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 | |
|---|---|---|---|---|---|---|
6476
Ingevity
NGVT
$2.49B
| $33K | ﹤0.01% |
699
-429
| -38% | -$17.8K |
|
6477
PUT
NextNav
NN
$1.76B
| $33K | ﹤0.01% |
+7,500
| New | +$33.9K |
|
|
NSA
6478
CALL
DELISTED
National Storage Affiliates Trust
NSA
| $33K | ﹤0.01% |
800
-700
| -47% | -$23.5K |
|
6479
CALL
Primoris Services
PRIM
$4.18B
| $33K | ﹤0.01% |
+1,000
| New | +$31.2K |
|
6480
PUT
Suburban Propane Partners
SPH
$1.23B
| $33K | ﹤0.01% |
1,900
+1,700
| +850% | +$29K |
|
6481
CALL
Taysha Gene Therapies
TSHA
$1.59B
| $33K | ﹤0.01% |
19,200
-400
| -2% | -$797 |
|
6482
Verrica Pharmaceuticals
VRCA
$92.9M
| $33K | ﹤0.01% |
452
-499
| -52% | -$20.5K |
|
6483
PUT
Beyond Air
XAIR
$3.92M
| $33K | ﹤0.01% |
43
+15
| +54% | +$11.7K |
|
|
CDMO
6484
CALL
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $33K | ﹤0.01% |
5,100
+2,800
| +122% | +$18K |
|
|
ME
6485
DELISTED
23andMe Holding Co
ME
| $33K | ﹤0.01% |
1,860
+1,848
| +15,400% | +$32K |
|
6486
PUT
Ceco Environmental
CECO
$3.55B
| $32K | ﹤0.01% |
1,600
+1,500
| +1,500% | +$27.3K |
|
6487
Capitol Federal Financial
CFFN
$1.08B
| $32K | ﹤0.01% |
+5,006
| New | +$26.9K |
|
6488
PUT
Carlyle Secured Lending
CGBD
$715M
| $32K | ﹤0.01% |
2,200
-28,400
| -93% | -$413K |
|
6489
PUT
Clene
CLNN
$61.7M
| $32K | ﹤0.01% |
5,425
-2,520
| -32% | -$22K |
|
|
CODX
6490
Co-Diagnostics
CODX
$5.71M
| $32K | ﹤0.01% |
+821
| New | +$28.9K |
|
6491
CALL
Future Fuel
FF
$204M
| $32K | ﹤0.01% |
5,300
-14,200
| -73% | -$90.6K |
|
|
FFWM
6492
CALL
DELISTED
First Foundation Inc
FFWM
| $32K | ﹤0.01% |
3,400
-1,900
| -36% | -$12.1K |
|
6493
H.B. Fuller
FUL
$2.99B
| $32K | ﹤0.01% |
399
-691
| -63% | -$51K |
|
|
GTY
6494
PUT
Getty Realty Corp
GTY
$2.16B
| $32K | ﹤0.01% |
1,100
+900
| +450% | +$25.5K |
|
|
HITI
6495
CALL
High Tide
HITI
$179M
| $32K | ﹤0.01% |
19,900
-97,500
| -83% | -$147K |
|
|
HSII
6496
CALL
DELISTED
Heidrick & Struggles
HSII
| $32K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$26.6K |
|
|
JFIN
6497
CALL
Jiayin Group
JFIN
$114M
| $32K | ﹤0.01% |
6,200
-8,900
| -59% | -$45.5K |
|
|
DFTX
6498
Definium Therapeutics
DFTX
$5.58B
| $32K | ﹤0.01% |
8,977
-758
| -8% | -$2.28K |
|
6499
PUT
Newegg Commerce
NEGG
$283M
| $32K | ﹤0.01% |
1,280
+415
| +48% | +$7.53K |
|
|
NEWP
6500
New Pacific Metals
NEWP
$820M
| $32K | ﹤0.01% |
17,167
-53,018
| -76% | -$91.6K |
|
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.