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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
+26.79%
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
$77.2B
AUM Growth
+$3.66B
Cap. Flow
-$1.09B
Cap. Flow %
-1.41%
Top 10 Hldgs %
42.09%
Holding
9,568
New
1,711
Increased
3,402
Reduced
3,106
Closed
1,157

Top Buys

Rank Stock Value
1
BABA icon
Alibaba
BABA
+$39.9M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$39M
3
MA icon
Mastercard
MA
+$31.3M
4
AAPL icon
Apple
AAPL
+$25.3M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$25.1M

Top Sells

Rank Stock Value
1
JPM icon
JPMorgan Chase
JPM
+$52.8M
2
TSM icon
TSMC
TSM
+$43M
3
AMZN icon
Amazon
AMZN
+$24.7M
4
SLV icon
iShares Silver Trust
SLV
+$24.2M
5
NFLX icon
Netflix
NFLX
+$21.1M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.65%
2 Technology 0.37%
3 Healthcare 0.33%
4 Industrials 0.21%
5 Communication Services 0.19%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MDXG icon
8776
MiMedx Group
MDXG
$623M
$0 ﹤0.01%
+8,245
New +$59.4K
MDY icon
8777
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27.2B
– –
-2,448
Closed -$943K
MESO
8778
Mesoblast
MESO
$1.99B
$0 ﹤0.01%
+6,192
New +$152K
MET icon
8779
MetLife
MET
$60.3B
– –
-21,835
Closed -$946K
MGK icon
8780
Vanguard Mega Cap Growth ETF
MGK
$32.2B
– –
-1,035
Closed -$38K
MGM icon
8781
MGM Resorts International
MGM
$11.8B
$0 ﹤0.01%
308
-144,327
-100% -$3.71M
MGPI icon
8782
PUT
MGP Ingredients
MGPI
$382M
– –
-26
Closed -$103K
MGRC icon
8783
McGrath RentCorp
MGRC
$2.93B
– –
-31
Closed -$1.97K
MGY icon
8784
Magnolia Oil & Gas
MGY
$6.01B
– –
-10
Closed -$60
MGTX icon
8785
MeiraGTx Holdings
MGTX
$1.11B
– –
-100
Closed -$1.41K
MIND icon
8786
CALL
MIND Technology
MIND
$51.2M
– –
-19
Closed -$39K
MIND icon
8787
MIND Technology
MIND
$51.2M
$0 ﹤0.01%
+21
New +$468
MIST icon
8788
Milestone Pharmaceuticals
MIST
$147M
– –
-59
Closed -$395
MIST icon
8789
PUT
Milestone Pharmaceuticals
MIST
$147M
– –
-500
Closed -$366K
MKC icon
8790
McCormick & Company Non-Voting
MKC
$13.6B
– –
-890
Closed -$84K
MKL icon
8791
CALL
Markel Group
MKL
$24.8B
– –
-30
Closed -$2.92M
MKL icon
8792
Markel Group
MKL
$24.8B
– –
-544
Closed -$542K
MKL icon
8793
PUT
Markel Group
MKL
$24.8B
– –
-11
Closed -$1.07M
MLKN icon
8794
MillerKnoll
MLKN
$1.51B
– –
-36,411
Closed -$1.27M
MLR icon
8795
Miller Industries
MLR
$590M
– –
-110
Closed -$3.65K
MMS icon
8796
Maximus
MMS
$3.13B
– –
-1,284
Closed -$91.1K
MMSI icon
8797
CALL
Merit Medical Systems
MMSI
$4.41B
– –
-135
Closed -$587K
MMYT icon
8798
MakeMyTrip
MMYT
$4.67B
– –
-54,176
Closed -$1.23M
MODV
8799
DELISTED
ModivCare
MODV
– –
-557
Closed -$69.1K
MOV icon
8800
CALL
Movado Group
MOV
$817M
– –
-37
Closed -$36K
350 351
352
353 354

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Simplex Trading's Q4 2020 Portfolio in Review

As of Q4 2020, Simplex Trading held 9,568 positions worth $77.2B, up 5% from $73.5B the previous quarter. Its ten largest holdings account for 42% of the portfolio.

Simplex Trading's Q4 2020 filing shows 1,711 new, 3,402 increased, 3,106 reduced and 1,157 closed positions. Its largest new stake was Alibaba: 143,630 shares worth $33.4M. The largest sale was JPMorgan Chase, an estimated $52.8M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.65% of assets, up from 0.53% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q4 2020 buy was Alibaba: 143,630 shares worth $33.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q4 2020, an estimated $39M increase.
  • Simplex Trading's biggest Q4 2020 reduction was JPMorgan Chase, cutting an estimated $52.8M.
  • Simplex Trading fully exited Target in Q4 2020, selling an estimated $14.3M.
  • Simplex Trading's ten largest holdings make up 42% of its $77.2B portfolio in Q4 2020.
  • Simplex Trading opened 1,711 new positions and closed 1,157 in Q4 2020.
  • Simplex Trading's portfolio value rose 5% quarter-over-quarter to $77.2B.

Based on Simplex Trading's 13F filing for Q4 2020, filed 2 Feb 2021.