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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2051
Vulcan Materials
VMC
$36.3B
| $852K | ﹤0.01% |
+6,205
| New | +$792K |
|
2052
PUT
Elastic
ESTC
$6.1B
| $851K | ﹤0.01% |
114
-129
| -53% | -$10.5K |
|
2053
CALL
Hormel Foods
HRL
$13.9B
| $851K | ﹤0.01% |
210
+147
| +233% | +$5.96K |
|
2054
PUT
Floor & Decor
FND
$5.81B
| $850K | ﹤0.01% |
203
+53
| +35% | +$2.21K |
|
2055
PUT
Eaton
ETN
$157B
| $849K | ﹤0.01% |
102
+23
| +29% | +$1.86K |
|
2056
PUT
GoDaddy
GDDY
$12.3B
| $848K | ﹤0.01% |
121
-303
| -71% | -$22.9K |
|
|
ITCI
2057
PUT
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $848K | ﹤0.01% |
654
+428
| +189% | +$5.49K |
|
2058
Robert Half
RHI
$3.61B
| $847K | ﹤0.01% |
+14,866
| New | +$887K |
|
2059
CALL
Sunrun
RUN
$2.37B
| $847K | ﹤0.01% |
452
+237
| +110% | +$3.85K |
|
2060
CALL
Service Corp International
SCI
$11.4B
| $846K | ﹤0.01% |
181
-29
| -14% | -$1.25K |
|
2061
CALL
GameStop
GME
$9.5B
| $840K | ﹤0.01% |
6,148
+464
| +8% | +$907 |
|
2062
CALL
Quanta Services
PWR
$93.9B
| $840K | ﹤0.01% |
220
+25
| +13% | +$949 |
|
2063
CALL
Rambus
RMBS
$10.4B
| $840K | ﹤0.01% |
698
-710
| -50% | -$8.13K |
|
2064
PUT
Semtech
SMTC
$11.7B
| $836K | ﹤0.01% |
174
+44
| +34% | +$2.14K |
|
|
SPPI
2065
PUT
DELISTED
Spectrum Pharmaceuticals Inc
SPPI
| $836K | ﹤0.01% |
972
+873
| +882% | +$7.81K |
|
|
MIME
2066
CALL
DELISTED
Mimecast Limited
MIME
| $836K | ﹤0.01% |
179
+178
| +17,800% | +$8.47K |
|
2067
CALL
Helen of Troy
HELE
$663M
| $835K | ﹤0.01% |
64
-84
| -57% | -$11K |
|
2068
CALL
Puma Biotechnology
PBYI
$406M
| $835K | ﹤0.01% |
657
-175
| -21% | -$4.03K |
|
2069
CALL
Pacira BioSciences
PCRX
$1.02B
| $835K | ﹤0.01% |
192
+185
| +2,643% | +$7.85K |
|
2070
Cal-Maine
CALM
$4.28B
| $833K | ﹤0.01% |
+19,971
| New | +$822K |
|
2071
CALL
CDW
CDW
$17.1B
| $832K | ﹤0.01% |
75
-118
| -61% | -$12.4K |
|
|
TBCH
2072
PUT
Turtle Beach Corp
TBCH
$239M
| $831K | ﹤0.01% |
719
-531
| -42% | -$5.63K |
|
|
AD
2073
CALL
Array Digital Infrastructure
AD
$3.02B
| $830K | ﹤0.01% |
+186
| New | +$8.69K |
|
2074
CALL
Louisiana-Pacific
LPX
$5.2B
| $828K | ﹤0.01% |
316
+19
| +6% | +$466 |
|
|
CHL
2075
CALL
DELISTED
China Mobile Limited
CHL
| $828K | ﹤0.01% |
183
+138
| +307% | +$6.42K |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.