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 | |
|---|---|---|---|---|---|---|
4276
Amplify Alternative Harvest ETF
MJ
$96.5M
| $286K | ﹤0.01% |
7,385
+2,568
| +53% | +$96.6K |
|
4277
RadNet
RDNT
$4.91B
| $286K | ﹤0.01% |
+8,238
| New | +$260K |
|
4278
Ascendis Pharma A/S
ASND
$16.7B
| $285K | ﹤0.01% |
+2,270
| New | +$226K |
|
4279
CALL
Carlyle Secured Lending
CGBD
$717M
| $285K | ﹤0.01% |
19,100
+8,600
| +82% | +$125K |
|
4280
State Street SPDR S&P Insurance ETF
KIE
$669M
| $285K | ﹤0.01% |
+6,306
| New | +$277K |
|
4281
CALL
Prudential
PUK
$36.5B
| $285K | ﹤0.01% |
+12,700
| New | +$278K |
|
|
SHCO
4282
DELISTED
Soho House & Co
SHCO
| $285K | ﹤0.01% |
40,165
+28,536
| +245% | +$201K |
|
|
TUZ
4283
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $285K | ﹤0.01% |
4,700
-9,000
| -66% | -$546K |
|
4284
CALL
Protolabs
PRLB
$1.72B
| $284K | ﹤0.01% |
7,300
+5,800
| +387% | +$188K |
|
4285
CALL
Anterix
ATEX
$1.72B
| $283K | ﹤0.01% |
8,500
+5,400
| +174% | +$174K |
|
4286
PUT
FingerMotion
FNGR
$15.7M
| $283K | ﹤0.01% |
70,600
+9,000
| +15% | +$44.5K |
|
4287
CALL
Fox Factory Holding Corp
FOXF
$789M
| $283K | ﹤0.01% |
4,200
-1,100
| -21% | -$80.3K |
|
4288
Haleon
HLN
$45.1B
| $283K | ﹤0.01% |
34,457
-45,915
| -57% | -$378K |
|
|
SAGE
4289
PUT
DELISTED
Sage Therapeutics
SAGE
| $283K | ﹤0.01% |
13,100
-49,400
| -79% | -$979K |
|
4290
PUT
Avnet
AVT
$6.92B
| $282K | ﹤0.01% |
5,600
+4,900
| +700% | +$233K |
|
|
BRDG
4291
DELISTED
Bridge Investment Group
BRDG
| $282K | ﹤0.01% |
+28,935
| New | +$235K |
|
4292
Casey's General Stores
CASY
$32.5B
| $282K | ﹤0.01% |
1,028
-323
| -24% | -$88.3K |
|
4293
PUT
Dime Commercial Bancshares
DCOM
$1.79B
| $282K | ﹤0.01% |
10,500
+9,200
| +708% | +$197K |
|
|
KC
4294
CALL
Kingsoft Cloud Holdings
KC
$2.98B
| $281K | ﹤0.01% |
74,500
-100
| -0.1% | -$457 |
|
4295
CALL
Rush Enterprises Class A
RUSHA
$6.37B
| $281K | ﹤0.01% |
+5,600
| New | +$226K |
|
4296
CALL
Vir Biotechnology
VIR
$1.45B
| $281K | ﹤0.01% |
28,000
+14,600
| +109% | +$133K |
|
4297
Cheesecake Factory
CAKE
$4.91B
| $280K | ﹤0.01% |
7,998
-46,706
| -85% | -$1.49M |
|
4298
PUT
Flowserve
FLS
$8.91B
| $280K | ﹤0.01% |
6,800
+2,400
| +55% | +$92.2K |
|
4299
PUT
1-800-Flowers.com
FLWS
$256M
| $280K | ﹤0.01% |
26,000
-31,900
| -55% | -$273K |
|
4300
GeoPark
GPRK
$609M
| $280K | ﹤0.01% |
32,694
+31,592
| +2,867% | +$299K |
|
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.