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 | |
|---|---|---|---|---|---|---|
3376
Newell Brands
NWL
$2.2B
| $513K | ﹤0.01% |
82,809
-114,745
| -58% | -$921K |
|
3377
UiPath
PATH
$6.02B
| $513K | ﹤0.01% |
49,821
-393,130
| -89% | -$5.06M |
|
|
SAGE
3378
CALL
DELISTED
Sage Therapeutics
SAGE
| $513K | ﹤0.01% |
64,600
+5,400
| +9% | +$39.5K |
|
|
SERV
3379
PUT
Serve Robotics
SERV
$407M
| $513K | ﹤0.01% |
89,300
+29,000
| +48% | +$380K |
|
3380
CALL
WD-40
WDFC
$3.13B
| $512K | ﹤0.01% |
2,100
-200
| -9% | -$47.3K |
|
3381
CALL
Bio-Rad Laboratories Class A
BIO
$8.47B
| $511K | ﹤0.01% |
2,100
+1,900
| +950% | +$572K |
|
3382
CALL
FS KKR Capital
FSK
$3.04B
| $511K | ﹤0.01% |
24,400
+16,100
| +194% | +$360K |
|
3383
CALL
Global Ship Lease
GSL
$1.55B
| $511K | ﹤0.01% |
22,400
-52,900
| -70% | -$1.18M |
|
3384
CALL
Brown & Brown
BRO
$23.6B
| $510K | ﹤0.01% |
4,100
+600
| +17% | +$67K |
|
3385
State Street SPDR S&P Metals & Mining ETF
XME
$3.96B
| $510K | ﹤0.01% |
+9,109
| New | +$535K |
|
3386
PUT
Dorian LPG
LPG
$1.88B
| $509K | ﹤0.01% |
22,800
-15,200
| -40% | -$352K |
|
|
DX
3387
PUT
Dynex Capital
DX
$3B
| $507K | ﹤0.01% |
39,000
+35,900
| +1,158% | +$481K |
|
3388
CALL
Evolution Petroleum
EPM
$129M
| $507K | ﹤0.01% |
98,000
+38,100
| +64% | +$199K |
|
3389
CALL
Mama's Creations
MAMA
$825M
| $507K | ﹤0.01% |
78,000
-21,800
| -22% | -$150K |
|
|
SMLR
3390
CALL
DELISTED
Semler Scientific
SMLR
| $506K | ﹤0.01% |
14,000
+6,300
| +82% | +$295K |
|
3391
Tenet Healthcare
THC
$21B
| $506K | ﹤0.01% |
+3,764
| New | +$496K |
|
3392
PUT
Vanda Pharmaceuticals
VNDA
$314M
| $506K | ﹤0.01% |
110,300
+98,400
| +827% | +$459K |
|
3393
Mohawk Industries
MHK
$7.05B
| $505K | ﹤0.01% |
+4,427
| New | +$528K |
|
|
IRBT
3394
PUT
DELISTED
iRobot
IRBT
| $504K | ﹤0.01% |
187,000
+97,700
| +109% | +$706K |
|
3395
CALL
ITT
ITT
$17.7B
| $503K | ﹤0.01% |
3,900
+2,800
| +255% | +$399K |
|
3396
CALL
Mattel
MAT
$4.3B
| $503K | ﹤0.01% |
25,900
-39,100
| -60% | -$776K |
|
3397
uniQure
QURE
$2.63B
| $503K | ﹤0.01% |
47,524
-30,115
| -39% | -$422K |
|
3398
PUT
Virgin Galactic
SPCE
$325M
| $503K | ﹤0.01% |
166,300
-840,900
| -83% | -$3.69M |
|
|
VISN
3399
Vistance Networks Inc
VISN
$2.67B
| $502K | ﹤0.01% |
+94,693
| New | +$503K |
|
|
HEES
3400
PUT
DELISTED
H&E Equipment Services
HEES
| $502K | ﹤0.01% |
5,300
+4,000
| +308% | +$348K |
|
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.