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 | |
|---|---|---|---|---|---|---|
7751
Beam Therapeutics
BEAM
$2.63B
| $33K | ﹤0.01% |
+415
| New | +$35.5K |
|
7752
PUT
Blend Labs
BLND
$431M
| $33K | ﹤0.01% |
+4,500
| New | +$52.2K |
|
7753
PUT
Brixmor Property Group
BRX
$9.67B
| $33K | ﹤0.01% |
1,300
-2,900
| -69% | -$69.6K |
|
7754
BuzzFeed
BZFD
$99M
| $33K | ﹤0.01% |
+1,559
| New | +$55K |
|
7755
CALL
Capricor Therapeutics
CAPR
$223M
| $33K | ﹤0.01% |
11,400
-7,400
| -39% | -$25.9K |
|
|
CARM
7756
DELISTED
Carisma Therapeutics
CARM
| $33K | ﹤0.01% |
2,037
-4,709
| -70% | -$94.8K |
|
7757
CALL
Clearfield
CLFD
$411M
| $33K | ﹤0.01% |
400
-20,400
| -98% | -$1.28M |
|
7758
PUT
Compass Diversified
CODI
$758M
| $33K | ﹤0.01% |
1,100
-1,400
| -56% | -$42.4K |
|
7759
Pacer US Cash Cows 100 ETF
COWZ
$18.8B
| $33K | ﹤0.01% |
704
+677
| +2,507% | +$31.1K |
|
7760
DLH Holdings
DLHC
$70.7M
| $33K | ﹤0.01% |
1,602
+1,496
| +1,411% | +$22.6K |
|
|
EARN
7761
CALL
Ellington Residential Mortgage REIT
EARN
$162M
| $33K | ﹤0.01% |
+3,200
| New | +$36.6K |
|
7762
PUT
Fortis
FTS
$29B
| $33K | ﹤0.01% |
700
+100
| +17% | +$4.53K |
|
7763
German American Bancorp
GABC
$1.91B
| $33K | ﹤0.01% |
+853
| New | +$34.1K |
|
|
GBIO
7764
DELISTED
Generation Bio
GBIO
| $33K | ﹤0.01% |
467
-1,836
| -80% | -$321K |
|
|
GMS
7765
DELISTED
GMS Inc
GMS
| $33K | ﹤0.01% |
+557
| New | +$30.1K |
|
7766
CALL
Healthcare Services Group
HCSG
$1.6B
| $33K | ﹤0.01% |
1,900
+1,100
| +138% | +$21.4K |
|
7767
CALL
Mercury Systems
MRCY
$5.83B
| $33K | ﹤0.01% |
600
-10,400
| -95% | -$527K |
|
7768
Middlesex Water
MSEX
$1.08B
| $33K | ﹤0.01% |
275
-1,149
| -81% | -$122K |
|
|
NOAH
7769
PUT
Noah Holdings
NOAH
$580M
| $33K | ﹤0.01% |
+1,100
| New | +$41.4K |
|
7770
PUT
Primoris Services
PRIM
$4.58B
| $33K | ﹤0.01% |
1,400
-15,700
| -92% | -$397K |
|
7771
Prospect Capital
PSEC
$1.07B
| $33K | ﹤0.01% |
+3,944
| New | +$33.2K |
|
|
HTT
7772
PUT
High Templar Tech Ltd
HTT
$379M
| $33K | ﹤0.01% |
34,300
-123,300
| -78% | -$179K |
|
7773
PUT
Quantum-Si Incorporated
QSI
$155M
| $33K | ﹤0.01% |
4,200
-118,800
| -97% | -$895K |
|
7774
Rhythm Pharmaceuticals
RYTM
$6.81B
| $33K | ﹤0.01% |
3,348
-1,056
| -24% | -$11.9K |
|
7775
PUT
Saia
SAIA
$9.27B
| $33K | ﹤0.01% |
+100
| New | +$31K |
|
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.