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 | |
|---|---|---|---|---|---|---|
4276
CALL
SkyWater Technology
SKYT
$1.5B
| $209K | ﹤0.01% |
29,600
-19,000
| -39% | -$186K |
|
4277
PUT
Tenable Holdings
TENB
$3.47B
| $209K | ﹤0.01% |
6,000
+800
| +15% | +$31.3K |
|
4278
Thor Industries
THO
$4.06B
| $209K | ﹤0.01% |
2,760
+2,255
| +447% | +$212K |
|
4279
CALL
Trex
TREX
$4.4B
| $209K | ﹤0.01% |
3,600
+1,800
| +100% | +$117K |
|
4280
CALL
Corpay
CPAY
$25.7B
| $209K | ﹤0.01% |
+600
| New | +$217K |
|
4281
PUT
Ouster
OUST
$2.11B
| $208K | ﹤0.01% |
23,200
+1,300
| +6% | +$12.8K |
|
|
SEE
4282
PUT
DELISTED
Sealed Air
SEE
| $208K | ﹤0.01% |
7,200
+3,000
| +71% | +$98.3K |
|
|
TEF
4283
DELISTED
Telefonica
TEF
| $208K | ﹤0.01% |
44,847
+43,731
| +3,919% | +$188K |
|
4284
CALL
Upbound Group
UPBD
$1.22B
| $208K | ﹤0.01% |
8,700
+7,400
| +569% | +$203K |
|
4285
CALL
Yext
YEXT
$573M
| $208K | ﹤0.01% |
33,800
-32,100
| -49% | -$207K |
|
|
GRAL
4286
GRAIL Inc
GRAL
$2.72B
| $208K | ﹤0.01% |
8,169
+3,960
| +94% | +$122K |
|
4287
PUT
Gildan
GIL
$9.49B
| $207K | ﹤0.01% |
4,700
+3,500
| +292% | +$174K |
|
4288
Kratos Defense & Security Solutions
KTOS
$8.23B
| $207K | ﹤0.01% |
6,981
+4,625
| +196% | +$140K |
|
4289
CALL
Teleflex
TFX
$5.96B
| $207K | ﹤0.01% |
1,500
-4,500
| -75% | -$729K |
|
4290
CALL
Federal Agricultural Mortgage Class A
AGM.A
$1.66B
| $206K | ﹤0.01% |
+1,100
| New | +$163K |
|
4291
PUT
Allegiant Air
ALGT
$2.57B
| $206K | ﹤0.01% |
4,000
-7,600
| -66% | -$611K |
|
4292
ProShares VIX Mid-Term Futures ETF
VIXM
$56.8M
| $206K | ﹤0.01% |
13,042
-2,811
| -18% | -$42.2K |
|
4293
CALL
Heron Therapeutics
HRTX
$93.4M
| $205K | ﹤0.01% |
93,600
+78,000
| +500% | +$151K |
|
4294
PUT
Old National Bancorp
ONB
$10.2B
| $205K | ﹤0.01% |
9,700
+9,400
| +3,133% | +$212K |
|
4295
CALL
Perimeter Solutions
PRM
$5.66B
| $205K | ﹤0.01% |
20,400
+16,800
| +467% | +$188K |
|
4296
Barnes & Noble Education
BNED
$435M
| $204K | ﹤0.01% |
19,485
-9,619
| -33% | -$99.3K |
|
4297
CALL
Expeditors International
EXPD
$22.3B
| $204K | ﹤0.01% |
1,700
-8,800
| -84% | -$1.01M |
|
4298
CALL
Geron
GERN
$898M
| $204K | ﹤0.01% |
128,900
+37,900
| +42% | +$92.3K |
|
4299
RLX Technology
RLX
$2.37B
| $204K | ﹤0.01% |
+108,681
| New | +$241K |
|
4300
TAL Education Group
TAL
$6.04B
| $204K | ﹤0.01% |
15,447
-30,682
| -67% | -$383K |
|
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.