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 | |
|---|---|---|---|---|---|---|
5401
CALL
Pilgrim's Pride
PPC
$6.51B
| $99K | ﹤0.01% |
3,600
+1,200
| +50% | +$30.5K |
|
5402
UroGen Pharma
URGN
$1.86B
| $99K | ﹤0.01% |
6,651
+3,501
| +111% | +$45.4K |
|
|
VTYX
5403
PUT
DELISTED
Ventyx Biosciences
VTYX
| $99K | ﹤0.01% |
40,400
+38,500
| +2,026% | +$366K |
|
|
YALA
5404
Yalla Group
YALA
$818M
| $99K | ﹤0.01% |
16,186
+10,284
| +174% | +$58.3K |
|
|
TWKS
5405
DELISTED
Thoughtworks Holding, Inc. Common Stock
TWKS
| $99K | ﹤0.01% |
20,641
+5,993
| +41% | +$24.6K |
|
|
AAN
5406
DELISTED
The Aaron's Company Inc
AAN
| $99K | ﹤0.01% |
+9,175
| New | +$85.2K |
|
|
SLCA
5407
CALL
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $99K | ﹤0.01% |
8,800
-1,900
| -18% | -$22.5K |
|
5408
Cinemark Holdings
CNK
$4.24B
| $98K | ﹤0.01% |
+6,990
| New | +$109K |
|
5409
CALL
Domo
DOMO
$174M
| $98K | ﹤0.01% |
9,600
-3,400
| -26% | -$31.4K |
|
5410
CALL
Renaissance International IPO ETF
IPOS
$11.2M
| $98K | ﹤0.01% |
2,600
+500
| +24% | +$6.77K |
|
5411
PUT
Kosmos Energy
KOS
$1.6B
| $98K | ﹤0.01% |
14,700
-17,400
| -54% | -$122K |
|
|
CYPH
5412
Cypherpunk Technologies Inc
CYPH
$62.9M
| $98K | ﹤0.01% |
23,844
+18,918
| +384% | +$40.9K |
|
5413
PUT
Lightbridge
LTBR
$271M
| $98K | ﹤0.01% |
30,700
+13,500
| +78% | +$53.7K |
|
5414
Lufax Holding
LU
$1.35B
| $98K | ﹤0.01% |
32,134
-17,227
| -35% | -$64.2K |
|
5415
CALL
Outdoor Holding Co
POWW
$249M
| $98K | ﹤0.01% |
47,100
+36,500
| +344% | +$83.1K |
|
5416
PUT
TaskUs
TASK
$556M
| $98K | ﹤0.01% |
7,500
-2,100
| -22% | -$23.3K |
|
5417
Tidewater
TDW
$3.73B
| $98K | ﹤0.01% |
1,371
-4,107
| -75% | -$266K |
|
|
TPIC
5418
PUT
DELISTED
TPI Composites
TPIC
| $98K | ﹤0.01% |
+23,700
| New | +$61.7K |
|
5419
Vitesse Energy
VTS
$651M
| $98K | ﹤0.01% |
4,513
+4,170
| +1,216% | +$96.2K |
|
5420
CALL
Arrow Electronics
ARW
$11.1B
| $97K | ﹤0.01% |
800
+700
| +700% | +$83.5K |
|
5421
PUT
BGC Group
BGC
$5.45B
| $97K | ﹤0.01% |
13,500
-300
| -2% | -$1.86K |
|
|
CMPS
5422
Compass Pathways
CMPS
$1.53B
| $97K | ﹤0.01% |
11,122
+10,606
| +2,055% | +$68.6K |
|
5423
CALL
Lloyds Banking Group
LYG
$89.5B
| $97K | ﹤0.01% |
40,900
-1,600
| -4% | -$3.43K |
|
5424
CALL
Summit Therapeutics
SMMT
$10.4B
| $97K | ﹤0.01% |
37,200
-22,800
| -38% | -$46.9K |
|
5425
CALL
Stock Yards Bancorp
SYBT
$2.64B
| $97K | ﹤0.01% |
+1,900
| New | +$84.5K |
|
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.