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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
+5.31%
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
$25.5B
AUM Growth
+$23.2B
Cap. Flow
+$226M
Cap. Flow %
0.89%
Top 10 Hldgs %
29.06%
Holding
8,400
New
2,282
Increased
2,314
Reduced
2,591
Closed
1,035

Top Buys

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$34.5M
2
MU icon
Micron Technology
MU
+$33.9M
3
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$30.8M
4
NVDA icon
NVIDIA
NVDA
+$23.5M
5
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$22.2M

Top Sells

Rank Stock Value
1
TWX
Time Warner Inc
TWX
+$34.8M
2
AMZN icon
Amazon
AMZN
+$31.2M
3
TSLA icon
Tesla
TSLA
+$17.6M
4
NFLX icon
Netflix
NFLX
+$15.5M
5
AMD icon
Advanced Micro Devices
AMD
+$12.9M

Sector Composition

Rank Sector Weight
1 Technology 1.23%
2 Consumer Discretionary 0.92%
3 Communication Services 0.73%
4 Financials 0.62%
5 Industrials 0.6%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
KEY icon
7626
KeyCorp
KEY
$24.4B
– –
-25,134
Closed -$502K
KEYS icon
7627
Keysight
KEYS
$55.6B
– –
-705
Closed -$39.2K
KIE icon
7628
State Street SPDR S&P Insurance ETF
KIE
$606M
– –
-80
Closed -$2K
KLIC icon
7629
Kulicke & Soffa
KLIC
$5.55B
– –
-13,090
Closed -$311K
KLIC icon
7630
PUT
Kulicke & Soffa
KLIC
$5.55B
– –
-36
Closed -$1K
KMI icon
7631
Kinder Morgan
KMI
$72.9B
– –
-42,886
Closed -$702K
KOS icon
7632
Kosmos Energy
KOS
$1.63B
– –
-9,169
Closed -$66.9K
KPTI icon
7633
Karyopharm Therapeutics
KPTI
$161M
– –
-1,454
Closed -$360K
KRC icon
7634
CALL
Kilroy Realty
KRC
$4.46B
– –
-121
Closed -$8K
KRG icon
7635
CALL
Kite Realty
KRG
$5.87B
– –
-35
Closed -$2K
KTCC icon
7636
CALL
Key Tronic
KTCC
$39.5M
– –
-46
Closed -$1K
KW
7637
DELISTED
Kennedy-Wilson Holdings
KW
– –
-38,713
Closed -$759K
KW
7638
PUT
DELISTED
Kennedy-Wilson Holdings
KW
– –
-696
Closed -$47K
KYN icon
7639
Kayne Anderson Energy Infrastructure Fund
KYN
$2.53B
$0 ﹤0.01%
+8
New +$146
L icon
7640
PUT
Loews
L
$23.8B
– –
-82
Closed -$14K
LAB icon
7641
Standard BioTools
LAB
$343M
– –
-9,382
Closed -$53.5K
LAB icon
7642
PUT
Standard BioTools
LAB
$343M
– –
-460
Closed -$29K
LADR
7643
Ladder Capital
LADR
$1.22B
$0 ﹤0.01%
53
-42,733
-100% -$643K
LAZ icon
7644
Lazard
LAZ
$4.24B
– –
-13,519
Closed -$716K
LBTYK icon
7645
Liberty Global Class C
LBTYK
$3.37B
– –
-4,535
Closed -$132K
LECO icon
7646
Lincoln Electric
LECO
$13.7B
– –
-1,359
Closed -$121K
LEG icon
7647
Leggett & Platt
LEG
$1.45B
– –
-2,622
Closed -$113K
LFCR icon
7648
Lifecore Biomedical
LFCR
$166M
– –
-23,176
Closed -$302K
LFT
7649
Lument Finance Trust
LFT
$42.2M
$0 ﹤0.01%
+100
New +$340
LGMK
7650
CALL
DELISTED
LogicMark
LGMK
– –
0
– -$3K
304 305
306
307 308

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Simplex Trading's Q2 2018 Portfolio in Review

As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.

Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.

By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.

  • Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
  • Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
  • Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
  • Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
  • Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
  • Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
  • Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.

Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.