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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
+17.83%
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
$36B
AUM Growth
+$1.89B
Cap. Flow
-$586M
Cap. Flow %
-1.63%
Top 10 Hldgs %
34.84%
Holding
8,479
New
1,472
Increased
3,049
Reduced
2,419
Closed
1,324

Top Buys

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$86.9M
2
DIS icon
Walt Disney
DIS
+$25.5M
3
BIDU icon
Baidu
BIDU
+$12.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$12.3M
5
RHT
Red Hat Inc
RHT
+$11.4M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$60.3M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$33.9M
4
AAPL icon
Apple
AAPL
+$21.1M
5
XLF icon
State Street Financial Select Sector SPDR ETF
XLF
+$18.2M

Sector Composition

Rank Sector Weight
1 Communication Services 0.58%
2 Technology 0.42%
3 Healthcare 0.34%
4 Consumer Discretionary 0.29%
5 Industrials 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TU icon
7876
Telus
TU
$15.8B
$0 ﹤0.01%
+34
New +$601
TURN
7877
DELISTED
180 Degree Capital
TURN
$0 ﹤0.01%
3
– –
TUSK icon
7878
CALL
Mammoth Energy Services
TUSK
$133M
– –
-10
Closed -$17K
TVTX icon
7879
Travere Therapeutics
TVTX
$5.2B
– –
-17,548
Closed -$388K
TWI icon
7880
Titan International
TWI
$500M
– –
-508
Closed -$2.86K
TWI icon
7881
PUT
Titan International
TWI
$500M
– –
-10
Closed -$4K
TWLO icon
7882
Twilio
TWLO
$27.6B
– –
-244
Closed -$27.5K
TX icon
7883
PUT
Ternium
TX
$9.26B
– –
-30
Closed -$81K
TXT icon
7884
Textron
TXT
$16.1B
– –
-16,645
Closed -$859K
TZA icon
7885
Direxion Daily Small Cap Bear 3x ETF
TZA
$212M
– –
-540
Closed -$3.29M
UAN icon
7886
CALL
CVR Partners
UAN
$1.31B
– –
-1
Closed -$1K
UBX
7887
DELISTED
Unity Biotechnology
UBX
$0 ﹤0.01%
+11
New +$1.25K
UE icon
7888
CALL
Urban Edge Properties
UE
$2.89B
– –
-23
Closed -$38K
UFI icon
7889
UNIFI
UFI
$114M
$0 ﹤0.01%
+25
New +$545
UFPI icon
7890
UFP Industries
UFPI
$4.83B
– –
-4,265
Closed -$128K
UGI icon
7891
PUT
UGI
UGI
$7.9B
– –
-4
Closed -$21K
ULE icon
7892
ProShares Ultra Euro
ULE
$4.29M
– –
-200
Closed -$3K
ULTA icon
7893
Ulta Beauty
ULTA
$20.6B
– –
-12,326
Closed -$3.73M
UNIT
7894
Uniti Group
UNIT
$2.67B
– –
-14,526
Closed -$213K
UNP icon
7895
Union Pacific
UNP
$181B
– –
-11,455
Closed -$1.84M
UPLD icon
7896
PUT
Upland Software
UPLD
$12.4M
– –
-3
Closed -$78K
URBN icon
7897
Urban Outfitters
URBN
$5.98B
– –
-718
Closed -$22.1K
USB icon
7898
US Bancorp
USB
$98.5B
– –
-76,120
Closed -$3.48M
AD
7899
CALL
Array Digital Infrastructure
AD
$2.97B
– –
-9
Closed -$46K
AD
7900
Array Digital Infrastructure
AD
$2.97B
– –
-7,449
Closed -$390K
314 315
316
317 318

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Simplex Trading's Q1 2019 Portfolio in Review

As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.

Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.

By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
  • Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
  • Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
  • Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
  • Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
  • Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.

Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.