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 | |
|---|---|---|---|---|---|---|
1551
PUT
Axsome Therapeutics
AXSM
$12.4B
| $3.92M | ﹤0.01% |
37,600
+16,500
| +78% | +$1.75M |
|
1552
PUT
Plains All American Pipeline
PAA
$17.4B
| $3.92M | ﹤0.01% |
214,200
+70,700
| +49% | +$1.23M |
|
1553
CALL
BioNTech
BNTX
$22.6B
| $3.92M | ﹤0.01% |
36,800
-17,600
| -32% | -$1.78M |
|
1554
PUT
Navitas Semiconductor
NVTS
$2.66B
| $3.92M | ﹤0.01% |
597,900
+561,000
| +1,520% | +$2.16M |
|
1555
CALL
BlackBerry
BB
$5.01B
| $3.91M | ﹤0.01% |
854,200
-295,600
| -26% | -$1.12M |
|
1556
AGNC Investment
AGNC
$12.3B
| $3.91M | ﹤0.01% |
425,645
-98,762
| -19% | -$884K |
|
1557
CALL
Magna International
MGA
$17.9B
| $3.91M | ﹤0.01% |
101,200
-35,700
| -26% | -$1.26M |
|
1558
Sanmina
SANM
$11.2B
| $3.9M | ﹤0.01% |
+39,845
| New | +$3.29M |
|
1559
PUT
Equifax
EFX
$20.3B
| $3.89M | ﹤0.01% |
15,000
+8,900
| +146% | +$2.26M |
|
1560
PUT
Brookfield
BN
$102B
| $3.88M | ﹤0.01% |
94,200
+64,350
| +216% | +$2.38M |
|
1561
PUT
Diageo
DEO
$46.2B
| $3.88M | ﹤0.01% |
38,500
-6,500
| -14% | -$705K |
|
1562
PUT
Banc of California
BANC
$3.28B
| $3.88M | ﹤0.01% |
275,900
+900
| +0.3% | +$12.3K |
|
1563
PUT
TMC The Metals Company
TMC
$1.59B
| $3.86M | ﹤0.01% |
585,600
+506,700
| +642% | +$1.94M |
|
1564
Pitney Bowes
PBI
$2.42B
| $3.85M | ﹤0.01% |
353,127
+171,309
| +94% | +$1.61M |
|
1565
CALL
JB Hunt Transport Services
JBHT
$27.1B
| $3.85M | ﹤0.01% |
26,800
+20,700
| +339% | +$2.86M |
|
|
CEP
1566
PUT
DELISTED
Cantor Equity Partners
CEP
| $3.85M | ﹤0.01% |
+138,500
| New | +$4.23M |
|
1567
PUT
Biogen
BIIB
$29.9B
| $3.84M | ﹤0.01% |
30,600
-77,200
| -72% | -$9.62M |
|
1568
CALL
Darling Ingredients
DAR
$9.93B
| $3.84M | ﹤0.01% |
101,300
+49,300
| +95% | +$1.62M |
|
1569
CALL
PVH
PVH
$3.71B
| $3.84M | ﹤0.01% |
56,000
+42,200
| +306% | +$3.06M |
|
1570
PUT
Under Armour Class C
UA
$2.92B
| $3.83M | ﹤0.01% |
560,800
+51,300
| +10% | +$303K |
|
|
VG
1571
PUT
Venture Global Inc
VG
$35.6B
| $3.82M | ﹤0.01% |
245,500
+125,400
| +104% | +$1.45M |
|
1572
PUT
TPG
TPG
$6.87B
| $3.82M | ﹤0.01% |
72,800
-6,500
| -8% | -$312K |
|
|
FITB
1573
PUT
Fifth Third Bancorp
FITB
$52B
| $3.81M | ﹤0.01% |
92,700
-15,100
| -14% | -$567K |
|
1574
PUT
RUM Group Inc
RUM
$1.57B
| $3.8M | ﹤0.01% |
423,600
-21,200
| -5% | -$181K |
|
1575
PUT
Nutanix
NTNX
$14.9B
| $3.8M | ﹤0.01% |
49,700
-32,900
| -40% | -$2.37M |
|
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.