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 | |
|---|---|---|---|---|---|---|
|
DAWN
6576
PUT
DELISTED
Day One Biopharmaceuticals
DAWN
| $29K | ﹤0.01% |
2,000
-300
| -13% | -$3.64K |
|
|
ESGR
6577
PUT
DELISTED
Enstar Group
ESGR
| $29K | ﹤0.01% |
+100
| New | +$26.1K |
|
|
EVRI
6578
CALL
DELISTED
Everi Holdings
EVRI
| $29K | ﹤0.01% |
2,600
-5,200
| -67% | -$58.6K |
|
6579
PUT
National Vision
EYE
$1.75B
| $29K | ﹤0.01% |
1,400
+1,100
| +367% | +$19.5K |
|
|
FARO
6580
PUT
DELISTED
Faro Technologies
FARO
| $29K | ﹤0.01% |
+1,300
| New | +$22.3K |
|
|
FFWM
6581
PUT
DELISTED
First Foundation Inc
FFWM
| $29K | ﹤0.01% |
3,000
-5,900
| -66% | -$37.6K |
|
6582
PUT
Hain Celestial
HAIN
$44.8M
| $29K | ﹤0.01% |
2,700
-156,000
| -98% | -$1.68M |
|
6583
PUT
ICU Medical
ICUI
$4.14B
| $29K | ﹤0.01% |
300
+100
| +50% | +$9.78K |
|
6584
CALL
IGC Pharma
IGC
$27M
| $29K | ﹤0.01% |
106,100
-1,800
| -2% | -$558 |
|
6585
Immunome
IMNM
$2.63B
| $29K | ﹤0.01% |
2,717
-12,222
| -82% | -$102K |
|
6586
CALL
Immunic
IMUX
$182M
| $29K | ﹤0.01% |
1,980
+810
| +69% | +$9.92K |
|
6587
CALL
INmune Bio
INMB
$45.5M
| $29K | ﹤0.01% |
2,600
+2,100
| +420% | +$17.6K |
|
6588
Liberty Global Class C
LBTYK
$3.4B
| $29K | ﹤0.01% |
1,596
+1,557
| +3,992% | +$27K |
|
6589
PUT
Lexicon Pharmaceuticals
LXRX
$1.04B
| $29K | ﹤0.01% |
+19,200
| New | +$22.8K |
|
6590
CALL
Everspin Technologies
MRAM
$328M
| $29K | ﹤0.01% |
3,300
-800
| -20% | -$7.42K |
|
6591
Mercury Systems
MRCY
$5.97B
| $29K | ﹤0.01% |
804
-1,067
| -57% | -$38.5K |
|
6592
CALL
NBT Bancorp
NBTB
$2.79B
| $29K | ﹤0.01% |
700
-300
| -30% | -$10.8K |
|
|
PINC
6593
CALL
DELISTED
Premier
PINC
| $29K | ﹤0.01% |
1,300
-3,200
| -71% | -$66.2K |
|
6594
ProShares Ultra Technology
ROM
$1.07B
| $29K | ﹤0.01% |
562
-470
| -46% | -$21.5K |
|
6595
Red Robin
RRGB
$139M
| $29K | ﹤0.01% |
2,385
-8,499
| -78% | -$79.3K |
|
6596
CALL
ARS Pharmaceuticals
SPRY
$563M
| $29K | ﹤0.01% |
5,400
-19,100
| -78% | -$83.7K |
|
6597
CALL
Cambria Tail Risk ETF
TAIL
$149M
| $29K | ﹤0.01% |
+600
| New | +$7.68K |
|
6598
Tootsie Roll Industries
TR
$2.94B
| $29K | ﹤0.01% |
+966
| New | +$28.3K |
|
|
VTYX
6599
DELISTED
Ventyx Biosciences
VTYX
| $29K | ﹤0.01% |
+12,103
| New | +$115K |
|
|
WOW
6600
CALL
DELISTED
WideOpenWest
WOW
| $29K | ﹤0.01% |
7,200
+4,100
| +132% | +$22.1K |
|
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.