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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
+$10.1B
Cap. Flow %
8.87%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,665
Reduced
3,633
Closed
1,729

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Technology 0.42%
2 Consumer Discretionary 0.2%
3 Healthcare 0.17%
4 Industrials 0.15%
5 Communication Services 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IMMP
9501
Immutep
IMMP
$56.7M
– –
-2,514
Closed -$4.63K
IMMP
9502
PUT
Immutep
IMMP
$56.7M
– –
-19,300
Closed -$33K
IMXI icon
9503
PUT
International Money Express
IMXI
$392M
– –
-22,600
Closed -$550K
INCR
9504
Intercure
INCR
$55.2M
$0 ﹤0.01%
+100
New +$301
INCY icon
9505
Incyte
INCY
$23.5B
– –
-426
Closed -$33.3K
INFL icon
9506
Horizon Kinetics Inflation Beneficiaries ETF
INFL
$1.5B
$0 ﹤0.01%
+32
New +$999
INFU icon
9507
InfuSystem Holdings
INFU
$184M
$0 ﹤0.01%
+2
New +$18
INGN icon
9508
PUT
Inogen
INGN
$167M
– –
-2,500
Closed -$49K
INMB icon
9509
PUT
INmune Bio
INMB
$43.1M
– –
-1,400
Closed -$8K
INNV icon
9510
CALL
InnovAge Holding
INNV
$1.57B
– –
-1,100
Closed -$7K
INSE icon
9511
Inspired Entertainment
INSE
$177M
– –
-1,732
Closed -$25K
INSE icon
9512
PUT
Inspired Entertainment
INSE
$177M
– –
-2,900
Closed -$36K
INSG icon
9513
Inseego
INSG
$108M
– –
-1,877
Closed -$16.7K
INTT icon
9514
inTEST
INTT
$173M
– –
-104
Closed -$1.56K
INVE icon
9515
Identive
INVE
$64.6M
– –
-55
Closed -$405
INVH icon
9516
Invitation Homes
INVH
$17.7B
– –
-418
Closed -$13.1K
IPG
9517
DELISTED
Interpublic Group of Companies
IPG
– –
-40,273
Closed -$1.45M
IPGP icon
9518
IPG Photonics
IPGP
$3.89B
– –
-74
Closed -$8.57K
IPI icon
9519
Intrepid Potash
IPI
$460M
– –
-116,970
Closed -$3.56M
IPOS icon
9520
PUT
Renaissance International IPO ETF
IPOS
$11.3M
– –
-1,000
Closed -$24K
IR icon
9521
Ingersoll Rand
IR
$33B
– –
-2,189
Closed -$123K
IRIX icon
9522
CALL
IRIDEX
IRIX
$15.5M
– –
-2,600
Closed -$5K
IRIX icon
9523
PUT
IRIDEX
IRIX
$15.5M
– –
-500
Closed -$1K
IRM icon
9524
Iron Mountain
IRM
$38.2B
– –
-31,638
Closed -$1.66M
IRT icon
9525
CALL
Independence Realty Trust
IRT
$3.92B
– –
-3,900
Closed -$65K
379 380
381
382 383

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.

By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.