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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
+2.14%
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
$860M
AUM Growth
+$34.4M
Cap. Flow
-$17.8M
Cap. Flow %
-2.07%
Top 10 Hldgs %
14.96%
Holding
6,670
New
1,973
Increased
1,386
Reduced
1,513
Closed
1,643

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$40.1M
2
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$12.5M
3
BABA icon
Alibaba
BABA
+$10.5M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$9.89M
5
INTC icon
Intel
INTC
+$9.83M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$35.7M
2
GILD icon
Gilead Sciences
GILD
+$32.3M
3
AMZN icon
Amazon
AMZN
+$29M
4
BKNG icon
Booking.com
BKNG
+$28.4M
5
BIDU icon
Baidu
BIDU
+$13.3M

Sector Composition

Rank Sector Weight
1 Communication Services 7.76%
2 Consumer Discretionary 7.62%
3 Healthcare 7.24%
4 Technology 6.95%
5 Financials 4.83%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
NOW icon
3876
PUT
ServiceNow
NOW
$109B
$3K ﹤0.01%
115
-245
-68% -$3.61K
NUE icon
3877
CALL
Nucor
NUE
$56.4B
$3K ﹤0.01%
50
+32
+178% +$1.5K
NUWE icon
3878
PUT
Nuwellis
NUWE
$183K
– –
0
– –
NWPX icon
3879
CALL
NWPX Infrastructure Inc
NWPX
$1.24B
$3K ﹤0.01%
+25
New +$609
OC icon
3880
PUT
Owens Corning
OC
$11.6B
$3K ﹤0.01%
140
-5
-3% -$198
OCSL icon
3881
PUT
Oaktree Specialty Lending
OCSL
$1.04B
$3K ﹤0.01%
+8
New +$180
OFIX icon
3882
CALL
Orthofix Medical
OFIX
$481M
$3K ﹤0.01%
+6
New +$189
OMCL icon
3883
Omnicell
OMCL
$1.89B
$3K ﹤0.01%
+109
New +$3.59K
ORLY icon
3884
PUT
O'Reilly Automotive
ORLY
$75.1B
$3K ﹤0.01%
570
-810
-59% -$10.9K
PAG icon
3885
CALL
Penske Automotive Group
PAG
$14.2B
$3K ﹤0.01%
23
+1
+5% +$49
PGR icon
3886
Progressive
PGR
$125B
$3K ﹤0.01%
+121
New +$3.23K
POR icon
3887
PUT
Portland General Electric
POR
$5.93B
$3K ﹤0.01%
12
+3
+33% +$113
PRLB icon
3888
PUT
Protolabs
PRLB
$1.85B
$3K ﹤0.01%
21
-1
-5% -$68
PTEN icon
3889
CALL
Patterson-UTI
PTEN
$3.57B
$3K ﹤0.01%
+42
New +$720
RARE icon
3890
CALL
Ultragenyx Pharmaceutical
RARE
$2.65B
$3K ﹤0.01%
+6
New +$333
RF icon
3891
PUT
Regions Financial
RF
$26.2B
$3K ﹤0.01%
+21
New +$199
RMBS icon
3892
CALL
Rambus
RMBS
$10.4B
$3K ﹤0.01%
12
-145
-92% -$1.71K
RMTI icon
3893
PUT
Rockwell Medical
RMTI
$27.6M
$3K ﹤0.01%
1
-4
-80% -$4.68K
SAND
3894
PUT
DELISTED
Sandstorm Gold
SAND
$3K ﹤0.01%
12
+11
+1,100% +$39
SBGI icon
3895
CALL
Sinclair Inc
SBGI
$974M
$3K ﹤0.01%
24
-132
-85% -$3.59K
SJNK icon
3896
State Street SPDR Bloomberg Short Term High Yield Bond ETF
SJNK
$4.88B
$3K ﹤0.01%
+122
New +$3.55K
SLM icon
3897
SLM Corp
SLM
$4.78B
$3K ﹤0.01%
+392
New +$3.68K
SRDX
3898
CALL
DELISTED
Surmodics
SRDX
$3K ﹤0.01%
20
– –
SSTK icon
3899
PUT
Shutterstock
SSTK
$216M
$3K ﹤0.01%
+16
New +$972
STNG icon
3900
CALL
Scorpio Tankers
STNG
$3.9B
$3K ﹤0.01%
+1
New +$87
154 155
156
157 158

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Simplex Trading's Q1 2015 Portfolio in Review

As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.

By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
  • Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
  • Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
  • Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
  • Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
  • Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
  • Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.

Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.