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 | |
|---|---|---|---|---|---|---|
2526
CALL
Vital Farms
VITL
$558M
| $1.2M | ﹤0.01% |
39,300
-103,500
| -72% | -$3.72M |
|
2527
CALL
Eldorado Gold
EGO
$8.31B
| $1.2M | ﹤0.01% |
71,100
-82,700
| -54% | -$1.24M |
|
2528
Galicia Financial Group
GGAL
$7.92B
| $1.2M | ﹤0.01% |
+21,956
| New | +$1.36M |
|
2529
PUT
Cimpress
CMPR
$2.37B
| $1.19M | ﹤0.01% |
+26,400
| New | +$1.48M |
|
2530
Dynatrace
DT
$12.1B
| $1.19M | ﹤0.01% |
+25,258
| New | +$1.38M |
|
2531
FMC
FMC
$1.42B
| $1.19M | ﹤0.01% |
+28,206
| New | +$1.25M |
|
2532
NiSource
NI
$22.4B
| $1.19M | ﹤0.01% |
+29,702
| New | +$1.14M |
|
2533
PUT
Rockwell Automation
ROK
$51.4B
| $1.19M | ﹤0.01% |
4,600
-15,800
| -77% | -$4.4M |
|
2534
CALL
Zimmer Biomet
ZBH
$17.7B
| $1.19M | ﹤0.01% |
10,500
-17,000
| -62% | -$1.82M |
|
2535
CALL
Mirion Technologies
MIR
$4.05B
| $1.19M | ﹤0.01% |
81,900
-165,800
| -67% | -$2.61M |
|
2536
PUT
Bumble
BMBL
$367M
| $1.18M | ﹤0.01% |
272,800
-351,200
| -56% | -$2.29M |
|
2537
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $1.18M | ﹤0.01% |
39,200
-12,500
| -24% | -$409K |
|
2538
PUT
PureCycle Technologies
PCT
$1.17B
| $1.18M | ﹤0.01% |
170,800
-59,000
| -26% | -$530K |
|
2539
CALL
Rambus
RMBS
$10.4B
| $1.18M | ﹤0.01% |
22,800
-18,200
| -44% | -$1.07M |
|
2540
CALL
Paycom
PAYC
$6.78B
| $1.18M | ﹤0.01% |
5,400
-9,600
| -64% | -$2.03M |
|
2541
CALL
PACS Group
PACS
$7.42B
| $1.18M | ﹤0.01% |
104,900
+56,300
| +116% | +$739K |
|
2542
American Water Works
AWK
$26.3B
| $1.18M | ﹤0.01% |
7,979
+1,720
| +27% | +$227K |
|
2543
CALL
Velocity Financial
VEL
$683M
| $1.17M | ﹤0.01% |
62,800
+44,800
| +249% | +$843K |
|
2544
Roivant Sciences
ROIV
$25.2B
| $1.17M | ﹤0.01% |
+116,204
| New | +$1.26M |
|
2545
Full Truck Alliance
YMM
$9.56B
| $1.17M | ﹤0.01% |
+91,829
| New | +$1.11M |
|
|
BTC
2546
Grayscale Bitcoin Mini Trust ETF
BTC
$3.4B
| $1.17M | ﹤0.01% |
32,121
+22,557
| +236% | +$931K |
|
2547
PUT
ARS Pharmaceuticals
SPRY
$590M
| $1.17M | ﹤0.01% |
93,100
+79,100
| +565% | +$952K |
|
2548
PUT
GigaCloud Technology
GCT
$1.35B
| $1.17M | ﹤0.01% |
82,400
+36,800
| +81% | +$671K |
|
2549
CALL
ZTO Express
ZTO
$18.2B
| $1.17M | ﹤0.01% |
59,000
-25,000
| -30% | -$488K |
|
2550
PUT
Huazhu Hotels Group
HTHT
$12.4B
| $1.17M | ﹤0.01% |
31,600
+3,500
| +12% | +$121K |
|
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.