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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
AUO
6776
PUT
DELISTED
AU Optronics Corp
AUO
$5K ﹤0.01%
+14
New +$60
TRCO
6777
PUT
DELISTED
TRIBUNE MEDIA COMPANY CLASS A
TRCO
$5K ﹤0.01%
61
+50
+455% +$1.9K
ATTU
6778
PUT
DELISTED
Attunity Ltd
ATTU
$5K ﹤0.01%
+5
New +$50
PGLC
6779
CALL
DELISTED
Pershing Gold Corporation. Common Stock
PGLC
$5K ﹤0.01%
+31
New +$60
DCM
6780
DELISTED
NTT DOCOMO, Inc.
DCM
$5K ﹤0.01%
200
-142
-42% -$3.7K
AIR icon
6781
AAR Corp
AIR
$5.15B
$4K ﹤0.01%
97
-1,740
-95% -$79.3K
ANGI icon
6782
CALL
Angi Inc
ANGI
$224M
– –
0
– –
ASRT
6783
PUT
DELISTED
Assertio
ASRT
– –
0
– –
AVTX icon
6784
CALL
Avalo Therapeutics
AVTX
$976M
– –
0
– –
BKU icon
6785
PUT
Bankunited
BKU
$3.38B
$4K ﹤0.01%
+1
New +$41
BW icon
6786
CALL
Babcock & Wilcox
BW
$1.43B
$4K ﹤0.01%
2
-26
-93% -$691
CAF
6787
CALL
Morgan Stanley China A Share Fund
CAF
$334M
$4K ﹤0.01%
+2
New +$51
CDXS icon
6788
CALL
Codexis
CDXS
$135M
$4K ﹤0.01%
+3
New +$39
CSGS
6789
PUT
DELISTED
CSG Systems International
CSGS
$4K ﹤0.01%
+1
New +$42
EEM icon
6790
iShares MSCI Emerging Markets ETF
EEM
$28B
$4K ﹤0.01%
+100
New +$4.63K
EFU icon
6791
ProShares Trust UltraShort MSCI EAFE
EFU
$1.23M
$4K ﹤0.01%
100
– –
EGAN icon
6792
PUT
eGain
EGAN
$176M
$4K ﹤0.01%
+3
New +$32
FF icon
6793
PUT
Future Fuel
FF
$204M
$4K ﹤0.01%
+3
New +$39
FFBC icon
6794
First Financial Bancorp
FFBC
$3.55B
$4K ﹤0.01%
139
+62
+81% +$1.94K
FHB icon
6795
First Hawaiian
FHB
$3.42B
$4K ﹤0.01%
+160
New +$4.62K
FNB icon
6796
FNB Corp
FNB
$6.78B
$4K ﹤0.01%
+342
New +$4.61K
FPI
6797
Farmland Partners
FPI
$419M
$4K ﹤0.01%
549
-543
-50% -$4.5K
FRO icon
6798
Frontline
FRO
$8.75B
$4K ﹤0.01%
707
-1,073
-60% -$5.41K
FSP
6799
PUT
Franklin Street Properties
FSP
$44.8M
$4K ﹤0.01%
+5
New +$40
GAIN icon
6800
Gladstone Investment Corp
GAIN
$635M
$4K ﹤0.01%
+402
New +$4.52K
270 271
272
273 274

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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.