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 Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2751
PUT
MKS Inc
MKSI
$17.6B
| $1.02M | ﹤0.01% |
2,300
+2,100
| +1,050% | +$657K |
|
|
PRMB
2752
PUT
Primo Brands
PRMB
$7.06B
| $1.02M | ﹤0.01% |
41,800
-199,000
| -83% | -$4.42M |
|
2753
PUT
dLocal
DLO
$4.14B
| $1.02M | ﹤0.01% |
78,500
+19,300
| +33% | +$245K |
|
2754
PUT
Zymeworks
ZYME
$1.9B
| $1.02M | ﹤0.01% |
39,000
+30,400
| +353% | +$772K |
|
2755
CALL
Virtu Financial
VIRT
$4.72B
| $1.02M | ﹤0.01% |
17,100
+16,600
| +3,320% | +$873K |
|
2756
HEICO Corp
HEI
$43.1B
| $1.02M | ﹤0.01% |
2,859
+566
| +25% | +$172K |
|
2757
Qiagen
QGEN
$9.12B
| $1.02M | ﹤0.01% |
26,002
-21,720
| -46% | -$807K |
|
2758
CALL
Corbus Pharmaceuticals
CRBP
$138M
| $1.01M | ﹤0.01% |
108,200
+16,600
| +18% | +$157K |
|
2759
MACOM Technology Solutions
MTSI
$21.8B
| $1.01M | ﹤0.01% |
2,667
+1,677
| +169% | +$556K |
|
2760
iShares Core MSCI Emerging Markets ETF
IEMG
$163B
| $1.01M | ﹤0.01% |
12,241
+7,401
| +153% | +$590K |
|
|
INTW
2761
GraniteShares 2x Long INTC Daily ETF
INTW
$413M
| $1.01M | ﹤0.01% |
19,993
+18,897
| +1,724% | +$586K |
|
2762
CALL
PROG Holdings
PRG
$1.3B
| $1.01M | ﹤0.01% |
21,700
+13,700
| +171% | +$478K |
|
|
TTAN
2763
PUT
ServiceTitan Inc
TTAN
$5.6B
| $1.01M | ﹤0.01% |
14,300
-8,600
| -38% | -$554K |
|
|
BETA
2764
CALL
Beta Technologies Inc
BETA
$5.58B
| $1.01M | ﹤0.01% |
60,300
+55,900
| +1,270% | +$931K |
|
2765
CALL
Masco
MAS
$13.6B
| $1.01M | ﹤0.01% |
12,400
-3,500
| -22% | -$244K |
|
2766
SL Green Realty
SLG
$3.61B
| $1.01M | ﹤0.01% |
19,482
+11,931
| +158% | +$532K |
|
2767
CALL
MSCI
MSCI
$40.1B
| $1.01M | ﹤0.01% |
1,800
+1,300
| +260% | +$759K |
|
2768
PUT
Thor Industries
THO
$3.72B
| $1.01M | ﹤0.01% |
13,400
+10,500
| +362% | +$808K |
|
2769
CALL
Kopin
KOPN
$928M
| $1M | ﹤0.01% |
224,200
-94,500
| -30% | -$412K |
|
2770
CALL
Everspin Technologies
MRAM
$450M
| $1M | ﹤0.01% |
41,500
+35,200
| +559% | +$789K |
|
2771
PUT
Arrowhead Research
ARWR
$9.31B
| $1M | ﹤0.01% |
12,300
-4,400
| -26% | -$325K |
|
2772
Nektar Therapeutics
NKTR
$1.95B
| $1M | ﹤0.01% |
14,357
+8,635
| +151% | +$632K |
|
|
WCN
2773
PUT
Waste Connections
WCN
$39.1B
| $1M | ﹤0.01% |
+6,000
| New | +$950K |
|
|
MESO
2774
CALL
Mesoblast
MESO
$1.96B
| $1,000K | ﹤0.01% |
73,900
-42,600
| -37% | -$633K |
|
2775
PUT
Hasbro
HAS
$12.4B
| $999K | ﹤0.01% |
12,100
+8,300
| +218% | +$747K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.