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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2026
CALL
AMC Global Media
AMCX
$430M
| $964K | ﹤0.01% |
170
+160
| +1,600% | +$9.83K |
|
|
AXON
2027
PUT
Axon Enterprise
AXON
$40.5B
| $963K | ﹤0.01% |
177
+9
| +5% | +$461 |
|
2028
PUT
LGI Homes
LGIH
$1.4B
| $963K | ﹤0.01% |
160
+61
| +62% | +$3.53K |
|
2029
CALL
TC Energy
TRP
$73.5B
| $961K | ﹤0.01% |
214
+55
| +35% | +$2.36K |
|
2030
Stryker
SYK
$127B
| $959K | ﹤0.01% |
+4,858
| New | +$874K |
|
|
BPT
2031
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $957K | ﹤0.01% |
360
+247
| +219% | +$6.21K |
|
2032
CALL
Trupanion
TRUP
$1.05B
| $956K | ﹤0.01% |
292
+264
| +943% | +$7.51K |
|
2033
CALL
Medpace
MEDP
$16.8B
| $955K | ﹤0.01% |
162
+152
| +1,520% | +$9.08K |
|
2034
CALL
Ball Corp
BALL
$17B
| $954K | ﹤0.01% |
165
-131
| -44% | -$6.98K |
|
2035
CALL
SL Green Realty
SLG
$3.88B
| $953K | ﹤0.01% |
109
+53
| +95% | +$4.59K |
|
2036
CALL
Ericsson
ERIC
$30.7B
| $952K | ﹤0.01% |
1,038
+931
| +870% | +$8.41K |
|
2037
PUT
Qualys
QLYS
$4.84B
| $951K | ﹤0.01% |
115
+79
| +219% | +$6.58K |
|
2038
Tenaris
TS
$29.1B
| $951K | ﹤0.01% |
33,699
+29,506
| +704% | +$762K |
|
2039
Zions Bancorporation
ZION
$10.1B
| $951K | ﹤0.01% |
20,957
-1,487
| -7% | -$70.9K |
|
2040
CALL
Cintas
CTAS
$82.4B
| $949K | ﹤0.01% |
188
+36
| +24% | +$1.74K |
|
2041
CALL
SolarEdge
SEDG
$2.59B
| $949K | ﹤0.01% |
252
-210
| -45% | -$8.39K |
|
2042
Zscaler
ZS
$23B
| $949K | ﹤0.01% |
13,382
+10,619
| +384% | +$564K |
|
|
AXON
2043
CALL
Axon Enterprise
AXON
$40.5B
| $946K | ﹤0.01% |
174
-97
| -36% | -$4.97K |
|
2044
CALL
NCR Voyix
VYX
$1.06B
| $946K | ﹤0.01% |
566
+437
| +339% | +$7.24K |
|
|
BEAT
2045
CALL
DELISTED
BioTelemetry, Inc.
BEAT
| $945K | ﹤0.01% |
151
-13
| -8% | -$893 |
|
2046
Arlo Technologies
ARLO
$1.4B
| $944K | ﹤0.01% |
+228,746
| New | +$1.27M |
|
2047
CALL
Golar LNG
GLNG
$4.95B
| $944K | ﹤0.01% |
448
+277
| +162% | +$6.11K |
|
|
ETFC
2048
DELISTED
E*Trade Financial Corporation
ETFC
| $943K | ﹤0.01% |
20,325
-13,352
| -40% | -$636K |
|
|
PS
2049
PUT
DELISTED
Pluralsight, Inc. Class A Common Stock
PS
| $942K | ﹤0.01% |
297
+166
| +127% | +$4.91K |
|
2050
CALL
Digital Realty Trust
DLR
$73.7B
| $940K | ﹤0.01% |
79
-69
| -47% | -$7.7K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.