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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
FAST icon
3651
CALL
Fastenal
FAST
$55.2B
$4K ﹤0.01%
360
-208
-37% -$2.25K
FCG icon
3652
First Trust Natural Gas ETF
FCG
$609M
$4K ﹤0.01%
84
-394
-82% -$21K
FHI icon
3653
CALL
Federated Hermes
FHI
$4.59B
$4K ﹤0.01%
+11
New +$365
FHN icon
3654
CALL
First Horizon
FHN
$12.3B
$4K ﹤0.01%
+75
New +$1.03K
FTI icon
3655
PUT
TechnipFMC
FTI
$28.9B
$4K ﹤0.01%
9
-26
-74% -$761
FWRD icon
3656
CALL
Forward Air
FWRD
$467M
$4K ﹤0.01%
+8
New +$409
GNE icon
3657
Genie Energy
GNE
$378M
$4K ﹤0.01%
+515
New +$3.47K
GNRC icon
3658
PUT
Generac Holdings
GNRC
$11.5B
$4K ﹤0.01%
33
-25
-43% -$1.19K
GRMN
3659
CALL
Garmin
GRMN
$48.9B
$4K ﹤0.01%
+188
New +$9.6K
GTLS
3660
CALL
DELISTED
Chart Industries
GTLS
$4K ﹤0.01%
35
-24
-41% -$771
GTN icon
3661
CALL
Gray Television
GTN
$430M
$4K ﹤0.01%
17
+4
+31% +$45
GWW icon
3662
CALL
W.W. Grainger
GWW
$66B
$4K ﹤0.01%
41
+16
+64% +$3.82K
H icon
3663
Hyatt Hotels
H
$17.8B
$4K ﹤0.01%
+75
New +$4.39K
HACK icon
3664
PUT
Amplify Cybersecurity ETF
HACK
$2.65B
$4K ﹤0.01%
+32
New +$876
HDB icon
3665
PUT
HDFC Bank
HDB
$121B
$4K ﹤0.01%
264
-36
-12% -$526
HHH icon
3666
CALL
Howard Hughes
HHH
$4B
$4K ﹤0.01%
5
-14
-74% -$1.84K
HMC icon
3667
PUT
Honda
HMC
$39.3B
$4K ﹤0.01%
20
– –
HSIC icon
3668
CALL
Henry Schein
HSIC
$9.76B
$4K ﹤0.01%
43
-62
-59% -$3.4K
IART icon
3669
Integra LifeSciences
IART
$1.54B
$4K ﹤0.01%
+159
New +$3.76K
IDA icon
3670
Idacorp
IDA
$8.24B
$4K ﹤0.01%
+64
New +$4.12K
IJK icon
3671
iShares S&P Mid-Cap 400 Growth ETF
IJK
$10.8B
$4K ﹤0.01%
+104
New +$4.3K
IMKTA icon
3672
PUT
Ingles Markets
IMKTA
$1.71B
$4K ﹤0.01%
+82
New +$3.69K
IRBT
3673
CALL
DELISTED
iRobot
IRBT
$4K ﹤0.01%
23
+6
+35% +$195
JACK icon
3674
CALL
Jack in the Box
JACK
$308M
$4K ﹤0.01%
37
+27
+270% +$2.45K
JCI icon
3675
PUT
Johnson Controls International
JCI
$85.6B
$4K ﹤0.01%
63
-1
-2% -$51
145 146
147
148 149

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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.