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 | |
|---|---|---|---|---|---|---|
2276
CALL
iRhythm Holdings
IRTC
$3.59B
| $2.21M | ﹤0.01% |
20,600
+5,900
| +40% | +$514K |
|
2277
CALL
Eos Energy Enterprises
EOSE
$1.23B
| $2.2M | ﹤0.01% |
2,020,600
+920,700
| +84% | +$1.34M |
|
2278
PUT
Schrodinger
SDGR
$1.12B
| $2.2M | ﹤0.01% |
61,500
+46,700
| +316% | +$1.35M |
|
2279
PUT
United Therapeutics
UTHR
$26.3B
| $2.2M | ﹤0.01% |
10,000
+9,400
| +1,567% | +$2.17M |
|
2280
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$105M
| $2.2M | ﹤0.01% |
92,100
-82,400
| -47% | -$1.83M |
|
2281
PUT
Fluor
FLR
$7.29B
| $2.19M | ﹤0.01% |
55,900
+28,200
| +102% | +$1.04M |
|
2282
CALL
CBRE Group
CBRE
$40.8B
| $2.19M | ﹤0.01% |
23,500
-9,600
| -29% | -$746K |
|
2283
PUT
Jack in the Box
JACK
$278M
| $2.19M | ﹤0.01% |
26,800
+25,300
| +1,687% | +$1.79M |
|
2284
CALL
2x Bitcoin ETF
BITX
$919M
| $2.18M | ﹤0.01% |
95,800
+88,200
| +1,161% | +$1.62M |
|
2285
PUT
Weyerhaeuser
WY
$17.3B
| $2.18M | ﹤0.01% |
62,700
+9,100
| +17% | +$283K |
|
2286
CALL
Valley National Bancorp
VLY
$7.93B
| $2.18M | ﹤0.01% |
200,400
+17,400
| +10% | +$156K |
|
2287
CALL
Banc of California
BANC
$3.28B
| $2.17M | ﹤0.01% |
+162,000
| New | +$2M |
|
2288
PUT
Repligen
RGEN
$7.44B
| $2.17M | ﹤0.01% |
12,100
+7,700
| +175% | +$1.2M |
|
|
TGH
2289
PUT
DELISTED
Textainer Group Holdings limited
TGH
| $2.17M | ﹤0.01% |
44,200
+42,700
| +2,847% | +$1.97M |
|
2290
PUT
Casey's General Stores
CASY
$31.9B
| $2.17M | ﹤0.01% |
7,900
+3,700
| +88% | +$1.01M |
|
2291
CALL
Vanguard FTSE Developed Markets ETF
VEA
$226B
| $2.17M | ﹤0.01% |
45,300
+41,500
| +1,092% | +$1.86M |
|
|
FOLD
2292
PUT
DELISTED
Amicus Therapeutics
FOLD
| $2.16M | ﹤0.01% |
152,300
+73,900
| +94% | +$839K |
|
2293
Aflac
AFL
$63.9B
| $2.16M | ﹤0.01% |
+26,134
| New | +$2.11M |
|
2294
CALL
Anavex Life Sciences
AVXL
$222M
| $2.16M | ﹤0.01% |
231,600
+118,900
| +106% | +$819K |
|
2295
US Global Jets ETF
JETS
$802M
| $2.15M | ﹤0.01% |
+113,285
| New | +$1.91M |
|
2296
PUT
Global Ship Lease
GSL
$1.57B
| $2.15M | ﹤0.01% |
108,600
+59,900
| +123% | +$1.09M |
|
2297
CALL
CRH
CRH
$66.7B
| $2.15M | ﹤0.01% |
31,100
-134,800
| -81% | -$8.14M |
|
2298
PUT
Arvinas
ARVN
$518M
| $2.14M | ﹤0.01% |
52,100
+3,600
| +7% | +$84.2K |
|
2299
PUT
ACM Research
ACMR
$5.83B
| $2.14M | ﹤0.01% |
109,700
+33,500
| +44% | +$586K |
|
2300
PUT
W.P. Carey
WPC
$17.1B
| $2.14M | ﹤0.01% |
44,400
+36,845
| +488% | +$2.12M |
|
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.