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 | |
|---|---|---|---|---|---|---|
5351
Nutrien
NTR
$33.2B
| $142K | ﹤0.01% |
2,431
-33,258
| -93% | -$1.94M |
|
5352
Prospect Capital
PSEC
$1.07B
| $142K | ﹤0.01% |
+51,642
| New | +$154K |
|
5353
CALL
The Bancorp
TBBK
$2.79B
| $142K | ﹤0.01% |
1,900
+1,800
| +1,800% | +$125K |
|
|
CAI
5354
CALL
Caris Life Sciences
CAI
$4.43B
| $142K | ﹤0.01% |
4,700
+3,700
| +370% | +$118K |
|
5355
PUT
Albertsons Companies
ACI
$5.62B
| $141K | ﹤0.01% |
8,100
-82,000
| -91% | -$1.61M |
|
5356
Ameresco
AMRC
$1.12B
| $141K | ﹤0.01% |
+4,209
| New | +$96.3K |
|
5357
Credicorp
BAP
$31.8B
| $141K | ﹤0.01% |
532
+449
| +541% | +$111K |
|
5358
CACI
CACI
$11B
| $141K | ﹤0.01% |
+284
| New | +$137K |
|
5359
PUT
Hyatt Hotels
H
$16.4B
| $141K | ﹤0.01% |
1,000
-20,600
| -95% | -$2.95M |
|
|
TIC
5360
PUT
TIC Solutions Inc
TIC
$1.62B
| $141K | ﹤0.01% |
+10,600
| New | +$121K |
|
5361
PUT
Dorman Products
DORM
$3.98B
| $140K | ﹤0.01% |
+900
| New | +$129K |
|
5362
PUT
iShares S&P GSCI Commodity-Indexed Trust
GSG
$998M
| $140K | ﹤0.01% |
6,100
+6,000
| +6,000% | +$136K |
|
5363
Intapp
INTA
$2.52B
| $140K | ﹤0.01% |
3,441
+107
| +3% | +$4.63K |
|
5364
iShares MSCI Saudi Arabia ETF
KSA
$623M
| $140K | ﹤0.01% |
3,466
+3,303
| +2,026% | +$126K |
|
5365
PUT
LKQ Corp
LKQ
$5.68B
| $140K | ﹤0.01% |
4,600
-2,200
| -32% | -$72.3K |
|
5366
Comstock
LODE
$208M
| $140K | ﹤0.01% |
41,002
+24,347
| +146% | +$75.9K |
|
5367
CALL
N-able
NABL
$882M
| $140K | ﹤0.01% |
18,000
| – | – |
|
5368
Phreesia
PHR
$663M
| $140K | ﹤0.01% |
5,957
+3,082
| +107% | +$83.8K |
|
5369
PUT
Children's Place
PLCE
$54.3M
| $140K | ﹤0.01% |
22,700
-32,400
| -59% | -$176K |
|
|
PPIH
5370
CALL
Perma-Pipe International
PPIH
$196M
| $140K | ﹤0.01% |
6,000
-500
| -8% | -$12.9K |
|
|
PRO
5371
DELISTED
PROS Holdings
PRO
| $140K | ﹤0.01% |
6,113
-5,367
| -47% | -$87.3K |
|
5372
PSQ Holdings
PSQH
$13.9M
| $140K | ﹤0.01% |
4,898
+48
| +1% | +$1.46K |
|
5373
PUT
Reliance Steel & Aluminium
RS
$20.7B
| $140K | ﹤0.01% |
500
+100
| +25% | +$30K |
|
5374
PUT
Triple Flag Precious Metals
TFPM
$5.94B
| $140K | ﹤0.01% |
4,800
-3,000
| -38% | -$77.6K |
|
5375
ProShares Nanotechnology ETF
TINY
$21M
| $140K | ﹤0.01% |
+2,773
| New | +$127K |
|
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.