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 | |
|---|---|---|---|---|---|---|
4951
CALL
Ameriprise Financial
AMP
$48.1B
| $196K | ﹤0.01% |
400
-1,100
| -73% | -$564K |
|
4952
CALL
Brown & Brown
BRO
$23.7B
| $196K | ﹤0.01% |
2,100
+1,100
| +110% | +$107K |
|
4953
Eastman Chemical
EMN
$8.01B
| $196K | ﹤0.01% |
3,124
-18,984
| -86% | -$1.33M |
|
4954
CALL
Macerich
MAC
$7.22B
| $196K | ﹤0.01% |
10,800
-4,900
| -31% | -$84.9K |
|
4955
PUT
MakeMyTrip
MMYT
$5.37B
| $196K | ﹤0.01% |
2,100
+900
| +75% | +$87.5K |
|
4956
PUT
PepGen
PEPG
$123M
| $196K | ﹤0.01% |
+42,600
| New | +$68.7K |
|
4957
PUT
Ring Energy
REI
$315M
| $196K | ﹤0.01% |
180,700
+174,800
| +2,963% | +$158K |
|
|
SUPV
4958
PUT
Grupo Supervielle
SUPV
$880M
| $196K | ﹤0.01% |
39,700
-18,400
| -32% | -$160K |
|
4959
PUT
Expro Ltd
XPRO
$1.71B
| $196K | ﹤0.01% |
16,500
+16,000
| +3,200% | +$174K |
|
4960
Roundhill Daily 2X Long Magnificent Seven ETF
MAGX
$50.7M
| $196K | ﹤0.01% |
3,479
-161
| -4% | -$7.83K |
|
4961
CALL
Alkermes
ALKS
$8.39B
| $195K | ﹤0.01% |
6,500
+5,600
| +622% | +$158K |
|
|
AVDX
4962
CALL
DELISTED
AvidXchange
AVDX
| $195K | ﹤0.01% |
19,600
+19,300
| +6,433% | +$191K |
|
|
BLD
4963
PUT
DELISTED
TopBuild
BLD
| $195K | ﹤0.01% |
500
-400
| -44% | -$160K |
|
4964
PUT
The Joint Corp
JYNT
$119M
| $195K | ﹤0.01% |
20,500
+2,300
| +13% | +$24.9K |
|
4965
PUT
Enviri
NVRI
$624M
| $195K | ﹤0.01% |
15,400
-22,700
| -60% | -$235K |
|
4966
CALL
Sanmina
SANM
$9.83B
| $195K | ﹤0.01% |
1,700
-72,600
| -98% | -$8.16M |
|
4967
PUT
abrdn Physical Gold Shares ETF
SGOL
$7.01B
| $195K | ﹤0.01% |
5,300
-8,900
| -63% | -$294K |
|
4968
PUT
Atkore
ATKR
$2.4B
| $194K | ﹤0.01% |
3,100
-2,100
| -40% | -$137K |
|
4969
PUT
Avient
AVNT
$3.36B
| $194K | ﹤0.01% |
+5,900
| New | +$205K |
|
|
DEA
4970
PUT
Easterly Government Properties
DEA
$1.15B
| $194K | ﹤0.01% |
8,500
+4,500
| +113% | +$102K |
|
|
FINV
4971
FinVolution Group
FINV
$1.15B
| $194K | ﹤0.01% |
+26,421
| New | +$232K |
|
4972
PUT
Krystal Biotech
KRYS
$10.8B
| $194K | ﹤0.01% |
1,100
-400
| -27% | -$59.9K |
|
4973
Payoneer
PAYO
$2.42B
| $194K | ﹤0.01% |
32,117
+32,051
| +48,562% | +$215K |
|
4974
Vanguard Total International Stock ETF
VXUS
$155B
| $194K | ﹤0.01% |
+2,654
| New | +$188K |
|
|
ZENA
4975
PUT
ZenaTech Inc
ZENA
$116M
| $194K | ﹤0.01% |
40,600
-24,500
| -38% | -$122K |
|
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.