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 | |
|---|---|---|---|---|---|---|
6651
Kaiser Aluminum
KALU
$2.85B
| $76K | ﹤0.01% |
818
+387
| +90% | +$39.2K |
|
6652
PUT
KBR
KBR
$4.76B
| $76K | ﹤0.01% |
1,600
+1,200
| +300% | +$53K |
|
6653
PLAYSTUDIOS Inc
MYPS
$88M
| $76K | ﹤0.01% |
+19,462
| New | +$84.5K |
|
6654
CALL
National CineMedia
NCMI
$388M
| $76K | ﹤0.01% |
2,710
-1,010
| -27% | -$32.1K |
|
6655
CALL
Envista
NVST
$4.53B
| $76K | ﹤0.01% |
1,700
-23,800
| -93% | -$979K |
|
6656
CALL
Radian Group
RDN
$5.26B
| $76K | ﹤0.01% |
3,600
-11,000
| -75% | -$244K |
|
|
RENT
6657
Rent the Runway
RENT
$120M
| $76K | ﹤0.01% |
+470
| New | +$125K |
|
6658
CALL
Reinsurance Group of America
RGA
$15.5B
| $76K | ﹤0.01% |
700
-4,700
| -87% | -$522K |
|
6659
CALL
Smith Micro Software
SMSI
$15.8M
| $76K | ﹤0.01% |
388
+110
| +40% | +$24K |
|
6660
Spok Holdings
SPOK
$232M
| $76K | ﹤0.01% |
8,208
+7,807
| +1,947% | +$76.6K |
|
|
VBIV
6661
PUT
DELISTED
VBI Vaccines, Inc. New Common Stock (Canada)
VBIV
| $76K | ﹤0.01% |
1,090
-1,053
| -49% | -$88.7K |
|
|
PGTI
6662
CALL
DELISTED
PGT, Inc.
PGTI
| $76K | ﹤0.01% |
3,400
+2,600
| +325% | +$55.6K |
|
|
NM
6663
PUT
DELISTED
Navios Maritime Holdings Inc.
NM
| $76K | ﹤0.01% |
20,800
+2,600
| +14% | +$12.8K |
|
|
HTGCR
6664
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $76K | ﹤0.01% |
4,600
-11,500
| -71% | -$190K |
|
|
DRD
6665
PUT
DRDGold
DRD
$1.89B
| $75K | ﹤0.01% |
8,900
+3,200
| +56% | +$28.5K |
|
6666
PUT
Flux Power
FLUX
$12.4M
| $75K | ﹤0.01% |
17,600
+16,000
| +1,000% | +$85K |
|
6667
CALL
Health Catalyst
HCAT
$166M
| $75K | ﹤0.01% |
1,900
-2,100
| -53% | -$95.7K |
|
|
HEES
6668
CALL
DELISTED
H&E Equipment Services
HEES
| $75K | ﹤0.01% |
1,700
-3,100
| -65% | -$135K |
|
|
JHG
6669
PUT
DELISTED
Janus Henderson
JHG
| $75K | ﹤0.01% |
+1,800
| New | +$79.5K |
|
|
6670
PUT
Kaiser Aluminum
KALU
$2.85B
| $75K | ﹤0.01% |
+800
| New | +$81K |
|
6671
MiMedx Group
MDXG
$612M
| $75K | ﹤0.01% |
12,567
-414
| -3% | -$2.88K |
|
6672
Mueller Water Products
MWA
$4.14B
| $75K | ﹤0.01% |
5,214
-166
| -3% | -$2.5K |
|
6673
Onto Innovation
ONTO
$14.4B
| $75K | ﹤0.01% |
748
-1,108
| -60% | -$95.6K |
|
6674
CALL
Red Cat Holdings
RCAT
$1.36B
| $75K | ﹤0.01% |
+36,200
| New | +$90.3K |
|
|
RDNW
6675
RideNow Group
RDNW
$264M
| $75K | ﹤0.01% |
+1,830
| New | +$72.9K |
|
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.