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MARSHALL WACE, LLP — 13F Holdings & Portfolio

CIK 1318757 · latest 13F-HR filed 2026-08-13

Backtest portfolio

MARSHALL WACE, LLP manages $126.70B in 13F-reported U.S. long-equity assets across 6,550 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are IVV (13.43%), IVV (9.06%), SPYM (1.79%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 687 new positions, exited 649, added to 1,041, and trimmed 897.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Filer Information
Address
GEORGE HOUSE
131 SLOANE STREET
LONDON, X0 SW1X 9AT
Phone
44-207-316-2251
Filing Manager
MARSHALL WACE, LLP
LONDON, X0
Signatory
Eric Siegel
Operations Manager
Loading holdings…
AUM

$126.70B

Long-equity book

Holdings

6,550

Distinct positions

Period

2026-06-30

Filed 2026-08-13

Q/Q Activity

+687 / −649 / ↑1041 / ↓897

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • ISHARES-S&P 500$12.66B +73.7%
  • ADV MICRO DEVICE$1.49B +193.5%
  • MICRON TECH$1.25B +411.2%
  • COSTCO WHOLESALE$835.9M +318.1%
  • ABBVIE INC$752.3M +326014.7%
Show all 1041 →

Top Trims

  • NVIDIA CORP-$654.2M -27.5%
  • MERCADOLIBRE INC-$534.9M -98.3%
  • CHEVRON CORP-$443.5M -51.3%
  • PFIZER INC-$432.3M -95.7%
  • CIRCLE INTERNET-$371.7M -67.2%
Show all 897 →

New Positions

  • LPL FINANCIAL HO$274.8M
  • HUMANA INC$216.9M
  • REPUBLIC SVCS$196.0M
  • WINGSTOP INC$166.7M
  • INVESCO S&P 500$149.7M
Show all 687 →

Exited Positions

  • MERCK & CO$334.2M
  • SEMPRA$132.0M
  • INSULET CORP$127.3M
  • ROCKET LAB CORP$120.8M
  • KIMBERLY-CLARK$114.1M
Show all 649 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ISHARES-S&P 500 IVV 464287200 $17.01B 13.43% 22,714,278 SH
2 ISHARES-S&P 500 IVV 464287200 $11.48B 9.06% 15,324,187 SH
3 SPDR PORTFOLIO L SPYM 78464A854 $2.26B 1.79% 25,770,487 SH
4 SPDR PORTFOLIO L SPYM 78464A854 $1.81B 1.43% 20,545,659 SH
5 ADV MICRO DEVICE AMD 007903107 $1.44B 1.14% 2,482,700 SH
6 ISHARES-S&P 500 IVV 464287200 $1.29B 1.01% 1,716,119 SH
7 APPLE INC AAPL 037833100 $1.21B 0.95% 4,170,171 SH
8 NVIDIA CORP NVDA 67066G104 $1.08B 0.85% 5,399,013 SH
9 AMAZON.COM INC AMZN 023135106 $1.08B 0.85% 4,524,462 SH
10 MICRON TECH MU 595112103 $973.9M 0.77% 843,719 SH
11 APPLE INC AAPL 037833100 $755.8M 0.60% 2,611,988 SH
12 TESLA INC TSLA 88160R101 $659.6M 0.52% 1,568,192 SH
13 COSTCO WHOLESALE COST 22160K105 $586.3M 0.46% 626,759 SH
14 MICROSOFT CORP MSFT 594918104 $575.6M 0.45% 1,543,158 SH
15 NVIDIA CORP NVDA 67066G104 $531.9M 0.42% 2,658,089 SH
16 AMAZON.COM INC AMZN 023135106 $520.3M 0.41% 2,183,139 SH
17 TAIWAN SEMIC-ADR TSM 874039100 $477.8M 0.38% 1,000,493 SH
18 AMAZON.COM INC AMZN 023135106 $465.2M 0.37% 1,951,878 SH
19 ALPHABET INC-A GOOGL 02079K305 $445.2M 0.35% 1,245,695 SH
20 APPLE INC AAPL 037833100 $445.2M 0.35% 1,538,440 SH
21 ADV MICRO DEVICE AMD 007903107 $399.0M 0.31% 686,911 SH
22 UNITEDHEALTH GRP UNH 91324P102 $396.9M 0.31% 954,967 SH
23 MORGAN STANLEY MS 617446448 $392.0M 0.31% 1,875,270 SH
24 JOHNSON&JOHNSON JNJ 478160104 $388.2M 0.31% 1,528,568 SH
25 COCA-COLA CO/THE KO 191216100 $381.4M 0.30% 4,693,364 SH
26 BLOOM ENERGY C-A BE 093712107 $362.5M 0.29% 1,197,624 SH
27 MORGAN STANLEY MS 617446448 $361.8M 0.29% 1,730,598 SH
28 JP MORGAN CHASE JPM 46625H100 $359.6M 0.28% 1,098,618 SH
29 MICROSOFT CORP MSFT 594918104 $354.4M 0.28% 950,000 SH
30 ABBVIE INC ABBV 00287Y109 $349.3M 0.28% 1,388,205 SH
31 MARKET VECTORS S Put SMH 92189F676 $348.7M 0.28% 531,700 SH
32 ABBVIE INC ABBV 00287Y109 $348.3M 0.27% 1,384,122 SH
33 JOHNSON&JOHNSON JNJ 478160104 $344.5M 0.27% 1,356,534 SH
34 EXXON MOBIL CORP XOM 30231G102 $327.7M 0.26% 2,397,198 SH
35 ABBOTT LABS ABT 002824100 $324.5M 0.26% 3,576,090 SH
36 IBM IBM 459200101 $320.7M 0.25% 1,140,488 SH
37 AMERICAN EXPRESS AXP 025816109 $318.0M 0.25% 940,238 SH
38 META PLATFORMS-A META 30303M102 $316.9M 0.25% 562,527 SH
39 CISCO SYSTEMS CSCO 17275R102 $313.1M 0.25% 2,665,600 SH
40 CME GROUP INC CME 12572Q105 $310.7M 0.25% 1,406,838 SH
41 BANK OF AMERICA BAC 060505104 $301.1M 0.24% 5,283,644 SH
42 CHEVRON CORP CVX 166764100 $297.6M 0.23% 1,795,354 SH
43 HILTON WORLDWIDE HLT 43300A203 $296.6M 0.23% 897,604 SH
44 MICRON TECH MU 595112103 $288.5M 0.23% 249,945 SH
45 UNITEDHEALTH GRP UNH 91324P102 $286.9M 0.23% 690,324 SH
46 ALPHABET INC-A GOOGL 02079K305 $283.6M 0.22% 793,523 SH
47 TEXAS INSTRUMENT TXN 882508104 $280.8M 0.22% 942,132 SH
48 AUTOMATIC DATA ADP 053015103 $278.7M 0.22% 1,244,497 SH
49 ELI LILLY & CO LLY 532457108 $275.8M 0.22% 229,925 SH
50 MICRON TECH MU 595112103 $269.5M 0.21% 233,480 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-13 $126.70B 6,550 0001318757-26-000010
2026-03-31 2026-05-15 $100.41B 6,623 0001318757-26-000005
2025-12-31 2026-02-13 $109.85B 6,074 0001318757-26-000003
2025-09-30 2025-11-13 $98.60B 5,977 0001318757-25-000046