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 | |
|---|---|---|---|---|---|---|
2926
Mattel
MAT
$4.3B
| $950K | ﹤0.01% |
44,103
+3,076
| +7% | +$64.5K |
|
2927
CALL
Targa Resources
TRGP
$57.4B
| $950K | ﹤0.01% |
18,200
+5,200
| +40% | +$279K |
|
|
GDEN
2928
CALL
DELISTED
Golden Entertainment
GDEN
| $949K | ﹤0.01% |
18,800
+16,300
| +652% | +$807K |
|
2929
VanEck Gold Miners ETF
GDX
$23.2B
| $949K | ﹤0.01% |
29,642
-186,100
| -86% | -$5.94M |
|
2930
CALL
Gold Fields
GFI
$29.4B
| $949K | ﹤0.01% |
86,400
+9,300
| +12% | +$92.8K |
|
2931
CALL
Pacific Biosciences
PACB
$422M
| $949K | ﹤0.01% |
46,400
+13,500
| +41% | +$326K |
|
|
AYX
2932
PUT
DELISTED
Alteryx Inc
AYX
| $949K | ﹤0.01% |
15,700
-4,900
| -24% | -$338K |
|
2933
CALL
Landstar System
LSTR
$6.5B
| $948K | ﹤0.01% |
+5,300
| New | +$909K |
|
2934
PUT
Mercury Systems
MRCY
$6.23B
| $947K | ﹤0.01% |
17,200
+16,900
| +5,633% | +$856K |
|
2935
CALL
Robert Half
RHI
$4.07B
| $947K | ﹤0.01% |
8,500
+1,700
| +25% | +$189K |
|
2936
PUT
Xylem
XYL
$28.6B
| $947K | ﹤0.01% |
7,900
+5,900
| +295% | +$732K |
|
2937
Opko Health
OPK
$936M
| $946K | ﹤0.01% |
+196,852
| New | +$797K |
|
|
SRAX
2938
CALL
DELISTED
SRAX, Inc. Class A Common Stock
SRAX
| $946K | ﹤0.01% |
210,900
+164,000
| +350% | +$861K |
|
2939
CALL
Navitas Semiconductor
NVTS
$2.78B
| $944K | ﹤0.01% |
+55,500
| New | +$832K |
|
|
SGMO
2940
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $943K | ﹤0.01% |
125,800
+75,500
| +150% | +$656K |
|
|
LONA
2941
LeonaBio Inc
LONA
$69.1M
| $942K | ﹤0.01% |
7,237
+4,290
| +146% | +$542K |
|
2942
iShares Global Clean Energy ETF
ICLN
$2.35B
| $941K | ﹤0.01% |
44,459
-104,568
| -70% | -$2.41M |
|
2943
Urban Outfitters
URBN
$6.22B
| $941K | ﹤0.01% |
+32,079
| New | +$1.02M |
|
2944
Xeris Biopharma Holdings
XERS
$1.42B
| $941K | ﹤0.01% |
321,395
+308,466
| +2,386% | +$666K |
|
|
DCPH
2945
CALL
DELISTED
Deciphera Pharmaceuticals, Inc. Common Stock
DCPH
| $941K | ﹤0.01% |
96,400
+86,200
| +845% | +$1.62M |
|
2946
CALL
Crescent Energy
CRGY
$3.46B
| $939K | ﹤0.01% |
+74,100
| New | +$1.02M |
|
2947
Cerence
CRNC
$375M
| $939K | ﹤0.01% |
+12,263
| New | +$1.08M |
|
|
MAXR
2948
CALL
DELISTED
Maxar Technologies Inc. Common Stock
MAXR
| $939K | ﹤0.01% |
31,800
-61,100
| -66% | -$1.77M |
|
2949
CALL
West Pharmaceutical
WST
$23.3B
| $938K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$818K |
|
2950
CALL
Ambev
ABEV
$47.4B
| $936K | ﹤0.01% |
334,600
-57,500
| -15% | -$165K |
|
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.