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 | |
|---|---|---|---|---|---|---|
426
CALL
Capital One
COF
$124B
| $21.6M | 0.02% |
137,600
+1,400
| +1% | +$228K |
|
|
BBBY
427
PUT
DELISTED
Bed Bath & Beyond Inc
BBBY
| $21.6M | 0.02% |
661,200
+7,500
| +1% | +$203K |
|
|
SCIU
428
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $21.4M | 0.02% |
610,400
-10,800
| -2% | -$379K |
|
|
SHNY
429
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $21.4M | 0.02% |
968,000
-4,800
| -0.5% | -$106K |
|
430
CALL
Accenture
ACN
$85.7B
| $21.4M | 0.02% |
71,300
-100
| -0.1% | -$32.5K |
|
431
PUT
Devon Energy
DVN
$51.8B
| $21.4M | 0.02% |
712,800
+7,300
| +1% | +$207K |
|
|
432
PUT
GE Aerospace
GE
$354B
| $21.3M | 0.02% |
2,530,429
+2,212,199
| +695% | +$142M |
|
433
PUT
Palo Alto Networks
PANW
$273B
| $21.2M | 0.02% |
343,800
+37,800
| +12% | +$2.66M |
|
434
CALL
Altria Group
MO
$121B
| $21.2M | 0.02% |
443,200
+7,800
| +2% | +$377K |
|
435
CALL
Workday
WDAY
$32.7B
| $21.2M | 0.02% |
90,000
+7,000
| +8% | +$1.73M |
|
436
PUT
American Tower
AMT
$77.4B
| $21.1M | 0.02% |
78,000
+3,500
| +5% | +$998K |
|
437
CALL
Toronto Dominion Bank
TD
$200B
| $21.1M | 0.02% |
297,900
+5,900
| +2% | +$393K |
|
438
CALL
Datadog
DDOG
$87.5B
| $21M | 0.02% |
200,800
+3,200
| +2% | +$404K |
|
|
PXD
439
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $21M | 0.02% |
125,300
+4,000
| +3% | +$605K |
|
440
CALL
Dell
DELL
$285B
| $21M | 0.02% |
419,065
-4,538
| -1% | -$226K |
|
441
PUT
TAL Education Group
TAL
$5.73B
| $20.8M | 0.02% |
890,800
-500
| -0.1% | -$4.44K |
|
|
442
Alibaba
BABA
$279B
| $20.8M | 0.02% |
93,649
+34,005
| +57% | +$6.19M |
|
|
443
PUT
Altria Group
MO
$121B
| $20.8M | 0.02% |
433,900
+65,200
| +18% | +$3.15M |
|
444
PUT
SLB Ltd
SLB
$71.3B
| $20.7M | 0.02% |
624,600
+9,900
| +2% | +$284K |
|
445
CALL
Zillow
Z
$7.18B
| $20.6M | 0.02% |
170,900
+8,000
| +5% | +$809K |
|
446
CALL
Kimberly-Clark
KMB
$36.1B
| $20.5M | 0.02% |
153,800
-5,700
| -4% | -$775K |
|
447
PUT
WIX.com
WIX
$2.04B
| $20.4M | 0.02% |
69,900
| – | – |
|
448
PUT
Blackstone
BX
$150B
| $20.3M | 0.02% |
209,100
+18,900
| +10% | +$2.19M |
|
449
CALL
Marathon Digital Holdings
MARA
$4.73B
| $20.3M | 0.02% |
659,900
+21,100
| +3% | +$686K |
|
450
CALL
ConocoPhillips
COP
$145B
| $20.1M | 0.02% |
320,100
+10,100
| +3% | +$583K |
|
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.