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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
+26.79%
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
$77.2B
AUM Growth
+$3.66B
Cap. Flow
-$1.09B
Cap. Flow %
-1.41%
Top 10 Hldgs %
42.09%
Holding
9,568
New
1,711
Increased
3,402
Reduced
3,106
Closed
1,157

Top Buys

Rank Stock Value
1
BABA icon
Alibaba
BABA
+$39.9M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$39M
3
MA icon
Mastercard
MA
+$31.3M
4
AAPL icon
Apple
AAPL
+$25.3M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$25.1M

Top Sells

Rank Stock Value
1
JPM icon
JPMorgan Chase
JPM
+$52.8M
2
TSM icon
TSMC
TSM
+$43M
3
AMZN icon
Amazon
AMZN
+$24.7M
4
SLV icon
iShares Silver Trust
SLV
+$24.2M
5
NFLX icon
Netflix
NFLX
+$21.1M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.65%
2 Technology 0.37%
3 Healthcare 0.33%
4 Industrials 0.21%
5 Communication Services 0.19%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RDI icon
8926
Reading International Class A
RDI
$32.5M
– –
-7,872
Closed -$27.5K
RDY icon
8927
Dr. Reddy's Laboratories
RDY
$9.83B
– –
-865
Closed -$11.6K
RDY icon
8928
PUT
Dr. Reddy's Laboratories
RDY
$9.83B
– –
-115
Closed -$159K
REFR icon
8929
CALL
Research Frontiers
REFR
$16.8M
– –
-212
Closed -$57K
REK icon
8930
ProShares Short Real Estate
REK
$11.8M
– –
-210
Closed -$5K
RES icon
8931
PUT
RPC Inc
RES
$1.3B
– –
-7
Closed -$1K
REVG
8932
PUT
DELISTED
REV Group
REVG
– –
-33
Closed -$26K
REXR icon
8933
Rexford Industrial Realty
REXR
$8.12B
– –
-143
Closed -$6.96K
REYN icon
8934
Reynolds Consumer Products
REYN
$5.31B
– –
-79
Closed -$2.39K
REZI icon
8935
Resideo Technologies
REZI
$5.16B
– –
-1,153
Closed -$18.4K
RFIL icon
8936
RF Industries
RFIL
$141M
$0 ﹤0.01%
104
-712
-87% -$3.39K
RGA icon
8937
Reinsurance Group of America
RGA
$15.3B
– –
-1,031
Closed -$115K
RGLD icon
8938
Royal Gold
RGLD
$16.9B
– –
-1,485
Closed -$172K
RGLS
8939
DELISTED
Regulus Therapeutics
RGLS
– –
-2,937
Closed -$21.6K
RLGT icon
8940
Radiant Logistics
RLGT
$414M
– –
-5,907
Closed -$33K
RLGT icon
8941
PUT
Radiant Logistics
RLGT
$414M
– –
-154
Closed -$79K
RLI icon
8942
CALL
RLI Corp
RLI
$5.62B
– –
-2
Closed -$8K
RLI icon
8943
PUT
RLI Corp
RLI
$5.62B
– –
-4
Closed -$16K
RLJ icon
8944
RLJ Lodging Trust
RLJ
$1.83B
– –
-1,668
Closed -$18.7K
RMAX icon
8945
CALL
RE/MAX Holdings
RMAX
$197M
– –
-14
Closed -$45K
RMTI icon
8946
PUT
Rockwell Medical
RMTI
$25.8M
– –
0
– -$4K
RNAC icon
8947
Cartesian Therapeutics
RNAC
$233M
$0 ﹤0.01%
356
+196
+123% +$17K
RNG icon
8948
RingCentral
RNG
$3.24B
$0 ﹤0.01%
+15,663
New +$4.87M
RNR icon
8949
RenaissanceRe
RNR
$13.5B
– –
-420
Closed -$71.3K
RNST icon
8950
Renasant Corp
RNST
$3.97B
– –
-926
Closed -$28.3K
356 357
358
359 360

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Simplex Trading's Q4 2020 Portfolio in Review

As of Q4 2020, Simplex Trading held 9,568 positions worth $77.2B, up 5% from $73.5B the previous quarter. Its ten largest holdings account for 42% of the portfolio.

Simplex Trading's Q4 2020 filing shows 1,711 new, 3,402 increased, 3,106 reduced and 1,157 closed positions. Its largest new stake was Alibaba: 143,630 shares worth $33.4M. The largest sale was JPMorgan Chase, an estimated $52.8M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.65% of assets, up from 0.53% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q4 2020 buy was Alibaba: 143,630 shares worth $33.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q4 2020, an estimated $39M increase.
  • Simplex Trading's biggest Q4 2020 reduction was JPMorgan Chase, cutting an estimated $52.8M.
  • Simplex Trading fully exited Target in Q4 2020, selling an estimated $14.3M.
  • Simplex Trading's ten largest holdings make up 42% of its $77.2B portfolio in Q4 2020.
  • Simplex Trading opened 1,711 new positions and closed 1,157 in Q4 2020.
  • Simplex Trading's portfolio value rose 5% quarter-over-quarter to $77.2B.

Based on Simplex Trading's 13F filing for Q4 2020, filed 2 Feb 2021.