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 | |
|---|---|---|---|---|---|---|
401
PUT
ConocoPhillips
COP
$145B
| $24.3M | 0.02% |
386,400
+6,700
| +2% | +$387K |
|
402
PUT
Rocket Companies
RKT
$38B
| $24.3M | 0.02% |
1,277,700
+105,900
| +9% | +$1.85M |
|
403
PUT
Bristol-Myers Squibb
BMY
$124B
| $24.3M | 0.02% |
364,500
+5,700
| +2% | +$375K |
|
404
PUT
Fastly Inc
FSLY
$3.2B
| $24.2M | 0.02% |
417,200
+13,200
| +3% | +$609K |
|
405
PUT
PNC Financial Services
PNC
$101B
| $24.1M | 0.02% |
125,900
| – | – |
|
406
PUT
Autodesk
ADSK
$43B
| $24.1M | 0.02% |
82,000
+2,300
| +3% | +$704K |
|
407
PUT
Nucor
NUE
$53.7B
| $23.8M | 0.02% |
246,000
| – | – |
|
408
PUT
First Solar
FSLR
$22.4B
| $23.8M | 0.02% |
263,400
+2,100
| +0.8% | +$195K |
|
409
CALL
Futu Holdings
FUTU
$14.9B
| $23.6M | 0.02% |
146,700
+33,600
| +30% | +$3.71M |
|
410
Intel
INTC
$516B
| $23.5M | 0.02% |
419,762
+31,090
| +8% | +$1.69M |
|
411
PUT
lululemon athletica
LULU
$12.9B
| $23.2M | 0.02% |
63,600
+4,900
| +8% | +$1.96M |
|
412
PUT
Carvana
CVNA
$44.9B
| $22.9M | 0.02% |
372,000
+8,500
| +2% | +$565K |
|
413
PUT
Prudential Financial
PRU
$41.3B
| $22.9M | 0.02% |
221,500
-700
| -0.3% | -$72.1K |
|
|
414
CALL
Carvana
CVNA
$44.9B
| $22.9M | 0.02% |
371,000
+15,500
| +4% | +$1.03M |
|
415
CALL
BlackBerry
BB
$5.25B
| $22.6M | 0.02% |
1,859,500
-11,700
| -0.6% | -$123K |
|
|
WBA
416
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $22.6M | 0.02% |
464,300
+139,300
| +43% | +$6.72M |
|
417
CALL
Skyworks Solutions
SWKS
$9.5B
| $22.5M | 0.02% |
119,300
+9,300
| +8% | +$1.7M |
|
418
PUT
Honeywell
HON
$73.8B
| $22.5M | 0.02% |
108,116
-1,273
| -1% | -$271K |
|
419
CALL
Workhorse Group
WKHS
$30.4M
| $22.4M | 0.02% |
476
+7
| +1% | +$212K |
|
420
CALL
Occidental Petroleum
OXY
$57.2B
| $22.2M | 0.02% |
768,200
+164,700
| +27% | +$4.4M |
|
421
PUT
Marathon Digital Holdings
MARA
$4.73B
| $22.1M | 0.02% |
721,400
+3,000
| +0.4% | +$97.5K |
|
422
PUT
QuantumScape Corp
QS
$3.61B
| $22.1M | 0.02% |
798,900
+7,300
| +0.9% | +$167K |
|
423
CALL
Diamondback Energy
FANG
$57.1B
| $22.1M | 0.02% |
222,000
+4,200
| +2% | +$337K |
|
424
CALL
Chegg
CHGG
$99.9M
| $22M | 0.02% |
264,300
+100
| +0% | +$8.14K |
|
|
LOGC
425
DELISTED
ContextLogic
LOGC
| $21.9M | 0.02% |
59,639
+7,224
| +14% | +$1.8M |
|
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.