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 | |
|---|---|---|---|---|---|---|
3876
CALL
Xeris Biopharma Holdings
XERS
$1.42B
| $318K | ﹤0.01% |
58,000
-5,600
| -9% | -$22.6K |
|
3877
Essex Property Trust
ESS
$18.9B
| $316K | ﹤0.01% |
1,032
+935
| +964% | +$273K |
|
3878
Global X Russell 2000 Covered Call ETF
RYLD
$1.37B
| $316K | ﹤0.01% |
+20,951
| New | +$338K |
|
3879
PUT
Zimmer Biomet
ZBH
$18.5B
| $316K | ﹤0.01% |
2,800
-125,800
| -98% | -$13.5M |
|
3880
CALL
Gevo
GEVO
$363M
| $315K | ﹤0.01% |
271,700
-251,900
| -48% | -$422K |
|
|
PLYA
3881
CALL
DELISTED
Playa Hotels & Resorts
PLYA
| $315K | ﹤0.01% |
23,700
+23,000
| +3,286% | +$298K |
|
3882
PUT
Biohaven
BHVN
$2.07B
| $314K | ﹤0.01% |
13,100
-12,300
| -48% | -$434K |
|
3883
PUT
dLocal
DLO
$4.38B
| $314K | ﹤0.01% |
37,700
-21,600
| -36% | -$243K |
|
3884
Global X Copper Miners ETF NEW
COPX
$7.07B
| $313K | ﹤0.01% |
8,016
-17,856
| -69% | -$715K |
|
3885
Ichor Holdings
ICHR
$2.37B
| $313K | ﹤0.01% |
13,846
+13,760
| +16,000% | +$406K |
|
3886
CALL
Vicor
VICR
$8.76B
| $313K | ﹤0.01% |
6,700
-3,200
| -32% | -$170K |
|
3887
Thomson Reuters
TRI
$45.1B
| $312K | ﹤0.01% |
+1,779
| New | +$307K |
|
3888
CALL
Dentsply Sirona
XRAY
$2.7B
| $312K | ﹤0.01% |
20,900
-71,000
| -77% | -$1.26M |
|
|
PRMB
3889
PUT
Primo Brands
PRMB
$8.54B
| $312K | ﹤0.01% |
8,800
+7,500
| +577% | +$245K |
|
3890
PUT
Cognex
CGNX
$10B
| $310K | ﹤0.01% |
10,400
+9,900
| +1,980% | +$349K |
|
3891
Banco Santander
SAN
$200B
| $310K | ﹤0.01% |
46,318
+22,332
| +93% | +$131K |
|
3892
PUT
Ardelyx
ARDX
$1.25B
| $309K | ﹤0.01% |
63,100
-65,800
| -51% | -$353K |
|
3893
CALL
Anterix
ATEX
$1.78B
| $307K | ﹤0.01% |
+8,400
| New | +$289K |
|
3894
CALL
SEALSQ Corp
LAES
$521M
| $307K | ﹤0.01% |
+118,300
| New | +$442K |
|
|
RNAM
3895
CALL
DELISTED
Avidity Biosciences
RNAM
| $307K | ﹤0.01% |
10,400
-118,000
| -92% | -$3.68M |
|
3896
Spectrum Brands
SPB
$2.08B
| $307K | ﹤0.01% |
4,294
+2,733
| +175% | +$214K |
|
|
XNET
3897
Xunlei
XNET
$334M
| $307K | ﹤0.01% |
68,377
+8,295
| +14% | +$27.7K |
|
3898
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$276M
| $306K | ﹤0.01% |
4,500
-11,500
| -72% | -$729K |
|
3899
CALL
Globant
GLOB
$1.52B
| $306K | ﹤0.01% |
2,600
+300
| +13% | +$53.8K |
|
|
JOYY
3900
PUT
JOYY Inc
JOYY
$3.77B
| $306K | ﹤0.01% |
7,300
-33,100
| -82% | -$1.49M |
|
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.