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 | |
|---|---|---|---|---|---|---|
2451
PUT
Portillo's
PTLO
$315M
| $1.38M | ﹤0.01% |
118,200
-1,900
| -2% | -$21.9K |
|
2452
CALL
Weyerhaeuser
WY
$17.3B
| $1.38M | ﹤0.01% |
53,600
-12,500
| -19% | -$327K |
|
2453
PUT
Arvinas
ARVN
$518M
| $1.37M | ﹤0.01% |
186,700
-15,300
| -8% | -$113K |
|
|
SPR
2454
PUT
DELISTED
Spirit AeroSystems
SPR
| $1.37M | ﹤0.01% |
36,000
-200
| -0.6% | -$7.19K |
|
2455
Rithm Capital
RITM
$5.09B
| $1.37M | ﹤0.01% |
121,541
+89,573
| +280% | +$987K |
|
2456
Par Pacific Holdings
PARR
$3.88B
| $1.37M | ﹤0.01% |
51,702
+50,347
| +3,716% | +$959K |
|
2457
Cooper-Standard Automotive
CPS
$504M
| $1.37M | ﹤0.01% |
63,705
+11,582
| +22% | +$223K |
|
2458
CALL
CubeSmart
CUBE
$9.53B
| $1.37M | ﹤0.01% |
32,200
-6,200
| -16% | -$257K |
|
2459
CALL
MINISO
MNSO
$3.64B
| $1.37M | ﹤0.01% |
75,100
+27,900
| +59% | +$501K |
|
2460
PUT
Ionis Pharmaceuticals
IONS
$9.35B
| $1.37M | ﹤0.01% |
34,600
-3,900
| -10% | -$128K |
|
2461
PUT
PBF Energy
PBF
$7.29B
| $1.37M | ﹤0.01% |
63,100
+47,100
| +294% | +$895K |
|
2462
CALL
Forward Air
FWRD
$482M
| $1.37M | ﹤0.01% |
55,700
+21,500
| +63% | +$382K |
|
2463
Synopsys
SNPS
$71.5B
| $1.36M | ﹤0.01% |
+2,662
| New | +$1.24M |
|
2464
PUT
Equinox Gold
EQX
$7.32B
| $1.36M | ﹤0.01% |
237,100
+156,700
| +195% | +$1.02M |
|
2465
CALL
Fidelity National Financial
FNF
$13.9B
| $1.36M | ﹤0.01% |
24,300
+10,700
| +79% | +$626K |
|
2466
Novavax
NVAX
$1.23B
| $1.36M | ﹤0.01% |
216,099
+82,552
| +62% | +$547K |
|
2467
CALL
XP
XP
$8.62B
| $1.36M | ﹤0.01% |
67,300
-10,700
| -14% | -$185K |
|
2468
AutoZone
AZO
$48.3B
| $1.36M | ﹤0.01% |
+366
| New | +$1.35M |
|
2469
CALL
Carpenter Technology
CRS
$30B
| $1.35M | ﹤0.01% |
4,900
-59,300
| -92% | -$12.9M |
|
|
NUVL
2470
DELISTED
Nuvalent
NUVL
| $1.35M | ﹤0.01% |
+17,730
| New | +$1.3M |
|
2471
PUT
Bumble
BMBL
$367M
| $1.35M | ﹤0.01% |
205,100
-67,700
| -25% | -$342K |
|
2472
CALL
Domino's
DPZ
$11B
| $1.35M | ﹤0.01% |
3,000
-4,500
| -60% | -$2.11M |
|
|
MRUS
2473
PUT
DELISTED
Merus
MRUS
| $1.35M | ﹤0.01% |
25,700
+25,100
| +4,183% | +$1.18M |
|
2474
abrdn Physical Palladium Shares ETF
PALL
$603M
| $1.35M | ﹤0.01% |
67,105
+52,545
| +361% | +$949K |
|
2475
PUT
TE Connectivity
TEL
$58.8B
| $1.35M | ﹤0.01% |
8,000
-10,600
| -57% | -$1.61M |
|
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.