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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
REE
9926
DELISTED
REE Automotive
REE
– –
-1,039
Closed -$13.3K
REAX icon
9927
Real Brokerage
REAX
$364M
$0 ﹤0.01%
129
-300
-70% -$394
REFR icon
9928
CALL
Research Frontiers
REFR
$16.8M
– –
-2,800
Closed -$5K
REI icon
9929
Ring Energy
REI
$333M
– –
-4,039
Closed -$8.71K
REKR icon
9930
Rekor Systems
REKR
$83.1M
– –
-30,795
Closed -$49K
RELX icon
9931
CALL
RELX
RELX
$57.4B
– –
-1,800
Closed -$49K
RES icon
9932
RPC Inc
RES
$1.3B
– –
-13,913
Closed -$124K
RETL icon
9933
Direxion Daily Retail Bull 3X ETF
RETL
$29.3M
– –
-2,865
Closed -$19K
REXR icon
9934
Rexford Industrial Realty
REXR
$8.12B
$0 ﹤0.01%
16
-169
-91% -$10.1K
REYN icon
9935
Reynolds Consumer Products
REYN
$5.31B
– –
-124
Closed -$3.5K
REYN icon
9936
PUT
Reynolds Consumer Products
REYN
$5.31B
– –
-1,300
Closed -$38K
RGLS
9937
DELISTED
Regulus Therapeutics
RGLS
– –
-301
Closed -$398
RGP icon
9938
Resources Connection
RGP
$129M
– –
-142
Closed -$2.49K
RGP icon
9939
PUT
Resources Connection
RGP
$129M
– –
-100
Closed -$1K
RGS icon
9940
PUT
Regis Corp
RGS
$68.8M
– –
-8,310
Closed -$202K
RGTI icon
9941
Rigetti Computing
RGTI
$4.94B
– –
-16,425
Closed -$13.3K
RGTI icon
9942
PUT
Rigetti Computing
RGTI
$4.94B
– –
-3,700
Closed -$2K
RKDA icon
9943
Arcadia Biosciences
RKDA
$1.36M
– –
-6
Closed –
RLI icon
9944
RLI Corp
RLI
$5.62B
– –
-1,534
Closed -$100K
RLJ icon
9945
RLJ Lodging Trust
RLJ
$1.83B
– –
-8,306
Closed -$93.3K
RLMD icon
9946
PUT
Relmada Therapeutics
RLMD
$546M
– –
-8,000
Closed -$27K
RLX icon
9947
RLX Technology
RLX
$2.47B
– –
-185,618
Closed -$450K
RMD icon
9948
ResMed
RMD
$27.8B
– –
-2,953
Closed -$641K
RMNI icon
9949
PUT
Rimini Street
RMNI
$398M
– –
-16,900
Closed -$64K
ROAD icon
9950
Construction Partners
ROAD
$5.88B
– –
-55
Closed -$1.5K
396 397
398
399 400

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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.