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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
MRNA icon
9926
Moderna
MRNA
$21.5B
– –
-42,209
Closed -$6.9M
MRSN
9927
PUT
DELISTED
Mersana Therapeutics
MRSN
– –
-20
Closed -$3K
MRTN icon
9928
CALL
Marten Transport
MRTN
$1.33B
– –
-100
Closed -$1K
MRTN icon
9929
PUT
Marten Transport
MRTN
$1.33B
– –
-6,500
Closed -$124K
MRUS
9930
DELISTED
Merus
MRUS
– –
-653
Closed -$11.5K
MRVI icon
9931
Maravai LifeSciences
MRVI
$997M
$0 ﹤0.01%
25
-15,373
-100% -$242K
MS icon
9932
Morgan Stanley
MS
$337B
– –
-76,477
Closed -$6.52M
MSB
9933
CALL
Mesabi Trust
MSB
$295M
– –
-400
Closed -$8K
MSI icon
9934
Motorola Solutions
MSI
$69.4B
– –
-1,390
Closed -$347K
MT icon
9935
ArcelorMittal
MT
$50.4B
– –
-54,080
Closed -$1.33M
MTDR icon
9936
Matador Resources
MTDR
$6.31B
– –
-2,105
Closed -$133K
MTRX icon
9937
Matrix Service
MTRX
$347M
– –
-470
Closed -$2.43K
MTRX icon
9938
PUT
Matrix Service
MTRX
$347M
– –
-500
Closed -$2K
MTSI icon
9939
MACOM Technology Solutions
MTSI
$20.4B
– –
-213
Closed -$13.3K
MTUM icon
9940
iShares MSCI USA Momentum Factor ETF
MTUM
$25.5B
– –
-1,620
Closed -$212K
MU icon
9941
Micron Technology
MU
$1.04T
– –
-181,130
Closed -$9.91M
MUB icon
9942
iShares National Muni Bond ETF
MUB
$45.1B
– –
-876
Closed -$89K
MUFG icon
9943
PUT
Mitsubishi UFJ Financial
MUFG
$258B
– –
-12,000
Closed -$54K
BINI
9944
DELISTED
Bollinger Innovations
BINI
– –
0
– –
MUX icon
9945
McEwen Inc
MUX
$1.03B
– –
-28,769
Closed -$134K
MXCT icon
9946
CALL
MaxCyte
MXCT
$116M
– –
-2,400
Closed -$15K
MXL icon
9947
MaxLinear
MXL
$6.41B
– –
-1,945
Closed -$65.9K
MYGN icon
9948
CALL
Myriad Genetics
MYGN
$530M
– –
-5,600
Closed -$106K
MYPS icon
9949
PUT
PLAYSTUDIOS Inc
MYPS
$79.3M
– –
-12,000
Closed -$41K
LUXE
9950
CALL
LuxExperience B.V.
LUXE
$1.1B
– –
-100
Closed -$1K
396 397
398
399 400

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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.