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 | |
|---|---|---|---|---|---|---|
|
UMH
5151
PUT
UMH Properties
UMH
$1.29B
| $125K | ﹤0.01% |
8,200
+8,100
| +8,100% | +$117K |
|
5152
PUT
NCR Voyix
VYX
$1.14B
| $125K | ﹤0.01% |
69,600
-43,522
| -38% | -$694K |
|
5153
Comtech Telecommunications
CMTL
$50.3M
| $124K | ﹤0.01% |
14,757
+14,315
| +3,239% | +$149K |
|
5154
Gaotu Techedu
GOTU
$434M
| $124K | ﹤0.01% |
34,318
+29,901
| +677% | +$84.1K |
|
5155
PDS Biotechnology
PDSB
$38.4M
| $124K | ﹤0.01% |
25,083
-16,456
| -40% | -$81.8K |
|
5156
PUT
Protolabs
PRLB
$1.79B
| $124K | ﹤0.01% |
3,200
+1,800
| +129% | +$58.3K |
|
5157
PUT
Surgery Partners
SGRY
$2.01B
| $124K | ﹤0.01% |
3,900
-2,300
| -37% | -$66.7K |
|
5158
PUT
Supernus Pharmaceuticals
SUPN
$2.59B
| $124K | ﹤0.01% |
+4,300
| New | +$114K |
|
5159
CALL
Zumiez
ZUMZ
$332M
| $124K | ﹤0.01% |
6,100
+5,300
| +663% | +$95K |
|
|
AHT
5160
PUT
Ashford Hospitality Trust
AHT
$20.9M
| $123K | ﹤0.01% |
6,380
+4,400
| +222% | +$96.9K |
|
|
CTLP
5161
CALL
DELISTED
Cantaloupe
CTLP
| $123K | ﹤0.01% |
16,700
+14,200
| +568% | +$98.1K |
|
5162
iShares MSCI Emerging Markets ex China ETF
EMXC
$23.5B
| $123K | ﹤0.01% |
2,221
+2,174
| +4,626% | +$112K |
|
5163
Hayward Holdings
HAYW
$3.21B
| $123K | ﹤0.01% |
+9,050
| New | +$111K |
|
5164
Liberty Broadband Class C
LBRDK
$4.88B
| $123K | ﹤0.01% |
+1,528
| New | +$128K |
|
5165
PUT
Napco Security Technologies
NSSC
$1.32B
| $123K | ﹤0.01% |
3,600
-5,800
| -62% | -$154K |
|
5166
POSCO
PKX
$16.1B
| $123K | ﹤0.01% |
+1,302
| New | +$118K |
|
5167
PUT
PROG Holdings
PRG
$1.75B
| $123K | ﹤0.01% |
4,000
+3,200
| +400% | +$93.9K |
|
|
TPH
5168
PUT
DELISTED
Tri Pointe Homes
TPH
| $123K | ﹤0.01% |
3,500
+900
| +35% | +$26.1K |
|
5169
PUT
Tronox
TROX
$932M
| $123K | ﹤0.01% |
8,700
+4,800
| +123% | +$58.9K |
|
5170
Vicor
VICR
$9.56B
| $123K | ﹤0.01% |
2,738
-5,647
| -67% | -$249K |
|
|
ABK
5171
PUT
DELISTED
Ambac Financial Group
ABK
| $123K | ﹤0.01% |
7,500
+3,300
| +79% | +$54.1K |
|
5172
CALL
Axalta
AXTA
$7.66B
| $122K | ﹤0.01% |
3,600
-31,700
| -90% | -$949K |
|
5173
Codexis
CDXS
$151M
| $122K | ﹤0.01% |
40,114
+38,016
| +1,812% | +$81.7K |
|
5174
CALL
Essential Properties Realty Trust
EPRT
$6.77B
| $122K | ﹤0.01% |
4,800
-7,100
| -60% | -$165K |
|
|
LADR
5175
CALL
Ladder Capital
LADR
$1.21B
| $122K | ﹤0.01% |
10,600
+2,900
| +38% | +$30.9K |
|
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.