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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
+18.73%
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
$55.7B
AUM Growth
-$21.5B
Cap. Flow
-$23.5B
Cap. Flow %
-42.23%
Top 10 Hldgs %
43.23%
Holding
10,706
New
2,258
Increased
3,361
Reduced
3,151
Closed
1,706

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$67.5M
2
PLTR icon
Palantir
PLTR
+$64.7M
3
PARA
Paramount Global Class B
PARA
+$31.5M
4
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$30.7M
5
CCL icon
Carnival Corporation Ltd
CCL
+$25.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
TSLA icon
Tesla
TSLA
+$53.7M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$38.1M
4
QQQ icon
Invesco QQQ Trust
QQQ
+$37.6M
5
AZO icon
AutoZone
AZO
+$28.5M

Sector Composition

Rank Sector Weight
1 Technology 0.65%
2 Consumer Discretionary 0.49%
3 Healthcare 0.32%
4 Financials 0.3%
5 Industrials 0.29%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
COF icon
8951
CALL
Capital One
COF
$124B
– –
-1,783
Closed -$17.6M
COF icon
8952
Capital One
COF
$124B
$0 ﹤0.01%
+26,693
New +$3.14M
COF icon
8953
PUT
Capital One
COF
$124B
– –
-3,376
Closed -$33.4M
COHR icon
8954
Coherent
COHR
$55.2B
– –
-4,147
Closed -$340K
COLD icon
8955
Americold
COLD
$4.09B
– –
-42,533
Closed -$1.53M
COO icon
8956
Cooper Companies
COO
$13.7B
– –
-2,104
Closed -$200K
COP icon
8957
CALL
ConocoPhillips
COP
$147B
– –
-2,281
Closed -$9.12M
COP icon
8958
ConocoPhillips
COP
$147B
$0 ﹤0.01%
121,681
+52,754
+77% +$2.6M
COP icon
8959
PUT
ConocoPhillips
COP
$147B
– –
-3,395
Closed -$13.6M
COST icon
8960
CALL
Costco
COST
$415B
– –
-2,696
Closed -$102M
COST icon
8961
Costco
COST
$415B
$0 ﹤0.01%
+21,401
New +$7.45M
COST icon
8962
PUT
Costco
COST
$415B
– –
-3,060
Closed -$115M
CPA icon
8963
Copa Holdings
CPA
$5.56B
– –
-1,299
Closed -$108K
CPER icon
8964
United States Copper Index Fund
CPER
$742M
– –
-321
Closed -$7.66K
CPSS icon
8965
CALL
Consumer Portfolio Services
CPSS
$205M
– –
-6
Closed -$2K
CRAI icon
8966
CRA International
CRAI
$1.1B
– –
-114
Closed -$6.93K
CRDF icon
8967
Cardiff Oncology
CRDF
$64.3M
– –
-404
Closed -$4.91K
CRESY
8968
CALL
Cresud
CRESY
$794M
– –
-133
Closed -$61K
CRSR icon
8969
Corsair Gaming
CRSR
$1.05B
– –
-33,396
Closed -$1.24M
CSGP icon
8970
CALL
CoStar Group
CSGP
$11.3B
– –
-180
Closed -$1.66M
CSGP icon
8971
CoStar Group
CSGP
$11.3B
– –
-2,110
Closed -$182K
CSGP icon
8972
PUT
CoStar Group
CSGP
$11.3B
– –
-250
Closed -$2.31M
CSGS
8973
CALL
DELISTED
CSG Systems International
CSGS
– –
-151
Closed -$680K
CSIQ icon
8974
CALL
Canadian Solar
CSIQ
$906M
– –
-1,779
Closed -$9.12M
CSIQ icon
8975
Canadian Solar
CSIQ
$906M
$0 ﹤0.01%
28,093
+23,975
+582% +$1.24M
357 358
359
360 361

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Simplex Trading's Q1 2021 Portfolio in Review

As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.

  • Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
  • Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
  • Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
  • Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
  • Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.

Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.