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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
RGA icon
7726
PUT
Reinsurance Group of America
RGA
$15.3B
– –
-112
Closed -$1.57M
RGP icon
7727
Resources Connection
RGP
$129M
– –
-142
Closed -$2.37K
RGS icon
7728
PUT
Regis Corp
RGS
$68.8M
– –
0
– -$3K
RH icon
7729
RH
RH
$3.14B
– –
-13,481
Closed -$1.84M
RIGL icon
7730
Rigel Pharmaceuticals
RIGL
$681M
– –
-3,077
Closed -$70.3K
RIGL icon
7731
PUT
Rigel Pharmaceuticals
RIGL
$681M
– –
-30
Closed -$69K
RIOT icon
7732
Riot Platforms
RIOT
$9.02B
– –
-6,666
Closed -$17.4K
RLGT icon
7733
Radiant Logistics
RLGT
$414M
– –
-75
Closed -$413
RLI icon
7734
CALL
RLI Corp
RLI
$5.62B
– –
-2
Closed -$6K
RMAX icon
7735
PUT
RE/MAX Holdings
RMAX
$197M
– –
-11
Closed -$33K
RMBS icon
7736
Rambus
RMBS
$11.2B
– –
-1,646
Closed -$15.8K
RMTI icon
7737
Rockwell Medical
RMTI
$25.8M
– –
-56
Closed -$25.5K
RNR icon
7738
CALL
RenaissanceRe
RNR
$13.5B
– –
-4
Closed -$53K
RNR icon
7739
RenaissanceRe
RNR
$13.5B
– –
-2,387
Closed -$319K
ROP icon
7740
PUT
Roper Technologies
ROP
$35.8B
– –
-1
Closed -$26K
RS icon
7741
Reliance Steel & Aluminium
RS
$20.2B
– –
-1,941
Closed -$162K
RSG icon
7742
PUT
Republic Services
RSG
$66.9B
– –
-32
Closed -$230K
RUN icon
7743
Sunrun
RUN
$2.48B
– –
-8,637
Closed -$119K
RVTY icon
7744
Revvity
RVTY
$12.6B
– –
-120
Closed -$10.8K
RWT
7745
CALL
Redwood Trust
RWT
$614M
– –
-223
Closed -$336K
RWT
7746
Redwood Trust
RWT
$614M
$0 ﹤0.01%
+29
New +$458
RYZ
7747
CALL
Ryerson Holding Corp
RYZ
$1.54B
– –
-14
Closed -$8K
RYZ
7748
Ryerson Holding Corp
RYZ
$1.54B
$0 ﹤0.01%
100
-113
-53% -$876
SAIC icon
7749
Saic
SAIC
$4.93B
– –
-35
Closed -$2.46K
SAM icon
7750
Boston Beer
SAM
$1.82B
– –
-1,131
Closed -$309K
308 309
310
311 312

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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.