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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
TJX Companies
TJX
$169B
| $26.9M | 0.01% |
185,900
-60,700
| -25% | -$8.06M |
|
527
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$741M
| $26.9M | 0.01% |
555,700
+240,300
| +76% | +$4.91M |
|
528
Marvell Technology
MRVL
$187B
| $26.8M | 0.01% |
318,460
+189,577
| +147% | +$14M |
|
529
CALL
Credo Technology Group
CRDO
$43.8B
| $26.7M | 0.01% |
183,700
+57,000
| +45% | +$6.98M |
|
530
PUT
Humana
HUM
$47.1B
| $26.5M | 0.01% |
101,900
-66,100
| -39% | -$17.4M |
|
531
CALL
Sharplink Inc
SBET
$1.27B
| $26.4M | 0.01% |
1,554,800
+1,329,000
| +589% | +$26.1M |
|
532
PUT
Mercado Libre
MELI
$91.2B
| $26.4M | 0.01% |
11,300
-2,800
| -20% | -$6.72M |
|
533
CALL
Archer Daniels Midland
ADM
$41.8B
| $26.3M | 0.01% |
440,800
+114,300
| +35% | +$6.69M |
|
534
CALL
Teva Pharmaceuticals
TEVA
$35.6B
| $26.3M | 0.01% |
1,301,800
+87,900
| +7% | +$1.54M |
|
535
CALL
Ford
F
$56.3B
| $26.3M | 0.01% |
2,198,400
+88,400
| +4% | +$1.02M |
|
536
PUT
Fortinet
FTNT
$112B
| $26.2M | 0.01% |
311,700
+187,700
| +151% | +$16.7M |
|
537
CALL
Devon Energy
DVN
$52.4B
| $26.2M | 0.01% |
746,900
-20,000
| -3% | -$681K |
|
538
CALL
Roku
ROKU
$21B
| $26.1M | 0.01% |
261,100
+22,600
| +9% | +$2.08M |
|
539
CALL
Dollar Tree
DLTR
$22.8B
| $26M | 0.01% |
275,300
-277,900
| -50% | -$29.7M |
|
540
PUT
Microchip Technology
MCHP
$43.9B
| $26M | 0.01% |
404,500
-80,700
| -17% | -$5.47M |
|
541
PUT
Lockheed Martin
LMT
$131B
| $25.9M | 0.01% |
74,600
-4,400
| -6% | -$2M |
|
542
PUT
Norwegian Cruise Line
NCLH
$8.56B
| $25.8M | 0.01% |
1,048,300
+121,600
| +13% | +$2.95M |
|
543
CALL
Waste Management
WM
$95.3B
| $25.7M | 0.01% |
116,200
+7,900
| +7% | +$1.78M |
|
544
PUT
ON Semiconductor
ON
$34.6B
| $25.6M | 0.01% |
519,700
-2,500
| -0.5% | -$132K |
|
545
CALL
Southern Company
SO
$108B
| $25.4M | 0.01% |
268,500
+131,000
| +95% | +$12.2M |
|
546
CALL
Fair Isaac
FICO
$27.8B
| $25.4M | 0.01% |
17,000
+8,300
| +95% | +$12.5M |
|
547
CALL
D.R. Horton
DHI
$39.3B
| $25.4M | 0.01% |
150,000
+26,100
| +21% | +$4.1M |
|
548
CALL
Las Vegas Sands
LVS
$30.5B
| $25.3M | 0.01% |
471,100
+25,600
| +6% | +$1.35M |
|
549
CALL
BigBear.ai
BBAI
$1.37B
| $25.3M | 0.01% |
3,884,000
+1,625,100
| +72% | +$10.4M |
|
550
PUT
Pinterest
PINS
$12.2B
| $25.1M | 0.01% |
781,000
-158,300
| -17% | -$5.74M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.