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 | |
|---|---|---|---|---|---|---|
426
CALL
eBay
EBAY
$49.3B
| $27.1M | 0.02% |
399,600
-106,600
| -21% | -$7.1M |
|
|
TEM
427
CALL
Tempus AI
TEM
$8.43B
| $27.1M | 0.02% |
560,900
+493,700
| +735% | +$26.7M |
|
428
Arm
ARM
$303B
| $27M | 0.02% |
252,824
+67,022
| +36% | +$9.35M |
|
429
PUT
XPeng
XPEV
$12.3B
| $26.9M | 0.02% |
1,298,900
-173,400
| -12% | -$3.12M |
|
|
NBIS
430
CALL
Nebius Group N.V.
NBIS
$55.4B
| $26.8M | 0.02% |
1,270,100
+919,500
| +262% | +$30.3M |
|
431
PUT
Colgate-Palmolive
CL
$73.3B
| $26.6M | 0.02% |
284,300
+116,300
| +69% | +$10.4M |
|
432
CALL
Warner Bros
WBD
$64.8B
| $26.6M | 0.02% |
2,478,300
-2,782,100
| -53% | -$29.1M |
|
433
CALL
Nice
NICE
$5.19B
| $26.5M | 0.02% |
172,000
+93,600
| +119% | +$15M |
|
434
PUT
Expedia Group
EXPE
$31.3B
| $26.5M | 0.02% |
157,400
+7,500
| +5% | +$1.37M |
|
435
CALL
Vale
VALE
$63.2B
| $26.2M | 0.02% |
2,628,400
-2,408,000
| -48% | -$22.8M |
|
436
PUT
McKesson
MCK
$95.3B
| $26.2M | 0.02% |
38,900
+12,500
| +47% | +$7.73M |
|
437
CALL
Unity
U
$12.8B
| $26.1M | 0.02% |
1,334,900
-769,300
| -37% | -$17.4M |
|
438
PUT
Accenture
ACN
$85.7B
| $26M | 0.02% |
83,300
-46,100
| -36% | -$16.3M |
|
|
439
CALL
McKesson
MCK
$95.3B
| $26M | 0.02% |
38,600
+24,200
| +168% | +$15M |
|
440
CALL
Upstart Holdings
UPST
$2.74B
| $25.8M | 0.02% |
560,900
-61,900
| -10% | -$3.85M |
|
441
Cigna
CI
$75.4B
| $25.8M | 0.02% |
78,302
-8,753
| -10% | -$2.64M |
|
442
PUT
PepsiCo
PEP
$185B
| $25.7M | 0.02% |
260,200
-119,700
| -32% | -$17.8M |
|
|
SCIU
443
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $25.7M | 0.02% |
1,049,700
+203,300
| +24% | +$4.97M |
|
444
CALL
Rocket Lab Corp
RKLB
$43.6B
| $25.6M | 0.02% |
1,431,300
-21,000
| -1% | -$503K |
|
445
CALL
Hershey
HSY
$35B
| $25.6M | 0.02% |
149,400
-171,900
| -54% | -$28.1M |
|
446
CALL
Tapestry
TPR
$29B
| $25.4M | 0.02% |
360,800
+104,400
| +41% | +$7.9M |
|
447
PUT
Dollar General
DG
$26.5B
| $25.4M | 0.02% |
288,400
-123,600
| -30% | -$9.36M |
|
448
PUT
Live Nation Entertainment
LYV
$41.4B
| $25.3M | 0.02% |
193,900
+92,400
| +91% | +$12.6M |
|
449
PUT
Danaher
DHR
$127B
| $25.3M | 0.02% |
123,300
-25,000
| -17% | -$5.46M |
|
450
PUT
Workday
WDAY
$32.7B
| $25.2M | 0.02% |
107,800
-5,100
| -5% | -$1.3M |
|
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.