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 | |
|---|---|---|---|---|---|---|
4526
CryoPort
CYRX
$753M
| $195K | ﹤0.01% |
26,254
+22,811
| +663% | +$142K |
|
|
DX
4527
CALL
Dynex Capital
DX
$3.17B
| $195K | ﹤0.01% |
16,000
+5,100
| +47% | +$61.9K |
|
|
FPI
4528
CALL
Farmland Partners
FPI
$415M
| $195K | ﹤0.01% |
17,000
+200
| +1% | +$2.14K |
|
4529
Petrobras
PBR
$120B
| $195K | ﹤0.01% |
15,660
-468,283
| -97% | -$5.61M |
|
4530
iShares 10-20 Year Treasury Bond ETF
TLH
$11B
| $195K | ﹤0.01% |
+1,922
| New | +$193K |
|
4531
VEON
VEON
$3.5B
| $195K | ﹤0.01% |
4,247
-384
| -8% | -$17.7K |
|
4532
CALL
Alcon
ALC
$34B
| $194K | ﹤0.01% |
2,200
-18,200
| -89% | -$1.63M |
|
4533
CALL
Broadridge
BR
$18.4B
| $194K | ﹤0.01% |
800
-1,200
| -60% | -$285K |
|
|
OBE
4534
CALL
Obsidian Energy
OBE
$656M
| $194K | ﹤0.01% |
35,100
-24,900
| -42% | -$123K |
|
4535
PUT
Piper Sandler
PIPR
$4.99B
| $194K | ﹤0.01% |
2,800
+2,000
| +250% | +$125K |
|
4536
PUT
Champion Homes
SKY
$4.41B
| $194K | ﹤0.01% |
+3,100
| New | +$241K |
|
4537
Tandem Diabetes Care
TNDM
$1.27B
| $194K | ﹤0.01% |
10,434
+8,931
| +594% | +$177K |
|
4538
CALL
VanEck Energy Income ETF
EINC
$77.6M
| $193K | ﹤0.01% |
5,000
+1,500
| +43% | +$143K |
|
4539
CALL
Future Fuel
FF
$205M
| $193K | ﹤0.01% |
49,900
+40,700
| +442% | +$164K |
|
4540
Geron
GERN
$898M
| $193K | ﹤0.01% |
137,408
-52,613
| -28% | -$74.6K |
|
4541
Lear
LEA
$7.39B
| $193K | ﹤0.01% |
+2,040
| New | +$179K |
|
4542
CALL
ManpowerGroup
MAN
$2.6B
| $193K | ﹤0.01% |
4,800
+3,200
| +200% | +$140K |
|
4543
Precigen
PGEN
$1.94B
| $193K | ﹤0.01% |
136,232
+105,814
| +348% | +$150K |
|
4544
PUT
Vishay Intertechnology
VSH
$4.6B
| $193K | ﹤0.01% |
12,200
-2,100
| -15% | -$29.2K |
|
4545
PUT
Ameresco
AMRC
$980M
| $192K | ﹤0.01% |
12,700
+3,700
| +41% | +$48.4K |
|
4546
CONMED
CNMD
$1.3B
| $192K | ﹤0.01% |
3,687
-3,278
| -47% | -$180K |
|
4547
CALL
FingerMotion
FNGR
$14.8M
| $192K | ﹤0.01% |
94,700
+73,200
| +340% | +$180K |
|
|
MTLS
4548
CALL
Materialise
MTLS
$366M
| $192K | ﹤0.01% |
34,000
-1,100
| -3% | -$5.68K |
|
4549
CALL
RBC Bearings
RBC
$17.4B
| $192K | ﹤0.01% |
500
| – | – |
|
4550
Shoals Technologies Group
SHLS
$1.33B
| $192K | ﹤0.01% |
45,360
+33,059
| +269% | +$144K |
|
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.