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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
+6.28%
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
$91.9B
AUM Growth
+$3.47B
Cap. Flow
+$1.91B
Cap. Flow %
2.08%
Top 10 Hldgs %
34.1%
Holding
11,206
New
1,219
Increased
3,365
Reduced
4,370
Closed
1,942

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$170M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$71.3M
3
T icon
AT&T
T
+$44.2M
4
META icon
Meta Platforms (Facebook)
META
+$37.1M
5
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$34.4M

Top Sells

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$94.3M
2
JPM icon
JPMorgan Chase
JPM
+$68.2M
3
C icon
Citigroup
C
+$62.8M
4
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$50.9M
5
GLD icon
SPDR Gold Trust
GLD
+$46.3M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.38%
2 Technology 0.35%
3 Communication Services 0.24%
4 Healthcare 0.2%
5 Consumer Staples 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ARKO icon
9126
PUT
ARKO Corp
ARKO
$890M
– –
-4,800
Closed -$45K
ARLO icon
9127
PUT
Arlo Technologies
ARLO
$1.4B
– –
-1,100
Closed -$5K
ARLP icon
9128
Alliance Resource Partners
ARLP
$3.18B
– –
-52,011
Closed -$1.18M
AROC icon
9129
Archrock
AROC
$6.33B
– –
-6,204
Closed -$49.7K
ARQT icon
9130
Arcutis Biotherapeutics
ARQT
$3.42B
– –
-711
Closed -$12.4K
ARQT icon
9131
PUT
Arcutis Biotherapeutics
ARQT
$3.42B
– –
-600
Closed -$11K
ARRY icon
9132
Array Technologies
ARRY
$818M
– –
-33,433
Closed -$635K
ARVN icon
9133
Arvinas
ARVN
$518M
– –
-2,071
Closed -$87.1K
ARWR icon
9134
Arrowhead Research
ARWR
$12.1B
– –
-3,222
Closed -$107K
ASA
9135
CALL
ASA Gold and Precious Metals
ASA
$948M
– –
-600
Closed -$7K
ARW icon
9136
Arrow Electronics
ARW
$10.9B
– –
-63
Closed -$6.5K
ARW icon
9137
PUT
Arrow Electronics
ARW
$10.9B
– –
-200
Closed -$18K
ASB icon
9138
PUT
Associated Banc-Corp
ASB
$5.81B
– –
-400
Closed -$8K
ASEA icon
9139
Global X FTSE Southeast Asia ETF
ASEA
$97.8M
– –
-2,615
Closed -$35K
ASHS icon
9140
Xtrackers Harvest CSI 500 China A-Shares Small Cap ETF
ASHS
$32.6M
– –
-1,126
Closed -$32K
ASIX icon
9141
AdvanSix
ASIX
$567M
– –
-261
Closed -$9.78K
ASIX icon
9142
PUT
AdvanSix
ASIX
$567M
– –
-2,000
Closed -$64K
ASMB icon
9143
Assembly Biosciences
ASMB
$506M
– –
-225
Closed -$3.85K
ASML icon
9144
ASML
ASML
$675B
– –
-18,373
Closed -$9.62M
ASRT
9145
DELISTED
Assertio
ASRT
– –
-855
Closed -$37.6K
ASRV icon
9146
CALL
AmeriServ Financial
ASRV
$73.6M
– –
-1,400
Closed -$5K
ASTE icon
9147
CALL
Astec Industries
ASTE
$1.3B
– –
-800
Closed -$24K
ASX icon
9148
ASE Group
ASX
$80.8B
– –
-1,147
Closed -$6.72K
ATEX icon
9149
PUT
Anterix
ATEX
$1.83B
– –
-200
Closed -$7K
ATLC icon
9150
Atlanticus Holdings
ATLC
$1.5B
– –
-97
Closed -$2.59K
364 365
366
367 368

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Simplex Trading's Q4 2022 Portfolio in Review

As of Q4 2022, Simplex Trading held 11,206 positions worth $91.9B, up 3.9% from $88.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.

Simplex Trading's Q4 2022 filing shows 1,219 new, 3,365 increased, 4,370 reduced and 1,942 closed positions. Its largest new stake was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M. The largest sale was Microsoft, an estimated $94.3M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.38% of assets, up from 0.3% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q4 2022 buy was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M.
  • Simplex Trading added most to Amazon in Q4 2022, an estimated $170M increase.
  • Simplex Trading's biggest Q4 2022 reduction was Microsoft, cutting an estimated $94.3M.
  • Simplex Trading fully exited JPMorgan Chase in Q4 2022, selling an estimated $68.2M.
  • Simplex Trading's ten largest holdings make up 34% of its $91.9B portfolio in Q4 2022.
  • Simplex Trading opened 1,219 new positions and closed 1,942 in Q4 2022.
  • Simplex Trading's portfolio value rose 3.9% quarter-over-quarter to $91.9B.

Based on Simplex Trading's 13F filing for Q4 2022, filed 2 Feb 2023.