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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
+6.2%
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
$2.32B
AUM Growth
-$126M
Cap. Flow
-$315M
Cap. Flow %
-13.55%
Top 10 Hldgs %
17.34%
Holding
7,407
New
1,548
Increased
2,053
Reduced
2,239
Closed
1,460

Top Buys

Rank Stock Value
1
CELG
Celgene Corp
CELG
+$31.6M
2
C icon
Citigroup
C
+$19.5M
3
AGN
Allergan plc
AGN
+$18.4M
4
BIDU icon
Baidu
BIDU
+$18M
5
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$14.2M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$81.3M
2
NVDA icon
NVIDIA
NVDA
+$60.2M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$48.2M
4
AAPL icon
Apple
AAPL
+$48.2M
5
META icon
Meta Platforms (Facebook)
META
+$31.2M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 11.27%
2 Technology 10.64%
3 Healthcare 7.06%
4 Communication Services 6.92%
5 Industrials 5.66%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ICAD
6276
PUT
DELISTED
iCAD Inc
ICAD
– –
-20
Closed -$11K
ICE icon
6277
Intercontinental Exchange
ICE
$82.4B
– –
-7,765
Closed -$533K
ICUI icon
6278
ICU Medical
ICUI
$3.93B
– –
-177
Closed -$35.8K
ICUI icon
6279
PUT
ICU Medical
ICUI
$3.93B
– –
-5
Closed -$1K
IEP icon
6280
CALL
Icahn Enterprises
IEP
$5.17B
– –
-1
Closed -$1K
IEZ icon
6281
iShares US Oil Equipment & Services ETF
IEZ
$367M
– –
-5,743
Closed -$203K
IHI icon
6282
iShares US Medical Devices ETF
IHI
$3.02B
– –
-3,924
Closed -$109K
IJK icon
6283
iShares S&P Mid-Cap 400 Growth ETF
IJK
$10.8B
– –
-1,164
Closed -$58K
IMO icon
6284
CALL
Imperial Oil
IMO
$62.1B
– –
-67
Closed -$14K
IMOS
6285
CALL
ChipMOS TECHNOLOGIES
IMOS
$1.92B
– –
-20
Closed -$1K
IMOS
6286
PUT
ChipMOS TECHNOLOGIES
IMOS
$1.92B
– –
-170
Closed -$7K
IMUX icon
6287
Immunic
IMUX
$182M
– –
-1
Closed -$2.21K
INCY icon
6288
Incyte
INCY
$23.5B
– –
-13,647
Closed -$1.43M
INDB icon
6289
CALL
Independent Bank
INDB
$4.05B
– –
-10
Closed -$1K
ING icon
6290
PUT
ING
ING
$93.8B
– –
-322
Closed -$4K
INGN icon
6291
CALL
Inogen
INGN
$167M
– –
-20
Closed -$1K
INGN icon
6292
PUT
Inogen
INGN
$167M
– –
-76
Closed -$3K
INGR icon
6293
PUT
Ingredion
INGR
$6.38B
– –
-4
Closed -$1K
INSG icon
6294
CALL
Inseego
INSG
$108M
– –
-18
Closed -$2K
INTC icon
6295
Intel
INTC
$464B
– –
-76,571
Closed -$3.34M
IOVA icon
6296
Iovance Biotherapeutics
IOVA
$2.23B
– –
-1,784
Closed -$14.3K
IPG
6297
DELISTED
Interpublic Group of Companies
IPG
– –
-6,707
Closed -$134K
IPGP icon
6298
IPG Photonics
IPGP
$3.89B
– –
-7,187
Closed -$1.53M
IPI icon
6299
Intrepid Potash
IPI
$460M
– –
-4,296
Closed -$167K
IRBT
6300
DELISTED
iRobot
IRBT
– –
-18,172
Closed -$1.31M
250 251
252
253 254

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Simplex Trading's Q4 2017 Portfolio in Review

As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.

Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.

By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.

Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.

  • Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
  • Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
  • Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
  • Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
  • Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
  • Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
  • Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.

Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.