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 | |
|---|---|---|---|---|---|---|
3301
Norfolk Southern
NSC
$77.1B
| $554K | ﹤0.01% |
2,340
-768
| -25% | -$187K |
|
3302
ARS Pharmaceuticals
SPRY
$572M
| $554K | ﹤0.01% |
44,092
+31,786
| +258% | +$382K |
|
3303
PUT
Equinox Gold
EQX
$7.51B
| $553K | ﹤0.01% |
80,400
+45,100
| +128% | +$289K |
|
3304
PUT
Ichor Holdings
ICHR
$2.73B
| $553K | ﹤0.01% |
24,500
+23,600
| +2,622% | +$696K |
|
3305
PUT
Legend Biotech
LEGN
$3.73B
| $553K | ﹤0.01% |
16,300
-10,500
| -39% | -$377K |
|
3306
Hilton Worldwide
HLT
$75.3B
| $549K | ﹤0.01% |
2,413
-21,184
| -90% | -$5.28M |
|
3307
PUT
Amplify Energy
AMPY
$155M
| $548K | ﹤0.01% |
146,700
+125,700
| +599% | +$627K |
|
3308
Itron
ITRI
$3.76B
| $548K | ﹤0.01% |
+5,232
| New | +$548K |
|
3309
PUT
AllianceBernstein
AB
$3.54B
| $547K | ﹤0.01% |
14,300
-200
| -1% | -$7.53K |
|
3310
CALL
Outfront Media
OUT
$5.68B
| $547K | ﹤0.01% |
33,900
+32,143
| +1,829% | +$574K |
|
3311
PUT
Vermilion Energy
VET
$1.62B
| $546K | ﹤0.01% |
67,500
-48,300
| -42% | -$431K |
|
3312
CALL
Unum
UNM
$13.8B
| $545K | ﹤0.01% |
6,700
-14,700
| -69% | -$1.13M |
|
3313
Pultegroup
PHM
$24.9B
| $544K | ﹤0.01% |
+5,293
| New | +$572K |
|
3314
Sterling Infrastructure
STRL
$19.5B
| $543K | ﹤0.01% |
+4,801
| New | +$676K |
|
|
MSTU
3315
T-Rex 2X Long MSTR Daily Target ETF
MSTU
$365M
| $542K | ﹤0.01% |
9,931
-124,611
| -93% | -$10M |
|
3316
PUT
Brookfield Renewable
BEPC
$5.95B
| $541K | ﹤0.01% |
19,400
-63,700
| -77% | -$1.75M |
|
|
BZUN
3317
PUT
Baozun
BZUN
$164M
| $541K | ﹤0.01% |
198,300
+93,600
| +89% | +$297K |
|
3318
CALL
LegalZoom.com
LZ
$1.3B
| $541K | ﹤0.01% |
62,900
+28,000
| +80% | +$251K |
|
|
WNS
3319
PUT
DELISTED
WNS Holdings
WNS
| $541K | ﹤0.01% |
8,800
+7,500
| +577% | +$428K |
|
3320
W.P. Carey
WPC
$17B
| $541K | ﹤0.01% |
+8,586
| New | +$508K |
|
3321
PUT
Beam Therapeutics
BEAM
$2.58B
| $540K | ﹤0.01% |
27,700
+18,300
| +195% | +$479K |
|
3322
Bruker
BRKR
$9.14B
| $540K | ﹤0.01% |
+12,939
| New | +$673K |
|
3323
CALL
W.R. Berkley
WRB
$28.1B
| $540K | ﹤0.01% |
7,600
+6,800
| +850% | +$417K |
|
|
XNET
3324
PUT
Xunlei
XNET
$369M
| $540K | ﹤0.01% |
120,400
+76,500
| +174% | +$255K |
|
|
COOP
3325
PUT
DELISTED
Mr. Cooper
COOP
| $538K | ﹤0.01% |
4,500
-28,400
| -86% | -$2.97M |
|
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.