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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
MGM icon
9901
MGM Resorts International
MGM
$11.7B
– –
-4,778
Closed -$165K
MGRC icon
9902
CALL
McGrath RentCorp
MGRC
$2.94B
– –
-100
Closed -$8K
KG
9903
CALL
Kestrel Group
KG
$71.3M
– –
-1,505
Closed -$64K
MHO icon
9904
PUT
M/I Homes
MHO
$3.83B
– –
-2,500
Closed -$90K
MIDU icon
9905
Direxion Daily Mid Cap Bull 3X ETF
MIDU
$73.7M
– –
-79
Closed -$2K
MIST icon
9906
PUT
Milestone Pharmaceuticals
MIST
$144M
– –
-183,200
Closed -$1.68M
MKC icon
9907
McCormick & Company Non-Voting
MKC
$13.4B
– –
-159
Closed -$12.8K
MKTX icon
9908
MarketAxess Holdings
MKTX
$4.15B
– –
-2,681
Closed -$690K
MLR icon
9909
Miller Industries
MLR
$586M
– –
-100
Closed -$2K
MLSS icon
9910
CALL
Milestone Scientific
MLSS
$34.5M
– –
-8,200
Closed -$6K
MLSS icon
9911
Milestone Scientific
MLSS
$34.5M
– –
-7,767
Closed -$6K
MMLP icon
9912
Martin Midstream Partners
MMLP
$95.9M
– –
-3,777
Closed -$12.3K
MMS icon
9913
Maximus
MMS
$3.14B
– –
-15,092
Closed -$974K
MNDO icon
9914
CALL
Mind CTI
MNDO
$20.6M
– –
-600
Closed -$1K
MNOV icon
9915
CALL
MediciNova
MNOV
$65M
– –
-700
Closed -$1K
MNOV icon
9916
MediciNova
MNOV
$65M
– –
-44
Closed –
MNST icon
9917
Monster Beverage
MNST
$91.4B
– –
-11,238
Closed -$544K
MNTK icon
9918
PUT
Montauk Renewables
MNTK
$266M
– –
-200
Closed -$3K
MOD icon
9919
Modine Manufacturing
MOD
$12.8B
– –
-15,319
Closed -$284K
ORIO
9920
PUT
Orion Digital Corp
ORIO
$15.4M
– –
-1,933
Closed -$5K
MORN icon
9921
CALL
Morningstar
MORN
$6.56B
– –
-500
Closed -$106K
MORN icon
9922
Morningstar
MORN
$6.56B
– –
-395
Closed -$83K
MORN icon
9923
PUT
Morningstar
MORN
$6.56B
– –
-10,800
Closed -$2.29M
MRAM icon
9924
Everspin Technologies
MRAM
$354M
– –
-2,786
Closed -$16.4K
MRKR icon
9925
Marker Therapeutics
MRKR
$20.3M
$0 ﹤0.01%
16
-136
-89% -$469
395 396
397
398 399

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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.