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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2851
PUT
Brown & Brown
BRO
$22.9B
| $858K | ﹤0.01% |
6,900
+6,700
| +3,350% | +$749K |
|
|
GRAL
2852
PUT
GRAIL Inc
GRAL
$2.91B
| $858K | ﹤0.01% |
33,600
+3,700
| +12% | +$114K |
|
2853
Bumble
BMBL
$367M
| $857K | ﹤0.01% |
197,578
+134,695
| +214% | +$877K |
|
2854
PUT
Hawaiian Electric Industries
HE
$2.33B
| $857K | ﹤0.01% |
78,300
-44,800
| -36% | -$453K |
|
2855
Howard Hughes
HHH
$3.93B
| $857K | ﹤0.01% |
+11,574
| New | +$874K |
|
2856
Middleby
MIDD
$6.05B
| $857K | ﹤0.01% |
5,645
+4,809
| +575% | +$754K |
|
2857
Novavax
NVAX
$1.23B
| $856K | ﹤0.01% |
133,547
-672,437
| -83% | -$5.56M |
|
2858
PUT
HEICO Corp Class A
HEI.A
$35.4B
| $855K | ﹤0.01% |
3,200
-1,000
| -24% | -$194K |
|
|
TUZ
2859
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $855K | ﹤0.01% |
13,900
+9,500
| +216% | +$584K |
|
|
JNPR
2860
PUT
DELISTED
Juniper Networks
JNPR
| $854K | ﹤0.01% |
23,600
-23,700
| -50% | -$867K |
|
2861
CALL
IAMGOLD
IAG
$8.47B
| $851K | ﹤0.01% |
136,300
+42,800
| +46% | +$253K |
|
2862
CALL
Kinetik
KNTK
$3.71B
| $851K | ﹤0.01% |
16,400
+10,900
| +198% | +$639K |
|
2863
CALL
MoonLake Immunotherapeutics
MLTX
$1.59B
| $851K | ﹤0.01% |
21,800
+18,600
| +581% | +$801K |
|
2864
PUT
Teradata
TDC
$2.68B
| $851K | ﹤0.01% |
37,900
+37,100
| +4,638% | +$1M |
|
2865
CALL
TMC The Metals Company
TMC
$1.59B
| $850K | ﹤0.01% |
494,500
-364,000
| -42% | -$612K |
|
2866
Zions Bancorporation
ZION
$10.1B
| $850K | ﹤0.01% |
+17,053
| New | +$918K |
|
2867
PUT
Chemours
CC
$2.59B
| $849K | ﹤0.01% |
62,800
+3,200
| +5% | +$53.1K |
|
2868
PUT
Huntington Bancshares
HBAN
$35.1B
| $849K | ﹤0.01% |
56,600
-182,900
| -76% | -$2.95M |
|
2869
CALL
iRhythm Holdings
IRTC
$3.59B
| $847K | ﹤0.01% |
8,100
-3,000
| -27% | -$318K |
|
2870
PUT
Pinnacle West Capital
PNW
$12.9B
| $847K | ﹤0.01% |
8,900
+8,700
| +4,350% | +$777K |
|
2871
MINISO
MNSO
$3.64B
| $846K | ﹤0.01% |
45,756
+32,802
| +253% | +$716K |
|
2872
PUT
Banco Macro
BMA
$5.7B
| $845K | ﹤0.01% |
11,200
+9,300
| +489% | +$869K |
|
2873
Comstock Resources
CRK
$3.97B
| $845K | ﹤0.01% |
41,574
-39,262
| -49% | -$752K |
|
2874
CALL
Grocery Outlet
GO
$891M
| $844K | ﹤0.01% |
60,400
+56,800
| +1,578% | +$840K |
|
2875
Viasat
VSAT
$9.79B
| $842K | ﹤0.01% |
+80,871
| New | +$779K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.