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 | |
|---|---|---|---|---|---|---|
3501
PUT
Innodata
INOD
$1.88B
| $448K | ﹤0.01% |
12,500
+5,300
| +74% | +$233K |
|
|
PMT
3502
CALL
PennyMac Mortgage Investment
PMT
$860M
| $448K | ﹤0.01% |
30,600
+22,600
| +283% | +$310K |
|
3503
PUT
Public Storage
PSA
$62.2B
| $448K | ﹤0.01% |
1,500
-1,700
| -53% | -$508K |
|
|
WAY
3504
PUT
Waystar Holding Corp
WAY
$4.6B
| $448K | ﹤0.01% |
12,000
+11,800
| +5,900% | +$467K |
|
3505
Bausch Health
BHC
$1.68B
| $447K | ﹤0.01% |
69,230
+3,573
| +5% | +$25.7K |
|
3506
PUT
Talkspace
TALK
$876M
| $447K | ﹤0.01% |
174,700
+154,300
| +756% | +$481K |
|
3507
PUT
Weyerhaeuser
WY
$17.7B
| $447K | ﹤0.01% |
15,300
+11,500
| +303% | +$342K |
|
3508
CALL
American Battery Technology Co
ABAT
$292M
| $446K | ﹤0.01% |
433,100
+321,500
| +288% | +$436K |
|
|
MRUS
3509
CALL
DELISTED
Merus
MRUS
| $446K | ﹤0.01% |
10,600
+9,800
| +1,225% | +$427K |
|
3510
Schneider National
SNDR
$6.34B
| $446K | ﹤0.01% |
+19,552
| New | +$530K |
|
3511
CALL
Krispy Kreme
DNUT
$564M
| $445K | ﹤0.01% |
90,600
+44,500
| +97% | +$340K |
|
3512
Repligen
RGEN
$8.42B
| $445K | ﹤0.01% |
3,504
+223
| +7% | +$34.3K |
|
3513
CALL
Utz Brands
UTZ
$1.25B
| $444K | ﹤0.01% |
31,600
+20,400
| +182% | +$281K |
|
|
ANSS
3514
PUT
DELISTED
Ansys
ANSS
| $443K | ﹤0.01% |
1,400
-300
| -18% | -$101K |
|
3515
CALL
Warrior Met Coal
HCC
$4.18B
| $443K | ﹤0.01% |
9,300
-23,700
| -72% | -$1.21M |
|
3516
Entegris
ENTG
$18.3B
| $442K | ﹤0.01% |
+5,059
| New | +$510K |
|
3517
Rocket Lab Corp
RKLB
$38.7B
| $442K | ﹤0.01% |
24,763
+11,655
| +89% | +$279K |
|
3518
CALL
Clearway Energy Class C
CWEN
$4.89B
| $441K | ﹤0.01% |
14,900
+1,000
| +7% | +$27.2K |
|
3519
CALL
Church & Dwight Co
CHD
$23.9B
| $440K | ﹤0.01% |
4,000
+600
| +18% | +$64.2K |
|
3520
CALL
AppFolio
APPF
$6.54B
| $439K | ﹤0.01% |
2,000
+600
| +43% | +$138K |
|
3521
PUT
Advanced Energy
AEIS
$10.8B
| $438K | ﹤0.01% |
4,600
+1,900
| +70% | +$217K |
|
|
ARIS
3522
CALL
DELISTED
Aris Water Solutions
ARIS
| $438K | ﹤0.01% |
13,700
+9,800
| +251% | +$278K |
|
3523
CALL
AerSale
ASLE
$307M
| $438K | ﹤0.01% |
58,500
+37,100
| +173% | +$265K |
|
3524
Air Products & Chemicals
APD
$65.8B
| $437K | ﹤0.01% |
+1,485
| New | +$458K |
|
|
AZUL
3525
PUT
DELISTED
Azul
AZUL
| $436K | ﹤0.01% |
266,400
+115,900
| +77% | +$228K |
|
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.