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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
+6.87%
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
$2.45B
AUM Growth
+$147M
Cap. Flow
+$26.3M
Cap. Flow %
1.07%
Top 10 Hldgs %
23.61%
Holding
7,357
New
1,313
Increased
2,078
Reduced
2,339
Closed
1,500

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$45.9M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$30.1M
3
TWX
Time Warner Inc
TWX
+$25.8M
4
BKNG icon
Booking.com
BKNG
+$22.5M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$17.7M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$43.6M
2
AMGN icon
Amgen
AMGN
+$33.2M
3
BIDU icon
Baidu
BIDU
+$19.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$17.3M
5
MU icon
Micron Technology
MU
+$17.1M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 14.31%
2 Technology 13.17%
3 Communication Services 11.81%
4 Healthcare 4.06%
5 Financials 3.84%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IDT icon
6201
PUT
IDT Corp
IDT
$1.6B
– –
-77
Closed -$3K
IDXX icon
6202
Idexx Laboratories
IDXX
$42.7B
– –
-1,868
Closed -$295K
IFF icon
6203
PUT
International Flavors & Fragrances
IFF
$19.4B
– –
-42
Closed -$4K
BRSL
6204
Brightstar Lottery PLC
BRSL
$1.93B
– –
-4,915
Closed -$100K
IHF icon
6205
iShares US Healthcare Providers ETF
IHF
$1.18B
– –
-820
Closed -$24K
IHG icon
6206
InterContinental Hotels
IHG
$23.1B
– –
-172
Closed -$9.59K
IHG icon
6207
PUT
InterContinental Hotels
IHG
$23.1B
– –
-10
Closed -$2K
IJH icon
6208
iShares Core S&P Mid-Cap ETF
IJH
$123B
– –
-15,630
Closed -$543K
ILF icon
6209
iShares Latin America 40 ETF
ILF
$3.78B
– –
-2,620
Closed -$79K
INDA icon
6210
iShares MSCI India ETF
INDA
$6.73B
– –
-4,387
Closed -$140K
INDB icon
6211
Independent Bank
INDB
$4.08B
– –
-308
Closed -$21.4K
INDB icon
6212
PUT
Independent Bank
INDB
$4.08B
– –
-14
Closed -$2K
INGN icon
6213
Inogen
INGN
$169M
– –
-4,459
Closed -$430K
INN
6214
Summit Hotel Properties
INN
$764M
– –
-69
Closed -$1K
INOD icon
6215
Innodata
INOD
$1.86B
– –
-3,916
Closed -$6K
INOD icon
6216
PUT
Innodata
INOD
$1.86B
– –
-40
Closed -$12K
IONS icon
6217
Ionis Pharmaceuticals
IONS
$9.47B
– –
-2,631
Closed -$138K
IPAY icon
6218
Amplify Mobile Payments ETF
IPAY
$154M
– –
-650
Closed -$19K
IT icon
6219
Gartner
IT
$9.3B
– –
-71
Closed -$8K
ITGR icon
6220
CALL
Integer Holdings
ITGR
$3.34B
– –
-17
Closed -$10K
ITT icon
6221
PUT
ITT
ITT
$17.6B
– –
-65
Closed -$2K
ITRI icon
6222
PUT
Itron
ITRI
$3.78B
– –
-27
Closed -$2K
ITUB icon
6223
Itaú Unibanco
ITUB
$91.6B
– –
-7,739
Closed -$47.3K
IVV icon
6224
iShares Core S&P 500 ETF
IVV
$879B
– –
-211
Closed -$51K
IVW icon
6225
iShares S&P 500 Growth ETF
IVW
$73B
– –
-37,084
Closed -$1.27M
247 248
249
250 251

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Simplex Trading's Q3 2017 Portfolio in Review

As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
  • Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
  • Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
  • Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
  • Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
  • Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
  • Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.

Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.