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 | |
|---|---|---|---|---|---|---|
5751
PUT
Regenxbio
RGNX
$627M
| $70K | ﹤0.01% |
3,900
+1,400
| +56% | +$24.7K |
|
5752
PUT
RE/MAX Holdings
RMAX
$194M
| $70K | ﹤0.01% |
+5,300
| New | +$58.1K |
|
5753
CALL
Telos
TLS
$328M
| $70K | ﹤0.01% |
19,300
+16,800
| +672% | +$55.7K |
|
|
WPRT
5754
PUT
Westport Fuel Systems
WPRT
$33.8M
| $70K | ﹤0.01% |
15,500
+6,600
| +74% | +$41.7K |
|
5755
PUT
West Pharmaceutical
WST
$23.8B
| $70K | ﹤0.01% |
200
-1,900
| -90% | -$672K |
|
5756
State Street SPDR S&P Software & Services ETF
XSW
$437M
| $70K | ﹤0.01% |
470
-970
| -67% | -$129K |
|
|
ACCD
5757
CALL
DELISTED
Accolade Inc
ACCD
| $70K | ﹤0.01% |
5,900
+3,900
| +195% | +$33.4K |
|
5758
PUT
Aspen Aerogels
ASPN
$375M
| $69K | ﹤0.01% |
4,400
+2,500
| +132% | +$25.8K |
|
5759
PUT
AZZ Inc
AZZ
$4.39B
| $69K | ﹤0.01% |
1,200
+700
| +140% | +$34.4K |
|
5760
Americold
COLD
$4.01B
| $69K | ﹤0.01% |
+2,291
| New | +$64.1K |
|
|
GOOS
5761
Canada Goose Holdings
GOOS
$884M
| $69K | ﹤0.01% |
5,853
-1,949
| -25% | -$23.1K |
|
5762
PUT
Haleon
HLN
$43.6B
| $69K | ﹤0.01% |
8,400
-5,100
| -38% | -$42K |
|
5763
PUT
INmune Bio
INMB
$45.7M
| $69K | ﹤0.01% |
6,200
-800
| -11% | -$6.71K |
|
|
RWT
5764
CALL
Redwood Trust
RWT
$570M
| $69K | ﹤0.01% |
9,400
-175,600
| -95% | -$1.23M |
|
5765
2x Long VIX Futures ETF
UVIX
$262M
| $69K | ﹤0.01% |
25
+10
| +67% | +$50.7K |
|
5766
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.31B
| $69K | ﹤0.01% |
813
+662
| +438% | +$49.4K |
|
|
ICVX
5767
CALL
DELISTED
Icosavax, Inc. Common Stock
ICVX
| $69K | ﹤0.01% |
4,400
+4,000
| +1,000% | +$38.5K |
|
5768
Ambev
ABEV
$48.1B
| $68K | ﹤0.01% |
24,402
-165,639
| -87% | -$447K |
|
5769
PUT
ADT
ADT
$5.59B
| $68K | ﹤0.01% |
10,000
+7,500
| +300% | +$46.8K |
|
|
BORR
5770
CALL
Borr Drilling
BORR
$1.25B
| $68K | ﹤0.01% |
9,300
-34,900
| -79% | -$230K |
|
|
HEES
5771
PUT
DELISTED
H&E Equipment Services
HEES
| $68K | ﹤0.01% |
+1,300
| New | +$58.7K |
|
5772
Huazhu Hotels Group
HTHT
$13.1B
| $68K | ﹤0.01% |
+2,043
| New | +$73K |
|
5773
PUT
Immunocore
IMCR
$1.68B
| $68K | ﹤0.01% |
+1,000
| New | +$52K |
|
|
IMMP
5774
Immutep
IMMP
$56M
| $68K | ﹤0.01% |
+28,385
| New | +$56.1K |
|
5775
Integer Holdings
ITGR
$3.41B
| $68K | ﹤0.01% |
+694
| New | +$59.7K |
|
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.