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 | |
|---|---|---|---|---|---|---|
6551
PUT
Adaptive Biotechnologies
ADPT
$3.9B
| $81K | ﹤0.01% |
2,900
+1,800
| +164% | +$55.2K |
|
6552
CALL
Altimmune
ALT
$597M
| $81K | ﹤0.01% |
8,900
-25,000
| -74% | -$266K |
|
6553
CALL
Consensus Cloud Solutions
CCSI
$708M
| $81K | ﹤0.01% |
+1,400
| New | +$85.2K |
|
6554
CALL
CareDx
CDNA
$2.44B
| $81K | ﹤0.01% |
1,800
-4,100
| -69% | -$214K |
|
6555
PUT
CDW
CDW
$19.7B
| $81K | ﹤0.01% |
400
-900
| -69% | -$171K |
|
6556
Codexis
CDXS
$154M
| $81K | ﹤0.01% |
2,618
+676
| +35% | +$22.2K |
|
6557
Euronet Worldwide
EEFT
$2.93B
| $81K | ﹤0.01% |
681
+436
| +178% | +$51.8K |
|
6558
PUT
Hillman Solutions
HLMN
$1.87B
| $81K | ﹤0.01% |
+7,600
| New | +$81.8K |
|
6559
CALL
Samsara
IOT
$22.5B
| $81K | ﹤0.01% |
+2,900
| New | +$75.5K |
|
6560
State Street SPDR S&P 400 Mid Cap Growth ETF
MDYG
$2.91B
| $81K | ﹤0.01% |
+1,000
| New | +$80.2K |
|
6561
CALL
Nurix Therapeutics
NRIX
$2.56B
| $81K | ﹤0.01% |
+2,800
| New | +$84.9K |
|
6562
CALL
Rexford Industrial Realty
REXR
$8.25B
| $81K | ﹤0.01% |
+1,000
| New | +$69.3K |
|
6563
PUT
Ryanair
RYAAY
$31.2B
| $81K | ﹤0.01% |
2,000
+1,250
| +167% | +$54.4K |
|
6564
Sonic Automotive
SAH
$2.79B
| $81K | ﹤0.01% |
+1,650
| New | +$82.7K |
|
6565
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.38B
| $81K | ﹤0.01% |
1,500
-1,200
| -44% | -$61.5K |
|
6566
PUT
SS&C Technologies
SSNC
$19B
| $81K | ﹤0.01% |
1,000
-1,400
| -58% | -$108K |
|
|
STR
6567
CALL
DELISTED
Sitio Royalties
STR
| $81K | ﹤0.01% |
4,200
+2,000
| +91% | +$42.6K |
|
|
XNET
6568
PUT
Xunlei
XNET
$341M
| $81K | ﹤0.01% |
40,500
+18,400
| +83% | +$48.2K |
|
|
CURO
6569
CALL
DELISTED
CURO Group Holdings Corp.
CURO
| $81K | ﹤0.01% |
5,100
-6,800
| -57% | -$118K |
|
|
PTRA
6570
DELISTED
Proterra Inc. Common Stock
PTRA
| $81K | ﹤0.01% |
9,266
+6,370
| +220% | +$65.2K |
|
|
DSPG
6571
CALL
DELISTED
DSP Group Inc
DSPG
| $81K | ﹤0.01% |
+6,800
| New | +$149K |
|
|
DMC
6572
PUT
Del Monte Corp
DMC
$1.41B
| $80K | ﹤0.01% |
2,900
+900
| +45% | +$26.5K |
|
6573
Hain Celestial
HAIN
$48.7M
| $80K | ﹤0.01% |
1,880
-20,750
| -92% | -$885K |
|
6574
PUT
Liberty Broadband Class C
LBRDK
$5.17B
| $80K | ﹤0.01% |
500
+100
| +25% | +$16.5K |
|
6575
CALL
Myriad Genetics
MYGN
$303M
| $80K | ﹤0.01% |
2,900
+200
| +7% | +$5.79K |
|
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.