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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
HR
7026
DELISTED
Healthcare Realty Trust Incorporated
HR
$1K ﹤0.01%
59
-706
-92% -$22.2K
AAPL icon
7027
Apple
AAPL
$4.89T
– –
-496,528
Closed -$21.1M
AAT
7028
CALL
American Assets Trust
AAT
$1.49B
– –
-8
Closed -$32K
AAXJ icon
7029
iShares MSCI All Country Asia ex Japan ETF
AAXJ
$3.65B
– –
-520
Closed -$33K
ABBV icon
7030
AbbVie
ABBV
$458B
– –
-27,149
Closed -$2.22M
ABM icon
7031
ABM Industries
ABM
$2.8B
– –
-3,775
Closed -$131K
ABUS icon
7032
PUT
Arbutus Biopharma
ABUS
$865M
– –
-10
Closed -$3K
ACCO icon
7033
PUT
Acco Brands
ACCO
$369M
– –
-93
Closed -$63K
ACGL icon
7034
CALL
Arch Capital
ACGL
$36.1B
– –
-1
Closed -$2K
ACIW icon
7035
ACI Worldwide
ACIW
$5.72B
– –
-133
Closed -$4.05K
ACLS icon
7036
PUT
Axcelis
ACLS
$4.12B
– –
-1
Closed -$1K
ACM icon
7037
PUT
Aecom
ACM
$9.07B
– –
-29
Closed -$76K
ACNT icon
7038
PUT
Ascent Industries
ACNT
$137M
– –
-78
Closed -$129K
ADBE icon
7039
Adobe
ADBE
$89.5B
– –
-51
Closed -$12.9K
ADEA icon
7040
Adeia
ADEA
$2.86B
– –
-10,913
Closed -$64.1K
ADMA icon
7041
ADMA Biologics
ADMA
$1.92B
– –
-284
Closed -$1K
ADMA icon
7042
PUT
ADMA Biologics
ADMA
$1.92B
– –
-9
Closed -$2K
ADTN icon
7043
Adtran
ADTN
$798M
$0 ﹤0.01%
10
-3,046
-100% -$42.1K
AEE icon
7044
Ameren
AEE
$31.5B
– –
-1,485
Closed -$103K
AEM icon
7045
Agnico Eagle Mines
AEM
$72.6B
– –
-8,284
Closed -$350K
AEO icon
7046
American Eagle Outfitters
AEO
$2.85B
– –
-21,518
Closed -$442K
AFG icon
7047
American Financial Group
AFG
$11.9B
– –
-104
Closed -$9.96K
AFL icon
7048
Aflac
AFL
$63.9B
– –
-48,615
Closed -$2.34M
AGCO icon
7049
AGCO
AGCO
$8.78B
– –
-6,414
Closed -$415K
AGM icon
7050
Federal Agricultural Mortgage
AGM
$2.27B
– –
-844
Closed -$51K
280 281
282
283 284

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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.