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 | |
|---|---|---|---|---|---|---|
3451
PUT
Warner Music
WMG
$14.7B
| $476K | ﹤0.01% |
15,200
+1,300
| +9% | +$42.2K |
|
3452
PUT
Home BancShares
HOMB
$6.29B
| $474K | ﹤0.01% |
16,800
| – | – |
|
3453
CALL
Kulicke & Soffa
KLIC
$4.65B
| $474K | ﹤0.01% |
14,400
+9,900
| +220% | +$406K |
|
|
CMRX
3454
CALL
DELISTED
Chimerix, Inc.
CMRX
| $474K | ﹤0.01% |
55,800
+39,500
| +242% | +$218K |
|
|
UCTT
3455
PUT
Ultra Clean Holdings
UCTT
$3.4B
| $473K | ﹤0.01% |
22,100
+21,200
| +2,356% | +$677K |
|
3456
CALL
Icon
ICLR
$14.3B
| $472K | ﹤0.01% |
2,700
-1,700
| -39% | -$330K |
|
3457
PUT
Twist Bioscience
TWST
$5.27B
| $471K | ﹤0.01% |
12,000
+5,200
| +76% | +$234K |
|
3458
CALL
LivePerson
LPSN
$20.6M
| $470K | ﹤0.01% |
39,260
+2,940
| +8% | +$52.3K |
|
3459
CALL
La-Z-Boy
LZB
$1.65B
| $469K | ﹤0.01% |
12,000
-3,300
| -22% | -$143K |
|
3460
Packaging Corp of America
PKG
$22.7B
| $469K | ﹤0.01% |
+2,369
| New | +$506K |
|
3461
Jazz Pharmaceuticals
JAZZ
$16.3B
| $468K | ﹤0.01% |
3,771
+3,524
| +1,427% | +$460K |
|
|
TUZ
3462
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $468K | ﹤0.01% |
7,200
+2,300
| +47% | +$150K |
|
3463
PUT
Apple Hospitality REIT
APLE
$3.92B
| $467K | ﹤0.01% |
36,200
+23,100
| +176% | +$338K |
|
3464
Sibanye-Stillwater
SBSW
$5.88B
| $467K | ﹤0.01% |
102,022
-40,559
| -28% | -$154K |
|
3465
PUT
Teucrium Agricultural Fund
TAGS
$19.2M
| $466K | ﹤0.01% |
51,500
+30,900
| +150% | +$797K |
|
|
TWO
3466
CALL
Two Harbors Investment
TWO
$1.27B
| $466K | ﹤0.01% |
34,900
+28,200
| +421% | +$365K |
|
3467
PUT
Corteva
CTVA
$59.3B
| $465K | ﹤0.01% |
7,400
-37,600
| -84% | -$2.32M |
|
3468
Vodafone
VOD
$37.6B
| $464K | ﹤0.01% |
49,605
-253,189
| -84% | -$2.22M |
|
3469
Kinross Gold
KGC
$27.7B
| $463K | ﹤0.01% |
36,740
-159,931
| -81% | -$1.79M |
|
3470
Anterix
ATEX
$1.72B
| $462K | ﹤0.01% |
12,634
+12,511
| +10,172% | +$430K |
|
3471
Werner Enterprises
WERN
$2.39B
| $462K | ﹤0.01% |
+15,789
| New | +$530K |
|
|
MOMO
3472
PUT
Hello Group
MOMO
$873M
| $461K | ﹤0.01% |
73,100
-8,300
| -10% | -$60K |
|
3473
CALL
Adient
ADNT
$1.65B
| $460K | ﹤0.01% |
35,800
+16,500
| +85% | +$265K |
|
3474
PUT
Extra Space Storage
EXR
$32.1B
| $460K | ﹤0.01% |
3,100
-800
| -21% | -$121K |
|
3475
Vishay Precision Group
VPG
$1.22B
| $460K | ﹤0.01% |
+19,121
| New | +$447K |
|
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.