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 | |
|---|---|---|---|---|---|---|
2676
PUT
Ultragenyx Pharmaceutical
RARE
$1.43B
| $1.1M | ﹤0.01% |
33,000
+23,600
| +251% | +$586K |
|
2677
PUT
Klaviyo
KVYO
$4.5B
| $1.1M | ﹤0.01% |
72,900
+47,100
| +183% | +$781K |
|
2678
CALL
JB Hunt Transport Services
JBHT
$21.2B
| $1.1M | ﹤0.01% |
3,800
+2,000
| +111% | +$514K |
|
2679
CALL
Columbia Banking Systems
COLB
$8.39B
| $1.1M | ﹤0.01% |
34,300
+23,900
| +230% | +$710K |
|
2680
CALL
Tyson Foods
TSN
$17.9B
| $1.1M | ﹤0.01% |
19,200
+8,000
| +71% | +$501K |
|
|
LINE
2681
CALL
Lineage Inc
LINE
$8.23B
| $1.1M | ﹤0.01% |
25,400
-20,800
| -45% | -$818K |
|
2682
CALL
ADT
ADT
$4.68B
| $1.1M | ﹤0.01% |
168,700
+125,600
| +291% | +$861K |
|
2683
PUT
Travere Therapeutics
TVTX
$5.6B
| $1.1M | ﹤0.01% |
19,300
-39,900
| -67% | -$1.77M |
|
2684
PUT
KBR
KBR
$4.35B
| $1.09M | ﹤0.01% |
31,700
+31,600
| +31,600% | +$1.1M |
|
2685
PUT
DuPont de Nemours
DD
$17.8B
| $1.09M | ﹤0.01% |
14,800
+3,200
| +28% | +$454K |
|
|
TIGR
2686
PUT
UP Fintech Holding
TIGR
$834M
| $1.09M | ﹤0.01% |
247,600
+118,500
| +92% | +$691K |
|
2687
CALL
Nurix Therapeutics
NRIX
$2.39B
| $1.09M | ﹤0.01% |
44,900
+41,600
| +1,261% | +$709K |
|
|
STUB
2688
PUT
StubHub Holdings
STUB
$2.08B
| $1.09M | ﹤0.01% |
84,500
-8,000
| -9% | -$70.6K |
|
2689
CALL
AdaptHealth
AHCO
$752M
| $1.09M | ﹤0.01% |
104,300
+91,100
| +690% | +$1.02M |
|
2690
CALL
abrdn Physical Palladium Shares ETF
PALL
$663M
| $1.09M | ﹤0.01% |
49,200
-19,300
| -28% | -$494K |
|
2691
Fabrinet
FN
$15B
| $1.09M | ﹤0.01% |
1,931
-1,435
| -43% | -$925K |
|
2692
CALL
Sky Harbour Group
SKYH
$396M
| $1.08M | ﹤0.01% |
110,200
+98,200
| +818% | +$960K |
|
2693
CALL
Dave & Buster's
PLAY
$231M
| $1.08M | ﹤0.01% |
94,800
+93,300
| +6,220% | +$1.11M |
|
2694
Lattice Semiconductor
LSCC
$18.2B
| $1.08M | ﹤0.01% |
7,055
+3,484
| +98% | +$450K |
|
2695
PUT
Crescent Energy
CRGY
$4.34B
| $1.08M | ﹤0.01% |
109,600
-65,100
| -37% | -$796K |
|
2696
BILL Holdings
BILL
$3.77B
| $1.08M | ﹤0.01% |
+29,742
| New | +$1.1M |
|
2697
PUT
Equinox Gold
EQX
$13.9B
| $1.08M | ﹤0.01% |
110,600
-160,500
| -59% | -$2.07M |
|
2698
CALL
Teradata
TDC
$2.69B
| $1.07M | ﹤0.01% |
31,000
+5,300
| +21% | +$161K |
|
2699
PUT
Kimbell Royalty Partners
KRP
$1.47B
| $1.07M | ﹤0.01% |
73,900
+62,300
| +537% | +$928K |
|
|
XNDU
2700
PUT
Xanadu Quantum Technologies Class B
XNDU
$1.52B
| $1.07M | ﹤0.01% |
+88,600
| New | +$1.46M |
|
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.