We are live on ! Find out more
Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
-4.08%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MASS icon
9326
908 Devices
MASS
$292M
– –
-392
Closed -$2.71K
MATW icon
9327
Matthews International
MATW
$844M
– –
-214
Closed -$9K
MATW icon
9328
PUT
Matthews International
MATW
$844M
– –
-400
Closed -$17K
MBC icon
9329
CALL
MasterBrand
MBC
$1.08B
– –
-1,200
Closed -$13K
MBC icon
9330
MasterBrand
MBC
$1.08B
– –
-1,364
Closed -$15K
MBC icon
9331
PUT
MasterBrand
MBC
$1.08B
– –
-300
Closed -$3K
MBOT icon
9332
CALL
Microbot Medical
MBOT
$118M
– –
-1,300
Closed -$3K
MBOT icon
9333
Microbot Medical
MBOT
$118M
– –
-1,506
Closed -$4K
MBOT icon
9334
PUT
Microbot Medical
MBOT
$118M
– –
-2,000
Closed -$5K
MBUU icon
9335
Malibu Boats
MBUU
$535M
– –
-200
Closed -$10.7K
MCRI icon
9336
Monarch Casino & Resort
MCRI
$2.12B
$0 ﹤0.01%
+13
New +$876
MCW
9337
DELISTED
Mister Car Wash
MCW
– –
-21,400
Closed -$163K
MCY icon
9338
Mercury Insurance
MCY
$5.84B
– –
-493
Closed -$14.5K
MCY icon
9339
PUT
Mercury Insurance
MCY
$5.84B
– –
-1,900
Closed -$57K
MD icon
9340
Pediatrix Medical
MD
$2.1B
– –
-3,576
Closed -$49.1K
MD icon
9341
PUT
Pediatrix Medical
MD
$2.1B
– –
-2,800
Closed -$39K
MDT icon
9342
Medtronic
MDT
$105B
– –
-23,255
Closed -$1.95M
MEC icon
9343
CALL
Mayville Engineering Co
MEC
$775M
– –
-7,100
Closed -$88K
MEDP icon
9344
PUT
Medpace
MEDP
$17.3B
– –
-100
Closed -$24K
MEOH icon
9345
Methanex
MEOH
$4.49B
– –
-632
Closed -$27.1K
META icon
9346
Meta Platforms (Facebook)
META
$1.54T
– –
-1,000
Closed -$301K
MGNI icon
9347
Magnite
MGNI
$2.57B
– –
-24,057
Closed -$259K
MGNX icon
9348
CALL
MacroGenics
MGNX
$255M
– –
-25,400
Closed -$135K
MGPI icon
9349
PUT
MGP Ingredients
MGPI
$377M
– –
-100
Closed -$10K
MGY icon
9350
Magnolia Oil & Gas
MGY
$4.73B
– –
-5,431
Closed -$121K
372 373
374
375 376

Similar funds

Mitsubishi UFJ Asset Management
Mitsubishi UFJ Asset Management Tokyo, Japan $149B AUM 24.71% 1-Year Est. Return
Creative Planning
Creative Planning Overland Park, Kansas $147B AUM 18.73% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $154B AUM 29.96% 1-Year Est. Return
Canada Pension Plan Investment Board
Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $155B AUM 29.93% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $156B AUM 27.51% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return

Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.