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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
-0.41%
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
$1.25B
AUM Growth
-$22.5M
Cap. Flow
-$16M
Cap. Flow %
-1.28%
Top 10 Hldgs %
17.26%
Holding
7,084
New
1,678
Increased
2,214
Reduced
1,528
Closed
1,505

Top Buys

Rank Stock Value
1
AVGO icon
Broadcom
AVGO
+$33.7M
2
GLD icon
SPDR Gold Trust
GLD
+$17.8M
3
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$14.3M
4
MDY icon
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
+$11.9M
5
C icon
Citigroup
C
+$8.7M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$34.2M
2
GMCR
KEURIG GREEN MTN INC
GMCR
+$17.9M
3
CMG icon
Chipotle Mexican Grill
CMG
+$14.7M
4
DIS icon
Walt Disney
DIS
+$13.3M
5
BKNG icon
Booking.com
BKNG
+$12.1M

Sector Composition

Rank Sector Weight
1 Technology 7.64%
2 Communication Services 6.85%
3 Consumer Discretionary 4.92%
4 Healthcare 4.57%
5 Financials 4.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MCD icon
5951
McDonald's
MCD
$188B
– –
-43,332
Closed -$5.18M
MCHP icon
5952
Microchip Technology
MCHP
$42.8B
– –
-5,736
Closed -$128K
MCRB icon
5953
Seres Therapeutics
MCRB
$48.9M
– –
-1
Closed –
MCY icon
5954
CALL
Mercury Insurance
MCY
$5.92B
– –
-2
Closed -$1K
MDGL icon
5955
Madrigal Pharmaceuticals
MDGL
$12.5B
$0 ﹤0.01%
+11
New +$92
MDGL icon
5956
PUT
Madrigal Pharmaceuticals
MDGL
$12.5B
– –
0
– -$8K
MDIV icon
5957
PUT
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$429M
– –
-5
Closed -$1K
MET icon
5958
MetLife
MET
$60.2B
– –
-24,610
Closed -$920K
MFA
5959
MFA Financial
MFA
$931M
– –
-125
Closed -$3K
MGPI icon
5960
PUT
MGP Ingredients
MGPI
$380M
– –
-141
Closed -$3K
MIDD icon
5961
PUT
Middleby
MIDD
$6.04B
– –
-35
Closed -$14K
MIDU icon
5962
Direxion Daily Mid Cap Bull 3X ETF
MIDU
$73.8M
– –
-794
Closed -$16K
MIND icon
5963
CALL
MIND Technology
MIND
$51M
– –
-2
Closed -$1K
MITK icon
5964
PUT
Mitek Systems
MITK
$769M
– –
-15
Closed -$2K
MITT
5965
TPG Mortgage Investment Trust
MITT
$232M
– –
-345
Closed -$12.6K
MLCO icon
5966
Melco Resorts & Entertainment
MLCO
$2.11B
– –
-16,615
Closed -$252K
MLI icon
5967
Mueller Industries
MLI
$14.1B
– –
-8
Closed –
MLM icon
5968
Martin Marietta Materials
MLM
$33.6B
– –
-330
Closed -$45.4K
MRSH
5969
Marsh
MRSH
$85.7B
– –
-4,675
Closed -$262K
MMLP icon
5970
Martin Midstream Partners
MMLP
$95.5M
– –
-407
Closed -$7.05K
MMLP icon
5971
PUT
Martin Midstream Partners
MMLP
$95.5M
– –
-7
Closed -$4K
MMM icon
5972
3M
MMM
$87.8B
– –
-5,011
Closed -$644K
MMYT icon
5973
MakeMyTrip
MMYT
$4.68B
– –
-21,493
Closed -$368K
MNKD icon
5974
MannKind Corp
MNKD
$1.29B
$0 ﹤0.01%
+2
New +$11
MNRO icon
5975
Monro
MNRO
$526M
– –
-1,926
Closed -$127K
237 238
239
240 241

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Simplex Trading's Q1 2016 Portfolio in Review

As of Q1 2016, Simplex Trading held 7,084 positions worth $1.25B, down 1.8% from $1.28B the previous quarter. Its ten largest holdings account for 17% of the portfolio.

Simplex Trading's Q1 2016 filing shows 1,678 new, 2,214 increased, 1,528 reduced and 1,505 closed positions. Its largest new stake was Broadcom: 2,493,400 shares worth $38.5M. The largest sale was Apple, an estimated $34.2M.

By sector, the portfolio is most concentrated in Technology at 7.6% of assets, up from 7% a quarter earlier, followed by Communication Services and Consumer Discretionary.

  • Simplex Trading's largest Q1 2016 buy was Broadcom: 2,493,400 shares worth $38.5M.
  • Simplex Trading added most to Citigroup in Q1 2016, an estimated $8.7M increase.
  • Simplex Trading's biggest Q1 2016 reduction was Booking.com, cutting an estimated $12.1M.
  • Simplex Trading fully exited Apple in Q1 2016, selling an estimated $34.2M.
  • Simplex Trading's ten largest holdings make up 17% of its $1.25B portfolio in Q1 2016.
  • Simplex Trading opened 1,678 new positions and closed 1,505 in Q1 2016.
  • Simplex Trading's portfolio value fell 1.8% quarter-over-quarter to $1.25B.

Based on Simplex Trading's 13F filing for Q1 2016, filed 14 Apr 2016.