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 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$42.6M |
| 2 |
Shopify
SHOP
|
+$39.6M |
| 3 |
iShares China Large-Cap ETF
FXI
|
+$35.4M |
| 4 |
Verizon
VZ
|
+$34.1M |
| 5 |
KraneShares CSI China Internet ETF
KWEB
|
+$34.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$49.5M |
| 2 |
GE Aerospace
GE
|
+$35.2M |
| 3 |
Carnival Corporation Ltd
CCL
|
+$30.5M |
| 4 |
Advanced Micro Devices
AMD
|
+$28.8M |
| 5 |
Micron Technology
MU
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.61% |
| 2 | Consumer Discretionary | 0.43% |
| 3 | Healthcare | 0.35% |
| 4 | Communication Services | 0.23% |
| 5 | Financials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CTXS
351
CALL
DELISTED
Citrix Systems Inc
CTXS
| $34.5M | 0.03% |
365,000
+359,100
| +6,086% | +$32.8M |
|
352
CALL
NextEra Energy
NEE
$186B
| $34.5M | 0.03% |
369,100
-141,100
| -28% | -$12.2M |
|
353
PUT
Best Buy
BBY
$18.4B
| $34.3M | 0.03% |
337,600
+72,600
| +27% | +$8.26M |
|
354
CALL
lululemon athletica
LULU
$12.9B
| $34.2M | 0.03% |
87,300
+52,200
| +149% | +$22.3M |
|
355
CALL
Altria Group
MO
$121B
| $34M | 0.03% |
717,600
+274,400
| +62% | +$12.6M |
|
356
CALL
Medtronic
MDT
$105B
| $34M | 0.03% |
328,700
+175,200
| +114% | +$20.3M |
|
|
B
357
PUT
Barrick Mining
B
$62.8B
| $33.9M | 0.03% |
1,784,500
+597,100
| +50% | +$11.3M |
|
358
CALL
Plug Power
PLUG
$3.11B
| $33.5M | 0.03% |
1,185,900
-121,100
| -9% | -$4.19M |
|
359
CALL
DoorDash
DASH
$77.4B
| $33.1M | 0.03% |
222,400
+112,900
| +103% | +$21.4M |
|
360
CALL
BP
BP
$112B
| $33.1M | 0.03% |
1,241,900
+55,600
| +5% | +$1.54M |
|
|
361
iShares China Large-Cap ETF
FXI
$4.29B
| $33M | 0.03% |
+902,666
| New | +$35.4M |
|
362
CALL
Lam Research
LRCX
$399B
| $32.7M | 0.03% |
455,000
-341,000
| -43% | -$21.4M |
|
363
PUT
Cleveland-Cliffs
CLF
$5.39B
| $32.6M | 0.03% |
1,499,600
+384,300
| +34% | +$8.28M |
|
364
CALL
Norwegian Cruise Line
NCLH
$8.87B
| $32.1M | 0.03% |
1,549,900
+167,000
| +12% | +$3.99M |
|
365
PUT
Rivian
RIVN
$24.9B
| $32.1M | 0.03% |
+309,600
| New | +$35.7M |
|
366
PUT
Automatic Data Processing
ADP
$97.2B
| $31.8M | 0.03% |
129,000
+96,400
| +296% | +$21.8M |
|
367
CALL
Marathon Digital Holdings
MARA
$4.73B
| $31.4M | 0.03% |
954,600
+294,700
| +45% | +$14.1M |
|
368
PUT
Southwest Airlines
LUV
$23.3B
| $31.3M | 0.03% |
730,600
+207,400
| +40% | +$9.74M |
|
369
CALL
eBay
EBAY
$49.3B
| $31.2M | 0.03% |
469,600
+55,100
| +13% | +$3.93M |
|
370
CALL
Proshares UltraShort Technology
REW
$3.3M
| $31.2M | 0.03% |
180,613
+133,963
| +287% | +$15.8M |
|
371
Merck
MRK
$315B
| $30.9M | 0.03% |
403,118
+364,902
| +955% | +$29.1M |
|
|
372
PUT
DoorDash
DASH
$77.4B
| $30.7M | 0.03% |
206,200
-7,200
| -3% | -$1.36M |
|
373
PUT
Marathon Petroleum
MPC
$92.2B
| $30.7M | 0.03% |
479,800
+224,400
| +88% | +$14.4M |
|
|
WBA
374
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $30.4M | 0.03% |
583,500
+211,700
| +57% | +$10.3M |
|
375
PUT
Capital One
COF
$124B
| $30.4M | 0.03% |
209,600
+37,700
| +22% | +$5.82M |
|
Similar funds
Simplex Trading's Q4 2021 Portfolio in Review
As of Q4 2021, Simplex Trading held 12,077 positions worth $99B, down 7.5% from $107B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading withdrew a net $10.8B in Q4 2021, closing 1,645 positions and reducing 4,258 holdings. Its most notable exit was Carnival Corporation Ltd, an estimated $30.5M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.61% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares China Large-Cap ETF worth $33M.
- Simplex Trading's largest Q4 2021 buy was iShares China Large-Cap ETF: 902,666 shares worth $33M.
- Simplex Trading added most to State Street Financial Select Sector SPDR ETF in Q4 2021, an estimated $42.6M increase.
- Simplex Trading's biggest Q4 2021 reduction was AMC Entertainment Holdings, cutting an estimated $49.5M.
- Simplex Trading fully exited Carnival Corporation Ltd in Q4 2021, selling an estimated $30.5M.
- Simplex Trading's ten largest holdings make up 33% of its $99B portfolio in Q4 2021.
- Simplex Trading opened 2,269 new positions and closed 1,645 in Q4 2021.
- Simplex Trading's portfolio value fell 7.5% quarter-over-quarter to $99B.
Based on Simplex Trading's 13F filing for Q4 2021, filed 4 Feb 2022.