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 | |
|---|---|---|---|---|---|---|
4901
MBIA
MBI
$219M
| $171K | ﹤0.01% |
26,241
-2,316
| -8% | -$14K |
|
|
VGMS
4902
PUT
Vanguard Multi-Sector Income Bond ETF
VGMS
$266M
| $171K | ﹤0.01% |
+3,400
| New | +$174K |
|
4903
PUT
SEALSQ Corp
LAES
$522M
| $171K | ﹤0.01% |
54,200
-41,500
| -43% | -$124K |
|
|
GPGI
4904
GPGI Inc
GPGI
$3.41B
| $171K | ﹤0.01% |
+10,763
| New | +$154K |
|
4905
CALL
Primerica
PRI
$8.49B
| $171K | ﹤0.01% |
600
+100
| +20% | +$27.4K |
|
4906
PUT
Global X S&P 500 Covered Call ETF
XYLD
$3.39B
| $170K | ﹤0.01% |
4,200
+2,600
| +163% | +$105K |
|
4907
PUT
Coca-Cola Femsa
KOF
$22.8B
| $170K | ﹤0.01% |
+1,600
| New | +$168K |
|
4908
Genco Shipping & Trading
GNK
$1.13B
| $170K | ﹤0.01% |
6,856
-7,777
| -53% | -$188K |
|
4909
PUT
iShares Convertible Bond ETF
ICVT
$8.04B
| $170K | ﹤0.01% |
5,600
-82,700
| -94% | -$9.58M |
|
4910
CALL
Moog Inc Class A
MOG.A
$12.3B
| $170K | ﹤0.01% |
400
+200
| +100% | +$68.3K |
|
4911
Portillo's
PTLO
$257M
| $169K | ﹤0.01% |
35,758
-70,590
| -66% | -$342K |
|
|
IPX
4912
PUT
IperionX
IPX
$663M
| $169K | ﹤0.01% |
+5,700
| New | +$194K |
|
4913
iShares Mortgage Real Estate ETF
REM
$467M
| $169K | ﹤0.01% |
+7,679
| New | +$170K |
|
4914
SM Energy
SM
$7.88B
| $169K | ﹤0.01% |
6,484
-3,484
| -35% | -$105K |
|
4915
PUT
Graphic Packaging
GPK
$2.73B
| $169K | ﹤0.01% |
16,000
-15,400
| -49% | -$157K |
|
4916
PUT
Black Stone Minerals
BSM
$3.04B
| $169K | ﹤0.01% |
12,100
+11,600
| +2,320% | +$161K |
|
|
LTC
4917
LTC Properties
LTC
$2.32B
| $169K | ﹤0.01% |
+4,395
| New | +$167K |
|
|
AMRN
4918
CALL
Amarin Corp
AMRN
$278M
| $169K | ﹤0.01% |
10,600
+7,600
| +253% | +$112K |
|
4919
Lincoln Educational Services
LINC
$683M
| $169K | ﹤0.01% |
+3,382
| New | +$153K |
|
4920
SBA Communications
SBAC
$17.3B
| $169K | ﹤0.01% |
955
-5,792
| -86% | -$1.19M |
|
4921
CALL
TFS Financial
TFSL
$4.57B
| $168K | ﹤0.01% |
9,500
+5,500
| +138% | +$85.8K |
|
4922
CALL
Euronet Worldwide
EEFT
$2.38B
| $168K | ﹤0.01% |
2,300
+300
| +15% | +$20.9K |
|
4923
CALL
AMN Healthcare
AMN
$1.35B
| $168K | ﹤0.01% |
5,200
-28,800
| -85% | -$743K |
|
|
SAIL
4924
SailPoint Inc
SAIL
$11.8B
| $168K | ﹤0.01% |
11,496
+4,575
| +66% | +$62.3K |
|
4925
Dorian LPG
LPG
$2.32B
| $168K | ﹤0.01% |
4,839
-3,062
| -39% | -$121K |
|
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.