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 | |
|---|---|---|---|---|---|---|
8326
CALL
Riskified
RSKD
$672M
| $2K | ﹤0.01% |
500
+100
| +25% | +$409 |
|
8327
CALL
Rentokil
RTO
$14.3B
| $2K | ﹤0.01% |
100
-100
| -50% | -$2.94K |
|
|
SACH
8328
Sachem Capital Corp
SACH
$38.4M
| $2K | ﹤0.01% |
+590
| New | +$2.11K |
|
8329
PUT
Stellus Capital Investment Corp
SCM
$203M
| $2K | ﹤0.01% |
200
-400
| -67% | -$5.17K |
|
8330
PUT
Sight Sciences
SGHT
$267M
| $2K | ﹤0.01% |
+500
| New | +$1.54K |
|
8331
PUT
SI-BONE Inc
SIBN
$737M
| $2K | ﹤0.01% |
100
-1,900
| -95% | -$35.2K |
|
8332
SITE Centers
SITC
$230M
| $2K | ﹤0.01% |
233
+57
| +32% | +$568 |
|
|
8333
PUT
SITE Centers
SITC
$230M
| $2K | ﹤0.01% |
256
-513
| -67% | -$5.11K |
|
|
HTO
8334
CALL
H2O America
HTO
$2.67B
| $2K | ﹤0.01% |
+19,300
| New | +$1.22M |
|
8335
CALL
Solid Power
SLDP
$468M
| $2K | ﹤0.01% |
2,000
+1,000
| +100% | +$1.5K |
|
8336
PUT
SelectQuote
SLQT
$114M
| $2K | ﹤0.01% |
1,900
+100
| +6% | +$130 |
|
8337
Sumitomo Mitsui Financial
SMFG
$166B
| $2K | ﹤0.01% |
295
-302
| -51% | -$2.93K |
|
|
8338
PUT
Sumitomo Mitsui Financial
SMFG
$166B
| $2K | ﹤0.01% |
+300
| New | +$2.91K |
|
8339
SEACOR Marine Holdings
SMHI
$216M
| $2K | ﹤0.01% |
+228
| New | +$2.92K |
|
8340
Similarweb
SMWB
$551M
| $2K | ﹤0.01% |
440
+89
| +25% | +$466 |
|
|
SOGP
8341
Sound Group
SOGP
$45.9M
| $2K | ﹤0.01% |
965
-363
| -27% | -$1.22K |
|
8342
CALL
South Plains Financial
SPFI
$841M
| $2K | ﹤0.01% |
100
| – | – |
|
|
SPNS
8343
CALL
DELISTED
Sapiens International
SPNS
| $2K | ﹤0.01% |
+100
| New | +$2.66K |
|
8344
CALL
SiriusPoint
SPNT
$2.98B
| $2K | ﹤0.01% |
+200
| New | +$2.11K |
|
8345
CALL
Savara
SVRA
$1.13B
| $2K | ﹤0.01% |
500
-1,400
| -74% | -$5.37K |
|
8346
PUT
Talkspace
TALK
$873M
| $2K | ﹤0.01% |
+800
| New | +$1.62K |
|
8347
CALL
Alaunos Therapeutics
TCRT
$4.74M
| $2K | ﹤0.01% |
1,692
-23
| -1% | -$277 |
|
8348
TH International
THCH
$52.9M
| $2K | ﹤0.01% |
261
-9,504
| -97% | -$83.5K |
|
8349
Millicom
TIGO
$15.8B
| $2K | ﹤0.01% |
134
-367
| -73% | -$5.99K |
|
8350
CALL
Turning Point Brands
TPB
$1.47B
| $2K | ﹤0.01% |
100
-2,300
| -96% | -$52.6K |
|
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.