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 | |
|---|---|---|---|---|---|---|
4476
CALL
Sturm, Ruger & Co
RGR
$674M
| $242K | ﹤0.01% |
6,400
+4,100
| +178% | +$165K |
|
4477
CALL
Phathom Pharmaceuticals
PHAT
$597M
| $242K | ﹤0.01% |
22,300
-83,900
| -79% | -$957K |
|
4478
NRG Energy
NRG
$20.5B
| $242K | ﹤0.01% |
+1,656
| New | +$238K |
|
4479
CALL
ING
ING
$103B
| $242K | ﹤0.01% |
7,700
-31,400
| -80% | -$929K |
|
|
AEVA
4480
PUT
Aeva Technologies
AEVA
$979M
| $241K | ﹤0.01% |
8,400
-7,500
| -47% | -$148K |
|
4481
Newmark Group
NMRK
$2.26B
| $241K | ﹤0.01% |
15,960
+2,439
| +18% | +$37.2K |
|
4482
CALL
Valens Semiconductor
VLN
$198M
| $241K | ﹤0.01% |
106,700
+59,500
| +126% | +$133K |
|
|
BTQ
4483
CALL
BTQ Technologies Corp
BTQ
$419M
| $240K | ﹤0.01% |
44,500
+9,700
| +28% | +$36.2K |
|
4484
PUT
SouthState Bank Corp
SSB
$9.72B
| $240K | ﹤0.01% |
2,400
-8,300
| -78% | -$800K |
|
4485
CALL
Veru
VERU
$43.5M
| $239K | ﹤0.01% |
76,500
+73,900
| +2,842% | +$188K |
|
|
MFA
4486
CALL
MFA Financial
MFA
$811M
| $239K | ﹤0.01% |
24,700
-4,100
| -14% | -$39.8K |
|
4487
PUT
Fortuna Silver Mines
FSM
$3.35B
| $239K | ﹤0.01% |
28,300
+2,000
| +8% | +$19.4K |
|
|
CAI
4488
Caris Life Sciences
CAI
$8.83B
| $239K | ﹤0.01% |
13,409
+10,740
| +402% | +$192K |
|
|
TGEN
4489
PUT
Tecogen Inc
TGEN
$91.8M
| $239K | ﹤0.01% |
45,700
+7,100
| +18% | +$35.6K |
|
4490
Garrett Motion
GTX
$4.87B
| $239K | ﹤0.01% |
6,584
+1,206
| +22% | +$33.6K |
|
4491
CALL
Qiagen
QGEN
$9.19B
| $239K | ﹤0.01% |
6,100
-16,300
| -73% | -$605K |
|
4492
CALL
Glaukos
GKOS
$9.35B
| $238K | ﹤0.01% |
1,700
+1,200
| +240% | +$152K |
|
4493
Teucrium Agricultural Fund
TAGS
$21.7M
| $236K | ﹤0.01% |
9,915
+6,340
| +177% | +$156K |
|
4494
CALL
Trinity Capital Inc
TRIN
$1.68B
| $236K | ﹤0.01% |
13,200
-17,300
| -57% | -$285K |
|
|
WAY
4495
PUT
Waystar Holding Corp
WAY
$4.81B
| $236K | ﹤0.01% |
11,500
+600
| +6% | +$12.6K |
|
4496
PUT
Atomera
ATOM
$164M
| $236K | ﹤0.01% |
27,100
+22,700
| +516% | +$178K |
|
4497
HighPeak Energy
HPK
$976M
| $236K | ﹤0.01% |
+33,762
| New | +$233K |
|
4498
CALL
Louisiana-Pacific
LPX
$4.6B
| $236K | ﹤0.01% |
3,000
+2,600
| +650% | +$192K |
|
|
NAVN
4499
PUT
Navan Inc
NAVN
$5.35B
| $236K | ﹤0.01% |
10,300
-14,900
| -59% | -$273K |
|
4500
Karyopharm Therapeutics
KPTI
$28.1M
| $235K | ﹤0.01% |
+24,086
| New | +$209K |
|
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.