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 | |
|---|---|---|---|---|---|---|
3351
PUT
Veru
VERU
$36.6M
| $525K | ﹤0.01% |
107,220
+88,370
| +469% | +$548K |
|
3352
CALL
Leggett & Platt
LEG
$1.5B
| $524K | ﹤0.01% |
66,300
-23,100
| -26% | -$219K |
|
3353
CALL
Smith & Wesson
SWBI
$666M
| $523K | ﹤0.01% |
56,200
-1,800
| -3% | -$18.5K |
|
3354
CALL
Hallador Energy
HNRG
$717M
| $521K | ﹤0.01% |
42,500
-11,800
| -22% | -$133K |
|
|
MAPS
3355
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $521K | ﹤0.01% |
461,500
-1,300
| -0.3% | -$1.73K |
|
3356
Omeros
OMER
$821M
| $521K | ﹤0.01% |
63,465
-41,141
| -39% | -$363K |
|
3357
CALL
Repligen
RGEN
$7.39B
| $521K | ﹤0.01% |
4,100
-5,500
| -57% | -$847K |
|
3358
PUT
Illinois Tool Works
ITW
$81.9B
| $520K | ﹤0.01% |
2,100
+1,500
| +250% | +$385K |
|
3359
PUT
TORM
TRMD
$3.05B
| $520K | ﹤0.01% |
31,600
+19,600
| +163% | +$379K |
|
3360
CALL
Algoma Steel
ASTL
$463M
| $519K | ﹤0.01% |
95,900
-116,400
| -55% | -$874K |
|
|
GPGI
3361
CALL
GPGI Inc
GPGI
$4.12B
| $519K | ﹤0.01% |
119,600
-214,630
| -64% | -$2.63M |
|
3362
PUT
SiTime
SITM
$15.7B
| $519K | ﹤0.01% |
3,400
+3,100
| +1,033% | +$595K |
|
|
LTC
3363
CALL
LTC Properties
LTC
$2.15B
| $517K | ﹤0.01% |
14,600
+9,800
| +204% | +$341K |
|
|
LTC
3364
PUT
LTC Properties
LTC
$2.15B
| $517K | ﹤0.01% |
14,600
+13,800
| +1,725% | +$480K |
|
3365
PUT
Enpro
NPO
$6.95B
| $517K | ﹤0.01% |
3,200
+2,400
| +300% | +$431K |
|
3366
CALL
LendingTree
TREE
$564M
| $517K | ﹤0.01% |
10,300
-2,100
| -17% | -$93.6K |
|
|
KREF
3367
PUT
KKR Real Estate Finance Trust
KREF
$471M
| $516K | ﹤0.01% |
47,800
+400
| +0.8% | +$4.31K |
|
3368
CALL
Sportradar
SRAD
$4.34B
| $516K | ﹤0.01% |
23,900
+20,200
| +546% | +$421K |
|
3369
Valley National Bancorp
VLY
$7.94B
| $516K | ﹤0.01% |
+58,130
| New | +$550K |
|
3370
monday.com
MNDY
$3.47B
| $515K | ﹤0.01% |
+2,122
| New | +$561K |
|
3371
CALL
SELLAS Life Sciences
SLS
$2.13B
| $515K | ﹤0.01% |
477,600
-44,200
| -8% | -$52.5K |
|
3372
PUT
Modine Manufacturing
MOD
$12.2B
| $514K | ﹤0.01% |
6,700
-3,800
| -36% | -$374K |
|
3373
PUT
Candel Therapeutics
CADL
$730M
| $513K | ﹤0.01% |
90,800
+62,300
| +219% | +$509K |
|
3374
PUT
Camden Property Trust
CPT
$11.2B
| $513K | ﹤0.01% |
4,200
+3,000
| +250% | +$353K |
|
3375
PUT
ICU Medical
ICUI
$4.04B
| $513K | ﹤0.01% |
3,700
+3,500
| +1,750% | +$543K |
|
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.