0.06% | — |
| ONESPAWORLD HOLDINGS LTD | ONESPAWORLD HOLDINGS LTD | $44.4M | 1,934,839 | 0.06% | — |
| MIRM | MIRUM PHARMACEUTICALS INC | $43.9M | 475,324 | 0.06% | — |
| DAN | DANA HOLDING CORP | $43.8M | 1,302,384 | 0.06% | — |
| MGRC | MCGRATH RENTCORP | $43.7M | 396,563 | 0.06% | — |
| IRTC | IRHYTHM TECHNOLOGIES INC | $43.4M | 367,894 | 0.06% | — |
| AXSM | AXSOME THERAPEUTICS INC | $43.4M | 256,625 | 0.06% | — |
| ENSG | ENSIGN GROUP INC/THE | $41.5M | 206,125 | 0.06% | — |
| PJT | PJT PARTNERS INC - A | $41.3M | 295,584 | 0.06% | — |
| CALX | CALIX INC | $41.2M | 840,197 | 0.06% | — |
| PIPR | PIPER SANDLER COS | $41.1M | 536,352 | 0.06% | — |
| EXTR | EXTREME NETWORKS INC | $41.0M | 2,715,683 | 0.06% | — |
| RYTM | RHYTHM PHARMACEUTICALS INC | $40.4M | 465,102 | 0.05% | — |
| VNOM | VIPER ENERGY PARTNERS LP | $40.4M | 859,421 | 0.05% | — |
| BMRN | BIOMARIN PHARMACEUTICAL INC | $40.3M | 713,795 | 0.05% | — |
| WHD | CACTUS INC-CLASS A | $40.0M | 843,693 | 0.05% | — |
| VIAV | VIAVI SOLUTION INC | $39.2M | 1,176,860 | 0.05% | — |
| JAZZ | JAZZ PHARMACEUTICALS PLC | $38.9M | 205,905 | 0.05% | — |
| LOPE | GRAND CANYON EDUCATION INC | $38.9M | 228,530 | 0.05% | — |
| BWXT | BWX TECHNOLOGIES INC | $38.7M | 189,244 | 0.05% | — |
| SSB | SOUTHSTATE BANK CORP | $38.5M | 416,233 | 0.05% | — |
| RDNT | RADNET INC | $38.4M | 686,215 | 0.05% | — |
| CASY | CASEYS GENERAL STORES INC | $37.7M | 51,829 | 0.05% | — |
| ALHC | ALIGNMENT HEALTHCARE INC | $37.1M | 2,106,068 | 0.05% | — |
| PB | PROSPERITY BANCSHARES INC | $36.4M | 541,133 | 0.05% | — |
| AORT | ARTIVION INC | $35.9M | 980,439 | 0.05% | — |
| FTI | TECHNIPFMC PLC | $35.8M | 518,372 | 0.05% | — |
| HOMB | HOME BANCSHARES INC | $35.6M | 1,321,846 | 0.05% | — |
| SOLS | SOLSTICE ADVANCED MATERIALS | $35.6M | 467,035 | 0.05% | — |
| CIEN | CIENA CORP | $35.5M | 91,313 | 0.05% | — |
| NXPI | NXP SEMICONDUCTORS NV | $35.2M | 178,586 | 0.05% | — |
| GRDN | GUARDIAN PHRMCY SERVICES-A | $35.1M | 931,689 | 0.05% | — |
| RGA | REINSURANCE GRP OF AMERI-A | $35.0M | 171,484 | 0.05% | — |
| UGI | UGI CORP | $34.5M | 946,556 | 0.05% | — |
| AD | ARRAY DIGITAL INFRASTRUCTURE I | $34.2M | 740,481 | 0.05% | — |
| PTCT | PTC THERAPEUTICS INC | $33.6M | 493,603 | 0.05% | — |
| MSCI | MSCI INC | $33.6M | 62,356 | 0.05% | — |
| VNT | VONTIER CORP | $33.4M | 942,653 | 0.04% | — |
| OPCH | OPTION CARE HEALTH INC | $33.3M | 1,237,747 | 0.04% | — |
This table is the 150 largest positions by value, out of 718 reported. The search box only searches what is on this page — a name absent from it may still be in the filing further down the book. The full info table is here.
Rows are aggregated by CUSIP — a manager files the same security multiple times when different internal desks hold it. Tickers link to our own backtest of that asset where we cover it.
Read the original
This page was built from one document: the 2026-03-31 Form 13F info table filed by LOOMIS SAYLES & CO L P (CIK 312348, accession 0000312348-26-000026). Every other 13F site is reading the same file.
If anything here disagrees with it, the filing wins — and we would want to know. All 13F filings by this manager
What a 13F cannot show you
A 13F is a long-only equity snapshot, and the holes in it are structural. Anyone selling you this data as "what the smart money is doing" is selling you one leg of a position:
- No short positions. None, ever. A fund shown here as bullish may be net short the same name through a book you cannot see.
- No cash, bonds, FX, commodities or non-US listings. A macro fund's entire thesis can be invisible.
- No intra-quarter round trips. Bought and sold inside the same quarter means it never appears at all.
- Options are notional, not ownership. We keep puts and calls in a separate bucket rather than adding their notional into a fund's book size, which is how a $2B fund gets reported as a $20B one.
- Confidential treatment. Managers can ask the SEC to withhold a position while they build it. Those holdings are legally absent from the filing, so a "new" position may be months old.
Tested and published by IndicatorEdge · backtest grid generated 2026-06-25 · base rates recomputed 2026-07-31 · how we test
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