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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5376
PUT
Titan Machinery
TITN
$396M
| $140K | ﹤0.01% |
8,400
-85,500
| -91% | -$1.68M |
|
5377
CALL
Usana Health Sciences
USNA
$408M
| $140K | ﹤0.01% |
5,100
+4,400
| +629% | +$135K |
|
5378
PUT
Compass Diversified
CODI
$758M
| $139K | ﹤0.01% |
21,000
-6,400
| -23% | -$44.1K |
|
5379
CALL
Corbus Pharmaceuticals
CRBP
$166M
| $139K | ﹤0.01% |
11,000
+10,800
| +5,400% | +$103K |
|
|
DEA
5380
CALL
Easterly Government Properties
DEA
$1.13B
| $139K | ﹤0.01% |
6,100
-3,700
| -38% | -$84.1K |
|
5381
Getty Images
GETY
$156M
| $139K | ﹤0.01% |
+70,417
| New | +$130K |
|
5382
PUT
Genworth Financial
GNW
$3.76B
| $139K | ﹤0.01% |
15,700
-7,000
| -31% | -$57.8K |
|
5383
PUT
Mid-America Apartment Communities
MAA
$15.4B
| $139K | ﹤0.01% |
1,000
-10,200
| -91% | -$1.47M |
|
5384
PUT
Morningstar
MORN
$7.22B
| $139K | ﹤0.01% |
+600
| New | +$160K |
|
5385
PUT
Northwest Natural Holdings
NWN
$2.06B
| $139K | ﹤0.01% |
3,100
+1,700
| +121% | +$70.5K |
|
5386
CALL
Construction Partners
ROAD
$5.84B
| $139K | ﹤0.01% |
1,100
-1,200
| -52% | -$137K |
|
5387
Regal Rexnord
RRX
$13.7B
| $139K | ﹤0.01% |
973
-541
| -36% | -$79.7K |
|
5388
CALL
Saic
SAIC
$4.95B
| $139K | ﹤0.01% |
1,400
| – | – |
|
5389
PUT
SandRidge Energy
SD
$514M
| $139K | ﹤0.01% |
12,400
+10,900
| +727% | +$120K |
|
5390
PUT
VeriSign
VRSN
$26.2B
| $139K | ﹤0.01% |
500
-31,700
| -98% | -$8.86M |
|
5391
HUB Group
HUBG
$2.85B
| $138K | ﹤0.01% |
4,018
-3,903
| -49% | -$139K |
|
|
MZTI
5392
CALL
The Marzetti Company
MZTI
$2.93B
| $138K | ﹤0.01% |
800
-300
| -27% | -$53.8K |
|
5393
PUT
Stepan Co
SCL
$1.46B
| $138K | ﹤0.01% |
2,900
+2,200
| +314% | +$114K |
|
|
FLD
5394
PUT
Fold Holdings
FLD
$22.9M
| $138K | ﹤0.01% |
+35,800
| New | +$141K |
|
5395
PUT
Brookfield Renewable
BEPC
$6.08B
| $137K | ﹤0.01% |
4,000
-4,600
| -53% | -$158K |
|
5396
CNA Financial
CNA
$14.2B
| $137K | ﹤0.01% |
2,955
+2,855
| +2,855% | +$132K |
|
5397
CALL
ONE Gas
OGS
$4.87B
| $137K | ﹤0.01% |
+1,700
| New | +$127K |
|
5398
CALL
Phillips Edison & Co
PECO
$5.46B
| $137K | ﹤0.01% |
4,000
+3,700
| +1,233% | +$128K |
|
5399
PUT
Steven Madden
SHOO
$3.37B
| $137K | ﹤0.01% |
4,100
-3,800
| -48% | -$107K |
|
5400
ArriVent BioPharma
AVBP
$1.39B
| $137K | ﹤0.01% |
7,454
+7,409
| +16,464% | +$146K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.