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 | |
|---|---|---|---|---|---|---|
|
TXNM
3651
PUT
TXNM Energy Inc
TXNM
$6.43B
| $433K | ﹤0.01% |
7,700
+5,200
| +208% | +$283K |
|
3652
PUT
Leonardo DRS
DRS
$13.1B
| $432K | ﹤0.01% |
9,300
+3,700
| +66% | +$149K |
|
3653
CALL
ThredUp
TDUP
$760M
| $432K | ﹤0.01% |
57,800
-102,400
| -64% | -$602K |
|
3654
PUT
Porch Group
PRCH
$1.38B
| $431K | ﹤0.01% |
36,600
+35,100
| +2,340% | +$302K |
|
3655
CALL
Vivid Seats
SEAT
$88.7M
| $431K | ﹤0.01% |
12,765
+12,710
| +23,109% | +$544K |
|
3656
CALL
Zebra Technologies
ZBRA
$13.5B
| $431K | ﹤0.01% |
1,400
-4,500
| -76% | -$1.22M |
|
3657
CALL
Pinnacle Financial Partners Inc
PNFP
$15.9B
| $430K | ﹤0.01% |
3,900
+700
| +22% | +$72.2K |
|
3658
PUT
Fortuna Silver Mines
FSM
$2.55B
| $429K | ﹤0.01% |
65,600
+37,600
| +134% | +$233K |
|
|
FYBR
3659
CALL
DELISTED
Frontier Communications
FYBR
| $429K | ﹤0.01% |
11,800
| – | – |
|
3660
PUT
Dorian LPG
LPG
$1.9B
| $429K | ﹤0.01% |
17,600
-5,200
| -23% | -$115K |
|
3661
CALL
Vanguard Total International Stock ETF
VXUS
$153B
| $428K | ﹤0.01% |
6,200
+2,600
| +72% | +$169K |
|
3662
CALL
Extra Space Storage
EXR
$32.2B
| $427K | ﹤0.01% |
2,900
-900
| -24% | -$131K |
|
3663
CALL
O-I Glass
OI
$1.39B
| $427K | ﹤0.01% |
29,000
+4,500
| +18% | +$57.5K |
|
3664
CALL
Rayonier Advanced Materials
RYAM
$591M
| $427K | ﹤0.01% |
111,000
+103,000
| +1,288% | +$433K |
|
3665
CALL
Syndax Pharmaceuticals
SNDX
$1.74B
| $427K | ﹤0.01% |
45,600
-19,400
| -30% | -$214K |
|
3666
PUT
VICI Properties
VICI
$29.8B
| $427K | ﹤0.01% |
13,100
-13,600
| -51% | -$433K |
|
3667
Capri Holdings
CPRI
$1.88B
| $426K | ﹤0.01% |
24,088
-136,920
| -85% | -$2.26M |
|
3668
CALL
DoubleVerify
DV
$1.73B
| $426K | ﹤0.01% |
28,500
-7,300
| -20% | -$100K |
|
3669
CALL
DXC Technology
DXC
$1.76B
| $426K | ﹤0.01% |
27,900
-120,900
| -81% | -$1.86M |
|
3670
CALL
HEICO Corp Class A
HEI.A
$36.8B
| $426K | ﹤0.01% |
1,300
-3,700
| -74% | -$810K |
|
3671
CALL
Jackson Financial
JXN
$8.57B
| $426K | ﹤0.01% |
4,800
-16,800
| -78% | -$1.36M |
|
3672
PUT
OGE Energy
OGE
$10.2B
| $426K | ﹤0.01% |
9,600
-14,600
| -60% | -$648K |
|
3673
PUT
Phreesia
PHR
$671M
| $426K | ﹤0.01% |
15,000
+10,000
| +200% | +$254K |
|
3674
CALL
Absci
ABSI
$1.21B
| $425K | ﹤0.01% |
165,400
+72,200
| +77% | +$203K |
|
3675
PUT
Atour Lifestyle Holdings
ATAT
$4.77B
| $425K | ﹤0.01% |
13,100
-14,300
| -52% | -$406K |
|
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.