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 | |
|---|---|---|---|---|---|---|
1351
CALL
Vistra
VST
$55.1B
| $4.16M | ﹤0.01% |
224,200
+221,104
| +7,142% | +$3.82M |
|
1352
CALL
Lincoln National
LNC
$7.91B
| $4.15M | ﹤0.01% |
66,100
+65,453
| +10,116% | +$4.32M |
|
1353
iShares MSCI EAFE ETF
EFA
$76.4B
| $4.15M | ﹤0.01% |
52,583
+51,569
| +5,086% | +$4.1M |
|
1354
PUT
State Street
STT
$50.9B
| $4.15M | ﹤0.01% |
50,400
+49,801
| +8,314% | +$4.2M |
|
1355
Dow Inc
DOW
$21.6B
| $4.14M | ﹤0.01% |
+65,512
| New | +$4.33M |
|
1356
CALL
Cognizant
CTSH
$21.5B
| $4.14M | ﹤0.01% |
59,800
+59,597
| +29,358% | +$4.44M |
|
1357
Skyworks Solutions
SWKS
$9.06B
| $4.14M | ﹤0.01% |
21,574
-17,499
| -45% | -$3.11M |
|
1358
PUT
Affirm
AFRM
$23.5B
| $4.13M | ﹤0.01% |
61,400
+60,501
| +6,730% | +$3.86M |
|
1359
CALL
Amplify Online Retail ETF
IBUY
$106M
| $4.13M | ﹤0.01% |
84,800
+82,937
| +4,452% | +$10.2M |
|
1360
CALL
Tyson Foods
TSN
$20.2B
| $4.12M | ﹤0.01% |
55,900
+55,269
| +8,759% | +$4.29M |
|
1361
PUT
Stellantis
STLA
$16.5B
| $4.12M | ﹤0.01% |
209,100
+205,209
| +5,274% | +$3.86M |
|
1362
CALL
Ciena
CIEN
$55.3B
| $4.12M | ﹤0.01% |
72,400
+71,329
| +6,660% | +$3.93M |
|
1363
CALL
Agilent Technologies
A
$39.1B
| $4.11M | ﹤0.01% |
27,800
+27,501
| +9,198% | +$3.75M |
|
|
STMP
1364
CALL
DELISTED
Stamps.com, Inc.
STMP
| $4.11M | ﹤0.01% |
20,500
+20,373
| +16,042% | +$3.99M |
|
1365
CALL
Schwab US Broad Market ETF
SCHB
$42.8B
| $4.09M | ﹤0.01% |
322,800
+319,872
| +10,925% | +$5.41M |
|
1366
PUT
Scorpio Tankers
STNG
$3.96B
| $4.09M | ﹤0.01% |
185,400
+184,296
| +16,693% | +$3.74M |
|
|
WLL
1367
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $4.09M | ﹤0.01% |
116,600
+115,111
| +7,731% | +$4.94M |
|
1368
CALL
MP Materials
MP
$7.35B
| $4.08M | ﹤0.01% |
110,800
+108,498
| +4,713% | +$3.37M |
|
1369
PUT
Winnebago Industries
WGO
$870M
| $4.08M | ﹤0.01% |
60,100
+59,931
| +35,462% | +$4.42M |
|
1370
CALL
Nano X Imaging
NNOX
$62.4M
| $4.08M | ﹤0.01% |
127,400
+125,767
| +7,702% | +$3.83M |
|
|
CVAC
1371
CALL
DELISTED
CureVac
CVAC
| $4.08M | ﹤0.01% |
55,500
+54,758
| +7,380% | +$5.47M |
|
|
RWT
1372
PUT
Redwood Trust
RWT
$616M
| $4.08M | ﹤0.01% |
337,700
+331,697
| +5,526% | +$3.7M |
|
|
VISN
1373
PUT
Vistance Networks Inc
VISN
$2.66B
| $4.07M | ﹤0.01% |
191,000
+188,196
| +6,712% | +$3.51M |
|
1374
Fair Isaac
FICO
$28.7B
| $4.07M | ﹤0.01% |
8,097
-758
| -9% | -$383K |
|
1375
TJX Companies
TJX
$170B
| $4.06M | ﹤0.01% |
60,165
+60,085
| +75,106% | +$4.1M |
|
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.