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 | |
|---|---|---|---|---|---|---|
4226
CALL
Tyra Biosciences
TYRA
$1.84B
| $300K | ﹤0.01% |
+21,700
| New | +$281K |
|
4227
PUT
Boot Barn
BOOT
$4.81B
| $299K | ﹤0.01% |
3,900
-27,300
| -88% | -$2.05M |
|
4228
Burlington
BURL
$23.3B
| $299K | ﹤0.01% |
+1,541
| New | +$230K |
|
4229
PUT
Metropolitan Bank Holding Corp
MCB
$1.14B
| $299K | ﹤0.01% |
5,400
-6,000
| -53% | -$237K |
|
4230
Frontier Group Holdings
ULCC
$1.43B
| $299K | ﹤0.01% |
54,851
-12,262
| -18% | -$53.6K |
|
4231
Merchants Bancorp
MBIN
$2.24B
| $298K | ﹤0.01% |
7,015
+6,871
| +4,772% | +$226K |
|
|
PRO
4232
PUT
DELISTED
PROS Holdings
PRO
| $298K | ﹤0.01% |
7,700
+6,900
| +863% | +$248K |
|
4233
PUT
RLX Technology
RLX
$2.43B
| $298K | ﹤0.01% |
149,300
-40,800
| -21% | -$75.9K |
|
4234
Eversource Energy
ES
$28.4B
| $297K | ﹤0.01% |
4,828
-19,317
| -80% | -$1.11M |
|
4235
CALL
Kodak
KODK
$812M
| $297K | ﹤0.01% |
76,300
-85,600
| -53% | -$329K |
|
4236
PUT
Ocular Therapeutix
OCUL
$1.85B
| $297K | ﹤0.01% |
66,700
+64,800
| +3,411% | +$192K |
|
|
TPH
4237
CALL
DELISTED
Tri Pointe Homes
TPH
| $297K | ﹤0.01% |
8,400
+7,300
| +664% | +$212K |
|
4238
PUT
United States Gasoline Fund
UGA
$142M
| $297K | ﹤0.01% |
4,900
-4,800
| -49% | -$300K |
|
4239
CALL
Woodside Energy
WDS
$42.1B
| $297K | ﹤0.01% |
14,100
+3,000
| +27% | +$63.9K |
|
4240
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$242M
| $297K | ﹤0.01% |
16,514
+16,176
| +4,786% | +$187K |
|
4241
CALL
Agios Pharmaceuticals
AGIO
$2.14B
| $296K | ﹤0.01% |
13,300
+9,500
| +250% | +$213K |
|
|
CUK
4242
CALL
DELISTED
Carnival PLC
CUK
| $296K | ﹤0.01% |
17,600
-20,400
| -54% | -$267K |
|
4243
CVRx
CVRX
$131M
| $296K | ﹤0.01% |
+9,435
| New | +$177K |
|
4244
CALL
Hubbell
HUBB
$25.6B
| $296K | ﹤0.01% |
900
-3,500
| -80% | -$1.05M |
|
4245
PUT
Intapp
INTA
$2.36B
| $296K | ﹤0.01% |
7,800
+2,000
| +34% | +$73.6K |
|
4246
Tempest Therapeutics
TPST
$13.9M
| $296K | ﹤0.01% |
+5,187
| New | +$246K |
|
4247
CALL
Banco Macro
BMA
$5.81B
| $295K | ﹤0.01% |
10,300
-7,700
| -43% | -$176K |
|
|
HOUS
4248
PUT
DELISTED
Anywhere Real Estate
HOUS
| $295K | ﹤0.01% |
36,400
+18,200
| +100% | +$103K |
|
4249
CALL
Hexcel
HXL
$8.3B
| $295K | ﹤0.01% |
4,000
+2,500
| +167% | +$169K |
|
4250
PUT
Microvision
MVIS
$86.6M
| $295K | ﹤0.01% |
111,100
-20,300
| -15% | -$46.6K |
|
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.