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 | |
|---|---|---|---|---|---|---|
3176
CALL
GDS Holdings
GDS
$6.34B
| $838K | ﹤0.01% |
91,900
-6,600
| -7% | -$66.7K |
|
3177
Crinetics Pharmaceuticals
CRNX
$8.86B
| $837K | ﹤0.01% |
23,534
-86,842
| -79% | -$2.66M |
|
3178
NovoCure
NVCR
$2.04B
| $837K | ﹤0.01% |
+56,111
| New | +$751K |
|
3179
CALL
Jack Henry & Associates
JKHY
$10.7B
| $833K | ﹤0.01% |
5,100
-24,600
| -83% | -$3.77M |
|
3180
CALL
Central Garden & Pet Co Class A
CENTA
$2.41B
| $831K | ﹤0.01% |
+20,750
| New | +$665K |
|
3181
CALL
Carter's
CRI
$1.43B
| $831K | ﹤0.01% |
11,100
+9,000
| +429% | +$625K |
|
3182
PUT
Brookfield
BN
$102B
| $830K | ﹤0.01% |
36,150
+6,300
| +21% | +$143K |
|
3183
NCR Voyix
VYX
$1.06B
| $830K | ﹤0.01% |
49,103
-52,027
| -51% | -$830K |
|
3184
PUT
DHT Holdings
DHT
$2.97B
| $828K | ﹤0.01% |
84,500
-73,600
| -47% | -$757K |
|
3185
InMode
INMD
$872M
| $828K | ﹤0.01% |
+37,240
| New | +$836K |
|
|
SII
3186
PUT
Sprott
SII
$2.65B
| $828K | ﹤0.01% |
24,400
+3,700
| +18% | +$114K |
|
3187
CALL
Asure Software
ASUR
$220M
| $827K | ﹤0.01% |
86,900
+18,300
| +27% | +$153K |
|
3188
CALL
Companhia Siderúrgica Nacional
SID
$1.43B
| $827K | ﹤0.01% |
210,500
-5,000
| -2% | -$14.5K |
|
3189
Bilibili
BILI
$7.18B
| $826K | ﹤0.01% |
67,913
-28,399
| -29% | -$371K |
|
3190
Unilever
UL
$131B
| $826K | ﹤0.01% |
+15,153
| New | +$818K |
|
3191
PUT
LGI Homes
LGIH
$1.4B
| $825K | ﹤0.01% |
6,200
-10,100
| -62% | -$1.12M |
|
3192
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $824K | ﹤0.01% |
16,300
-25,500
| -61% | -$1.22M |
|
3193
CALL
Braze
BRZE
$2.45B
| $823K | ﹤0.01% |
15,500
+10,300
| +198% | +$509K |
|
3194
CALL
Sprinklr
CXM
$1.33B
| $821K | ﹤0.01% |
68,200
+44,000
| +182% | +$604K |
|
3195
PUT
Newell Brands
NWL
$2.16B
| $821K | ﹤0.01% |
94,700
-30,500
| -24% | -$233K |
|
3196
CALL
Opko Health
OPK
$921M
| $821K | ﹤0.01% |
543,800
-54,400
| -9% | -$78.6K |
|
|
SIX
3197
DELISTED
Six Flags Entertainment Corp.
SIX
| $820K | ﹤0.01% |
32,729
-12,431
| -28% | -$287K |
|
3198
PUT
Klaviyo
KVYO
$4.91B
| $819K | ﹤0.01% |
29,500
+20,500
| +228% | +$607K |
|
3199
CALL
abrdn Physical Silver Shares ETF
SIVR
$4.04B
| $819K | ﹤0.01% |
36,000
+22,800
| +173% | +$507K |
|
3200
CALL
Alliance Resource Partners
ARLP
$3.18B
| $817K | ﹤0.01% |
38,600
-47,200
| -55% | -$1.02M |
|
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.