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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
IRT icon
8676
Independence Realty Trust
IRT
$3.92B
– –
-7,432
Closed -$95K
IRTC icon
8677
iRhythm Holdings
IRTC
$3.59B
– –
-1,096
Closed -$250K
IRWD icon
8678
Ironwood Pharmaceuticals
IRWD
$611M
– –
-21,640
Closed -$237K
IT icon
8679
Gartner
IT
$9.41B
– –
-488
Closed -$70.3K
ITA icon
8680
iShares US Aerospace & Defense ETF
ITA
$14.2B
– –
-2,972
Closed -$235K
ITGR icon
8681
CALL
Integer Holdings
ITGR
$3.35B
– –
-3
Closed -$17K
ITGR icon
8682
PUT
Integer Holdings
ITGR
$3.35B
– –
-1
Closed -$5K
ITOT icon
8683
iShares Core S&P Total US Stock Market ETF
ITOT
$93.2B
– –
-1,850
Closed -$139K
ITRN icon
8684
CALL
Ituran Location and Control
ITRN
$1.08B
– –
-4
Closed -$5K
IVE icon
8685
iShares S&P 500 Value ETF
IVE
$48.9B
– –
-2,538
Closed -$285K
IVV icon
8686
iShares Core S&P 500 ETF
IVV
$876B
– –
-13,144
Closed -$4.42M
IVW icon
8687
iShares S&P 500 Growth ETF
IVW
$72.5B
– –
-41,200
Closed -$2.38M
IWC icon
8688
iShares Micro-Cap ETF
IWC
$1.43B
– –
-2,041
Closed -$184K
IWP icon
8689
iShares Russell Mid-Cap Growth ETF
IWP
$20B
– –
-968
Closed -$83K
IYG icon
8690
iShares US Financial Services ETF
IYG
$2.13B
– –
-300
Closed -$12K
IYT icon
8691
iShares US Transportation ETF
IYT
$2.33B
– –
-7,108
Closed -$353K
IYW icon
8692
iShares US Technology ETF
IYW
$23.7B
– –
-8,040
Closed -$605K
JACK icon
8693
Jack in the Box
JACK
$278M
– –
-3,374
Closed -$295K
JCI icon
8694
Johnson Controls International
JCI
$87.5B
– –
-29,541
Closed -$1.31M
JHG
8695
DELISTED
Janus Henderson
JHG
– –
-148
Closed -$4.22K
JHG
8696
PUT
DELISTED
Janus Henderson
JHG
– –
-1
Closed -$2K
JILL icon
8697
J. Jill
JILL
$252M
– –
-303
Closed -$1.18K
JJSF icon
8698
J&J Snack Foods
JJSF
$1.43B
– –
-93
Closed -$12K
JJSF icon
8699
PUT
J&J Snack Foods
JJSF
$1.43B
– –
-2
Closed -$26K
JKHY icon
8700
CALL
Jack Henry & Associates
JKHY
$10.7B
– –
-5
Closed -$81K
346 347
348
349 350

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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.