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 | |
|---|---|---|---|---|---|---|
|
RDFN
826
PUT
DELISTED
Redfin
RDFN
| $8.18M | 0.01% |
+129,000
| New | +$7.89M |
|
827
CALL
Cigna
CI
$75.7B
| $8.18M | 0.01% |
34,500
+34,113
| +8,815% | +$8.52M |
|
828
CALL
Corning
GLW
$134B
| $8.17M | 0.01% |
199,700
+197,844
| +10,660% | +$8.62M |
|
829
CALL
Steel Dynamics
STLD
$34.7B
| $8.14M | 0.01% |
136,600
+136,046
| +24,557% | +$7.98M |
|
|
TIGR
830
PUT
UP Fintech Holding
TIGR
$870M
| $8.13M | 0.01% |
280,700
+277,957
| +10,133% | +$5.91M |
|
831
PUT
Appian
APPN
$1.61B
| $8.13M | 0.01% |
59,000
+58,723
| +21,200% | +$6.67M |
|
832
Datadog
DDOG
$87B
| $8.12M | 0.01% |
78,011
+16,177
| +26% | +$1.46M |
|
833
CALL
Agnico Eagle Mines
AEM
$72.3B
| $8.12M | 0.01% |
+134,300
| New | +$8.96M |
|
834
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $8.12M | 0.01% |
334,800
+330,202
| +7,181% | +$32.7M |
|
835
PUT
Avis
CAR
$5.62B
| $8.05M | 0.01% |
+103,400
| New | +$8.57M |
|
836
CALL
Ally Financial
ALLY
$13.4B
| $8.01M | 0.01% |
160,800
+158,182
| +6,042% | +$8.12M |
|
837
CALL
The Mosaic Company
MOS
$7.08B
| $8.01M | 0.01% |
+250,900
| New | +$8.51M |
|
838
PUT
Duke Energy
DUK
$101B
| $8M | 0.01% |
81,000
+80,473
| +15,270% | +$8.08M |
|
839
CALL
United Rentals
URI
$71.4B
| $7.97M | 0.01% |
25,000
+24,857
| +17,383% | +$8.03M |
|
|
JMIA
840
CALL
Jumia Technologies
JMIA
$734M
| $7.96M | 0.01% |
262,500
+261,615
| +29,561% | +$7.92M |
|
841
CALL
Toll Brothers
TOL
$13.7B
| $7.94M | 0.01% |
137,300
+136,007
| +10,519% | +$8.29M |
|
842
BlackBerry
BB
$5.06B
| $7.93M | 0.01% |
649,282
+338,382
| +109% | +$3.54M |
|
|
ABB
843
CALL
DELISTED
ABB Ltd
ABB
| $7.93M | 0.01% |
233,200
+231,013
| +10,563% | +$7.72M |
|
844
PUT
Progressive
PGR
$120B
| $7.92M | 0.01% |
+80,600
| New | +$7.97M |
|
845
Mercado Libre
MELI
$91.2B
| $7.91M | 0.01% |
5,078
+2,785
| +121% | +$4.09M |
|
|
846
CALL
Duke Energy
DUK
$101B
| $7.91M | 0.01% |
80,100
+79,316
| +10,117% | +$7.97M |
|
|
FL
847
PUT
DELISTED
Foot Locker
FL
| $7.91M | 0.01% |
128,300
+127,201
| +11,574% | +$7.69M |
|
848
PUT
Trip.com Group
TCOM
$27.1B
| $7.91M | 0.01% |
223,000
+221,398
| +13,820% | +$8.44M |
|
849
CALL
NetEase
NTES
$76.9B
| $7.91M | 0.01% |
68,600
+67,814
| +8,628% | +$7.47M |
|
850
PUT
BioMarin Pharmaceuticals
BMRN
$11.4B
| $7.88M | 0.01% |
94,500
+93,673
| +11,327% | +$7.43M |
|
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.