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 | |
|---|---|---|---|---|---|---|
1126
CALL
Amdocs
DOX
$5.53B
| $2.62M | 0.01% |
396
+185
| +88% | +$11.9K |
|
1127
PUT
Silicon Laboratories
SLAB
$7.15B
| $2.62M | 0.01% |
235
+213
| +968% | +$23.1K |
|
|
X
1128
PUT
DELISTED
US Steel
X
| $2.62M | 0.01% |
2,265
-423
| -16% | -$5.45K |
|
|
BBBY
1129
PUT
DELISTED
Bed Bath & Beyond Inc
BBBY
| $2.62M | 0.01% |
2,458
+614
| +33% | +$5.92K |
|
1130
CALL
Cooper Companies
COO
$13.7B
| $2.61M | 0.01% |
352
+332
| +1,660% | +$26.8K |
|
1131
PUT
Progressive
PGR
$124B
| $2.61M | 0.01% |
338
-83
| -20% | -$6.53K |
|
1132
CALL
Copa Holdings
CPA
$5.56B
| $2.6M | 0.01% |
263
+164
| +166% | +$16.5K |
|
1133
PUT
Synopsys
SNPS
$71.5B
| $2.59M | 0.01% |
189
-239
| -56% | -$32.3K |
|
1134
Zscaler
ZS
$23B
| $2.59M | 0.01% |
54,895
+54,364
| +10,238% | +$3.92M |
|
1135
CALL
Canadian Solar
CSIQ
$906M
| $2.59M | 0.01% |
1,372
+1,135
| +479% | +$24.7K |
|
1136
PUT
LKQ Corp
LKQ
$6.58B
| $2.58M | 0.01% |
822
+797
| +3,188% | +$21.8K |
|
1137
PUT
Weibo
WB
$1.9B
| $2.56M | 0.01% |
573
-675
| -54% | -$28.6K |
|
|
BLUE
1138
PUT
DELISTED
bluebird bio
BLUE
| $2.56M | 0.01% |
22
+4
| +22% | +$6.11K |
|
1139
CALL
Targa Resources
TRGP
$60.4B
| $2.56M | 0.01% |
637
-78
| -11% | -$2.98K |
|
1140
PUT
Stanley Black & Decker
SWK
$14.2B
| $2.56M | 0.01% |
177
-71
| -29% | -$10K |
|
1141
CALL
Aptiv
APTV
$12B
| $2.55M | 0.01% |
292
+237
| +431% | +$19.8K |
|
1142
MongoDB
MDB
$24B
| $2.55M | 0.01% |
21,154
+15,830
| +297% | +$2.28M |
|
1143
CALL
Aflac
AFL
$63.9B
| $2.54M | 0.01% |
486
-282
| -37% | -$14.9K |
|
1144
PUT
Toyota
TM
$210B
| $2.54M | 0.01% |
189
-320
| -63% | -$41.9K |
|
|
WORK
1145
PUT
DELISTED
Slack Technologies, Inc.
WORK
| $2.54M | 0.01% |
1,071
+810
| +310% | +$24.5K |
|
1146
PUT
Emerson Electric
EMR
$82.9B
| $2.54M | 0.01% |
380
+137
| +56% | +$8.61K |
|
|
S
1147
PUT
DELISTED
Sprint Corporation
S
| $2.54M | 0.01% |
4,112
-496
| -11% | -$3.41K |
|
1148
PUT
BorgWarner
BWA
$13.2B
| $2.53M | 0.01% |
784
+268
| +52% | +$8.63K |
|
1149
PUT
Crown Holdings
CCK
$12.8B
| $2.53M | 0.01% |
383
+121
| +46% | +$7.75K |
|
|
CERN
1150
CALL
DELISTED
Cerner Corp
CERN
| $2.53M | 0.01% |
371
-273
| -42% | -$19.3K |
|
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.