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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
GRMN
6226
Garmin
GRMN
$46.9B
– –
-7,067
Closed -$415K
GRPN icon
6227
Groupon
GRPN
$980M
– –
-270
Closed -$28.4K
GS icon
6228
Goldman Sachs
GS
$313B
– –
-20,615
Closed -$5.06M
GSIT icon
6229
CALL
GSI Technology
GSIT
$216M
– –
-6
Closed -$1K
GURE
6230
Gulf Resources
GURE
$5.23M
– –
-76
Closed -$6.11K
GURE
6231
PUT
Gulf Resources
GURE
$5.23M
– –
-1
Closed -$6K
GVA icon
6232
CALL
Granite Construction
GVA
$5.45B
– –
-41
Closed -$12K
GVA icon
6233
PUT
Granite Construction
GVA
$5.45B
– –
-50
Closed -$2K
GWRE icon
6234
Guidewire Software
GWRE
$11.5B
– –
-743
Closed -$57.4K
COLO
6235
Global X MSCI Colombia ETF
COLO
$196M
– –
-25
Closed -$1K
H icon
6236
CALL
Hyatt Hotels
H
$17.6B
– –
-7
Closed -$1K
HBIO icon
6237
CALL
Harvard Bioscience
HBIO
$27.1M
– –
-1
Closed -$1K
HBIO icon
6238
Harvard Bioscience
HBIO
$27.1M
– –
-14
Closed –
HBM icon
6239
Hudbay
HBM
$9.92B
– –
-5,441
Closed -$42.5K
HCA icon
6240
HCA Healthcare
HCA
$84.8B
– –
-8,078
Closed -$649K
HCKT icon
6241
Hackett Group
HCKT
$245M
– –
-314
Closed -$4K
HDSN
6242
CALL
Hudson Technologies
HDSN
$267M
– –
-101
Closed -$3K
HEI icon
6243
HEICO Corp
HEI
$48.9B
– –
-4,369
Closed -$200K
HGV icon
6244
CALL
Hilton Grand Vacations
HGV
$3.84B
– –
-10
Closed -$1K
HGV icon
6245
Hilton Grand Vacations
HGV
$3.84B
– –
-1,378
Closed -$56.1K
HGV icon
6246
PUT
Hilton Grand Vacations
HGV
$3.84B
– –
-103
Closed -$2K
HIMX
6247
Himax Technologies
HIMX
$2.2B
– –
-55,040
Closed -$597K
HLI icon
6248
Houlihan Lokey
HLI
$9.68B
– –
-100
Closed -$4.28K
HMC icon
6249
CALL
Honda
HMC
$36.5B
– –
-97
Closed -$3K
HMC icon
6250
PUT
Honda
HMC
$36.5B
– –
-54
Closed -$3K
248 249
250
251 252

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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.