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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
CACI icon
7376
CACI
CACI
$10.6B
– –
-7,706
Closed -$1.24M
CAMT icon
7377
PUT
Camtek
CAMT
$7.24B
– –
-596
Closed -$43K
CARM
7378
DELISTED
Carisma Therapeutics
CARM
– –
-1,721
Closed -$75.8K
CARM
7379
PUT
DELISTED
Carisma Therapeutics
CARM
– –
-19
Closed -$63K
CATY icon
7380
Cathay General Bancorp
CATY
$4.19B
– –
-339
Closed -$13K
CATY icon
7381
PUT
Cathay General Bancorp
CATY
$4.19B
– –
-10
Closed -$1K
CBU icon
7382
Community Bank
CBU
$3.51B
– –
-800
Closed -$42K
CCEP icon
7383
Coca-Cola Europacific Partners
CCEP
$45.8B
– –
-3,501
Closed -$138K
CCS icon
7384
CALL
Century Communities
CCS
$1.99B
– –
-3
Closed -$2K
CDTX
7385
DELISTED
Cidara Therapeutics
CDTX
– –
-161
Closed -$12K
CDTX
7386
PUT
DELISTED
Cidara Therapeutics
CDTX
– –
-3
Closed -$11K
CF icon
7387
CF Industries
CF
$19.5B
– –
-18,995
Closed -$774K
CG icon
7388
Carlyle Group
CG
$16B
– –
-9,034
Closed -$194K
CHAU icon
7389
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$92.5M
– –
-20
Closed –
CHEF icon
7390
Chefs' Warehouse
CHEF
$3.85B
– –
-210
Closed -$5.5K
CHT icon
7391
Chunghwa Telecom
CHT
$32.9B
– –
-46
Closed -$1.71K
CIM
7392
Chimera Investment
CIM
$1.03B
– –
-750
Closed -$40.5K
CINF icon
7393
Cincinnati Financial
CINF
$27.7B
– –
-1
Closed -$71
CIO
7394
DELISTED
City Office REIT
CIO
– –
-1,165
Closed -$13.9K
CIO
7395
PUT
DELISTED
City Office REIT
CIO
– –
-13
Closed -$1K
CL icon
7396
Colgate-Palmolive
CL
$72.1B
– –
-94,238
Closed -$6.16M
CLAR icon
7397
Clarus
CLAR
$125M
– –
-357
Closed -$2K
CLB icon
7398
Core Laboratories
CLB
$544M
– –
-1,053
Closed -$128K
CLDT
7399
Chatham Lodging
CLDT
$620M
– –
-21,497
Closed -$428K
CLDT
7400
PUT
Chatham Lodging
CLDT
$620M
– –
-364
Closed -$45K
294 295
296
297 298

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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.