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 | |
|---|---|---|---|---|---|---|
3601
PUT
AMN Healthcare
AMN
$1.33B
| $413K | ﹤0.01% |
16,900
+5,400
| +47% | +$139K |
|
3602
CALL
Porch Group
PRCH
$1.37B
| $413K | ﹤0.01% |
56,700
-66,000
| -54% | -$358K |
|
3603
PUT
Allison Transmission
ALSN
$10.1B
| $411K | ﹤0.01% |
4,300
+4,200
| +4,200% | +$446K |
|
|
DVAX
3604
CALL
DELISTED
Dynavax Technologies
DVAX
| $411K | ﹤0.01% |
31,700
-44,600
| -58% | -$590K |
|
3605
Equifax
EFX
$22B
| $411K | ﹤0.01% |
1,689
+964
| +133% | +$242K |
|
3606
CALL
Essential Properties Realty Trust
EPRT
$6.95B
| $411K | ﹤0.01% |
12,600
-2,300
| -15% | -$73K |
|
|
TPH
3607
PUT
DELISTED
Tri Pointe Homes
TPH
| $411K | ﹤0.01% |
12,900
+9,100
| +239% | +$311K |
|
|
GTLS
3608
DELISTED
Chart Industries
GTLS
| $410K | ﹤0.01% |
2,841
-9,049
| -76% | -$1.67M |
|
3609
CALL
Masco
MAS
$16.5B
| $410K | ﹤0.01% |
5,900
-3,100
| -34% | -$232K |
|
3610
CALL
Neurocrine Biosciences
NBIX
$18.4B
| $409K | ﹤0.01% |
3,700
-4,300
| -54% | -$545K |
|
3611
T-Rex 2X Inverse Tesla Daily Target ETF
TSLZ
$50.5M
| $409K | ﹤0.01% |
4,873
+3,815
| +361% | +$265K |
|
3612
PUT
Xponential Fitness
XPOF
$281M
| $409K | ﹤0.01% |
49,200
+45,400
| +1,195% | +$633K |
|
3613
PUT
Post Holdings
POST
$4.28B
| $407K | ﹤0.01% |
3,500
-24,800
| -88% | -$2.75M |
|
3614
Direxion Daily Financial Bear 3x ETF
FAZ
$82.4M
| $406K | ﹤0.01% |
+7,227
| New | +$413K |
|
3615
CALL
Vanda Pharmaceuticals
VNDA
$310M
| $406K | ﹤0.01% |
88,600
+71,200
| +409% | +$332K |
|
|
ZH
3616
Zhihu
ZH
$280M
| $406K | ﹤0.01% |
95,094
+81,672
| +608% | +$356K |
|
3617
CALL
Arrowhead Research
ARWR
$12B
| $405K | ﹤0.01% |
31,800
-22,000
| -41% | -$400K |
|
3618
Cadence Design Systems
CDNS
$94.3B
| $405K | ﹤0.01% |
+1,595
| New | +$444K |
|
3619
Mineralys Therapeutics
MLYS
$2.37B
| $405K | ﹤0.01% |
25,543
+25,206
| +7,480% | +$290K |
|
3620
CALL
Praxis Precision Medicines
PRAX
$8.28B
| $405K | ﹤0.01% |
10,700
-10,600
| -50% | -$662K |
|
3621
CALL
Vestis
VSTS
$2.03B
| $405K | ﹤0.01% |
41,000
+24,600
| +150% | +$327K |
|
3622
CALL
Viking Holdings
VIK
$46.8B
| $405K | ﹤0.01% |
10,200
-460,100
| -98% | -$21.2M |
|
|
LINE
3623
CALL
Lineage Inc
LINE
$9.73B
| $404K | ﹤0.01% |
6,900
-7,100
| -51% | -$414K |
|
3624
CALL
Costamare
CMRE
$1.86B
| $403K | ﹤0.01% |
41,000
-29,000
| -41% | -$320K |
|
3625
Rogers Corp
ROG
$2.14B
| $403K | ﹤0.01% |
5,977
-110
| -2% | -$9.46K |
|
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.