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 | |
|---|---|---|---|---|---|---|
276
CALL
Abbott
ABT
$175B
| $43.5M | 0.04% |
371,100
+29,200
| +9% | +$3.59M |
|
277
CALL
3M
MMM
$89.1B
| $42.8M | 0.04% |
257,260
+10,286
| +4% | +$1.67M |
|
|
SCHW
278
PUT
Charles Schwab
SCHW
$175B
| $42.8M | 0.04% |
581,200
+35,700
| +7% | +$2.55M |
|
279
CALL
Nucor
NUE
$53.7B
| $42.7M | 0.04% |
441,400
-500
| -0.1% | -$53.2K |
|
280
PUT
Caesars Entertainment
CZR
$6.1B
| $42.1M | 0.04% |
408,800
-1,300
| -0.3% | -$127K |
|
281
PUT
Coca-Cola
KO
$354B
| $41.9M | 0.04% |
776,000
-4,600
| -0.6% | -$256K |
|
282
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $41.9M | 0.04% |
1,588,200
+59,000
| +4% | +$1.37M |
|
283
PUT
Zscaler
ZS
$23B
| $41.7M | 0.04% |
195,300
+2,900
| +2% | +$728K |
|
284
CALL
Lowe's Companies
LOW
$115B
| $41.6M | 0.04% |
212,600
+14,400
| +7% | +$2.87M |
|
285
PUT
Constellation Brands
STZ
$22.6B
| $41.2M | 0.04% |
+177,700
| New | +$38.8M |
|
286
CALL
Norwegian Cruise Line
NCLH
$8.87B
| $40.8M | 0.04% |
1,382,900
+65,300
| +5% | +$1.66M |
|
|
287
PUT
3M
MMM
$89.1B
| $40.3M | 0.04% |
241,951
+3,708
| +2% | +$601K |
|
288
PUT
American Express
AXP
$238B
| $40.2M | 0.04% |
240,800
-2,300
| -0.9% | -$385K |
|
289
PUT
Vale
VALE
$63.2B
| $40.2M | 0.04% |
1,817,400
+1,400
| +0.1% | +$27.5K |
|
290
PUT
Zillow
Z
$7.18B
| $40.1M | 0.04% |
332,100
+4,700
| +1% | +$475K |
|
291
CALL
Merck
MRK
$315B
| $40M | 0.04% |
1,295,000
+3,200
| +0.2% | +$243K |
|
292
CALL
Virgin Galactic
SPCE
$343M
| $40M | 0.04% |
46,350
-335
| -0.7% | -$199K |
|
293
PUT
PENN Entertainment
PENN
$2.8B
| $39.1M | 0.04% |
511,500
+7,700
| +2% | +$566K |
|
294
CALL
Unity
U
$12.8B
| $38.9M | 0.04% |
367,900
-17,400
| -5% | -$2.06M |
|
295
PUT
Seagate
STX
$205B
| $38.9M | 0.04% |
449,300
+12,400
| +3% | +$1.08M |
|
296
PUT
DoorDash
DASH
$77.4B
| $38.5M | 0.04% |
213,400
-400
| -0.2% | -$76.5K |
|
297
PUT
Riot Platforms
RIOT
$8.84B
| $38M | 0.04% |
1,049,300
+19,000
| +2% | +$612K |
|
298
CALL
NextEra Energy
NEE
$186B
| $37.9M | 0.04% |
510,200
-4,000
| -0.8% | -$323K |
|
299
CALL
Trade Desk
TTD
$8.26B
| $37.7M | 0.04% |
491,800
+20,100
| +4% | +$1.55M |
|
|
300
Carnival Corporation Ltd
CCL
$35.7B
| $37.6M | 0.04% |
1,428,103
-16,328
| -1% | -$380K |
|
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.