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 | |
|---|---|---|---|---|---|---|
3626
CALL
nCino
NCNO
$2.03B
| $588K | ﹤0.01% |
21,700
+14,500
| +201% | +$424K |
|
3627
CALL
Kimco Realty
KIM
$17.7B
| $587K | ﹤0.01% |
26,900
+16,600
| +161% | +$361K |
|
3628
CALL
Maravai LifeSciences
MRVI
$1.01B
| $587K | ﹤0.01% |
204,600
-36,400
| -15% | -$92.9K |
|
3629
CALL
Prairie Operating Co
PROP
$66.5M
| $587K | ﹤0.01% |
295,800
+67,100
| +29% | +$191K |
|
3630
CALL
ScottsMiracle-Gro
SMG
$4.25B
| $586K | ﹤0.01% |
10,300
-33,600
| -77% | -$2.12M |
|
3631
PUT
TransUnion
TRU
$16.2B
| $586K | ﹤0.01% |
7,000
+6,600
| +1,650% | +$599K |
|
3632
EnerSys
ENS
$6.69B
| $584K | ﹤0.01% |
+5,178
| New | +$509K |
|
3633
CALL
Talos Energy
TALO
$2.28B
| $584K | ﹤0.01% |
60,900
+19,900
| +49% | +$179K |
|
|
EXE
3634
Expand Energy Corp
EXE
$21.2B
| $583K | ﹤0.01% |
+5,488
| New | +$551K |
|
3635
PUT
Agios Pharmaceuticals
AGIO
$2.14B
| $582K | ﹤0.01% |
14,500
+14,300
| +7,150% | +$538K |
|
|
BNCWW
3636
CALL
CEA Industries Inc Warrant
BNCWW
$51.9K
| $581K | ﹤0.01% |
+74,500
| New | +$11.2K |
|
3637
First Trust NASDAQ Cybersecurity ETF
CIBR
$14B
| $581K | ﹤0.01% |
7,645
+3,726
| +95% | +$275K |
|
|
KYIV
3638
CALL
Kyivstar Group
KYIV
$3.13B
| $581K | ﹤0.01% |
+46,500
| New | +$552K |
|
3639
CALL
Jack Henry & Associates
JKHY
$11.2B
| $580K | ﹤0.01% |
3,900
-5,200
| -57% | -$863K |
|
3640
CALL
Sabre
SABR
$743M
| $579K | ﹤0.01% |
316,700
+10,500
| +3% | +$24.8K |
|
|
VTLE
3641
DELISTED
Vital Energy
VTLE
| $579K | ﹤0.01% |
+34,331
| New | +$580K |
|
|
SY
3642
PUT
So-Young International
SY
$197M
| $578K | ﹤0.01% |
+149,400
| New | +$635K |
|
3643
CALL
Ollie's Bargain Outlet
OLLI
$4.17B
| $577K | ﹤0.01% |
4,500
-1,900
| -30% | -$252K |
|
3644
Trevi Therapeutics
TRVI
$2.62B
| $577K | ﹤0.01% |
+63,149
| New | +$474K |
|
|
SUIG
3645
CALL
Sui Group Holdings
SUIG
$73M
| $576K | ﹤0.01% |
+149,300
| New | +$674K |
|
|
ABTC
3646
PUT
American Bitcoin Corp
ABTC
$400M
| $576K | ﹤0.01% |
+5,700
| New | +$571K |
|
|
HUYA
3647
CALL
Huya Inc
HUYA
$561M
| $575K | ﹤0.01% |
172,800
+149,700
| +648% | +$492K |
|
3648
CALL
Lamar Advertising Co
LAMR
$16.5B
| $575K | ﹤0.01% |
4,700
+4,000
| +571% | +$497K |
|
3649
PUT
Mistras Group
MG
$490M
| $575K | ﹤0.01% |
58,500
-155,900
| -73% | -$1.39M |
|
3650
CALL
Janus International
JBI
$732M
| $574K | ﹤0.01% |
58,200
+56,300
| +2,963% | +$543K |
|
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.