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 | |
|---|---|---|---|---|---|---|
851
Simon Property Group
SPG
$73B
| $7.87M | 0.01% |
60,354
-6,905
| -10% | -$858K |
|
852
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$3.45B
| $7.86M | 0.01% |
81,297
+80,860
| +18,503% | +$7.06M |
|
853
CALL
Atossa Therapeutics
ATOS
$24M
| $7.85M | 0.01% |
82,853
+82,549
| +27,154% | +$4.37M |
|
854
PUT
Northrop Grumman
NOC
$75.8B
| $7.85M | 0.01% |
21,600
+21,280
| +6,650% | +$7.66M |
|
855
PUT
Kraft Heinz
KHC
$30.1B
| $7.85M | 0.01% |
192,400
+190,251
| +8,853% | +$8.01M |
|
856
CALL
KLA
KLAC
$286B
| $7.84M | 0.01% |
242,000
+241,190
| +29,777% | +$7.73M |
|
857
CALL
T. Rowe Price
TROW
$24.6B
| $7.84M | 0.01% |
39,600
+39,217
| +10,239% | +$7.33M |
|
858
CALL
Restaurant Brands International
QSR
$25.1B
| $7.76M | 0.01% |
120,500
+119,757
| +16,118% | +$8.07M |
|
859
IBM
IBM
$195B
| $7.74M | 0.01% |
55,238
+44,921
| +435% | +$6.14M |
|
860
CALL
NXP Semiconductors
NXPI
$70B
| $7.74M | 0.01% |
+37,600
| New | +$7.53M |
|
861
CALL
Southern Company
SO
$109B
| $7.73M | 0.01% |
127,700
+126,863
| +15,157% | +$8.11M |
|
862
Airbnb
ABNB
$81.6B
| $7.71M | 0.01% |
50,379
+44,180
| +713% | +$6.93M |
|
863
CALL
AGNC Investment
AGNC
$12.3B
| $7.69M | 0.01% |
455,500
+453,483
| +22,483% | +$8.06M |
|
|
CPE
864
PUT
DELISTED
Callon Petroleum Company
CPE
| $7.67M | 0.01% |
+133,000
| New | +$5.59M |
|
865
CALL
StoneCo
STNE
$2.67B
| $7.66M | 0.01% |
114,300
+112,901
| +8,070% | +$7.32M |
|
866
PUT
Aramark
ARMK
$15B
| $7.65M | 0.01% |
284,341
+278,282
| +4,593% | +$7.64M |
|
867
PUT
Asana
ASAN
$1.51B
| $7.64M | 0.01% |
123,200
+122,741
| +26,741% | +$4.74M |
|
|
ZNGA
868
CALL
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
| $7.64M | 0.01% |
+718,400
| New | +$7.57M |
|
869
PUT
Ollie's Bargain Outlet
OLLI
$3.94B
| $7.62M | 0.01% |
90,600
+90,105
| +18,203% | +$7.84M |
|
870
Aon
AON
$76B
| $7.62M | 0.01% |
31,923
+23,812
| +294% | +$5.82M |
|
|
OZON
871
CALL
DELISTED
Ozon Holdings PLC American Depositary Shares, each ADS representing one ordinary share
OZON
| $7.61M | 0.01% |
129,900
+129,363
| +24,090% | +$7.53M |
|
872
Altria Group
MO
$120B
| $7.59M | 0.01% |
159,197
-45,341
| -22% | -$2.23M |
|
873
PUT
Corteva
CTVA
$59.4B
| $7.58M | 0.01% |
171,000
+169,641
| +12,483% | +$7.84M |
|
874
PUT
Amplify Junior Silver Miners ETF
SILJ
$3.28B
| $7.58M | 0.01% |
408,700
+405,115
| +11,300% | +$6.58M |
|
|
875
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.6B
| $7.55M | 0.01% |
21,896
-75,857
| -78% | -$25.9M |
|
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.