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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3451
PUT
Cullen/Frost Bankers
CFR
$10.3B
| $527K | ﹤0.01% |
4,100
-4,500
| -52% | -$550K |
|
3452
CALL
Omega Healthcare
OHI
$15.3B
| $527K | ﹤0.01% |
14,400
-12,400
| -46% | -$460K |
|
3453
PUT
Philips
PHG
$24.3B
| $527K | ﹤0.01% |
22,817
-40,962
| -64% | -$918K |
|
|
LTC
3454
PUT
LTC Properties
LTC
$2.15B
| $526K | ﹤0.01% |
15,200
+600
| +4% | +$21.1K |
|
3455
RLX Technology
RLX
$2.49B
| $526K | ﹤0.01% |
238,373
+129,692
| +119% | +$254K |
|
3456
CALL
Universal Technical Institute
UTI
$2.12B
| $525K | ﹤0.01% |
15,500
-3,700
| -19% | -$116K |
|
3457
PUT
EVgo
EVGO
$220M
| $523K | ﹤0.01% |
143,300
+40,900
| +40% | +$140K |
|
3458
Invesco S&P 500 Low Volatility ETF
SPLV
$7.21B
| $523K | ﹤0.01% |
7,184
-15,906
| -69% | -$1.15M |
|
|
KEEL
3459
PUT
Keel Infrastructure Corp
KEEL
$2.45B
| $522K | ﹤0.01% |
621,700
+314,800
| +103% | +$291K |
|
3460
CALL
Vanguard Total Bond Market
BND
$158B
| $522K | ﹤0.01% |
7,100
-3,300
| -32% | -$240K |
|
3461
PUT
United States Copper Index Fund
CPER
$750M
| $522K | ﹤0.01% |
16,500
+11,500
| +230% | +$341K |
|
3462
Protagonist Therapeutics
PTGX
$8.72B
| $522K | ﹤0.01% |
9,452
-16,482
| -64% | -$791K |
|
3463
CALL
Kosmos Energy
KOS
$1.45B
| $521K | ﹤0.01% |
303,300
+181,100
| +148% | +$328K |
|
|
SA
3464
PUT
Seabridge Gold
SA
$2.82B
| $521K | ﹤0.01% |
35,900
+11,700
| +48% | +$149K |
|
3465
PUT
Xerox
XRX
$357M
| $521K | ﹤0.01% |
98,900
-95,000
| -49% | -$464K |
|
3466
PUT
Green Plains
GPRE
$1.15B
| $520K | ﹤0.01% |
86,400
+60,400
| +232% | +$266K |
|
3467
CALL
ODDITY Tech
ODD
$758M
| $520K | ﹤0.01% |
6,900
-10,100
| -59% | -$616K |
|
3468
PUT
OppFi
OPFI
$804M
| $520K | ﹤0.01% |
37,200
-217,900
| -85% | -$2.45M |
|
3469
Groupon
GRPN
$1.05B
| $519K | ﹤0.01% |
15,529
-69,459
| -82% | -$1.77M |
|
3470
Huntington Ingalls Industries
HII
$11.4B
| $519K | ﹤0.01% |
+2,153
| New | +$481K |
|
3471
CALL
NatWest
NWG
$72.8B
| $519K | ﹤0.01% |
36,700
+19,700
| +116% | +$260K |
|
3472
Oportun Financial
OPRT
$262M
| $519K | ﹤0.01% |
72,558
+62,254
| +604% | +$373K |
|
3473
PUT
AllianceBernstein
AB
$3.54B
| $518K | ﹤0.01% |
12,700
-1,600
| -11% | -$62.7K |
|
3474
CALL
LivePerson
LPSN
$20.8M
| $518K | ﹤0.01% |
34,253
-5,007
| -13% | -$59.2K |
|
3475
CALL
Revolution Medicines
RVMD
$40B
| $518K | ﹤0.01% |
14,100
+6,500
| +86% | +$250K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.