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 | |
|---|---|---|---|---|---|---|
3726
Sundial Growers
SNDL
$325M
| $490K | ﹤0.01% |
298,877
+139,256
| +87% | +$210K |
|
|
VLRS
3727
Controladora Vuela Compania de Aviacion
VLRS
$906M
| $490K | ﹤0.01% |
52,258
+44,420
| +567% | +$324K |
|
3728
CALL
Grand Canyon Education
LOPE
$3.96B
| $488K | ﹤0.01% |
3,700
+3,500
| +1,750% | +$455K |
|
3729
PUT
SandRidge Energy
SD
$498M
| $488K | ﹤0.01% |
35,700
-31,000
| -46% | -$458K |
|
3730
GigaCloud Technology
GCT
$1.47B
| $487K | ﹤0.01% |
+26,667
| New | +$294K |
|
|
TBCH
3731
CALL
Turtle Beach Corp
TBCH
$244M
| $487K | ﹤0.01% |
44,500
+6,200
| +16% | +$60.8K |
|
3732
PUT
Brookfield Renewable
BEP
$9.57B
| $486K | ﹤0.01% |
18,500
+9,600
| +108% | +$227K |
|
3733
Mercer International
MERC
$45.2M
| $486K | ﹤0.01% |
51,326
-51,396
| -50% | -$461K |
|
3734
-1x Short VIX Futures ETF
SVIX
$168M
| $486K | ﹤0.01% |
12,887
-7,383
| -36% | -$228K |
|
3735
PIMCO 15+ Year US TIPS Index Exchange-Traded Fund
LTPZ
$696M
| $485K | ﹤0.01% |
+8,558
| New | +$455K |
|
3736
CALL
Remitly
RELY
$4.74B
| $485K | ﹤0.01% |
25,000
+6,300
| +34% | +$141K |
|
3737
PUT
Autoliv
ALV
$8.98B
| $484K | ﹤0.01% |
4,400
-25,500
| -85% | -$2.54M |
|
3738
PUT
CVR Partners
UAN
$1.28B
| $484K | ﹤0.01% |
7,400
-4,200
| -36% | -$314K |
|
3739
CALL
Dorman Products
DORM
$4.21B
| $483K | ﹤0.01% |
5,800
+1,600
| +38% | +$120K |
|
3740
CALL
Medifast
MED
$109M
| $483K | ﹤0.01% |
7,200
+3,800
| +112% | +$265K |
|
3741
Ionis Pharmaceuticals
IONS
$9.11B
| $482K | ﹤0.01% |
+9,545
| New | +$457K |
|
3742
CALL
Kanzhun
BZ
$7.06B
| $481K | ﹤0.01% |
29,000
-27,400
| -49% | -$430K |
|
3743
Community Health Systems
CYH
$393M
| $481K | ﹤0.01% |
153,831
+150,854
| +5,067% | +$407K |
|
3744
PUT
Imperial Petroleum
IMPP
$214M
| $481K | ﹤0.01% |
183,800
+169,100
| +1,150% | +$311K |
|
3745
Navitas Semiconductor
NVTS
$2.35B
| $481K | ﹤0.01% |
59,627
-13,916
| -19% | -$93.3K |
|
3746
Penske Automotive Group
PAG
$14.3B
| $481K | ﹤0.01% |
+3,001
| New | +$460K |
|
3747
PUT
PubMatic
PUBM
$605M
| $481K | ﹤0.01% |
29,500
+4,000
| +16% | +$58K |
|
3748
PUT
Veracyte
VCYT
$4.43B
| $481K | ﹤0.01% |
17,500
+12,400
| +243% | +$299K |
|
|
TUP
3749
PUT
DELISTED
Tupperware Brands Corporation
TUP
| $481K | ﹤0.01% |
240,500
-167,000
| -41% | -$302K |
|
3750
CALL
Timken Company
TKR
$9.75B
| $480K | ﹤0.01% |
6,000
+5,200
| +650% | +$383K |
|
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.