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 | |
|---|---|---|---|---|---|---|
6751
PUT
Global Net Lease
GNL
$1.83B
| $71K | ﹤0.01% |
4,700
-3,700
| -44% | -$57.5K |
|
|
BRSL
6752
Brightstar Lottery PLC
BRSL
$1.86B
| $71K | ﹤0.01% |
+2,484
| New | +$70.3K |
|
6753
PUT
Korea Electric Power
KEP
$15.5B
| $71K | ﹤0.01% |
+7,800
| New | +$73.7K |
|
6754
PUT
Landstar System
LSTR
$6B
| $71K | ﹤0.01% |
400
+100
| +33% | +$17.1K |
|
6755
PUT
Northern Trust
NTRS
$33.3B
| $71K | ﹤0.01% |
600
-25,300
| -98% | -$3.03M |
|
6756
CALL
Oxford Industries
OXM
$568M
| $71K | ﹤0.01% |
700
-4,700
| -87% | -$457K |
|
6757
PUT
FreightCar America
RAIL
$270M
| $71K | ﹤0.01% |
19,500
-22,300
| -53% | -$93.4K |
|
6758
PUT
UNIFI
UFI
$119M
| $71K | ﹤0.01% |
+3,100
| New | +$70.7K |
|
6759
CALL
Xometry
XMTR
$4.81B
| $71K | ﹤0.01% |
+1,400
| New | +$72K |
|
|
AAMI
6760
CALL
Acadian Asset Management
AAMI
$3.2B
| $71K | ﹤0.01% |
2,800
-3,700
| -57% | -$104K |
|
|
ACCD
6761
PUT
DELISTED
Accolade Inc
ACCD
| $71K | ﹤0.01% |
2,700
-13,900
| -84% | -$455K |
|
|
SHPW
6762
PUT
DELISTED
Shapeways Holdings, Inc. Common Stock
SHPW
| $71K | ﹤0.01% |
+2,425
| New | +$114K |
|
|
RMO
6763
PUT
DELISTED
Romeo Power, Inc.
RMO
| $71K | ﹤0.01% |
19,500
-18,900
| -49% | -$81.5K |
|
|
AVAN
6764
CALL
DELISTED
Avanti Acquisition Corp.
AVAN
| $71K | ﹤0.01% |
+7,300
| New | +$71.7K |
|
|
TREC
6765
CALL
DELISTED
Trecora Resources
TREC
| $71K | ﹤0.01% |
+8,800
| New | +$72.5K |
|
6766
CALL
AC Immune
ACIU
$226M
| $70K | ﹤0.01% |
14,300
+12,400
| +653% | +$72.1K |
|
6767
PUT
Assured Guaranty
AGO
$3.72B
| $70K | ﹤0.01% |
1,400
-21,000
| -94% | -$1.08M |
|
|
FRMM
6768
PUT
Forum Markets
FRMM
$69.4M
| $70K | ﹤0.01% |
5
-1
| -17% | -$17.8K |
|
6769
CALL
American Vanguard Corp
AVD
$70.4M
| $70K | ﹤0.01% |
+4,300
| New | +$67.4K |
|
|
BQ
6770
CALL
Boqii Holding Ltd
BQ
$5.9M
| $70K | ﹤0.01% |
402
+385
| +2,265% | +$131K |
|
6771
CALL
Citius Pharmaceuticals
CTXR
$16.4M
| $70K | ﹤0.01% |
1,840
+1,804
| +5,011% | +$81.8K |
|
6772
Extreme Networks
EXTR
$3.92B
| $70K | ﹤0.01% |
4,466
-19,856
| -82% | -$243K |
|
6773
National Vision
EYE
$1.8B
| $70K | ﹤0.01% |
1,463
+1,448
| +9,653% | +$77.6K |
|
|
MFA
6774
MFA Financial
MFA
$931M
| $70K | ﹤0.01% |
3,866
+3,853
| +29,638% | +$70.2K |
|
|
MRUS
6775
DELISTED
Merus
MRUS
| $70K | ﹤0.01% |
+2,215
| New | +$62.6K |
|
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.