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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
CALL
Deere & Co
DE
$164B
| $29.4M | 0.03% |
82,900
+7,200
| +10% | +$2.59M |
|
352
CALL
Seagate
STX
$205B
| $29.3M | 0.03% |
338,600
+10,800
| +3% | +$940K |
|
353
PUT
Abbott
ABT
$175B
| $29.2M | 0.03% |
249,600
+34,300
| +16% | +$4.21M |
|
354
CALL
Darden Restaurants
DRI
$22.2B
| $29.2M | 0.03% |
196,800
+19,100
| +11% | +$2.81M |
|
355
CALL
Cleveland-Cliffs
CLF
$5.39B
| $29M | 0.03% |
1,315,100
+52,300
| +4% | +$1.19M |
|
356
Baidu
BIDU
$36.6B
| $29M | 0.03% |
143,736
-208
| -0.1% | -$34.2K |
|
357
CALL
eBay
EBAY
$49.3B
| $28.9M | 0.03% |
414,500
+16,300
| +4% | +$1.17M |
|
358
CALL
Rio Tinto
RIO
$150B
| $28.8M | 0.03% |
348,200
-5,400
| -2% | -$421K |
|
359
PUT
Philip Morris
PM
$303B
| $28.7M | 0.03% |
287,300
+2,700
| +0.9% | +$272K |
|
360
PUT
FuboTV Inc
FUBO
$265M
| $28.5M | 0.03% |
76,800
+9,833
| +15% | +$3.22M |
|
361
AT&T
T
$160B
| $28.4M | 0.03% |
1,290,659
-20,521
| -2% | -$431K |
|
362
CALL
Cameco
CCJ
$39.4B
| $28.3M | 0.03% |
1,462,600
+13,400
| +0.9% | +$254K |
|
363
PUT
Virgin Galactic
SPCE
$343M
| $28.3M | 0.03% |
32,750
+1,800
| +6% | +$1.07M |
|
364
PUT
Okta
OKTA
$23.8B
| $28.2M | 0.03% |
117,200
+2,000
| +2% | +$497K |
|
365
PUT
Southwest Airlines
LUV
$23.3B
| $28.2M | 0.03% |
523,200
-4,500
| -0.9% | -$227K |
|
|
COUP
366
CALL
DELISTED
Coupa Software Incorporated
COUP
| $27.8M | 0.03% |
105,900
+700
| +0.7% | +$164K |
|
|
RDS.A
367
CALL
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $27.6M | 0.03% |
674,600
+18,700
| +3% | +$754K |
|
368
CALL
Spotify
SPOT
$97.5B
| $27.2M | 0.03% |
101,400
+3,300
| +3% | +$778K |
|
369
PUT
Marriott International
MAR
$97.5B
| $27.2M | 0.03% |
195,400
+4,400
| +2% | +$614K |
|
370
CALL
Riot Platforms
RIOT
$8.84B
| $27.1M | 0.03% |
747,300
+22,900
| +3% | +$737K |
|
371
PUT
Tilray
TLRY
$514M
| $27M | 0.03% |
167,340
+8,930
| +6% | +$1.22M |
|
372
PUT
Capital One
COF
$124B
| $27M | 0.03% |
171,900
+10,600
| +7% | +$1.73M |
|
373
PUT
Electronic Arts
EA
$52.4B
| $27M | 0.03% |
189,900
-100
| -0.1% | -$14K |
|
374
CALL
Novavax
NVAX
$1.3B
| $26.9M | 0.03% |
124,900
+8,500
| +7% | +$1.87M |
|
|
LOGC
375
PUT
DELISTED
ContextLogic
LOGC
| $26.9M | 0.03% |
73,277
+1,667
| +2% | +$415K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.