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 | |
|---|---|---|---|---|---|---|
4351
PUT
MaxLinear
MXL
$5.22B
| $268K | ﹤0.01% |
11,300
-12,700
| -53% | -$249K |
|
4352
CALL
Atmus Filtration Technologies
ATMU
$4.12B
| $267K | ﹤0.01% |
11,400
-15,100
| -57% | -$324K |
|
|
ESPR
4353
PUT
DELISTED
Esperion Therapeutics
ESPR
| $267K | ﹤0.01% |
89,600
+87,600
| +4,380% | +$114K |
|
4354
PUT
Invesco
IVZ
$12.4B
| $267K | ﹤0.01% |
15,000
+8,500
| +131% | +$123K |
|
4355
PUT
Masco
MAS
$14.7B
| $267K | ﹤0.01% |
4,000
-500
| -11% | -$29K |
|
4356
CALL
Qfin Holdings
QFIN
$1.67B
| $267K | ﹤0.01% |
16,900
+4,800
| +40% | +$73.5K |
|
4357
CALL
SkyWater Technology
SKYT
$1.5B
| $267K | ﹤0.01% |
27,800
+3,600
| +15% | +$24.1K |
|
4358
Array Technologies
ARRY
$735M
| $266K | ﹤0.01% |
+15,863
| New | +$274K |
|
4359
PUT
Capitol Federal Financial
CFFN
$1.08B
| $266K | ﹤0.01% |
41,300
+40,700
| +6,783% | +$218K |
|
4360
CALL
Extreme Networks
EXTR
$3.82B
| $266K | ﹤0.01% |
15,100
-24,200
| -62% | -$457K |
|
4361
PUT
Hycroft Mining Holding Corp
HYMC
$1.78B
| $266K | ﹤0.01% |
108,700
+98,250
| +940% | +$237K |
|
4362
PUT
Ramaco Resources Class A
METC
$622M
| $266K | ﹤0.01% |
16,021
+10,646
| +198% | +$148K |
|
|
NINE
4363
CALL
DELISTED
Nine Energy Service
NINE
| $266K | ﹤0.01% |
99,300
+55,900
| +129% | +$162K |
|
4364
CALL
ACV Auctions
ACVA
$1.41B
| $265K | ﹤0.01% |
17,500
-12,300
| -41% | -$180K |
|
4365
CALL
GigaCloud Technology
GCT
$1.56B
| $265K | ﹤0.01% |
+14,500
| New | +$160K |
|
4366
OptimizeRx
OPRX
$119M
| $265K | ﹤0.01% |
+18,531
| New | +$178K |
|
4367
PUT
Powell Industries
POWL
$6.76B
| $265K | ﹤0.01% |
+9,000
| New | +$251K |
|
4368
PUT
Pacer Trendpilot US Large Cap ETF
PTLC
$3.19B
| $265K | ﹤0.01% |
5,100
+2,500
| +96% | +$103K |
|
4369
CALL
Treace Medical Concepts
TMCI
$261M
| $265K | ﹤0.01% |
20,800
+20,500
| +6,833% | +$207K |
|
4370
PUT
Vita Coco
COCO
$3.9B
| $264K | ﹤0.01% |
10,300
-143,700
| -93% | -$3.9M |
|
4371
PUT
CorMedix
CRMD
$560M
| $264K | ﹤0.01% |
70,300
+37,900
| +117% | +$130K |
|
|
FBRT
4372
CALL
Franklin BSP Realty Trust
FBRT
$583M
| $264K | ﹤0.01% |
19,600
+18,200
| +1,300% | +$240K |
|
|
AIFU
4373
PUT
AIFU Inc
AIFU
$193M
| $264K | ﹤0.01% |
100
+99
| +9,900% | +$273K |
|
|
ASRT
4374
CALL
DELISTED
Assertio
ASRT
| $263K | ﹤0.01% |
16,420
-7,693
| -32% | -$190K |
|
4375
Gray Television
GTN
$437M
| $263K | ﹤0.01% |
+29,365
| New | +$219K |
|
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.