We are live on ! Find out more
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
MAA icon
7526
PUT
Mid-America Apartment Communities
MAA
$15.5B
– –
-72
Closed -$689K
MAC icon
7527
Macerich
MAC
$7.31B
– –
-134
Closed -$5.92K
MAIN icon
7528
Main Street Capital
MAIN
$4.94B
– –
-9,673
Closed -$360K
MANH icon
7529
Manhattan Associates
MANH
$9.11B
– –
-123
Closed -$6.29K
MANU icon
7530
Manchester United
MANU
$3.93B
– –
-134
Closed -$2.63K
MANU icon
7531
PUT
Manchester United
MANU
$3.93B
– –
-1
Closed -$1K
MARA icon
7532
Marathon Digital Holdings
MARA
$4.82B
– –
-375
Closed -$766
MARA icon
7533
PUT
Marathon Digital Holdings
MARA
$4.82B
– –
-11
Closed -$1K
MAS icon
7534
Masco
MAS
$16B
– –
-3,217
Closed -$115K
MASI
7535
DELISTED
Masimo
MASI
– –
-949
Closed -$119K
MATV icon
7536
Mativ Holdings
MATV
$449M
– –
-37
Closed -$1.26K
MBUU icon
7537
PUT
Malibu Boats
MBUU
$544M
– –
-18
Closed -$62K
MCD icon
7538
McDonald's
MCD
$189B
– –
-8,049
Closed -$1.46M
MCFT icon
7539
MasterCraft Boat Holdings
MCFT
$588M
– –
-48
Closed -$1.06K
MCO icon
7540
Moody's
MCO
$82.2B
– –
-9,710
Closed -$1.6M
MCRB icon
7541
CALL
Seres Therapeutics
MCRB
$49.4M
– –
0
– -$4K
MCRI icon
7542
Monarch Casino & Resort
MCRI
$2.15B
– –
-257
Closed -$9K
MCRI icon
7543
PUT
Monarch Casino & Resort
MCRI
$2.15B
– –
-3
Closed -$11K
MD icon
7544
CALL
Pediatrix Medical
MD
$2.15B
– –
-11
Closed -$36K
MDXG icon
7545
CALL
MiMedx Group
MDXG
$623M
– –
-314
Closed -$56K
MDXG icon
7546
PUT
MiMedx Group
MDXG
$623M
– –
-759
Closed -$135K
MDY icon
7547
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27.2B
– –
-17,165
Closed -$5.77M
MEI icon
7548
Methode Electronics
MEI
$559M
– –
-1,585
Closed -$43.3K
MESO
7549
Mesoblast
MESO
$1.99B
– –
-50
Closed –
RJET
7550
Republic Airways Holdings
RJET
$810M
– –
-14
Closed -$1K
300 301
302
303 304

Similar funds

Mitsubishi UFJ Asset Management
Mitsubishi UFJ Asset Management Tokyo, Japan $149B AUM 24.71% 1-Year Est. Return
Creative Planning
Creative Planning Overland Park, Kansas $147B AUM 18.73% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $154B AUM 29.96% 1-Year Est. Return
Canada Pension Plan Investment Board
Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $155B AUM 29.93% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $156B AUM 27.51% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return

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.