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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$127B
AUM Growth
+$5.5B
Cap. Flow
+$559M
Cap. Flow %
0.44%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,401
Increased
3,688
Reduced
3,363
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 Miscellaneous 98.25%
2 Technology 0.44%
3 Consumer Discretionary 0.32%
4 Healthcare 0.22%
5 Financials 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MASS icon
9326
908 Devices
MASS
$415M
– –
-392
Closed -$2.71K
MATW icon
9327
Matthews International
MATW
$660M
– –
-214
Closed -$9K
MATW icon
9328
PUT
Matthews International
MATW
$660M
– –
-400
Closed -$17K
MBC icon
9329
CALL
MasterBrand
MBC
$1.73B
– –
-1,200
Closed -$13K
MBC icon
9330
MasterBrand
MBC
$1.73B
– –
-1,364
Closed -$15K
MBC icon
9331
PUT
MasterBrand
MBC
$1.73B
– –
-300
Closed -$3K
MBOT icon
9332
CALL
Microbot Medical
MBOT
$96.7M
– –
-1,300
Closed -$3K
MBOT icon
9333
Microbot Medical
MBOT
$96.7M
– –
-1,506
Closed -$4K
MBOT icon
9334
PUT
Microbot Medical
MBOT
$96.7M
– –
-2,000
Closed -$5K
MBUU icon
9335
Malibu Boats
MBUU
$549M
– –
-200
Closed -$10.7K
MCRI icon
9336
Monarch Casino & Resort
MCRI
$2.18B
$0 ﹤0.01%
+13
New +$876
MCW
9337
DELISTED
Mister Car Wash
MCW
– –
-21,400
Closed -$163K
MCY icon
9338
Mercury Insurance
MCY
$5.79B
– –
-493
Closed -$14.5K
MCY icon
9339
PUT
Mercury Insurance
MCY
$5.79B
– –
-1,900
Closed -$57K
MD icon
9340
Pediatrix Medical
MD
$2.2B
– –
-3,576
Closed -$49.1K
MD icon
9341
PUT
Pediatrix Medical
MD
$2.2B
– –
-2,800
Closed -$39K
MDT icon
9342
Medtronic
MDT
$120B
– –
-23,255
Closed -$1.95M
MEC icon
9343
CALL
Mayville Engineering Co
MEC
$501M
– –
-7,100
Closed -$88K
MEDP icon
9344
PUT
Medpace
MEDP
$16.5B
– –
-100
Closed -$24K
MEOH icon
9345
Methanex
MEOH
$4.54B
– –
-632
Closed -$27.1K
META icon
9346
Meta Platforms (Facebook)
META
$1.57T
– –
-1,000
Closed -$301K
MGNI icon
9347
Magnite
MGNI
$3.46B
– –
-24,057
Closed -$259K
MGNX icon
9348
CALL
MacroGenics
MGNX
$280M
– –
-25,400
Closed -$135K
MGPI icon
9349
PUT
MGP Ingredients
MGPI
$351M
– –
-100
Closed -$10K
MGY icon
9350
Magnolia Oil & Gas
MGY
$6.35B
– –
-5,431
Closed -$121K
372 373
374
375 376

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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's Q3 2023 filing shows 1,401 new, 3,688 increased, 3,363 reduced and 1,719 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • 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 1,401 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.