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
+18.73%
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
$55.7B
AUM Growth
-$21.5B
Cap. Flow
-$23.5B
Cap. Flow %
-42.23%
Top 10 Hldgs %
43.23%
Holding
10,706
New
2,258
Increased
3,361
Reduced
3,151
Closed
1,706

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$67.5M
2
PLTR icon
Palantir
PLTR
+$64.7M
3
PARA
Paramount Global Class B
PARA
+$31.5M
4
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$30.7M
5
CCL icon
Carnival Corporation Ltd
CCL
+$25.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
TSLA icon
Tesla
TSLA
+$53.7M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$38.1M
4
QQQ icon
Invesco QQQ Trust
QQQ
+$37.6M
5
AZO icon
AutoZone
AZO
+$28.5M

Sector Composition

Rank Sector Weight
1 Technology 0.65%
2 Consumer Discretionary 0.49%
3 Healthcare 0.32%
4 Financials 0.3%
5 Industrials 0.29%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RGEN icon
9826
Repligen
RGEN
$7.76B
– –
-2,707
Closed -$555K
RGEN icon
9827
PUT
Repligen
RGEN
$7.76B
– –
-138
Closed -$2.64M
RHP icon
9828
Ryman Hospitality Properties
RHP
$8.13B
– –
-11,613
Closed -$858K
RIG icon
9829
CALL
Transocean
RIG
$5.89B
– –
-5,522
Closed -$1.27M
RIG icon
9830
Transocean
RIG
$5.89B
$0 ﹤0.01%
167,219
+101,837
+156% +$354K
RIG icon
9831
PUT
Transocean
RIG
$5.89B
– –
-3,197
Closed -$738K
RIO icon
9832
Rio Tinto
RIO
$149B
– –
-56,152
Closed -$4.61M
RL icon
9833
Ralph Lauren
RL
$22.1B
– –
-14,819
Closed -$1.69M
RMAX icon
9834
RE/MAX Holdings
RMAX
$197M
– –
-171
Closed -$6K
RMAX icon
9835
PUT
RE/MAX Holdings
RMAX
$197M
– –
-1
Closed -$3K
RM icon
9836
CALL
Regional Management Corp
RM
$379M
– –
-5
Closed -$14K
RM icon
9837
Regional Management Corp
RM
$379M
– –
-2,042
Closed -$60K
RMTI icon
9838
Rockwell Medical
RMTI
$25.8M
– –
-127
Closed -$18.8K
RNST icon
9839
PUT
Renasant Corp
RNST
$3.97B
– –
-1
Closed -$3K
ROKU icon
9840
Roku
ROKU
$21B
– –
-22,947
Closed -$8.99M
ROL icon
9841
Rollins
ROL
$19B
– –
-2,321
Closed -$83.1K
ROOT icon
9842
Root
ROOT
$911M
– –
-1,919
Closed -$580K
RPAY icon
9843
CALL
Repay Holdings
RPAY
$298M
– –
-16
Closed -$43K
RRX icon
9844
Regal Rexnord
RRX
$14.2B
– –
-1,654
Closed -$227K
RS icon
9845
Reliance Steel & Aluminium
RS
$20.2B
– –
-8,346
Closed -$1.12M
RSG icon
9846
Republic Services
RSG
$66.9B
– –
-197
Closed -$18.5K
RSPH icon
9847
Invesco S&P 500 Equal Weight Health Care ETF
RSPH
$737M
– –
-4,600
Closed -$120K
RVMD icon
9848
Revolution Medicines
RVMD
$40.1B
– –
-701
Closed -$31.4K
RWM icon
9849
ProShares Short Russell2000
RWM
$122M
– –
-3,196
Closed -$81K
SAFT icon
9850
CALL
Safety Insurance
SAFT
$1.07B
– –
-64
Closed -$498K
392 393
394
395 396

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 2021 Portfolio in Review

As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.

  • Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
  • Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
  • Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
  • Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
  • Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.

Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.