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 | |
|---|---|---|---|---|---|---|
6701
PUT
Sprott Junior Gold Miners ETF
SGDJ
$274M
| $22K | ﹤0.01% |
500
| – | – |
|
6702
CALL
Shinhan Financial Group
SHG
$32.8B
| $22K | ﹤0.01% |
+500
| New | +$19K |
|
6703
PUT
SLR Investment Corp
SLRC
$708M
| $22K | ﹤0.01% |
1,400
+100
| +8% | +$1.6K |
|
6704
PUT
Sensus Healthcare
SRTS
$48.4M
| $22K | ﹤0.01% |
4,700
+2,600
| +124% | +$12.2K |
|
6705
PUT
StepStone Group
STEP
$3.67B
| $22K | ﹤0.01% |
+400
| New | +$21.4K |
|
|
THRD
6706
CALL
DELISTED
Third Harmonic Bio
THRD
| $22K | ﹤0.01% |
4,200
-800
| -16% | -$3.99K |
|
6707
PUT
TriplePoint Venture Growth BDC
TPVG
$185M
| $22K | ﹤0.01% |
3,200
-1,800
| -36% | -$11.8K |
|
6708
PUT
United States Antimony
UAMY
$772M
| $22K | ﹤0.01% |
10,200
-36,800
| -78% | -$104K |
|
6709
U-Haul Holding Co Series N
UHAL.B
$12.6B
| $22K | ﹤0.01% |
423
+105
| +33% | +$5.86K |
|
6710
Village Farms International
VFF
$250M
| $22K | ﹤0.01% |
20,280
+19,654
| +3,140% | +$17.4K |
|
6711
PUT
Vor Biopharma
VOR
$1.08B
| $22K | ﹤0.01% |
680
+565
| +491% | +$4.99K |
|
6712
PUT
WD-40
WDFC
$3.08B
| $22K | ﹤0.01% |
100
-100
| -50% | -$23.5K |
|
6713
Wipro
WIT
$19B
| $22K | ﹤0.01% |
+7,293
| New | +$21.2K |
|
6714
CALL
Advanced Drainage Systems
WMS
$11.1B
| $22K | ﹤0.01% |
200
-5,200
| -96% | -$582K |
|
6715
Invesco S&P MidCap Momentum ETF
XMMO
$7.15B
| $22K | ﹤0.01% |
178
+68
| +62% | +$8.13K |
|
6716
PUT
Dentsply Sirona
XRAY
$2.7B
| $22K | ﹤0.01% |
1,400
-100
| -7% | -$1.5K |
|
6717
Xylem
XYL
$29.2B
| $22K | ﹤0.01% |
177
-608
| -77% | -$73.6K |
|
|
GMEU
6718
PUT
T-REX 2X Long GME Daily Target ETF
GMEU
$21.7M
| $22K | ﹤0.01% |
+1,000
| New | +$23.9K |
|
|
CAI
6719
Caris Life Sciences
CAI
$4.41B
| $22K | ﹤0.01% |
+832
| New | +$22.4K |
|
6720
CALL
DT Midstream
DTM
$14.1B
| $21K | ﹤0.01% |
200
-9,400
| -98% | -$952K |
|
6721
PUT
Vaalco Energy
EGY
$540M
| $21K | ﹤0.01% |
5,900
+4,500
| +321% | +$15.6K |
|
6722
Flotek Industries
FTK
$856M
| $21K | ﹤0.01% |
1,464
-231
| -14% | -$2.66K |
|
6723
PUT
Heron Therapeutics
HRTX
$92M
| $21K | ﹤0.01% |
10,600
-9,200
| -46% | -$18.8K |
|
6724
Hyperfine
HYPR
$90.9M
| $21K | ﹤0.01% |
29,312
+29,090
| +13,104% | +$20.4K |
|
|
LADR
6725
CALL
Ladder Capital
LADR
$1.25B
| $21K | ﹤0.01% |
2,000
-800
| -29% | -$8.4K |
|
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.