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 | |
|---|---|---|---|---|---|---|
|
JBGS
7251
CALL
JBG SMITH
JBGS
$837M
| $22K | ﹤0.01% |
1,000
| – | – |
|
7252
PUT
LegalZoom.com
LZ
$1.39B
| $22K | ﹤0.01% |
2,200
-100
| -4% | -$997 |
|
7253
PUT
Methode Electronics
MEI
$525M
| $22K | ﹤0.01% |
3,000
-31,800
| -91% | -$237K |
|
7254
PUT
Madison Square Garden
MSGE
$3.65B
| $22K | ﹤0.01% |
+500
| New | +$20.3K |
|
7255
PUT
Enpro
NPO
$6.63B
| $22K | ﹤0.01% |
100
-300
| -75% | -$64.8K |
|
7256
CALL
Insight Enterprises
NSIT
$3.77B
| $22K | ﹤0.01% |
+200
| New | +$26K |
|
|
NVX
7257
CALL
NOVONIX
NVX
$95.7M
| $22K | ﹤0.01% |
17,300
+13,100
| +312% | +$17.1K |
|
|
OCFT
7258
PUT
DELISTED
OneConnect Financial Technology
OCFT
| $22K | ﹤0.01% |
3,000
-20,700
| -87% | -$152K |
|
7259
CALL
OP Bancorp
OPBK
$241M
| $22K | ﹤0.01% |
1,600
+1,400
| +700% | +$19.4K |
|
7260
Invesco High Yield Equity Dividend Achievers ETF
PEY
$1.16B
| $22K | ﹤0.01% |
1,059
-816
| -44% | -$17.2K |
|
|
PROF
7261
Profound Medical
PROF
$263M
| $22K | ﹤0.01% |
4,419
+2,156
| +95% | +$11K |
|
7262
PUT
Prudential
PUK
$36.1B
| $22K | ﹤0.01% |
800
-1,000
| -56% | -$26.2K |
|
7263
PUT
Quanterix
QTRX
$164M
| $22K | ﹤0.01% |
4,200
+2,100
| +100% | +$11.2K |
|
7264
E.W. Scripps
SSP
$282M
| $22K | ﹤0.01% |
9,008
-34,521
| -79% | -$106K |
|
7265
PUT
Timken Company
TKR
$9.72B
| $22K | ﹤0.01% |
300
+200
| +200% | +$15.4K |
|
|
ZIMV
7266
CALL
DELISTED
ZimVie
ZIMV
| $22K | ﹤0.01% |
1,200
+200
| +20% | +$3.38K |
|
|
PAL
7267
CALL
Proficient Auto Logistics
PAL
$195M
| $22K | ﹤0.01% |
+3,300
| New | +$24.3K |
|
|
TXNM
7268
CALL
TXNM Energy Inc
TXNM
$6.43B
| $22K | ﹤0.01% |
400
-1,000
| -71% | -$56.7K |
|
|
DVS
7269
DELISTED
Dolly Varden Silver Corp
DVS
| $22K | ﹤0.01% |
+4,570
| New | +$17.6K |
|
7270
CALL
Acumen Pharmaceuticals
ABOS
$165M
| $21K | ﹤0.01% |
12,800
+5,000
| +64% | +$6.92K |
|
7271
ACI Worldwide
ACIW
$6.1B
| $21K | ﹤0.01% |
+412
| New | +$19.5K |
|
|
ADVM
7272
CALL
DELISTED
Adverum Biotechnologies
ADVM
| $21K | ﹤0.01% |
+4,800
| New | +$14.2K |
|
7273
CALL
Artivion
AORT
$1.31B
| $21K | ﹤0.01% |
500
-1,400
| -74% | -$52.8K |
|
7274
PUT
AdvanSix
ASIX
$551M
| $21K | ﹤0.01% |
1,100
-900
| -45% | -$18.9K |
|
7275
Asure Software
ASUR
$237M
| $21K | ﹤0.01% |
2,680
-1,385
| -34% | -$12.4K |
|
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.