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 | |
|---|---|---|---|---|---|---|
4376
CALL
Klaviyo
KVYO
$5.8B
| $263K | ﹤0.01% |
9,500
+3,700
| +64% | +$110K |
|
4377
Ocular Therapeutix
OCUL
$1.83B
| $263K | ﹤0.01% |
+59,115
| New | +$175K |
|
4378
CVR Partners
UAN
$1.3B
| $263K | ﹤0.01% |
4,026
+3,495
| +658% | +$261K |
|
4379
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $263K | ﹤0.01% |
4,518
+2,999
| +197% | +$173K |
|
4380
Ardmore Shipping
ASC
$683M
| $262K | ﹤0.01% |
18,664
-10,028
| -35% | -$135K |
|
|
OPTU
4381
Optimum Communications Inc
OPTU
$298M
| $262K | ﹤0.01% |
+80,846
| New | +$212K |
|
4382
PUT
Baytex Energy
BTE
$2.96B
| $262K | ﹤0.01% |
79,000
-8,100
| -9% | -$31.4K |
|
4383
ImmunityBio
IBRX
$7.15B
| $262K | ﹤0.01% |
52,314
+43,431
| +489% | +$136K |
|
4384
PUT
nCino
NCNO
$2.06B
| $262K | ﹤0.01% |
7,800
-6,400
| -45% | -$190K |
|
4385
iShares Mortgage Real Estate ETF
REM
$549M
| $262K | ﹤0.01% |
11,118
-37,164
| -77% | -$820K |
|
4386
Arbutus Biopharma
ABUS
$847M
| $261K | ﹤0.01% |
104,460
+79,069
| +311% | +$155K |
|
4387
CALL
Custom Truck One Source
CTOS
$2.21B
| $261K | ﹤0.01% |
42,300
+25,800
| +156% | +$152K |
|
|
HIVE
4388
HIVE Digital Technologies
HIVE
$679M
| $261K | ﹤0.01% |
+57,629
| New | +$197K |
|
4389
Olema Pharmaceuticals
OLMA
$977M
| $261K | ﹤0.01% |
+18,651
| New | +$251K |
|
4390
Algonquin Power & Utilities
AQN
$4.59B
| $259K | ﹤0.01% |
+41,127
| New | +$240K |
|
4391
B&G Foods
BGS
$303M
| $259K | ﹤0.01% |
+24,748
| New | +$229K |
|
4392
PUT
Bit Digital
BTBT
$428M
| $259K | ﹤0.01% |
61,400
+12,400
| +25% | +$32.4K |
|
4393
CALL
Daktronics
DAKT
$946M
| $259K | ﹤0.01% |
30,600
+14,400
| +89% | +$137K |
|
4394
Emergent Biosolutions
EBS
$379M
| $259K | ﹤0.01% |
108,076
+17,667
| +20% | +$41.5K |
|
4395
CALL
nVent Electric
NVT
$21.6B
| $259K | ﹤0.01% |
4,400
+3,300
| +300% | +$175K |
|
|
HTT
4396
CALL
High Templar Tech Ltd
HTT
$370M
| $259K | ﹤0.01% |
127,400
+102,400
| +410% | +$192K |
|
4397
CALL
Dolby
DLB
$4.97B
| $258K | ﹤0.01% |
3,000
+900
| +43% | +$75.9K |
|
4398
Ero Copper
ERO
$2.64B
| $258K | ﹤0.01% |
16,353
+15,756
| +2,639% | +$221K |
|
4399
CALL
LivaNova
LIVN
$4.47B
| $258K | ﹤0.01% |
5,000
-1,100
| -18% | -$53.2K |
|
4400
CALL
Stratasys
SSYS
$666M
| $258K | ﹤0.01% |
18,100
-5,700
| -24% | -$66.7K |
|
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.