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 | |
|---|---|---|---|---|---|---|
4526
CALL
Trimble
TRMB
$13.6B
| $285K | ﹤0.01% |
3,500
-6,500
| -65% | -$530K |
|
4527
PUT
DXC Technology
DXC
$1.91B
| $284K | ﹤0.01% |
20,900
+13,300
| +175% | +$189K |
|
4528
PUT
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$21.5M
| $283K | ﹤0.01% |
+7,000
| New | +$340K |
|
4529
CALL
Genworth Financial
GNW
$3.86B
| $283K | ﹤0.01% |
31,800
-44,700
| -58% | -$369K |
|
4530
PUT
Highwoods Properties
HIW
$3.79B
| $283K | ﹤0.01% |
8,900
+5,800
| +187% | +$178K |
|
4531
Gartner
IT
$11.1B
| $283K | ﹤0.01% |
1,077
-123
| -10% | -$35.9K |
|
4532
O-I Glass
OI
$1.18B
| $283K | ﹤0.01% |
21,892
+1,142
| +6% | +$15.6K |
|
4533
CALL
Sabesp
SBS
$18.4B
| $283K | ﹤0.01% |
58,784
+43,830
| +293% | +$184K |
|
|
CIVI
4534
DELISTED
Civitas Resources
CIVI
| $282K | ﹤0.01% |
8,685
-89,210
| -91% | -$2.85M |
|
4535
Clean Energy Fuels
CLNE
$416M
| $282K | ﹤0.01% |
109,383
-20,091
| -16% | -$47K |
|
4536
IES Holdings
IESC
$9.89B
| $282K | ﹤0.01% |
711
+66
| +10% | +$22.7K |
|
4537
PUT
Imperial Petroleum
IMPP
$212M
| $282K | ﹤0.01% |
59,000
-1,300
| -2% | -$4.57K |
|
4538
PUT
Ryder
R
$9.9B
| $282K | ﹤0.01% |
1,500
-500
| -25% | -$90.2K |
|
4539
Dole
DOLE
$1.38B
| $281K | ﹤0.01% |
20,967
+19,509
| +1,338% | +$274K |
|
4540
Invesco KBW Bank ETF
KBWB
$6.72B
| $281K | ﹤0.01% |
3,602
-9,492
| -72% | -$715K |
|
4541
Korn Ferry
KFY
$4.31B
| $281K | ﹤0.01% |
4,020
+3,641
| +961% | +$266K |
|
4542
CALL
MINISO
MNSO
$3.88B
| $281K | ﹤0.01% |
12,500
-62,600
| -83% | -$1.34M |
|
4543
iShares MSCI USA Min Vol Factor ETF
USMV
$23.6B
| $281K | ﹤0.01% |
+2,963
| New | +$278K |
|
|
VRNA
4544
DELISTED
Verona Pharma
VRNA
| $281K | ﹤0.01% |
+2,641
| New | +$276K |
|
4545
CALL
Bio-Rad Laboratories Class A
BIO
$8.76B
| $280K | ﹤0.01% |
1,000
-300
| -23% | -$81.6K |
|
4546
CALL
Bausch + Lomb
BLCO
$5.78B
| $280K | ﹤0.01% |
18,600
+1,800
| +11% | +$25.9K |
|
4547
PUT
Cognex
CGNX
$9.62B
| $280K | ﹤0.01% |
6,200
+1,500
| +32% | +$60.7K |
|
4548
CALL
Extreme Networks
EXTR
$3.8B
| $280K | ﹤0.01% |
13,600
-21,600
| -61% | -$429K |
|
4549
Kimco Realty
KIM
$17.5B
| $280K | ﹤0.01% |
12,853
+8,248
| +179% | +$179K |
|
4550
Qfin Holdings
QFIN
$1.68B
| $280K | ﹤0.01% |
9,762
+3,781
| +63% | +$129K |
|
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.