Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MYOK
3951
CALL
DELISTED
MyoKardia, Inc. Common Stock
MYOK
| $140K | ﹤0.01% |
27
+25
| +1,250% | +$1.33K |
|
|
AZUL
3952
CALL
DELISTED
Azul
AZUL
| $139K | ﹤0.01% |
39
+15
| +63% | +$561 |
|
3953
Comstock Resources
CRK
$3.7B
| $139K | ﹤0.01% |
17,858
+14,775
| +479% | +$98.6K |
|
3954
The Ensign Group
ENSG
$10.6B
| $139K | ﹤0.01% |
+3,144
| New | +$156K |
|
3955
iShares Russell 1000 Growth ETF
IWF
$117B
| $139K | ﹤0.01% |
+3,500
| New | +$140K |
|
3956
iShares MBS ETF
MBB
$39.1B
| $139K | ﹤0.01% |
+1,292
| New | +$139K |
|
3957
EPAM Systems
EPAM
$5.58B
| $138K | ﹤0.01% |
+759
| New | +$143K |
|
3958
GoPro
GPRO
$120M
| $138K | ﹤0.01% |
+26,660
| New | +$125K |
|
|
ONC
3959
BeOne Medicines Ltd
ONC
$33.9B
| $138K | ﹤0.01% |
+1,133
| New | +$150K |
|
|
EGOV
3960
PUT
DELISTED
NIC Inc
EGOV
| $138K | ﹤0.01% |
67
+64
| +2,133% | +$1.25K |
|
3961
PUT
United States Brent Oil Fund
BNO
$782M
| $137K | ﹤0.01% |
76
+40
| +111% | +$739 |
|
3962
Globus Medical
GMED
$11.1B
| $137K | ﹤0.01% |
+2,694
| New | +$128K |
|
3963
LGI Homes
LGIH
$1.35B
| $137K | ﹤0.01% |
+1,654
| New | +$126K |
|
3964
PUT
Packaging Corp of America
PKG
$22.2B
| $137K | ﹤0.01% |
13
-9
| -41% | -$912 |
|
3965
CALL
Plexus
PLXS
$6.43B
| $137K | ﹤0.01% |
22
+7
| +47% | +$415 |
|
|
3966
Plexus
PLXS
$6.43B
| $137K | ﹤0.01% |
+2,198
| New | +$130K |
|
|
CNSL
3967
PUT
DELISTED
Consolidated Communications Holdings, Inc.
CNSL
| $137K | ﹤0.01% |
289
+217
| +301% | +$1.02K |
|
|
PRTY
3968
DELISTED
Party City Holdco Inc.
PRTY
| $137K | ﹤0.01% |
24,121
+13,400
| +125% | +$76.4K |
|
3969
CALL
Ameren
AEE
$30.4B
| $136K | ﹤0.01% |
17
-1
| -6% | -$77 |
|
3970
CALL
PennyMac Financial
PFSI
$4.47B
| $136K | ﹤0.01% |
+45
| New | +$1.21K |
|
|
SA
3971
Seabridge Gold
SA
$2.72B
| $136K | ﹤0.01% |
+10,772
| New | +$153K |
|
3972
CALL
3D Systems Corp
DDD
$405M
| $135K | ﹤0.01% |
166
-321
| -66% | -$2.59K |
|
3973
PUT
Gogo Inc
GOGO
$525M
| $135K | ﹤0.01% |
224
+192
| +600% | +$905 |
|
3974
CALL
Laureate Education
LAUR
$5.38B
| $135K | ﹤0.01% |
82
+74
| +925% | +$1.24K |
|
3975
CALL
LifeVantage
LFVN
$80.1M
| $135K | ﹤0.01% |
99
-52
| -34% | -$634 |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.