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 | |
|---|---|---|---|---|---|---|
|
SPTN
4026
CALL
DELISTED
SpartanNash
SPTN
| $312K | ﹤0.01% |
11,800
+4,000
| +51% | +$80K |
|
4027
CALL
Domo
DOMO
$177M
| $311K | ﹤0.01% |
22,300
-39,500
| -64% | -$397K |
|
4028
Manitowoc
MTW
$527M
| $311K | ﹤0.01% |
25,880
+25,715
| +15,585% | +$252K |
|
4029
CALL
Federal Agricultural Mortgage Class A
AGM.A
$1.62B
| $310K | ﹤0.01% |
1,600
+500
| +45% | +$67.1K |
|
4030
PUT
Prospect Capital
PSEC
$1.12B
| $310K | ﹤0.01% |
97,700
+58,100
| +147% | +$202K |
|
4031
Steven Madden
SHOO
$3.22B
| $310K | ﹤0.01% |
12,963
+10,696
| +472% | +$251K |
|
4032
Ormat Technologies
ORA
$6.05B
| $309K | ﹤0.01% |
3,698
+2,827
| +325% | +$211K |
|
4033
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5.08B
| $309K | ﹤0.01% |
3,491
+3,361
| +2,585% | +$281K |
|
4034
PUT
Stem
STEM
$47.7M
| $309K | ﹤0.01% |
49,600
+49,095
| +9,722% | +$440K |
|
4035
CALL
Silicon Motion
SIMO
$7.51B
| $308K | ﹤0.01% |
4,100
-28,500
| -87% | -$1.62M |
|
|
SJT
4036
CALL
San Juan Basin Royalty Trust
SJT
$117M
| $308K | ﹤0.01% |
51,600
+39,000
| +310% | +$237K |
|
4037
Simplify Short Term Treasury Futures Strategy ETF
TUA
$696M
| $308K | ﹤0.01% |
14,020
+7,967
| +132% | +$175K |
|
4038
UWM Holdings
UWMC
$631M
| $308K | ﹤0.01% |
74,504
+19,909
| +36% | +$87.5K |
|
4039
CALL
Associated Banc-Corp
ASB
$5.86B
| $307K | ﹤0.01% |
12,600
-41,300
| -77% | -$931K |
|
4040
PRA Group
PRAA
$688M
| $307K | ﹤0.01% |
20,821
+19,905
| +2,173% | +$317K |
|
4041
PUT
Unusual Machines
UMAC
$952M
| $307K | ﹤0.01% |
35,900
+34,500
| +2,464% | +$217K |
|
4042
Axalta
AXTA
$7.58B
| $306K | ﹤0.01% |
10,328
-7,319
| -41% | -$228K |
|
4043
Freshpet
FRPT
$3.01B
| $306K | ﹤0.01% |
4,508
+473
| +12% | +$36.9K |
|
4044
G-III Apparel Group
GIII
$1.55B
| $306K | ﹤0.01% |
+13,695
| New | +$345K |
|
4045
Seadrill
SDRL
$2.56B
| $306K | ﹤0.01% |
+11,669
| New | +$275K |
|
4046
O-I Glass
OI
$1.39B
| $305K | ﹤0.01% |
20,750
+6,568
| +46% | +$84K |
|
4047
CALL
Procept Biorobotics
PRCT
$1.03B
| $305K | ﹤0.01% |
5,300
-3,100
| -37% | -$175K |
|
|
4048
CALL
Prospect Capital
PSEC
$1.12B
| $305K | ﹤0.01% |
96,200
+33,000
| +52% | +$115K |
|
4049
PUT
BBB Foods
TBBB
$4.81B
| $305K | ﹤0.01% |
11,000
-100
| -0.9% | -$2.81K |
|
4050
CALL
Acadia Pharmaceuticals
ACAD
$4.45B
| $304K | ﹤0.01% |
14,100
-20,000
| -59% | -$372K |
|
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.