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 | |
|---|---|---|---|---|---|---|
2401
CALL
Children's Place
PLCE
$53.6M
| $1.37M | ﹤0.01% |
156,700
-42,400
| -21% | -$395K |
|
2402
CALL
RenaissanceRe
RNR
$13.7B
| $1.37M | ﹤0.01% |
5,700
+4,900
| +613% | +$1.19M |
|
2403
Boot Barn
BOOT
$4.55B
| $1.37M | ﹤0.01% |
+12,731
| New | +$1.7M |
|
2404
PUT
Dave & Buster's
PLAY
$343M
| $1.36M | ﹤0.01% |
77,700
-132,100
| -63% | -$3.13M |
|
2405
CALL
Schrodinger
SDGR
$1.12B
| $1.36M | ﹤0.01% |
69,100
+19,700
| +40% | +$443K |
|
2406
PUT
Lattice Semiconductor
LSCC
$17.6B
| $1.36M | ﹤0.01% |
26,000
-190,300
| -88% | -$11.3M |
|
2407
Acadia Pharmaceuticals
ACAD
$4.25B
| $1.36M | ﹤0.01% |
81,949
+71,406
| +677% | +$1.3M |
|
2408
Abercrombie & Fitch
ANF
$4.17B
| $1.36M | ﹤0.01% |
+17,823
| New | +$1.92M |
|
2409
PUT
Keros Therapeutics
KROS
$199M
| $1.36M | ﹤0.01% |
133,100
+123,000
| +1,218% | +$1.43M |
|
2410
CALL
Atlas Energy Solutions
AESI
$1.49B
| $1.35M | ﹤0.01% |
76,000
-73,000
| -49% | -$1.52M |
|
2411
CALL
Autoliv
ALV
$8.6B
| $1.35M | ﹤0.01% |
15,300
-800
| -5% | -$76.2K |
|
2412
PUT
New Oriental
EDU
$7.84B
| $1.35M | ﹤0.01% |
28,300
+11,300
| +66% | +$581K |
|
2413
CALL
UGI
UGI
$8B
| $1.35M | ﹤0.01% |
40,900
+500
| +1% | +$15.8K |
|
2414
PUT
Eldorado Gold
EGO
$8.31B
| $1.35M | ﹤0.01% |
80,300
-66,500
| -45% | -$999K |
|
2415
FTI Consulting
FCN
$4.82B
| $1.35M | ﹤0.01% |
+8,228
| New | +$1.48M |
|
2416
PUT
Levi Strauss
LEVI
$9.44B
| $1.35M | ﹤0.01% |
86,400
+41,900
| +94% | +$729K |
|
2417
CALL
SiTime
SITM
$16.6B
| $1.34M | ﹤0.01% |
8,800
+5,200
| +144% | +$998K |
|
2418
CALL
Owens Corning
OC
$11.5B
| $1.34M | ﹤0.01% |
9,400
-5,400
| -36% | -$893K |
|
2419
Corebridge Financial
CRBG
$14.1B
| $1.34M | ﹤0.01% |
42,476
+6,799
| +19% | +$220K |
|
2420
AerCap
AER
$23.9B
| $1.33M | ﹤0.01% |
13,076
+2,995
| +30% | +$296K |
|
2421
CALL
HEICO Corp Class A
HEI.A
$35.4B
| $1.33M | ﹤0.01% |
5,000
+3,200
| +178% | +$620K |
|
2422
PUT
Kimbell Royalty Partners
KRP
$1.47B
| $1.33M | ﹤0.01% |
95,300
+82,100
| +622% | +$1.24M |
|
2423
PUT
Appian
APPN
$1.74B
| $1.33M | ﹤0.01% |
46,300
+39,400
| +571% | +$1.29M |
|
2424
PUT
F5
FFIV
$22.1B
| $1.33M | ﹤0.01% |
5,000
-1,800
| -26% | -$503K |
|
2425
PUT
Delek Logistics
DKL
$3.04B
| $1.33M | ﹤0.01% |
30,700
-17,700
| -37% | -$753K |
|
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.