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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
NVRI icon
7626
Enviri
NVRI
$633M
– –
-330
Closed -$7.11K
NWBI icon
7627
Northwest Bancshares
NWBI
$2.24B
– –
-310
Closed -$5.5K
NWPX icon
7628
CALL
NWPX Infrastructure Inc
NWPX
$1.28B
– –
-1
Closed -$2K
NWS icon
7629
CALL
News Corp Class B
NWS
$16.1B
– –
-680
Closed -$771K
NXST icon
7630
Nexstar Media Group
NXST
$5.53B
– –
-16,596
Closed -$1.53M
OBE
7631
CALL
Obsidian Energy
OBE
$717M
– –
-16
Closed -$4K
OBE
7632
Obsidian Energy
OBE
$717M
$0 ﹤0.01%
29
-971
-97% -$2.58K
OBE
7633
PUT
Obsidian Energy
OBE
$717M
– –
-29
Closed -$8K
OCSL icon
7634
Oaktree Specialty Lending
OCSL
$1.02B
– –
-309
Closed -$4.61K
OCSL icon
7635
PUT
Oaktree Specialty Lending
OCSL
$1.02B
– –
-4
Closed -$4K
OCUL icon
7636
Ocular Therapeutix
OCUL
$1.89B
– –
-7,493
Closed -$30.1K
ODFL icon
7637
Old Dominion Freight Line
ODFL
$48B
– –
-86,781
Closed -$4.06M
OEC icon
7638
Orion
OEC
$387M
– –
-2,123
Closed -$53.3K
OIH icon
7639
VanEck Oil Services ETF
OIH
$2.01B
– –
-8,102
Closed -$2.27M
OLLI icon
7640
Ollie's Bargain Outlet
OLLI
$3.94B
– –
-10,661
Closed -$859K
OMCL icon
7641
Omnicell
OMCL
$1.81B
– –
-4,834
Closed -$362K
OMCL icon
7642
PUT
Omnicell
OMCL
$1.81B
– –
-108
Closed -$661K
OMER icon
7643
Omeros
OMER
$744M
– –
-16,253
Closed -$234K
OMF icon
7644
OneMain Financial
OMF
$6.79B
– –
-100
Closed -$3.1K
ACH
7645
Accendra Health
ACH
$240M
– –
-9,628
Closed -$60.9K
OOMA icon
7646
Ooma
OOMA
$532M
– –
-2,098
Closed -$31.6K
OOMA icon
7647
PUT
Ooma
OOMA
$532M
– –
-6
Closed -$8K
OPI
7648
DELISTED
Office Properties Income Trust
OPI
$0 ﹤0.01%
+6,243
New +$189K
ORA icon
7649
Ormat Technologies
ORA
$6.38B
– –
-612
Closed -$33.9K
ORMP icon
7650
CALL
Oramed Pharmaceuticals
ORMP
$170M
– –
-10
Closed -$3K
304 305
306
307 308

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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.