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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SFIX
1051
CALL
Stitch Fix
SFIX
$464M
| $5.84M | 0.01% |
96,800
+95,264
| +6,202% | +$4.88M |
|
1052
CALL
Sonos
SONO
$1.73B
| $5.83M | 0.01% |
165,600
+164,274
| +12,389% | +$6.15M |
|
1053
CALL
Welltower
WELL
$177B
| $5.83M | 0.01% |
70,200
+69,627
| +12,151% | +$5.33M |
|
|
SPR
1054
DELISTED
Spirit AeroSystems
SPR
| $5.82M | 0.01% |
123,338
+84,215
| +215% | +$3.99M |
|
1055
Caterpillar
CAT
$412B
| $5.82M | 0.01% |
+26,735
| New | +$6.17M |
|
|
IRBT
1056
PUT
DELISTED
iRobot
IRBT
| $5.82M | 0.01% |
+62,300
| New | +$6.39M |
|
1057
PUT
GoodRx Holdings
GDRX
$965M
| $5.8M | 0.01% |
161,200
+159,297
| +8,371% | +$5.88M |
|
1058
PUT
NRG Energy
NRG
$30B
| $5.8M | 0.01% |
+143,900
| New | +$5.21M |
|
1059
PUT
Crown Castle
CCI
$33.3B
| $5.79M | 0.01% |
29,700
+29,398
| +9,734% | +$5.5M |
|
1060
QuantumScape Corp
QS
$2.97B
| $5.79M | 0.01% |
197,994
+192,644
| +3,601% | +$6.23M |
|
|
MIC
1061
PUT
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $5.79M | 0.01% |
151,300
+149,736
| +9,574% | +$5.27M |
|
|
1062
CALL
NRG Energy
NRG
$30B
| $5.77M | 0.01% |
+143,100
| New | +$5.18M |
|
1063
CALL
United Natural Foods
UNFI
$2.96B
| $5.76M | 0.01% |
+155,900
| New | +$5.67M |
|
1064
CALL
KE Holdings
BEKE
$16.9B
| $5.76M | 0.01% |
120,900
+120,193
| +17,000% | +$6.14M |
|
1065
Fiverr
FVRR
$379M
| $5.76M | 0.01% |
23,751
-7,777
| -25% | -$1.61M |
|
1066
CALL
Zoetis
ZTS
$31.6B
| $5.76M | 0.01% |
+30,900
| New | +$5.37M |
|
1067
PUT
Planet Fitness
PLNT
$4.31B
| $5.76M | 0.01% |
76,500
+75,659
| +8,996% | +$6.02M |
|
1068
CALL
Cboe Global Markets
CBOE
$29.6B
| $5.74M | 0.01% |
+48,200
| New | +$5.29M |
|
1069
CALL
AerCap
AER
$23.9B
| $5.74M | 0.01% |
+112,000
| New | +$6.46M |
|
1070
PUT
Sysco
SYY
$39.7B
| $5.71M | 0.01% |
73,500
+72,935
| +12,909% | +$5.89M |
|
1071
CALL
JetBlue
JBLU
$1.89B
| $5.68M | 0.01% |
338,800
+337,513
| +26,225% | +$6.54M |
|
1072
PUT
Alnylam Pharmaceuticals
ALNY
$36B
| $5.68M | 0.01% |
33,500
+33,333
| +19,960% | +$4.88M |
|
|
HIMX
1073
PUT
Himax Technologies
HIMX
$2.21B
| $5.68M | 0.01% |
+340,700
| New | +$4.5M |
|
1074
CALL
Amphenol
APH
$190B
| $5.66M | 0.01% |
165,600
+165,446
| +107,432% | +$5.59M |
|
|
SRNE
1075
CALL
DELISTED
Sorrento Therapeutics, Inc.
SRNE
| $5.66M | 0.01% |
+583,900
| New | +$4.65M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.