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 | |
|---|---|---|---|---|---|---|
|
VIA
4201
CALL
Via Transportation Inc
VIA
$2.35B
| $305K | ﹤0.01% |
+16,800
| New | +$263K |
|
4202
Unum
UNM
$14.2B
| $304K | ﹤0.01% |
+3,403
| New | +$282K |
|
|
MRX
4203
Marex Group Limited Ordinary Shares
MRX
$5.14B
| $304K | ﹤0.01% |
+4,989
| New | +$275K |
|
|
CNR
4204
CALL
Core Natural Resources Inc
CNR
$4.33B
| $304K | ﹤0.01% |
3,800
-1,300
| -25% | -$115K |
|
4205
PUT
Globant
GLOB
$1.44B
| $304K | ﹤0.01% |
10,500
+5,400
| +106% | +$216K |
|
4206
PUT
Globe Life
GL
$12.8B
| $304K | ﹤0.01% |
1,700
+100
| +6% | +$15.7K |
|
4207
PUT
Yum! Brands
YUM
$37.7B
| $304K | ﹤0.01% |
1,900
-3,000
| -61% | -$465K |
|
4208
Blackstone Mortgage Trust
BXMT
$2.1B
| $304K | ﹤0.01% |
+17,911
| New | +$335K |
|
4209
CALL
International General Insurance
IGIC
$1.04B
| $304K | ﹤0.01% |
11,600
+10,400
| +867% | +$265K |
|
4210
CALL
Elbit Systems
ESLT
$32.9B
| $303K | ﹤0.01% |
400
-2,000
| -83% | -$1.66M |
|
4211
CALL
UDR
UDR
$10.9B
| $303K | ﹤0.01% |
7,600
+400
| +6% | +$14.8K |
|
4212
Acacia Research
ACTG
$420M
| $303K | ﹤0.01% |
65,103
+33,148
| +104% | +$159K |
|
4213
CALL
Quantum-Si Incorporated
QSI
$186M
| $303K | ﹤0.01% |
342,500
+59,300
| +21% | +$56.5K |
|
4214
Analog Devices
ADI
$195B
| $303K | ﹤0.01% |
763
-21,188
| -97% | -$8.39M |
|
4215
Navient
NAVI
$832M
| $303K | ﹤0.01% |
35,600
-55,432
| -61% | -$466K |
|
4216
CALL
Vericel Corp
VCEL
$2.05B
| $303K | ﹤0.01% |
6,800
+6,700
| +6,700% | +$241K |
|
|
PMT
4217
CALL
PennyMac Mortgage Investment
PMT
$712M
| $302K | ﹤0.01% |
26,800
+19,800
| +283% | +$218K |
|
4218
PUT
TriCo Bancshares
TCBK
$1.66B
| $302K | ﹤0.01% |
5,600
| – | – |
|
|
NAKA
4219
CALL
Nakamoto Inc
NAKA
$175M
| $301K | ﹤0.01% |
76,300
+68,682
| +902% | +$458K |
|
4220
Xperi
XPER
$267M
| $301K | ﹤0.01% |
36,562
-4,385
| -11% | -$31.7K |
|
4221
PUT
MYR Group
MYRG
$4.52B
| $300K | ﹤0.01% |
600
+300
| +100% | +$123K |
|
4222
PUT
Post Holdings
POST
$3.4B
| $300K | ﹤0.01% |
+3,400
| New | +$331K |
|
|
CGAU
4223
CALL
Centerra Gold
CGAU
$4.31B
| $300K | ﹤0.01% |
18,900
-7,500
| -28% | -$131K |
|
|
BELFB
4224
CALL
Bel Fuse Inc Class B
BELFB
$3.58B
| $300K | ﹤0.01% |
+900
| New | +$243K |
|
4225
Knowles
KN
$3.2B
| $300K | ﹤0.01% |
+7,224
| New | +$251K |
|
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.