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 | |
|---|---|---|---|---|---|---|
3251
CALL
Terex
TEX
$7.79B
| $787K | ﹤0.01% |
13,700
-11,200
| -45% | -$579K |
|
|
CMA
3252
DELISTED
Comerica
CMA
| $786K | ﹤0.01% |
+14,093
| New | +$637K |
|
3253
PUT
Treace Medical Concepts
TMCI
$265M
| $786K | ﹤0.01% |
61,700
+56,000
| +982% | +$566K |
|
3254
CALL
Uranium Energy
UEC
$4.87B
| $786K | ﹤0.01% |
122,900
-41,300
| -25% | -$246K |
|
3255
CALL
Murphy USA
MUSA
$11.4B
| $784K | ﹤0.01% |
2,200
+400
| +22% | +$145K |
|
3256
Rogers Corp
ROG
$2.25B
| $784K | ﹤0.01% |
5,941
-138
| -2% | -$17.7K |
|
3257
PUT
Choice Hotels
CHH
$5.18B
| $781K | ﹤0.01% |
+6,900
| New | +$789K |
|
3258
CALL
RCI Hospitality Holdings
RICK
$202M
| $781K | ﹤0.01% |
11,800
+9,400
| +392% | +$548K |
|
|
DOOR
3259
DELISTED
MASONITE INTERNATIONAL CORP
DOOR
| $778K | ﹤0.01% |
9,200
+9,160
| +22,900% | +$793K |
|
3260
CALL
Build-A-Bear
BBW
$429M
| $777K | ﹤0.01% |
37,000
-86,000
| -70% | -$2.17M |
|
3261
CALL
RLX Technology
RLX
$2.47B
| $777K | ﹤0.01% |
388,600
-64,700
| -14% | -$120K |
|
3262
CALL
Triumph Financial Inc
TFIN
$1.82B
| $777K | ﹤0.01% |
9,700
-24,000
| -71% | -$1.62M |
|
3263
Xcel Energy
XEL
$50.5B
| $777K | ﹤0.01% |
12,560
-1,284
| -9% | -$77K |
|
3264
CALL
Old Republic International
ORI
$10.4B
| $776K | ﹤0.01% |
26,400
+21,400
| +428% | +$602K |
|
|
AMAM
3265
PUT
DELISTED
Ambrx Biopharma Inc
AMAM
| $776K | ﹤0.01% |
54,500
-59,000
| -52% | -$670K |
|
3266
LiveRamp
RAMP
$2.3B
| $775K | ﹤0.01% |
20,478
+19,298
| +1,635% | +$620K |
|
3267
BlueLinx
BXC
$453M
| $774K | ﹤0.01% |
6,831
+5,251
| +332% | +$455K |
|
3268
PUT
SM Energy
SM
$7.51B
| $774K | ﹤0.01% |
20,000
-50,800
| -72% | -$1.96M |
|
3269
Nokia
NOK
$50.4B
| $773K | ﹤0.01% |
226,085
+160,975
| +247% | +$547K |
|
3270
CALL
Arrowhead Research
ARWR
$12.2B
| $771K | ﹤0.01% |
25,200
-6,400
| -20% | -$170K |
|
3271
CALL
Blue Owl Capital
OBDC
$5.4B
| $771K | ﹤0.01% |
52,300
-72,500
| -58% | -$1.03M |
|
3272
CALL
Erie Indemnity
ERIE
$12B
| $770K | ﹤0.01% |
2,300
-4,200
| -65% | -$1.26M |
|
3273
CALL
Golar LNG
GLNG
$4.92B
| $770K | ﹤0.01% |
33,500
+7,600
| +29% | +$170K |
|
3274
Simply Good Foods
SMPL
$943M
| $770K | ﹤0.01% |
+19,469
| New | +$727K |
|
3275
iShares Russell 3000 ETF
IWV
$19.4B
| $769K | ﹤0.01% |
+2,811
| New | +$717K |
|
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.