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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6551
Annexon
ANNX
$788M
| $30K | ﹤0.01% |
6,753
+5,801
| +609% | +$14.4K |
|
6552
PUT
Compañía de Cervecerías Unidas
CCU
$2.17B
| $30K | ﹤0.01% |
+2,400
| New | +$29K |
|
6553
CALL
Douglas Emmett
DEI
$2.1B
| $30K | ﹤0.01% |
2,100
+100
| +5% | +$1.27K |
|
6554
iShares Core Universal USD Bond ETF
IUSB
$43B
| $30K | ﹤0.01% |
+660
| New | +$29.2K |
|
|
TBHC
6555
CALL
DELISTED
The Brand House Collective
TBHC
| $30K | ﹤0.01% |
10,100
+3,200
| +46% | +$7K |
|
6556
CALL
Oramed Pharmaceuticals
ORMP
$168M
| $30K | ﹤0.01% |
13,000
+800
| +7% | +$1.71K |
|
|
QIPT
6557
PUT
DELISTED
Quipt Home Medical
QIPT
| $30K | ﹤0.01% |
5,900
-1,000
| -14% | -$4.79K |
|
6558
Rani Therapeutics
RANI
$91.7M
| $30K | ﹤0.01% |
9,136
+7,893
| +635% | +$18.3K |
|
|
BNKK
6559
PUT
Bonk Inc
BNKK
$8.4M
| $30K | ﹤0.01% |
+251
| New | +$23.6K |
|
6560
CALL
Viridian Therapeutics
VRDN
$2.13B
| $30K | ﹤0.01% |
1,400
+400
| +40% | +$6.31K |
|
|
WSR
6561
DELISTED
Whitestone REIT
WSR
| $30K | ﹤0.01% |
+2,449
| New | +$26.2K |
|
|
IRD
6562
Opus Genetics
IRD
$274M
| $30K | ﹤0.01% |
10,029
+2,424
| +32% | +$7.17K |
|
|
ROIC
6563
PUT
DELISTED
Retail Opportunity Investments Corp.
ROIC
| $30K | ﹤0.01% |
+2,200
| New | +$27.7K |
|
|
GOEV
6564
PUT
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $30K | ﹤0.01% |
260
-56
| -18% | -$7.58K |
|
6565
PUT
Aegon
AEG
$13.4B
| $29K | ﹤0.01% |
5,200
-13,200
| -72% | -$68.6K |
|
6566
PUT
Sphere 3D
ANY
$16.4M
| $29K | ﹤0.01% |
890
+490
| +123% | +$6.67K |
|
6567
CALL
Arcutis Biotherapeutics
ARQT
$3.49B
| $29K | ﹤0.01% |
9,200
+3,500
| +61% | +$9.51K |
|
6568
CALL
Associated Banc-Corp
ASB
$5.82B
| $29K | ﹤0.01% |
1,400
+1,200
| +600% | +$21.6K |
|
6569
Bally's
BALY
$717M
| $29K | ﹤0.01% |
2,105
+1,650
| +363% | +$18.5K |
|
6570
BioAtla
BCAB
$5.61M
| $29K | ﹤0.01% |
239
-511
| -68% | -$44.3K |
|
|
BCTX
6571
CALL
Briacell Therapeutics
BCTX
$29.6M
| $29K | ﹤0.01% |
121
+20
| +20% | +$14.3K |
|
6572
Barnes & Noble Education
BNED
$442M
| $29K | ﹤0.01% |
200
-1,035
| -84% | -$115K |
|
6573
Cognyte Software
CGNT
$662M
| $29K | ﹤0.01% |
4,592
-5,974
| -57% | -$29.9K |
|
6574
CALL
Central Pacific Financial
CPF
$1.02B
| $29K | ﹤0.01% |
1,500
-4,000
| -73% | -$70K |
|
6575
PUT
Carter's
CRI
$1.4B
| $29K | ﹤0.01% |
400
-5,100
| -93% | -$354K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.