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 | |
|---|---|---|---|---|---|---|
|
GRAL
3251
CALL
GRAIL Inc
GRAL
$2.87B
| $574K | ﹤0.01% |
22,500
+3,300
| +17% | +$102K |
|
3252
Solventum
SOLV
$13.9B
| $573K | ﹤0.01% |
7,546
-46,404
| -86% | -$3.46M |
|
3253
Murphy Oil
MUR
$5.38B
| $572K | ﹤0.01% |
20,156
+14,298
| +244% | +$403K |
|
3254
Assured Guaranty
AGO
$3.78B
| $571K | ﹤0.01% |
+6,484
| New | +$581K |
|
|
HSAI
3255
Hesai Group
HSAI
$2.42B
| $571K | ﹤0.01% |
38,595
-4,889
| -11% | -$83.3K |
|
|
BTFX
3256
CALL
DELISTED
Valkyrie ETF Trust II CoinShares Bitcoin Leverage ETF
BTFX
| $570K | ﹤0.01% |
+45,000
| New | +$2.13M |
|
3257
CALL
Rocket Pharmaceuticals
RCKT
$355M
| $569K | ﹤0.01% |
85,400
+80,500
| +1,643% | +$795K |
|
3258
Teekay
TK
$974M
| $569K | ﹤0.01% |
86,700
-26,660
| -24% | -$184K |
|
3259
CALL
NCR Voyix
VYX
$1.13B
| $569K | ﹤0.01% |
58,400
-7,800
| -12% | -$91.6K |
|
3260
CALL
Patterson-UTI
PTEN
$3.57B
| $568K | ﹤0.01% |
69,200
-26,900
| -28% | -$226K |
|
|
CTEV
3261
Claritev Corp
CTEV
$372M
| $568K | ﹤0.01% |
27,536
+3,675
| +15% | +$73.1K |
|
3262
PUT
Century Aluminum
CENX
$4.44B
| $567K | ﹤0.01% |
30,600
+10,100
| +49% | +$194K |
|
3263
CALL
Acadia Pharmaceuticals
ACAD
$4.35B
| $566K | ﹤0.01% |
34,100
-9,800
| -22% | -$178K |
|
3264
CALL
Aramark
ARMK
$15.2B
| $566K | ﹤0.01% |
16,400
-8,700
| -35% | -$320K |
|
3265
CALL
RPM International
RPM
$13.8B
| $566K | ﹤0.01% |
4,900
-1,900
| -28% | -$231K |
|
3266
CALL
MidCap Financial Investment
MFIC
$790M
| $565K | ﹤0.01% |
44,000
+24,300
| +123% | +$330K |
|
|
OTLY
3267
PUT
Oatly Group
OTLY
$447M
| $565K | ﹤0.01% |
57,500
+54,700
| +1,954% | +$592K |
|
3268
PUT
Urban Outfitters
URBN
$6.22B
| $565K | ﹤0.01% |
10,800
-207,700
| -95% | -$11.4M |
|
3269
APA Corp
APA
$12.3B
| $564K | ﹤0.01% |
26,849
-158,440
| -86% | -$3.48M |
|
3270
Clearwater Paper
CLW
$278M
| $564K | ﹤0.01% |
22,255
-15,281
| -41% | -$426K |
|
3271
CALL
Extra Space Storage
EXR
$31.3B
| $564K | ﹤0.01% |
3,800
+2,600
| +217% | +$394K |
|
3272
CALL
Zevra Therapeutics
ZVRA
$574M
| $564K | ﹤0.01% |
75,400
-82,200
| -52% | -$653K |
|
3273
PUT
KBR
KBR
$4.67B
| $562K | ﹤0.01% |
11,300
-37,700
| -77% | -$2.01M |
|
3274
PUT
Altimmune
ALT
$576M
| $561K | ﹤0.01% |
112,200
-169,400
| -60% | -$1.07M |
|
3275
CALL
Louisiana-Pacific
LPX
$5.19B
| $561K | ﹤0.01% |
6,100
-14,900
| -71% | -$1.56M |
|
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.