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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
ORMP icon
7651
Oramed Pharmaceuticals
ORMP
$170M
– –
-1,035
Closed -$3K
ORMP icon
7652
PUT
Oramed Pharmaceuticals
ORMP
$170M
– –
-10
Closed -$3K
ORN icon
7653
Orion Group Holdings
ORN
$523M
– –
-42
Closed -$177
OSIS icon
7654
OSI Systems
OSIS
$3.53B
– –
-7,384
Closed -$618K
OTEX icon
7655
Open Text
OTEX
$5.22B
– –
-2,932
Closed -$107K
OTEX icon
7656
PUT
Open Text
OTEX
$5.22B
– –
-14
Closed -$45K
OTTR icon
7657
CALL
Otter Tail
OTTR
$3.87B
– –
-14
Closed -$69K
OUT icon
7658
PUT
Outfront Media
OUT
$5.61B
– –
-40
Closed -$70K
OVV icon
7659
CALL
Ovintiv
OVV
$17.3B
– –
-227
Closed -$656K
OVV icon
7660
Ovintiv
OVV
$17.3B
– –
-14,509
Closed -$497K
OVV icon
7661
PUT
Ovintiv
OVV
$17.3B
– –
-150
Closed -$432K
OXM icon
7662
Oxford Industries
OXM
$570M
– –
-701
Closed -$53.9K
PACB icon
7663
Pacific Biosciences
PACB
$435M
– –
-8,045
Closed -$58.2K
PAG icon
7664
Penske Automotive Group
PAG
$14.2B
– –
-5,490
Closed -$243K
PAG icon
7665
PUT
Penske Automotive Group
PAG
$14.2B
– –
-107
Closed -$431K
PAGP icon
7666
Plains GP Holdings
PAGP
$5.25B
– –
-16,775
Closed -$396K
PAM icon
7667
Pampa Energía
PAM
$4.78B
– –
-250
Closed -$7K
PAM icon
7668
PUT
Pampa Energía
PAM
$4.78B
– –
-4
Closed -$12K
PANW icon
7669
Palo Alto Networks
PANW
$265B
– –
-38,760
Closed -$1.44M
PATK icon
7670
Patrick Industries
PATK
$2.83B
– –
-150
Closed -$2K
PATK icon
7671
PUT
Patrick Industries
PATK
$2.83B
– –
-3
Closed -$5K
PAYC icon
7672
Paycom
PAYC
$6.47B
– –
-1,669
Closed -$271K
PBF icon
7673
PBF Energy
PBF
$7.33B
– –
-3,884
Closed -$131K
PBH icon
7674
Prestige Consumer Healthcare
PBH
$2.32B
– –
-9,534
Closed -$273K
PBPB
7675
CALL
DELISTED
Potbelly
PBPB
– –
-11
Closed -$8K
305 306
307
308 309

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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.